User`s Manual OIL/WATER SEPARATORS
Contents
1. 3u9A jueuudinbe 5 5 3ueuudinboe UMOUS uondo 55920 73 O LH IPPON Ao www highlandtank com 25 Oil Level Leak Alarms For easy efficient operation and maintenance the OWS may be Optional equipped with an Oil Water Interface and Level Sensor and or Leak Detection Sensor to activate warning alarms at high oil levels or in the event of a leak Oil accumulates in the OWS until a predetermined level is reached at which time the oil level sensor activates an alarm signaling that the OWS is full of oil The level sensor is a magnetic float switch type for oil water interface detection The interstitial soace of a double wall OWS can be monitored for a leak of either water or hydrocarbons by liquid only or product specific sensors Highland Tank offers a wide range of control panels and sensors to monitor the operation of your OWS All panels include audible visual signals to alert the operator of system changes and system test buttons Highland Tank s typical standard panels are listed here for quick reference HTAP 1 Single channel panel Performs High Oil Level sensing OR for Liquid Only Leak Detection with non specific alarm 2 Two channel panel Performs High Oil Level AND High High Oil Level sensing OR H2. SSS 34 www highlandtank com Sludge Removal Determine exactly where the sludge water interface is located using Procedures a sampling device or a gauge stick Open the 4 inch diameter Gauge Port or Chamber Manway If used insert gauge stick into the OWS through the 4 inch diameter Gauge Port or Manway Alternately a sampling device enables taking accurate readings on settled solids to any depth in the OWS Slowly lower the gauge stick until it comes into contact with the sludge blanket Mark the stick Push the stick downward until it comes into contact with the Striker Plate on the OWS bottom Mark the stick The sludge depth is the difference between the two measurements Sludge Removal Place a 3 inch diameter or smaller suction hose inside the OWS Procedures through either the 4 inch diameter Gauge Port or through for full OWS the Manway Lower hose to exact sludge water interface location Using suction remove the sludge while slowly lowering the suction hose nozzle until it comes into contact with the Striker Plate on the OWS bottom Refill with clean water see Start Up Instructions page 21 Sludge Removal Procedures for completely empty OWS WARNING Never enter an OWS or enclosed space under any condition without proper training and OSHA approved equipment Consult OSHA Regulations for Permit Required Confined Spaces 29 C F R S 1910 146 Using suction remove the sludge an
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5. High Oil and High High Oil Specific High Oil High High Oil and Leak Detection Specific Non discriminating ALARM HORN ALARM HORN GD 85 HIGH HIGH OIL HIGH OIL HIGH HIGH OIL ALARM TEST ALARM SILENCE aay I sax T gel md c eee Fa eee _ __ __ www highlandtank com 27 Oil Level Controls Optional continued Panel Light or Button NORMAL LIGHT White TEST ALARM HORN SILENCE ALARM 1 HT A2 LDFW 4 Channel High Oil High High Oil and discriminating Fuel WaterLeak Detection ALARM HORN HIGH HIGH OIL GD 5 FUEL LEAK WATER LEAK HIGH OIL FUEL LEAK TEST WATER LEAK TEST ALARM TEST ALARM SILENCE Below is a listing of Highland Tank s control panel features Refer to the previous diagrams to help understand the function of your particular panel Description Function Indicates that system is active in normal operating non alarm mode Temporarily closes the control panel circuits to provide a system test Works in conjunction with yellow alarm lights Emits audible 90 95 decibel sound alerting operator that system has entered an alarm mode Silences the audible alarm temporarily for operator to perform service Does not cancel alarm mode Alerts operator of High Oil level Oil has reached a predetermined level and must be pumped out soon RESPONSE Stop OWS operation Pump out oil Refill OWS with water to reset sensors Resume OWS operation OR Leak Detectio
6. alarm should activate Move the top float up and down on the probe stem As the top float approaches the lower grip ring the High Oil Level warning alarm light and audible alarm should activate Note If one or both alarms do not activate properly check the panel and sensor wiring for proper connections and continuity After Oil Level Sensor As installed OWS fills with water both floats will be in low position Installation dry condition and both alarms will be activated Note If alarms are not activated check the wiring connections While the OWS is filling with water the High High Oil Level Warning Alarm should deactivate and soon thereafter the High Oil Level Warning Alarm should deactivate Note If the alarms do not deactivate upon filling remove the sensor and check for float binding or poor electrical connections Contact Highland Tank 814 893 5701 should you need additional assistance RR 22 www highlandtank com Standard OWS Description amp Operation Operation Highland Tank s OWS is a wastewater treatment tank used to intercept and collect free oil raw petroleum hydrocarbons grease and oily coated solids from a wastewater stream They are typically required in all facilities that conduct washing servicing repairing maintenance or storage of motor vehicles including car washes commercial vehicle garages repair facilities service stations and similar sites where oil or flammable liqui
7. inlet and outlet piping elevations check recheck approval drawing and site plan when OWS arrives Make sure OWS hold down method system is predetermined and components are at the site prior to OWS installation e The amount of debris such as sand gravel dirt leaves wood rags etc permitted to enter the OWS must be minimized for maximum effectiveness Installation of an appropriately sized Collection Catch Basin or other similar device upstream of the OWS is recommended Detergents and solvents must not enter the OWS The OWS will not remove chemical emulsions or dissolved hydrocarbons and their presence retards the recovery of oils that would otherwise be separated Never enter the OWS or any of its enclosed spaces without proper confined space entry training and approved equipment See OSHA Regulations for Permit Required Confined Spaces 29 C F R 1910 146 Barricade the OWS installation area until job is complete SSS 4 www highlandtank com Important points to consider continued Wastewater containing high concentrations of dissolved solids Such as untreated sanitary sewage must be excluded due to its emulsifying tendency Wastewater which exhibits high Biological Oxygen Demand Chemical Oxygen Demand and Total Suspended Solids may require additional treatment after the OWS e The OWS will not remove chemical or physical emulsions dissolved hydrocarbons solvents or Volatile Organic Compounds Installat
8. required for ballasting See page 16 fill with clean fresh water at this time The OWS must be full of water before any wastewater can be treated The OWS can be filled through the facility s drain leading to the OWS inlet or through a manway If filling by manway place the hose through the 4 inch diameter Gauge Port in the inlet side Manway Cover or in the 24 inch diameter Manway so that hose outlet rests inside the OWS The OWS is full when water drains out of the Outlet Check the water level using a gauge stick The level on the gauge stick must equal the invert of the Outlet Pipe as measured from the OWS bottom To ensure that no blockage exists allow water to flow through the facility drain which leads to the OWS Inlet Check the Outlet Pipe to make sure that water is flowing through the OWS Check the Inlet Pipe and facility s drain for water backup p a 1 1 www highlandtank com e 21 OWS Start Up continued Prior to Oil Level Sensor Installation Oil Level Controls optional Check sensor with a continuity meter Both switches are normally closed in a low position dry condition And Or Connect the sensor to proper panel wiring Refer to specific panel wiring diagram supplied Switch on the panel Move the bottom float up and down on the probe stem As the bottom float approaches the lower grip ring the High High Oil Level Warning Alarm light and audible
9. spill that exceeds the normal oil storage capacity of the OWS In the event of a major spill notify proper authorities as required by federal state and local laws After a major oil spill the OWS should always be emptied cleaned and refilled with clean water Oil Spill Removal lf OWS has optional oil level controls confirm that the High and Procedures with or High High Oil Level Alarms are activated due to an actual without optional oil High High oil condition level controls Determine exactly where the oil water interface is located using a sampling device or a gauge stick with water finding paste Open the 4 inch diameter Gauge Port or Sediment Chamber Manway Place sampling device or gauge stick into the OWS through the 4 inch diameter Gauge Port or Manway to determine the oil water interface location Place a 3 inch diameter or smaller suction hose inside the OWS through either the 4 inch diameter Gauge Port or through the Manway Lower hose to exact oil water interface location If the suction hose nozzle extends lower than the oil water interface water may be inadvertently removed with the oil Using suction remove the oil Refill with clean water see Start Up instructions page 21 If oil is still visible on the surface of the OWS or the alarms remain on suction out the oil and refill with clean water Continue this sequence until only sheen of oil is visible on the surface of the OWS or the alarms deactivate
10. the primary tank only If a hydrostatic test is required follow the procedure as described above A double wall OWS shipped with a vacuum on the interstice need not be retested provided the OWS arrives at the installation site with the vacuum level within limits designated by Highland Tank If the OWS did not ship with a vacuum on the interstice or vacuum has decayed proceed with the air test as described for Fig 4 on page 10 Consult Highland Tank if OWS does not hold vacuum For Series G and J OWSs it is recommended that the hydrostatic test be performed on each separate chamber to ensure there are no leaks between chambers www highlandtank com 11 Excavation and Bedding The excavation should provide adequate space for the OWS s piping and associated equipment It must also be free of any hard or sharp material that could cause damage to OWS coating Be certain that foreign matter is not introduced into the excavation or backfill The total depth of the excavation is determined by the OWSs diameter bedding thickness hold down pad if required depth of cover including any effects of vehicular traffic and slope and length of piping Consult AHJ for additional requirements related to existing structures CAUTION DO NOT exceed maximum burial depth determined by engineer of record Bedding and backfill must be a homogeneous material consisting of compacted clean sand pea gravel No 8 crushed stone American Society
11. DO NOT connect a high pressure air supply line directly to the interstitial monitoring port A double wall OWS shipped with a vacuum on the interstice need not be subjected to an air soap test if approved by AHJ and provided the OWS arrives at the installation site with the vacuum level within designated limits If the vacuum level has changed significantly reinstitute the vacuum to 7 inches of mercury Maintain 5 inches of mercury vacuum for 2 hours Consult Highland Tank if OWS does not hold vacuum If the OWS did not ship with a vacuum on the interstice or requires testing proceed with the air test as follows and as illustrated in Fig 4 below Temporarily plug cap or seal off remaining OWS openings to hold pressure Close valve B and pressurize the OWS inner tank to a maximum of 5 PSIG Seal the inner tank by closing valve A and disconnect the external air supply Monitor the pressure for a period of 1 hour While air tests are generally inconclusive without soaping and the careful inspection for bubbles this step is recommended to detect a very large leak in the inner tank and prepare for the next step Fig 4 Flexible Valve B Connection Gauge 1 Overpressure Relief Device Set at 5 PSIG H Valve A i Air Supply Inner Wall Leak Detection Monitoring Pipe 10 www highlandtank com Optional Hydrostatic Test for Single Wall OWS if Required by AHJ Optional Hydrostatic Test for Dou
12. OIL WATER SEPARATORS Underground HT HTC UL SU2215 J User S Manual Single wall amp Double wall Series G amp J Models with EZ Access Option gt o gt j m 20 gt m o lt o m o Installation Operation Maintenance Carefully read and follow the instructions in this manual Unmatched Quality amp Service Proudly made in America Warning and Disclaimer This manual is intended for use only by persons knowledgeable and experienced in underground oil water separator installation operation and maintenance This manual provides general guidance and conditions at your site may render inapplicable some or all of the guidance If you are uncertain or require clarification or further instruction please contact Highland Tank prior to commencing any installation operation or maintenance procedure You are solely responsible for compliance with all federal state and local laws regulations and ordinances applicable to your installation and operation Highland Tank disclaims all liability related to any misuse of the oil water separator or failure to follow all guidance and Instruction provided by Highland Tank SSS 2 www highlandtank com Contents Introduction Installation 6 Piping amp Venting 17 Start up 21 Operation 23 Maintenance 31 Troubleshooting Guide 39 OWS Reference Drawing 41 Appendix Sample Inspection and Maintenance Log Thank y
13. S with clean water See Start Up Instructions page 21 OWSs without oil level sensors require level checking by use of a sampling device or a gauge stick with water finding paste The OWS must be checked at regular intervals to monitor oil levels When the oil water interface level surpasses the high oil level or 20 of the OWS s working volume oil should be removed and the OWS refilled with clean water At the 4396 or high high oil level OWS performance will decline Oil must be removed and the OWS refilled with clean water Use a gauge stick and water finding paste to check the oil water interface level Step 1 Measure and record the distance from the fluid surface to the bottom of the OWS Step 2 Measure and record the thicknesses of the oil top and solids bottom layers Step 3 Add thickness measurements of the oil and solids layers then divide this number by the distance from fluid surface to bottom of OWS from Step 1 to obtain the accumulated wastes volume percentage If the combined oil and solids layers are equal to or greater than 2096 the separator is considered full Stop OWS operation remove accumulated oils and solids Refill the OWS with clean fresh water and resume operation see Start Up Instructions page 21 If this calculation is less than 2096 reduce pump out frequency If greater than 2096 increase pump out frequency WARNING If the oil is not pumped out the oil concentration in effluent may exc
14. WS without following proper confined space entry procedures www highlandtank com 7 Coating Repair Fig 2 continued As part of Highland Tank s quality control program all OWS receive a holiday detection test at the factory to ensure coatings are uniform and without holidays After repairs have been completed all repaired areas of the HighGuard and ACT 100 U protection system coatings shall be re tested with a holiday detector set at 15 000 volts Anode Integrity DO NOT perform 15 000 volt holiday test on sti P3 protected sti P only OWSs Refer to Steel Tank Institute sti P49 Installation Instructions R821 for more information OWS may be equipped with zinc magnesium or a combination of both anodes Consult sti P49 Corrosion Control System R821 and Petroleum Equipment Institute PEI RP100 for further instructions for checking operation repairing connection and activating SSS 8 www highlandtank com Pre installation Tightness appropriate air or hydrostatic test must be performed prior to Testing Procedures placing OWS into service as outlined below Factory applied vacuum test may be substituted for on site testing Check with AHJ for approval Take all necessary safety precautions during air tests IMPORTANT DO NOT leave OWS unattended DO NOT apply a vacuum to a single wall OWS or to the primary tank of a double wall OWS DO NOT connect the air pressure line from the compressor to the in
15. accumulated waste with a suction hose see Sludge Removal procedures page 35 Direct a high pressure hose downward to loosen any caked oily solids on OWS sides and bottom NOTE Use of high temperature high pressure washing equipment along with Highland Cleaner Plus can be helpful in OWS cleaning Highland Cleaner Plus is a very effective degreaser This easy to use cleaner is 100 biodegradable non emulsifying and has low toxicity It offers the user effective non hazardous cleaning power for use in the most sensitive environmental situations Attach spray nozzle wand extension to the high pressure hose Direct soray downward and toward the velocity head diffusion baffle to loosen any caked oily solids that may have accumulated on inlet head Direct the spray to the OWS wall sides top and bottom Using suction remove the resultant slurry 36 www highlandtank com Cleaning OWS Coalscers Corella Coalescer Disconnect all Oil Level Sensor wiring Carefully remove the Oil Level Sensor Carefully check the Oil Level Sensor floats If the floats do not slide easily on the stem or have sludge on them clean the Oil Level Sensor Use a parts washer and mineral spirits to remove accumulated oil grease or sludge Check the Oil Level Sensor with a continuity meter to assure proper operation Place the Oil Level Sensor in a safe area to prevent damage Remove manway covers over the manways to expose the OWS ch
16. ambers Be careful not to damage the gasket Gauge the level of sand dirt or debris with a sampling device or gauge stick Never enter an OWS or enclosed space under any condition without proper training and OSHA approved equipment See OSHA Regulations for Permit Required Confined Spaces 29 C F R 1910 146 Remove the accumulated waste with a suction hose see Sludge Removal Procedures page 35 Direct a high pressure hose downward and around to loosen caked oily solids on OWS sides top and bottom Attach spray nozzle wand extension to the high pressure hose Direct spray downward and toward the Corella coalescer to loosen caked oily solids that may have accumulated on the plates Flush the Corella coalescer from the outlet side to direct debris into sediment chamber The coalescer packs must be cleared of all sludge to operate properly Direct the spray to the OWS wall sides top and bottom Rotate the nozzle sufficiently and often so that all areas are reached with the spray Using suction remove the slurry from all chambers Visually inspect the OWS interior and components for any damage NOTE If any visual damage exists contact Highland Tank for further instructions www highlandtank com 37 Petro Screen Coalescer Coalescer packs can be removed through the manways for IMPORTANT cleaning Mechanical lifting equipment may be required to remove oil filled packs and coalescer packs in larger units Note Th
17. an oil skimmer is to be installed piping between the OWS and the Skimmers and or waste oil tank must be sloped between 1 8 inch to 1 4 inch per foot Monitoring Equipment to maintain gravity flow For OWS with oil level sensors pump out pipes and leak detection sensors install riser pipes using compatible non hardening sealant taking care not to cross thread or damage the nonmetallic bushings Torque of 400 to 1 000 foot pounds may be required to fully insert pipe For electrical wiring details please refer to the sensor and control panel installation instructions MERGE c m 18 www highlandtank com Final Air Test An additional air test may be required after OWS is secured and backfilled to the top of the OWS Air pressure for air testing after installation must not exceed 5 PSIG and must be measured at the top of the OWS Refer to appropriate air tests procedure on pages 9 and 10 Sealing of Lifting Lugs During the installation process steel can become exposed at the and Pipe Connections lifting lug due to the handling of the OWS These areas along with all other exposed steel surfaces must be covered using the coating kit supplied by the manufacturer Apply supplied coating touch up to all exposed steel surfaces of the OWS and allow to cure completely After an air test has established tightness apply coating to the OWS fittings and allow to cure prior to backfill Coating must inclu
18. and ropes e Horns whistles radios etc for communication purposes e Explosion proof lighting Be sure to inspect and replace manway gaskets as necessary adis ee when the OWS is shut down for maintenance The coalescer plates and packs can be mechanically removed through the EZ Access manways if present for cleaning or can be cleaned from above using a high pressure hot water system Inlet and effluent pipe valves should be closed and locked for safety prior to OWS entry All liquid must be removed from the OWS prior to entry Any and all oil recovered and removed from the OWS should be recycled or disposed of in accordance with federal state and local codes and regulations CAUTION Interior surfaces of the OWS will be slippery OWSs are designed for long term trouble free operation The following maintenance should be performed as needed or in accordance with a facility maintenance schedule Periodic inspection of e Upstream trench drains sand interceptors and traps Inside of the OWS for sand trash sludge and oil build up e Effluent for oils and other contaminants in accordance with local codes and permits e Oil level in accordance with local codes and permits p i 4 www highlandtank com e 31 Maintenance OWSs with oil level sensors require oil removal when the alarm is continued activated Stop OWS operation remove the oil and then refill OW
19. asy solids accumulate in the OWS until they are pumped out Any and all oil recovered and removed from the OWS must be recycled or disposed of in accordance with federal state and local regulations Optional Petro Screen Most OWS models are equipped with an optional Petro Screen Coalescer coalescer The Petro Screen coalescer intercepts oil droplets too minute to be removed by the Corella Coalescer This bundle of oil attracting polypropylene fibers traps oil particles down to 20 microns in size These small particles coalesce into larger globules that eventually break free and rise to the surface DECRE RR m s A 24 www highlandtank com peyebnuo 219105 5 ooepioju J91e WVIIO JO sJououy josueg uonoejeg xe91 eonsijupxuep y Wn SO 1enno ooeld OOdS uonejos LATLNO Buldig 13epnno pebue J Za sfewuewN __ edid BuuojuoJ A DButdig 1u9A 1enno E JO 294 ooeld 0086 uonejos xxDUICI 1914
20. ble Wall OWS if Required by AHJ IMPORTANT Pressurize the interstice with air from the inner tank by closing valve C then opening valve B Allow pressure to equalize ooap the exterior of the OWS and inspect for bubbles while continuing to monitor the gauges to detect any pressure drop Helease the pressure from the interstice first by opening valve C then open valves A and B to release all test pressure and vent both spaces Hefer to PEI RP100 and labels on the OWS for testing guidelines An on site hydrostatic test of the single wall OWS may be required by the AHJ before installation to ensure no damage has occurred during shipping and handling After the separator has been leveled secured to foundation and the OWS is fully supported with backfill around the bottom quadrant fill the OWS with clean fresh water See Filling the OWS on page 21 until water is discharged from the outlet Allow the OWS to stabilize to a no flow static condition If required by AHJ attach blind flanges to inlet outlet and fill completely Accurately measure and record the fluid level from the top of the manway to the static fluid level After one hour verify that the fluid level has not dropped A fluid level change would indicate that there may be a leak in the primary tank If a leak is detected contact Highland Tank before proceeding For double wall OWS vacuum testing of the interstitial space can be used instead of a hydrostatic test on
21. d debris Use caution to avoid internal coating damage Using a standard garden hose at normal pressure 40 70 PSIG with or without a spray nozzle loosen any caked oily solids Use of hot water can be helpful Direct the water stream to the OWS wall side and bottom Using suction remove the resultant slurry p x E S www highlandtank com e 35 General OWS If not properly maintained the OWS may malfunction Cleaning Procedures NOTE Over a period of time sediment oil and grease will build up on the walls and floors of the OWS Dirt and heavy oil may also build up on the Corella coalescer reducing the unit s efficiency In addition the petro screen removes some suspended solids along with the small oil droplets in the wastewater Periodic cleaning of the petro screen is also required IMPORTANT It is recommended that the OWS be cleaned as needed or at least once a year Keep inspection and maintenance logs and have them available for ready reference Sediment Chamber Remove manway covers to expose the sediment chamber being careful not to damage the gasket Pump out liquid contents of OWS see Mixed Oil and Water Removal Procedures page 33 Gauge the level of sand dirt or debris with a sampling device or gauge stick IMPORTANT The level of sand dirt or debris should not be allowed to accumulate higher than 12 from the bottom of the OWS Remove the
22. de Interface level sensor Leak sensor for interstitial monitoring of double wall OWS Control panels Optional OWS electronics must be installed after OWS has been installed and before start up procedures are initiated For OWS electronics installation details please refer to the installation instructions 20 www highlandtank com OWS Start Up IMPORTANT The OWS must be full of water to operate CAUTION Separated liquid oil and vapors are flammable and or combustible Service personnel must comply with all established OSHA reg ulations governing the facility and services These include but are not limited to the use of approved breathing equipment protective clothing safety equipment and other requirements The final state of all wiring must comply with all applicable electrical and fire code standards This system must be properly vented by installer in accordance with applicable plumbing and safety codes for venting of combustible gases All electrical equipment connections and wiring must be protected from submergence and infiltration of water Intrinsically safe sensor wiring must be kept in a separate conduit from non intrinsically safe power wiring Run non intrinsically safe power wiring in conduit grounded at the panel end only and per applicable electrical code Filling the OWS Open the OWS inlet and outlet pipe valves If the OWS has not yet been filled with water as may have been
23. de the entire plug on unused fittings After all coating touch up applications the installer must verify that all of the coating has cured adequate material hardness and solidification prior to final backfill that will completely cover the OWS Cure time will vary depending on temperature and conditions Contact Highland Tank if additional touch up coating is needed www highlandtank com 19 Final Backfilling Deposit homogeneous backfill carefully around OWS to a depth of at least one foot over OWS to avoid damage to coating especially where tamping is required Refer to the National Fire Protection Association s Regulation NFPA 30 and state or local codes for minimum depth of cover required Finally carefully deposit backfill over the OWS up to the elevation needed to complete grade level finishing See Fig 12 for minimum burial depth Consult approval drawing for maximum burial depth Use grade level covers and street boxes to access the manways sensors or pump out pipes The grade level covers above the access manways must be of a greater diameter i e 36 inch grade level cover over a 24 inch access manway Fig 12 Minimum Depth of Cover Minimum Depth of Cover in Areas Subject to Traffic in Areas Not Subject to Traffic 36 30 18 12 12 24 Unpaved 6 Asphalt Reinforced 4 Reinforced Unpaved Concrete 6 Asphalt mr Top of OWS Special OWS Electronics Recommended Optional OWS Electronics inclu
24. ds may be introduced into a sewer system Designed to accept gravity flow the OWS s volume retention time and use of coalescing elements permit these contaminants to separate from the water due to their differences in specific gravity The standard OWS contains two chambers where oils separate and float to the surface while sand and grit settle to the bottom sludge baffle These free floating oils and oily coated solids accumulate in the OWS until they are pumped out The clearer water beneath the separated wastes flows downward to the downcomer pipe where it is discharged from the final OWS OWS sizing and construction conforms to most plumbing codes and the effluent discharge meets or exceeds many municipal industrial sewer pretreatment regulations Nonetheless you must confirm all code and regulatory requirements with your AHJ prior to and during installation of the OWS To view an animated simulation of the OWS operation go to www highlandtank com The OWS is a stationary wastewater treatment tank filled with water Internal baffles and chambers enhance the oil water separation process Waste accumulates within the OWS while effluent is discharged by gravity During operation the wastewater flows into the OWS through the inlet pipe and is directed over the Velocity Head Diffusion Baffle a reinforced steel plate inclined at a 45 degree angle The Velocity Head Diffusion Baffle dissipates the velocity and turbulence of the
25. e coalescer packs should be placed in a convenient location upstream of the OWS Place coalescer packs on oil absorbent blanket or sheet plastic for cleaning Hook a lifting rod or other device to the lifting lug on the coalescer pack directly below the manway and lift straight up to remove it from the OWS Use lifting rod or other device to slide an adjacent pack into position below the manway for removal Continue process until all packs have been removed Using a standard garden hose at normal pressure 40 70 PSIG with or without a spray nozzle to loosen any caked solids Flush the coalescer packs from both sides Let coalescer packs stand to dry Visually inspect the OWS interior and components for any damage NOTE If any visual damage exists contact Highland Tank for further instructions Reinstall the coalescer packs restoring them to their original locations Coalescer packs must be installed sitting on top of the bottom steel channel supports NOTE Improper installation may result in separator malfunction Reattach the manway cover Ensure the gasket is damage free Reinstall the Oil Level Sensor in the 2 diameter Interface and Level sensor Pipe Reconnect all non voltage carrying sensor lines to the Oil Level Sensor Refer to OWS Start Up Instructions on page 21 for proper refilling and restarting procedures pul eS 38 www highlandtank com Troubleshooting Guide Problem Excessive oil concentrated in OWS e
26. eed the desired levels If contaminants are found close the valve on the inlet line determine what the requirements are for restoring working order and take appropriate action For optimum performance maintenance is required once per year or when e the OWS is in alarm condition e the oil layer and or the solids layer in the first chamber are 2096 or greater than the depth of the OWS diameter e the effluent exhibits an oil sheen or contains high contaminant levels Inspect OWS after a heavy rainfall to check for signs of malfunction due to an excessive flow rate NERA RR c 32 www highlandtank com Maintenance If the OWS has been cleaned within the year and only bottom sludge continued has built up while the effluent water is contaminant free it may be sufficient to vacuum the sludge from the sediment chamber and refill OWS with clean water See Start Up Instructions page 21 Oil Removal Procedures IMPORTANT Oil should only be removed during non flow conditions Note The procedures outlined here are guidelines Pure oil water or sludge draw off will depend on conditions and operator control Oil Removal Procedures Confirm that the High Oil Level Warning Alarm is due to an actual with optional oil level high oil level in the OWS otherwise a mixture of oil and water will controls be removed Oil levels can be verified using a sampling device or a gauge stick with water fi
27. ervice purposes Attach manway extensions riser and sensor pipes and any other contractor supplied piping to the OWS Take special care to prevent damage to any gaskets or pipe threads OWS is designed for operation at atmospheric pressure ONLY OWS inlet outlet and manways MUST be vented to atmosphere to assure proper operation See Fig 11 As shown the manway vents can be manifolded together to one common vent line The inlet and outlet vents must each have their own separate dedicated vent line for the following reasons OWS inlet is vented to prevent hazardous gases from building up in inlet pipe draining the catch basin or trench drain which may be in a building OWS outlet is vented to prevent siphoning during full flow into a flooded storm sewer or flooded pit OWS manways are vented to prevent hazardous gases from building up in manway risers Venting the inlet manways and outlet independently prevents raw oil or oily wastewater from bypassing and exiting the OWS in the event of a Surge or vapor condensation www highlandtank com 17 Fig 11 Terminate vent piping as required by AHJ Manways Oil Water Separator Inlet LJ Outlet Vent piping requirements may vary by code Check with Terminate all vent piping per local code and Note OWS owners may need to provide flame arrestors where required by governing codes for safety Check with OWS with Gravity Oil If
28. ffluent water Problems which occur during OWS operation can be the result of many factors The following list identifies the most common problems their possible causes and suggested remedies Possible Cause Wastewater pumped into the OWS causing emulsification of oil droplets in the clean water Flow rates exceeding rated capacity causing emulsification of oil droplets in the clean water Presence of detergents or surfactants causing emulsification of oil droplets in the clean water Oil levels higher than rated storage Capacity causing separated oil to carry over Excessive flow turbulence into OWS causing more mechanical emulsions Presence of dissolved hydrocarbons Presence of excessive dissolved or suspended solids leading to OWS inside OWS or in effluent Solids or clay may be coated with oil Oil is of a higher specific gravity than was specified for OWS Wastewater pH is high causing chemical emulsification Remedy Adjust pump change to different pump or change to gravity flow Decrease flow Detect and remove source of harmful detergents Replace with Highland Cleaner Plus Remove oil Check for debris in inlet piping Decrease flow Remove source of hydrocarbon Install Highland Oil Sand Interceptor in front of OWS and clean OWS Remove source of high specific gravity oil or decrease flow rate High pH is usually caused by high alkaline cleaner Change to Highland Cleaner P
29. he surface of the OWS Damage to surface must be repaired using the supplied coating touch up kit Visually inspect the OWS for damage Pay particular attention to areas where coating may have been gouged or abraded Mark all areas which appear damaged for repair Clean damaged OWS coating areas of rust contaminants or disbonded coating prior to application of touch up coating Areas of coating damage shall be roughened up with coarse grit sandpaper or grinder see Society of Protective Coatings SSPC SP 2 Hand Tool Cleaning or SP 3 Power Tool Cleaning for additional guidance to remove all glossiness from the surface surrounding the repair area approximately 6 inches around the damaged area Re coat the area with touch up coating provided see Fig 2 Allow repaired coating areas to cure completely Damaged polyurethane coatings must be repaired with the polyurethane repair kit that was delivered with the OWS Additional coating touch up is available from Highland Tank Carefully remove manway covers so as not to damage the gaskets Inspect the interior of the OWS from above without entry to ensure that internal piping is secure and has not been damaged during transport Do not allow anyone to enter the OWS unless it has been properly prepared for entry and the person entering the OWS has been properly trained for confined space entry per OSHA Regulations for Permit Required Confined Spaces 29 C F R 1910 146 DO NOT ENTER the O
30. igh Oil Level sensing AND for Liquid Only Leak Detection with non specific alarms HT A2 Two channel panel Performs High Oil Level AND High High Oil Level sensing with specific alarms HT A2 LD Three channel panel Performs High Oil Level High High Oil Level sensing AND Liquid Only Leak Detection with specific alarms for oil levels only HT A2 LDFW _ Four channel panel Performs High Oil Level High High Oil Level sensing AND Leak Detection for Fuel or Water with specific alarms for each E ema a c A m 8mUSE EM EME 26 www highlandtank com Oil Level Controls Optional continued lf your OWS has a control panel and sensors installed locate the diagram for your panel from the five selections and then refer to the button light function listing for operation and required action Please consult the job specific project information should you need detailed information regarding a specific alarm control panel Contact Highland Tank if you still need assistance HTAP 1 1 Channel HTAP 2 2 Channel High Oil or Leak Detection High Oil and Leak Detection or High Oil and High High Oil ALARM 1 SILENCE nm d IRSE qena kem _ _ 5 le 1 Uem Ti de IT EE UR nmm euin core T4 Jis HLA era i Lamm HT A2 2 Channel HT A2 LD 3 Channel
31. incoming water redirects the flow downward and toward the OWS head to start serpentine flow process reduces and distributes the flow evenly over the OWS s cross sectional area isolates the inlet turbulence from the rest of the OWS www highlandtank com e 23 Operation continued In the sediment chamber heavy solids settle out and are collected behind the Sludge Baffle Concentrated oil slugs rise immediately to the surface The oily water then passes through the Corella coalescer an arrangement of parallel corrugated flat plates Oil rises and coalesces into sheets on the undersides of the plates The oil migrates up the plate surface breaking free at the top to form large globules of oil that rise quickly to the surface At the same time floating solids are stopped on the flat top surface of the angled plates and slide back off into the sludge collection area During periods of operation and wastewater flow oils and solids continue to accumulate in the OWS As this separation process continues the clearer heavier water migrates toward the bottom of the OWS When wastewater enters the OWS the cleanest water from the bottom of the OWS is discharged via gravity flow Treated water is only discharged from the bottom of the OWS via the downcomer pipe during periods when wastewater flows into the OWS Wastewater flows from the OWS to a sanitary or storm sewer or is pumped to be recycled for reuse Free floating oil and gre
32. ing Material Reinforced Concrete Anchor Contact factory if using more than 12 In tidal areas backfill or bedding materials composed of small particles such as sand can migrate into native soils where larger aggregate such as pea gravel or crushed stone exists Resultant voids can create an uneven support for the OWS The use of filter fabric in tidal areas is recommended to prevent bedding migration SS Saag www highlandtank com 15 Backfilling Ballasting Approved backfill similar to bedding material must be placed around the entire OWS to create a uniform homogeneous environment Be certain that foreign matter is not introduced into the excavation or backfill Special care shall be taken when backfilling to ensure that the OWS is fully and evenly supported around the bottom quadrant and that no damage to the coating occurs See Fig 9 and 10 Fig 9 Remove all large and sharp rocks debris that may Special placement and compaction have fallen into the excavation before backfilling of backfill may be required Fig 10 Remove all large and sharp rocks debris that may have Special placement and compaction fallen into the excavation before backfilling of backfill may be required The backfill should be placed carefully around the OWS to the top of the OWS In areas where there is the presence of ground water or a high water table ballasting may be necessary for additional downward force on the OWS If
33. ins or straps of adequate size When two lifting lugs are used the angle between the lifting cable and vertical shall be no more than 30 degrees See Fig 1 Use a spreader bar where necessary Maneuver OWSs with guidelines attached to each end of the OWS If OWSs must be relocated on a job site during installation they must be lifted and not rolled Fig 1 Max 30 Use spreader bar Max 30 when necessary 6 www highlandtank com Pre Installation Inspection amp Testing Coating Repair Internal Piping Inspection WARNING Upon delivery visually inspect the OWS for exterior damage that may have occurred during shipping or job site handling Any damage that could result in leakage or corrosion must be repaired in a manner approved by Highland Tank Please refer to coating repair instructions below If an OWS is not buried within 90 days the OWS should be covered to protect the exterior coating from the effects of ultraviolet light damage If the OWS is of double wall construction and has shipped with a vacuum drawn on the interstice inspect the vacuum gauge If the gauge indicates less than 5 inches of mercury reinstitute the vacuum to inches of mercury Maintain 5 inches of mercury vacuum for 2 hours before installing the OWS Do not relieve pressure until OWS is secured in its final resting position Before placing the OWS in the excavation all dirt clods and foreign matter shall be cleaned from t
34. ion of an appropriately sized Advanced Hydrocarbon Filtration System brochure 2502 is recommended for treatment of wastewater contaminated with these pollutants e Waste oils such as automobile and truck crank case oil should not be intentionally drained into the OWS Filling the OWS with waste oils adversely affects OWS performance Waste oil should be dumped into a waste holding tank for proper disposal e The OWS needs to be maintained to remain as free of accumulated oil and sediment as possible Suction removal of waste as needed is the best and recommended method of maintenance e The location of your OWS should be in an area with sufficient truck access top side clearance for waste removal e An absence of gravity flow to the OWS will necessitate wastewater pumping Pumping should be restricted to the clean water effluent end of the OWS If pumping occurs at the influent end it will mix the oil and water increasing the emulsified and dissolved oil content and may cause separation failure If a pump is installed upstream of the OWS it must be a positive displacement pump e g progressive cavity diaphragm sliding shoe set at minimum flow rate RPM and installed as far upstream as possible to minimize oil water mixing e Piping should be designed to minimize turbulence and promote laminar flow e The OWS must be kept from freezing at all times The OWS and piping should be installed below local frost levels If necessar
35. lus www highlandtank com 39 Troubleshooting Guide continued Problem Possible Cause Remedy Storm water back up in Excessive sludge or debris build up Clean out OWS drainage area Closed inlet or effluent piping valves Open piping valves completely Inlet piping vapor lock Check to ensure inlet vent is operating properly Debris Clean catch basin trench drains and or OWS High suspended solids Excessive sludge or debris build up Clean out OWS content in clean water effluent Excessive solids in storm water Install Highland drainage area Collection Catch Basin in front of OWS and clean OWS If you have any additional questions regarding OWS problems contact Highland Tank Pme a e c D 5 40 www highlandtank com THAMOVE 8 Jdid DNIGOLINOW H3O0Sd1vOO HOSN3S 13 31 SHOHONV NVIAGQV3G HO Vd HOLOVH LNOO IWNdSLNI N33dO0S Oul3d AOVAYALNI TWNOILdO 31V ld dala ls 3 134va8 ADGNIS 4 NMOQ C10H HOLOVHINOO ov ou OX ee ee ICON oe ae ee na ee Se eee gaye es EXE oT oe ee P 2y 7 as 2 152 2 1912203 lt eas n DANS M ONT l mee 7 NE JL 1HOd 39nv9 NOISN3 LX3 9 313H2NOO ONidid INJA 995 H3AOO AVMNVIN Q39NV 1H HOLOVHLINOO 40 YOLOVELNOO
36. n See Leak Detection System procedure 28 www highlandtank com Oil Level ALARM 2 Alerts operator of High High Oil level Oil has reached a critical Controls predetermined level and must be pumped out immediately Optional RESPONSE Stop OWS operation Pump out oil Refill OWS with continued water to reset sensors Resume OWS operation OR Leak Detection See Leak Detection System procedure page 30 HIGH OIL Alerts operator of High Oil level Oil has reached a predetermined level and must be pumped out as soon as possible RESPONSE Stop OWS operation Pump out oil Refill OWS with water to reset sensors Resume OWS operation HIGH HIGH OIL Alerts operator of High High Oil level Oil has reached a critical predetermined level and must be pumped out immediately RESPONSE Stop OWS operation Pump out oil Refill OWS with water to reset sensors Resume OWS operation ALARM TEST Temporarily closes the control panel circuits to provide an audible and visual system test ALARM SILENCE _ Silences the audible alarm temporarily for operator to perform service Does not cancel alarm mode LEAK Alerts operator of a leak in either primary or secondary wall of OWS Does not discriminate if leak is fuel or water RESPONSE See Leak Detection System procedure page 30 LEAK TEST Temporarily closes the control panel s leak detection circuit to provide a system test FUEL LEAK Alerts operator of a leak from primary wall of OWS in
37. nding paste To minimize water contamination of the oil connect the oil suction hose to the 4 inch diameter Oil Pump out Pipe fitting coupling or open and use one of the OWS manways to skim oil Using suction remove the oil Refill OWS with clean water to deactivate the High Oil Level Alarm see Start Up Instructions page 21 Oil Removal Procedures Determine where the oil water interface by using a sampling device without optional oil or a gauge stick with water finding paste level controls If oil water interface level is beyond the maximum allowable level oil needs to be removed and the OWS refilled with clean water To minimize water contamination of the oil use the 4 inch diameter Oil Pump out Pipe fitting if present or open and use one of the OWS manways to skim oil Using suction remove the oil Refill with clean water see Start Up Instructions page 21 Mixed Oil and Water Place a 3 inch or smaller suction hose inside the OWS through Removal Procedures either the 4 inch diameter Gauge Port in the Sediment Chamber Manway or through the Sediment Chamber Manway The suction hose nozzle should be 12 inches or higher above the OWS bottom If nozzle extends closer to the bottom sludge may be inadvertently removed Using suction remove all contents from the OWS Refill with clean water see Start up Instructions HEX www highlandtank com e 33 Major Oil Spill Response Procedures IMPORTANT A major oil spill is a
38. of Testing and Materials ASTM 448 or equivalent 100 through a 1 2 inch 13 mm sieve and no more than 12 by dry weight through a 200 sieve 0 0029 Inch 0 0754 mm Pea gravel shall be no larger than 3 4 inch 19 mm See Fig 5 Fig 5 Remove all large and sharp rocks debris from excavation prior to lowering OWS into position Slope of excavation determined by soil type and or code Consult AHJ 7 24 Minimum 12 Minimum Clean inert sand pea gravel or crushed stone Note When OWS is to be installed on a concrete pad a minimum of 6 inches of bedding material must cover the entire pad Grade and level bedding to extend at least two feet around the perimeter of the OWS for backfill operations SSS 12 www highlandtank com Excavation and Bedding The bottom of the excavation must be covered with bedding continued material to a minimum depth of one foot suitably graded and leveled and extend at least two feet around the perimeter of the OWS for backfill operations Place at least 24 inches of backfill between any adjacent OWSs tanks and excavation walls See Fig 6 Fig 6 Remove all large and sharp rocks debris from excavation prior to lowering OWS into position 24 Minimum lt ___ Slope of excavation determined by soil type and or code Consult ete atanancsntrcton ae sane twin cod Placement of the OWS The OWS must be installed in a level and plumb position Check ele
39. ou for purchasing a Highland Tank Oil Water Separator the leading high performance separator in the industry The purpose of this manual is to provide detailed information on the installation venting startup operation maintenance and trouble shooting of Highland Tank s Oil Water Separator These instructions should be used in conjunction with any and all other applicable installation and corrosion protection system instructions e Highland Tank s HighGuard Tank Installation Instructions HT 7001 e Petroleum Equipment Institute Installation of Underground Liquid Storage Systems PEI RP100 e Steel Tank Institute ACT 100 U Installation Instructions R971 or sti P4 Installation Instructions R821 e Any and all applicable federal state and local codes Always check with Authority Having Jurisdiction Note This manual is based on standard OWS configurations Other custom configurations are available Verify the supplied configuration prior to installation and testing Abbreviations used OWS Oil Water Separator Authority Having Jurisdiction PSIG Pounds per square inch gauge OSHA Occupational Safety and Health Administration www highlandtank com 3 Important points to consider prior to installation operation and maintenance of the OWS Carefully read and follow instructions in this manual Local codes and ordinances may apply Check with local prior to installation of OWS e Ens
40. ove fuel and test tank for tightness If water is found note level Pump out interstice Water in the interstice can sometimes be caused by condensation or ground surface water infiltration It may be necessary to pump out several times with a waiting period between pump outs to remove all of the accumulated water Starting level will lower with each pump out After water has been removed from OWS interstice reinstall sensor and wiring making sure to seal all threaded connections with approved sealant Restart OWS operation as described earlier 30 www highlandtank com Maintenance CAUTION Separated liquid oil and vapors are flammable and or combustible WARNING Never enter an OWS or enclosed space under any condition without proper training and OSHA approved equipment See OSHA Regulations for Permit Required Confined Spaces 29 C F R S 1910 146 All enclosed spaces must be properly vented prior to entry to avoid ignition of flammable materials or vapors Atmosphere must be properly tested for combustible vapors and oxygen prior to entry Entering the OWS without using an approved breathing apparatus may result in inhalation of hazardous fumes causing headache dizziness nausea loss of consciousness and death Required entry equipment includes but is not limited to e Lifelines e Safety harnesses safety belts are unacceptable e Self contained breathing apparatus e Respirators canister type e Rescue harness
41. required fill OWS with clean water After ballasting is complete check elevations for proper tolerances Note Highland Tank recommends maintaining the excavation dewatering process until installation is complete 16 www highlandtank com Piping amp Venting Piping IMPORTANT OWS Venting Guidelines Inlet piping installation should be straight and true with as few turns as possible to limit turbulence When dielectric isolation is required consult Steel Tank Institute ACT 100 U Installation Instructions R971 or sti P Installation Instructions R821 and Petroleum Equipment Institute PEI RP100 for further instructions Attach inlet outlet piping contractor supplied to inlet outlet pipes on the OWS Inlet and outlet inverts were established during manufacturing Do not modify without first consulting Highland Tank The OWS inlet and outlet piping must be sloped from 1 8 inch to 1 4 inch per foot to maintain gravity flow A greater slope or a free fall of wastewater in the OWS will cause turbulence which adversely affects OWS performance Piping must also be designed to limit flow into the OWS to the flow rate specified Use of a flow control device may be required OWS outlet piping must be designed to flow at a rate equal to or greater than the inlet piping to avoid any potential backup The OWS should be fitted with properly sized inlet and outlet shut off valves contractor supplied for emergency shut down and s
42. terstitial monitoring port of a double wall OWS After vacuum testing release vacuum from the OWS before dismantling testing equipment Do not relieve pressure until OWS is secured in its final resting position Single Wall OWS Remove factory installed temporary plugs amp thread protectors Air Test Apply compatible non hardening pipe sealant to threads and install reinstall liquid tight steel or cast iron plugs at all unused openings taking care not to cross thread or over tighten plugs Manway gaskets lids and blind flanges must be in place prior to performing air test Refer to Steel Tank Institute ACT 100 U Installation Instructions R971 or sti P49 Installation Instructions R821 if nylon dielectric bushings are present Perform air test for a single wall OWS as illustrated in Fig 3 below Temporarily plug cap or seal off remaining OWS openings to hold pressure Open valve A and pressurize the OWS to a maximum of 5 PSIG Seal the OWS by closing valve A and disconnect the external air supply Apply a soap solution to all welded seams and fittings Inspect to assure that no leaks exist Fig 3 Gauge Overpressure Relief Device Set at 5 PSIG n Valve A Air Supply A www highlandtank com 9 Pre installation Tightness Testing Procedures continued Double Wall OWS Air Test Valve C Gauge 2 m __ Outer Wall Double wall OWSs require different air pressure testing procedures
43. the OWS Position deadman anchors as shown in Fig 7 filling the soace between them with approved backfill material Fig 7 Concrete Deadman Anchors Polyester Hold Down Strap fat Tank gt Turnbuckle Galvanized with Hook Wire Rope or Jaw Ends Cable Clamps ON wm m m Vas PE EE eno o deadman anchors level with bottom of OSI Fill area between deadmen with 12 or 18 o approved bedding material eus Distance between inside edges of Concrete Deadman Anchors equivalent to tank diameter Tie Down Anchors Deadman Anchors Contractor supplied items 14 www highlandtank com Anchoring When anchoring by means of a concrete pad is required the OWS continued must not be placed directly on the pad See Fig 8 A layer of bedding material 6 inches deep must be spread evenly over the dimensions of pad to separate the OWS from the pad Bedding deeper than 12 inches require specially designed hold down straps Contact Highland Tank if 12 inch or deeper bedding is to be used The OWS must not be placed on any other hard or sharp material which might cause deformation of the OWS or damage to the coating Fig 8 Standard Steel Hold down Straps with Concrete Hold down Pad Ss Strap Hold down Strap with neoprene liner Turnbuckle Hole in angle for anchor bolt Anchor Bolt 6 Minimum Approved Bedd
44. to interstice RESPONSE Contact Highland Tank for procedure Fuel leak will cause only fuel leak alarm WATER LEAK Alerts operator of a water leak from primary or secondary wall of OWS into interstice RESPONSE Contact Highland Tank for procedure Water leak Will cause both fuel and water leak alarm FUEL LEAK TEST Temporarily closes the control panel s fuel leak detection circuit to provide a system test WATER LEAK TEST Temporarily closes the control panel s water leak detection circuit to provide a system test www highlandtank com e 29 Leak Detection Leak Detection Procedure for fuel or water in the OWS interstice System Procedure Optional For easy and efficient monitoring of the interstitial soace the OWS may be equipped with a Liquid Leak Detection Sensor to activate warning alarms if the interstitial soace becomes filled with hydrocarbons or water during operation If the audible alarm is activated during operation it can be silenced by momentarily depressing the SILENCE push button The interstitial space can be checked by otopping OWS operation After flow has stopped remove leak detection sensor from monitoring pipe being careful not to damage sensor or communication wiring Place sensor in a dry safe place during water removal procedure Use a gauge stick to inspect the monitoring pipe for the presence of oil or water IMPORTANT If a suspicion of a leak exists contact a tank testing professional to rem
45. ure adequate site space almost all products are delivered on a 5 foot long tractor trailer Allow space for unloading positioning and temporary storage if applicable e Ensure the crane has adequate lifting capacity and clearance have operator check site for clearances overhead turning etc Spreader bars may be required for 10 foot diameter and larger OWSs OWSs that are 10 foot diameter and larger are typically shipped rotated to minimize over the road height They must be lifted from the hauling trailer by the supplied lifting lugs on the heads of the OWS They must then be rotated before final lifting into the excavation Spreader bars and or adequate lifting straps chains must be available to maintain recommended safe lifting capacity Please check approval drawing for overall length of the OWS and location of the head lifting lugs DO NOT rotate the OWSs while they are still on the trailer damage may result OWSs must be lifted from the trailer using the lifting lugs supplied on the heads and lowered onto a flat area free from anything that may cause damage to the exterior coating Once the OWS is stable the lifting device may need to be repositioned and then reattached to the lifting lugs on the top centerline of OWS At this point slowly roll the OWS to upright position on the ground before lifting to place in final resting position Special permits may be required for weight size etc by local code or ordinance Confirm
46. vations at each end of the OWS with a transit and adjust as necessary to 1 2 inch in 20 feet Check elevations across the diameter of the separator tank and adjust to 1 4 inch in 10 feet gt K amp C E_ EqK ii_ K __ _ 1 www highlandtank com 13 Anchoring High water tables or partially flooded excavation sites exert significant buoyant forces on OWS Buoyant forces are partially resisted by the weight of the OWS the backfill and any pavement atop the OWS Additional buoyant restraint when required 15 obtained by using properly designed hold down straps in conjunction with concrete hold down pads or deadman anchors The use of steel cable and or round bar as buoyant restraints is prohibited Steel hold down straps must always be kept from contacting the OWS shell by an oversized separating pad made of inert insulating dielectric material several hold down methods are available for anchoring the OWS in the excavation Consult AHJ and choose the method that completely satisfies all requirements for the installation location Highland Tank s Deadman Anchoring System employs concrete deadman anchors and polyester hold down straps When using deadman anchors the bottom of the excavation native earth shall be covered with a minimum of 12 inches of bedding material suitably graded and leveled Bedding and backfill shall surround the OWS to a width and depth of 24 inches minimum all around
47. y a thermostatically controlled steam or electric heating device may be installed e Complete the OWS Installation Checklist and Start up Report Form HT 9039 A copy of the completed form should be retained by the OWS owner and or installation contractor e Complete the HighGuard ACT 100 U or sti P Installer Information Card that was included with the delivery documents This information is required to activate and maintain the Limited Warranty e OWS must be filled with clean water before introducing any wastewater Filling should only be done after OWS has been leveled and anchored in final installation location www highlandtank com 5 Installation Care in Handling OWSs OWS Unloading Lifting and Moving WARNING Under no circumstance should chains or slings be used around the OWS shell Always use two lifting lugs to lift OWS OWSs must not be dropped dragged or handled with sharp objects and except as minimally necessary for inspection and testing should not be rolled Lifting equipment must be of adequate size to lift and lower the OWS without dragging dropping or damaging the OWS or its coating The OWS must be mechanically unloaded Use extreme care when unloading as weight distribution of OWS may be uneven Lifting and moving the OWS must only to be done using the lifting lugs welded to the OWS OWSs should be carefully lifted moved and lowered using cables cha
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