DWYER INSTRUMENTS, INC. Phone: 219/879-8000
Contents
1. Series SSM 316 amp SSB All Metal Flowmeters are ideal for dirty or Opaque fluids high temperature and high pressure service and harsh environments The direct reading scale provides 2 accuracy Flowmeters can quickly be disassembled without removing the body from the pipeline for easy cleaning SAFETY PRECAUTIONS Personnel safety should be considered before pressurizing and operating the system There are numerous possibilities for error in system operation and maintenance as well as component installation Because human eyes must necessarily come into close proximity with the flowmeter to read it Dwyer Instruments Inc recommends that safety shielding such as a sheet of transparent high impact material be used in front of the meter If hazardous toxic or flammable fluids are being metered recommended Safeguard should include methods to protect personnel from splash or rebound A method of quick safe removal of dangerous fluids should also be included INSTALLATION PREPARATION Series SSM amp SSB All Metal Flowmeters are ready to install as is although the sight tube may need repositioning so the scale is visible after installation First remove the protective caps from the connection ports ALSO REMOVE THE PLASTIC TUBING ABOVE THE INLET CAP IN THE METER CORE TUBE This tubing blocks the float assembly in place during shipment Check that the float moves freely within the core tube and that no packing materials are in the mete2. and carefully inspected There may be some error in checking the meter against another standard APPARENT METER READING MIGRATION reading changes but flow appears constant Frequently caused by use of soft disc type valves which may need to be replaced with a valve more suited to flow control Can also be indicative of changing fluid conditions density viscosity etc Problems with other elements of the flow system including leaks clogged filters pump compressor wear etc may first appear as a change in meter reading one of the functions of a flowmeter LEAKAGE If at the junction of the body and sight tube it is indicative of either a damaged O ring most common b damaged sight tube or c damage to the gland section of the body It may also be caused by improper reassembly of the flowmeter in the field If there is leakage at the pipe connections to the meter it is probably caused from over tightening pipes on a prior installation or the initial installation Remedies include tapping the meter gently to temporarily dislodge the float but if problem reoccurs meter should be disassembled amp cleaned and or snorkel guide rod straightened If hang up caused by sludge or pipe scale clean lines amp install a filter or other form of cleaner in supply line If surges have caused the internals to unseat install a desurger accumulator etc Modification of piping such as addition of a desurger receiver accumul
3. and or filtration will also solve problems due to dirt If metering liquids with high viscosities consult Dwyer Instruments Inc may require special calibration If none of these causes seem to be present contact Dwyer Instruments Inc for assistance Verifying the proper fluid conditions are known and applying correction formulae as needed will remedy problems associated with changing fluids Cleaning servicing and replacement and or repair of other system components may be required Replace any damaged parts immediately using the proper assembly procedures indicated in this instruction and the assembly detail drawings Remove the body and inspect for damage if none is visible check pipe threads reapply proper thread lubricant sealant and reinstall If leak persists replace meter body NOTE Flowmeters are hydrostatically pressure tested before they are shipped Dwyer Instruments Inc encourages you to contact your Dwyer Instruments Inc representative or the factory with any questions regarding proper installation and operation of our flowmeters Copyright 2007 Dwyer Instruments Inc Printed in U S A 8 07 R1 443566 00 DWYER INSTRUMENTS INC J Phone 219 879 8000 www dwyer inst com P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A Fax 219 872 9057 e mail info dwyer inst com
4. normal only when a larger vessel or pipe section is reached the energy dissipated thru friction and pipe expansion or some component ruptures Rupture of piping valves flowmeters or other components have obvious safety ramifications that must be addressed Surge Chambers amp Accumulators Flowmeters are more accurate and less likely to be damaged when the fluid flow is smooth If the meter must be installed on a line where reciprocating pumps causing pulsation are used Surge Chambers accumulators or desurgers are strongly suggested to dampen the shock wave This is a good general practice for all flowmeters SIGHT TUBE ROTATION Series SSM amp SSB All Metal Flowmeters use magnetically linked ball indicators and the scale usually may be positioned over approximately a 300 range However the magnet position must also be changed accordingly requiring removal of the sight tube see Disassembly On standard SSM amp SSB All Metal Flowmeters as www dwyer inst com e mail info dwyer inst com depicted in Figure 1 the magnet slides out of the carrier at the top of the float assembly The screw holding the carrier to the float may be loosened to allow rotation of the carrier toward the desired scale location Re tighten the screw thread sealant is recommended replace magnet and reassemble the meter see Assembly Verify that the ball indicator has been captured by the magnet If not rotate the sight tube DO NOT twi
5. times 1 096 Ol MAXIMUM FLOWS WITHOUT EFFECTING ACCURACY FOR UNDERSIZED PIPES CONNECTED DIRECTLY TO FLOWMETER INLETS ID GPM LIQ ATMOS 50PSIG 100PSIG 200PSIG 0 132 0 864 3 8 0 243 LL 3 4 0 679 831 444 31395 347 69 1 182 1 12 2 Data per Cameron Hydraulic Data Based on 5 FPS max liquid velocity having no effect on flowmeters accuracy if the inlet pipe is smaller than the meter connections t SCFM 0 445 x psig 14 7 x ID Based on 20 FPS max air velocity having no effect on flowmeters accuracy if the inlet pipe is smaller than the meter connections CORRECTING READINGS FOR NEW GAS CONDITIONS Og 7Os PgXxTsXPs Po XTqgXxP 9g g Where Qg SC FM corrected to new conditions Oc SCFM read on meter scale P g Operating pressure psia psig 14 7 Q Pressure stated on scale psia psig 14 7 Tg Operating temperature absolute F 460 T Temperature stated on scale absolute F 460 Pg S pecific gravity of metered gas Pc Specific gravity stated on scale EXAMPLE If using a standard meter scaled for SCFM Dry Air 100 psig 70F on argon SP GR 1 378 at 50 psig 100 what would the conversion factor be Q 1 00 _64 7 x1 00 x530_ _ 9 622 Vv 1147 x1 378 x560 0 Thus actual flow of the argon would be the observed scale reading times 0 622 STEAM Series SSM amp SSB gas flowmeters may be used for vapors such as steam The conversion factor may be determ
6. HOOTING SYMPTOM USUAL CAUSE SUGGESTED REMEDY FLOAT HANG UP Caused by particles sludge etc including failure to remove the plastic tubing used to block meter float during Shipment inside the core tube and or sight tube holding float A bent snorkel tube guide rod usually caused by careless disassembly or violent surges may also be causing float to stick Violent surges may also unseat the internals in extreme cases FLOAT BOUNCE Caused by pumping compressor surges or other pulsation sources loose valve disks or similar mechanical components extreme violation of inlet piping recommendations or for gas applications harmonics commonly found in systems with low pressure low density gas LOSS OF BALL INDICATOR Caused either by rotating the sight tube without realigning the float magnet or sudden flow surges or shocks APPARENT FALSE READINGS LIQUID METERS Liquid density not according to calibration data differ temperature or new liquid or liquid mixture excessive dissolved or suspended solids or gases partial clogging of core tube slot or foreign matter interfering with float movement or viscosity levels above the meter s immunity index V I C NOTE If the meter is suspected of giving false readings and none of the causes mentioned is found please advise Dwyer Instruments Inc as to the method used in determining the suspected flow error Each Flowmeter is individually calibrated by traceable methods
7. ator vibration eliminators loops hoses etc between the source and meter should remedy the problem Severe vibration may ultimately damage the meter and should be avoided If bounce seems to be from some other source or shocks such as water hammer a potentially dangerous condition discontinue using the meter and contact Dwyer Instruments Inc Check the ball alignment to magnet by removing the raceway cover and using the tip of a small screwdriver to locate the float magnet Rotate the sight tube as required and replace raceway or disassemble meter to change magnet position if required If the alignment is okay eliminate system shock or surges with desurgers or accummulators By determining the actual density due to changes in mixture temperature etc the correction formulae may be applied If dissolved gases are in the liquid some elimination means should be provided on the supply side also recheck all piping as improper seals at connection points are common sources of air in the liquid If the metered liquid is near the boiling point producing partial flash gas at the meter relocate the meter to point of lower temperature and or higher pressure or cool lines and or increase system pressure Note It is potentially dangerous to meter near the flash point of any fluid and this practice should be avoided Consult Dwyer Instruments Inc for recommendations The previous recommendations regarding cleaning the meter
8. d a more abrasive resistant construction To order parts include the model and serial number of the units involved and description of the part ordered If converting the meter to a new application in addition to the model and serial numbers SEND DWYER INSTRUMENTS INC COMPLETE APPLICATION DATA INCLUDING FLUID MAXIMUM FLOW RATE MAXIMUM AND OPERATING PRESSURES AND TEMPERATURES AND APPLICATION PARTICULARS OR FLUID CHARACTERISTICS This information is essential for Dwyer Instruments Inc to provide proper items and verify that the new application is within the operating limits of the flowmeter TEMPERATURE VS PRESSURE OPERATING LIMITS SERIES SSM amp SSB ALL METAL FLOWMETERS METER SIZE amp MATERIAL 6 3 4 NPT Stainless 12 1 1 2 NPT Stainless 1000 1000 1000 MAXIMUM NON SHOCK WORKING PRESSURE PSIG F OF 70F 300 F t 350F t 400 F 450 F t 500 F t 600 F t 790 770 760 x OPERATING LIMITS GIVEN ARE BASED ON WATER OR AIR FOR MORE SEVERE SERVICE CORROSIVE AND OTHER MEDIA AND OR ENVIRONMENTAL FACTORS AN ADDITIONAL CORRECTION FACTOR DOWN RATING THESE LIMITS MAY BE REQUIRED LIMITS ARE BASED ON TESTING AND PRACTICAL EXPERIENCE POSSIBLE EXTREME APPLICATIONS CONDITIONS CANNOT BE FORESEEN THUS DATA OFFERED ONLY AS A GUIDE IT INNO WAY CONSTITUTES A SPECIFIC RECOMMENDATION OR WARRANTY EXPRESSED OR IMPLIED T OPERATING TEMPERATURES ABOVE 300F REQUIRE SPECIAL HIGH TEMPERATURE MODIFICATIONS TROUBLES
9. ed Material T316 SS Alnico magnet FKM O ring Temperature Limits 3009F 149 C temperatures from 300F to 600 F 149T to 316 C require hot top sold separately Pressure Limits 3 4 models 1000 psig 68 9 bar 2509F 121 C 1 1 2 models 800 psig 55 bar 250 F 121 C See the chart on pg 6 for temperature vs pressure ratings Accuracy 2 full scale Repeatability 0 5 of indicated flow rate Process Connections 3 4 or 1 1 2 female NPT Scale Length 3 4 models 3 2 8 cm 1 1 2 models 5 2 13 cm Weight 3 4 models 5 Ib 2 3 kg 1 1 2 models 13 lb 5 9 kg solvents in the vicinity of polysulfone sight tubes the tube should be removed until fumes clear SURGE amp WATER HAMMER PREVENTION Operating Limits are for non shock conditions only Flowmeters are more accurate and less likely to be damaged when the fluid flow is smooth Water hammer is a hazardous phenomenon and should be eliminated from any fluid system Water hammer is a Series of pressure shocks create by a sudden change in the flow velocity of liquid in a pipe This sudden change often caused by a fast acting valve or starting stopping or change in Speed of a pump generates an immediate rise in pressure that sometimes makes a noise similar to striking the pipe with a hammer The pressure wave is transmitted from the source throughout the system subjecting every component to the sudden shock Pressure returns to
10. ined with the following formula Where MfpActual flow Ibs hr Qm Meter scale reading Std SCFM Dry Air 100 psig 70F Sy Specific volume of media from steam table EXAMPLE When using a standard gas meter scaled from SCFM Dry Air 9 100 psig 70 what is the conversion factor for lbs hr steam at 50 psig 300F Me o 5 879 th 46727 Thus actual flow of steam in lbs hr would be the observed scale reading times 2 267 VISCOSITY CONSIDERATIONS Each liquid flowmeter has so called Viscosity Immunity Ceiling V I C Usually if the viscosity of the metered liquid is less than the V I C the meter will be influenced significantly and must be calibrated for that viscosity Effects of viscosity on a given flowmeter are not always predictable Two apparently similar liquids with comparable densities and viscosities may impact meter calibrations quite differently The table below provides general guidelines for the typical maximum viscosity for meter models without affecting accuracy AVERAGE V I C CENTISTOKES FOR STANDARD THRU VIEW FLOWMETERS 3 4 METERS 1 1 2 METERS CTS 0 54 0 80 1 20 2 60 3 80 7 00 10 0 23 0 10 0 23 0 MAINTENANCE Upon final installation of the Series SSM amp SSB All Metal Flowmeters no routine maintenance is required A periodic check of the system calibration is recommended The Series SSM amp SSB All Metal Flowmeters are not field serviceable and should be ret
11. r RECOMMENDED PIPING Series SSM amp SSB All Metal Flowmeters generally have no special straight run or other piping requirements Inlet piping should be the same size as the meter connection Some effect on meter accuracy may occur at high flow velocities if inlet piping guidelines are violated Please refer to the table on the next page When installing on different size pipe use standard pipe adapters and come into the meter inlet with a nipple 8 diameters long of the same size for greatest accuracy Control valves should be mounted on the outlet side of the meter The use of a three valve manifold around the meter is Suggested as it allows uninterrupted process flow while the meter is being cleaned PLUMBING IN While the flowmeters should be vertical exact plumbness is not necessary A general rule is that if the meter appears plumb it is close enough even if off by 109 the predictable reading error is usually less than 1 Pipe should be cut to proper lengths to avoid stress on the meter Avoid over tightening and do no use wrenches on the body or sight tube If using DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A MODEL SSM110 111 112 Phone 219 879 8000 Fax 219 872 9057 Bulletin F 41 B Series SSM amp SSB All Metal Flowmeters Specifications Installation and Operating Instructions 5 695 3 710 145 94 MODEL SSM113 115 SPECIFICATIONS Service Compatible liquids Wett
12. rsion factor for the new system condition and multiplying the scale reading by that factor In the problems to the right Q s has been assigned a value of 1 to determine the conversion factor Dwyer Instruments Inc can provide special scales at additional cost for other fluids and or units CAUTION DO NOT OPERATE THE FLOWMETER ON A SYSTEM EXCEEDING THE OPERATING LIMITS OF THE UNIT WHEN CHANGING OPERATING CONDITIONS MAKE SURE THAT THE NEW SYSTEM CONDITIONS ARE WITHIN THE FLOWMETER OPERATING LIMITS AND ALL WETTED MATERIALS ARE COMPATIBLE WITH THE FLUID CORRECTING READINGS FOR NEW LIQUID CONDITIONS o Ps PfPa o ds df da Macs PaPtPs Mg e da df ds Where Qa Actual flow GPM or same units as scale Qs Meter reading from scale Scale units ps Specific gravity of calibration liquid related to water in std atmosphere at 70F being 1 00 pa Specific gravity of metered liquid same base ds Density of calibration liquid lbs ft3 da Density of metered liquid lbs ft3 pf2Specific gravity of meter float df Density of the meter float as per Table below FLOAT SPECIFIC GRAVITIES DENSITIES Material pf df Stainless Steel 501 1 EXAMPLE Using a standard brass meter scaled for water ps 1 00 what is the conversion factor for an oil with a specific gravity of 0 85 1 00 8 30 0 85 _ Qa 100 0 85 8 30 1 00 7090 Thus actual flow of the oil would be the observed scale reading
13. st on the edges of the plastic raceway assembly until the ball is grabbed by the float magnet SEC A A TOP VIEW METAL PRESSURE TUBE BALL INDICATOR POLYCARBONATE COVER PHENOLIC RACEWAY FIGURE 1 STARTUP System flow should be started with the bypass valve open and meter inlet and outlet valves closed After the system is operating open the meter inlet valve gradually to equalize internal pressure Then slowly crack meter outlet valve and wait for float to stabilize Finally slowly open the meter outlet and or flow regulating valve all the way and close the system by pass valve AVOID SUDDEN SURGES THAT CAUSE THE METER FLOAT TO SLAM INTO THE TOP OF THE SIGHT TUBE Although not essential the meter sight tube should be filled to a level above the float on liquid systems The snorkel tube present in most standard models allows escape of entrapped gases except for a small pocket in the upper end which helps cushion hydraulic shock To assure proper filling and to flush any foreign particles from the meter operate the system at full flow briefly at startup READING FLOW Read flow directly from the scale as the number nearest to the center of the ball indicator COMPENSATING FOR SYSTEM CHANGES To find the correct flow reading for a system whose fluid conditions vary from those for which the meter is scaled use the conversion equations provided The most practical method of applying the formulae is to calculate a conve
14. t tube brush If solvents are used make sure they are compatible with meter parts CAUTION DO NOT SCRAPE OR USE ABRASIVE MATERIALS FOR CLEANING FLOWMETER ASSEMBLY In general replace all parts in reverse order of the disassembly 1 Place the slotted meter tube into the body aligning the key at the bottom of the tube with the keyslot in the bottom of the body 6 Slide the inner flange ring over the sight tube When properly seated the top of the flange ring should be flush with the bottom edge of the snap ring groove 2 Place the spider over the meter tube with the notched leg over the 7 Separate the coils of the spiral retaining ring and insert one end into the snorkel tube or guide rod Slide the spider down to the meter tube s body groove Wind the ring into the groove making sure the ring is shoulder properly seated Then replace the ball indicator the tip of a screwdriver can be used to help locate the magnet and replace the raceway and 3 Place the meter float in the meter tube aligning the notch in the raceway cover indicator disk with the snorkel Kk If reassembled correctly the center of the ball indicator should lineup with the scale zero either dotted black or scribed line If it does not disassemble the meter completely and carefully reassemble it making sure 4 Seat the O ring on the sight tube lubricating it with a small amount of the slotted meter tube is comple
15. tely seated in the body service compatible silicone grease or petroleum jelly to facilitate replacement If new flow internals are used the scale may have to be remounted on the sight tube Depending on the model type this can be done either by loosening the mounting screw or reattaching the scale with double sided adhesive new flow internals are shipped with a new scale 5 Using hands only press the sight tube firmly down into the meter body with a twisting motion Be careful not to rock the sight tube side to side and bend the snorkel tube guide inward where it might interfere with float movement Rotate sight tube as necessary for scale visibility and or alignment of the raceway screw REPLACEMENT PARTS Under proper care there should be no need to stock replacement parts If the service or environment is quite harsh or frequent meter disassembly dictated a spare O ring may be desirable Otherwise parts only need to be replaced if damaged Any visible damage to the entire surface of the O ring or sight tube particularly from the bottom edge indicates need for replacement To insure accuracy the inside Surface of the meter core tube slot edges and OD of the float piston Should be free of nicks chips with no visible erosion of any surfaces If abrasive particles are suspended in the meter fluid it may be desirable to keep replacement core tube float assemblies on hand Dwyer Instruments Inc may also be able to recommen
16. urned if repair is needed field repair should not be attempted and may void warranty Be sure to include a brief description of the problem plus any relevant application notes Contact customer service to receive a return goods authorization number before Shipping METER DISASSEMBLY O NEW SPIRAL RETAINING RING INNER FLANGE RING SIGHT TUBE ASSEMBLY STATIC O RING SEAL TUBE FLOAT ASSEMBLY MAGNET S FIGURE 2 PARTIALLY EXPLODED DRAWING OF SERIES SSM amp SSB ALL METAL FLOWMETERS It is not necessary to remove the flowmeters from the pipeline for cleaning or replacing parts The body remains plumbed into the pipe allowing easy service and even installation of the different sensing elements to accommodate new flow rates or fluids Figure 2 shows some of the major components Step by step disassembly and reassembly instructions and photos are included in the following CAUTION BE SURE PRESSURE IS FULLY VENTED AND FLUIDS COMPLETELY DRAINED BEFORE DISASSEMBLING THE FLOWMETER DISCONNECT POWER TO ELECTRONIC ACCESSORIES WEAR SAFTEY GLASSES AND PROTECTIVE CLOTHING IF THERE IS A CHANCE OF EXPOSURE TO HAZARDOUS FLUIDS 1 Remove the raceway cover by removing the stainless screw at the top and lift it up and off the meter Remove the black phenolic raceway being careful not to displace the ball indicator Remove the ball indicator by hand and set it where it will not be lost 2 Using a screwdri
17. ver carefully pry the notched end of the spiral retaining ring out of the body groove Move the screwdriver blade under the ring the action is very much like putting a key on a key ring Continue until the entire spiral ring has been removed from the groove please see the photo below 3 Using hands only pull the sight tube straight up out of the body with a slight twisting motion lifting it clear of the body and snorkel The inner flange ring will lift off with the sight tube 4 Remove the float assembly by lifting it up and away from the snorkel The core tube assembly may then be lifted out If stuck CAREFULLY pry at the top of the slot with a brass rod taking care not to damage the body or core tube The spider ring and O ring will come out with the core tube If the core tube is stuck try removing the metal spider ring first please see the photo below INSPECTION amp CLEANING Inspect parts for nicks scratches chips wear and contaminant build up The edges of the core tube slot ID of the core tube and OD of the piston largest section at the float assembly bottom are precision machined Damage to these areas can destroy the meter s accuracy Also inspect the O ring the bottom section of the sight tube and the inside of the upper body section Damage to these areas may result in leaking Clean rinse and dry all parts carefully including the O ring preferably with a mild detergent and water and a soft cloth or sof
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