M-IN-240
Contents
1. 16 GE 1 EEE RE 16 6 2 7 Combinating totalizer pulse combinator 16 2 PE usunne me 17 6 2 9 Temperature compensating 17 6 2 10 Remote cket printati ERES 17 T PROVE RS snaa eee 17 FT PP P NK ate ai 1 SETT EG TT 19 DOCUMENTATION Luske a aug 20 ETT ETE EE 20 02 Al Ordering Gage avsmak Naas ua hue CUD 20 8 3 Final Drawings and DAA 21 0 GUARANTEES svei 21 10 TESTING ANG INSPECTION iaieineea aaan a EEEE aR 21 LEE EEE EE 21 10 2 Manufacturers Works 22 1021 REE 22 Oct 1996 IPS M IN 240 ER 22 10 23 ee RR Rice cae se ee 22 WOE 3 SY SION EE PS NE Re a 22 EE EE EE bes banish amas 22 10 31 Hydrostatic testing sundene bena toto aat 23 KES G EN anion 23 EE EE EE E E E A ER 23 Ti PACKING AND SHIPMENT iirrainn iiaea eaae a AE EARS 23 Oct 1996 IPS M IN 2402. IPS M IN 240 MATERIAL STANDARD FOR MEASUREMENT OF LIQUID HYDROCARBONS CUSTODY TRANSFER ORIGINAL EDITION OCT 1996 This standard specification is reviewed and updated by the relevant technical committee on Nov 2012 The approved modifications are included in the present issue of IPS This Standard is the property of Iranian Ministry of Petroleum All rights are reserved to the owner Neither whole nor any part of this document may be disclosed to any third party reproduced stored in any retrieval system or transmitted in any form or by any means without the prior written consent of the Iranian Ministry of Petroleum Oct 1996 IPS M IN 240 FOREWORD The Iranian Petroleum Standards IPS reflect the views of the Iranian Ministry of Petroleum and are intended for use in the oil and gas production facilities oil refineries chemical and petrochemical plants gas handling and processing installations and other such facilities IPS are based on internationally acceptable standards and include selections from the items stipulated in the referenced standards They are also supplemented by additional requirements and or modifications based on the experience acquired by the Iranian Petroleum Industry and the local market availability The options which are not specified in the text of the standards are itemized in data sheet s so that the user can select his appropriate preferences therein The IPS standards are ther
3. 15 24 V dc Figures Ticket 7 figures for non reset totalizer Reset Start print and finish accomplished electrically Environment temperature 0 70 C 7 PROVERS 7 1 Pipe Provers 7 1 1 Provers shall be fabricated for not less than 150 Ib ANSI rating 7 1 2 Piping for prover barrel shall be perfectly round and free from bars grooves pits or dents If welding of pipe or fittings is required the weld must be a full penetration weld and must be ground smooth 17 Oct 1996 IPS M IN 240 7 1 3 Flanges used in the measuring section of the prover should be match bored and machined for metal to metal surface contact with tongue and groove ring fit 7 1 4 Internal surface of the entire length of the prover barrel shall be coated to reduce frictional drag on the sphere and protect the measuring section from rust or pitting The coating must have hard smooth long lasting finish and must be applied only after the internal surface of the prover barrel has been sandblasted to white metal base NACE No 1 and then be coated with baked on phenolic or air cured epoxy system Coating thickness shall be in 4 7 mils range 7 1 5 The Bi directional prover shall be complete with inlet and outlet flanged connections not less than class 150 Ib ANSI rating for fitting 4 way diverter valve along with displacer stops drains and vents 7 1 6 The uni directional prover shall be complete with an interchange valve controlled by an actuator
4. 11 4 The shopping mark purchase order number and any other particulars as requested in the requisition shall be stencilled on each separate packing and or on the outside of each wooden case or crate 11 5 The supplier shall inform the user of the estimated total weight and dimensions of each shipping section of the cabinet and its termination rack within four weeks of the acknowledgment of the Purchase order 11 6 The Manufacturer shall provide a complete packing and handling specification to cover both skid and electronic panels 23 Oct 1996 IPS M IN 240 11 7 Prior to shipment all high accuracy skid mounted instruments shall be removed packed separately and shipped with the skid Turbine meters shall be replaced with pipe spools and shipped with the skid 11 8 Full consideration shall be given to the need for long term preservation of the skid and metering electronics after testing has been completed The Manufacturer shall furnish recommendations for long term preservation at designated site for the periods prior to installation and after installation PROVER SECTION PRESSURE GAUGE AND VENT CONNECTIONS THERMOMETER WELLS DETECTOR SWITCHES OUTLET BLOCK VALVE SHILDED CABLE FOUR WAY DIVERTER VALVE F SPHEOID COUNTER gt CL POWER SUPPLY MAIN LINE 7 110 VAC BLOCK VALVE Seg B ae ELECTRONIC METER RET NA METER PROVIDING COUNTER VALVE N 7 PUL
5. Tachometer generator which is permanent magnet tachometer generator should be in an explosion proof housing The transmitter shall be actuated by the meter output drive and gear train within the housing providing dc voltage output propotional to meter flow rate Meter generator ratio 1 1 1 2 1 4 48 1 9 6 Ingress protection IP 65 6 2 2 Rate of flow indicator Rate of flow indicators should be used in conjunction with tachometer generators Mounting Panel mounted Scale range As specified Full scale 1 5 V Accuracy 2 of full scale 6 2 3 Pulse transmitter Pulse transmitter is used to transmit electronic pulses from a meter register to a remote display electronic counter or any data system Housing Die cast explosion proof Class 1 Group IIA UL or equivalent certified Pulse frequency 1 or 10 pulses per revolution of input shaft Swith type SPST Speed 0 to 3000 pulses per minute Temperature range 30 C to 70 C Leads 0 75 Sq mm min 15 Oct 1996 IPS M IN 240 Connection M20 x 1 5 gland Ingress protection IP 65 6 2 4 High frequency pulse generator High frequency pulse generator is device used to mechanically link the output shaft of the meter to the register and to provide an electrical output signal proportional to unit volume Frequency 0 5000 cycle per second Max Amplitude 0 10 volt Temperature range 30 C to 70 C Connection M20 x 1 5 gland Enclosure Explosion proof
6. Class 1 Group IIA Zone 1 and weather proof 6 2 5 Photo Electric pulse transmitter Photo electric pulse transmitters are devices that convert meter output shaft revolution into high resolution electrical pulses to drive electronic counters electronic combinator flow rate indicator through frequency convertor etc Frequency output 1 pulse revolution or 1000 pulse revolution Ingress protection IP 65 Operating range 30 C to 70 C 6 2 6 Pulse totalizer Pulse totalizer is simply a pulse counter which may be connected to a pick up coil or other compatible transducer It shall accept high frequency pulses and divide it by 1 10 100 or 1000 so that display shall be 1 1 10 1 100 or 1 1000 of the total pulses received Frequency range 0 to 6 5 kHz Accuracy 1 pulse Count capacity 999 999 Power requirement 110 15 50 Hz 24 Vdc Temperature range O to 70 five digit thumb wheel type switch may be provided for setting system factor into the totalizer so that the read out is automatically modified in engineering units 6 2 7 Combinating totalizer pulse combinator A digital combinator shall provide running summation of total pulses received simultaneously from pulse producing flow meters combines inputs digitally and displays the sum on six digit resettable totalizer selector switch should be provided that enables each input signal to be connected to remote proving totalizer Number of inputs 4 8 or
7. 10 inputs Accuracy 1 count per channel Pulse voltage level 3 to 24 volt peak to peak Count capacity 6 digit mechanically resettable with reset lock 16 Oct 1996 IPS M IN 240 Temperature range O to 70 Power requirement 110 15 50 Hz 24 V dc 6 2 8 Prover totalizer Prover totalizer should be self contained electronic counter which should be connected to pick up coil or other compatible transducers Prover input circuitry shall gate the input on and off Frequency range 0 6500 Hz Accuracy 1 count Count capacity 6 digit or as otherwise specified Power requirement 110 15 50 Hz 24 V dc Temperage range 30 C to 70 C Start stop switch Toggle switch to disable the input or test signal in stop position Reset switch Push button on front panel 6 2 9 Temperature compensating totalizer This totalizer shall provide temperature compensation using a temperature signal from a resistance type temperature probe to correct pulse inputs from the flow meter Accuracy 1 count Probe accuracy 0 25 C Power requirement 110 V ac 15 50 Hz 24 Vdc Temperature range 0 C to 70 Frequency 0 2500 Hz Wetted parts of probe Stainless steel 6 2 10 Remote ticket printer Remote ticket printer shall receive signals from a single remote location total the pulses and on command print the data on a ticket A common pulse transmitter should be used for signaling Specifications Voltage 110
8. bidirectional small volume prover must be constructed so that the full flow of the stream passing through the meter being proved will pass through the prover 7 3 1 Equipment The small volume prover must be suitable for the intended fluids pressures temperatures and type of installation The materials used must be compatible with the fluid stream and the location where the prover will be installed small volume prover will normally consist of the following elements a A precision cylinder b Adisplacer piston spheroid or other fluid separation device c A means of positioning and launching the displacer upstream of the calibrated section d Adisplacer detector or detectors e A valve arrangement that allows fluid flow while the displacer is traveling from one position to the opposite position f Pressure measurement devices g Temperature measurement devices 19 Oct 1996 IPS M IN 240 h Instrumentation with timers counters and pulse interpolation capability 7 3 2 Materials and Fabrication The materials selected for prover shall conform to applicable codes pressure ratings corrosion resistance and area classifications The calibrated volume measurement section of the prover located between the displacer position sensors must be designed to exclude any appurtenances such as vents or drains Flanges or other provisions should be included for access to the inside surfaces of the calibrated and pr
9. five rate of each flow Positive displacement meters shall be tested with mechanical registration equipment attached The testing medium shall be either water subject to Purchaser Approval kerosene or other liquid approved by the Purchaser 10 2 2 Provers Each prover shall be calibrated by the water draw method in accordance with API Manual Chapter 4 Section 9 latest edition calibration repeatability for the prover volume shall be within 0 02 for three consecutive round trips plus one additional round trip at rate change of 25 percent 10 2 3 Hydrostatic testing The hydrostatic testing shall be done by means of approved liquids All ancillary pipe work such as drain and vent system shall be included Continuous recording of pressure and ambient temperature shall be provided during the test All internal valves shall be in open position and end of piping shall be closed by blind flanges or threaded plugs Test pressure shall be 1 5 x design pressure Minimum stand time at test pressure shall be two hours or more All instrumentation shall be removed or isolated during this test 10 2 4 System Each assembled metering station shall be connected up to the associated panels and functional test with approved liquid carried out covering the following Correct function of prover equipment Correct function of local prover panel Correct function of pulse registration and other instruments Remote control indication of meter s
10. spin the meter too fast The following specifications shall be used for air eliminators Max capacity 10 up to 1000 m3 hr Body material Welded steel Flange bore The size shall follow the meter size 4 2 2 Rotary positive displacement meters In principle the rotational velocity of a rotary PD meter is proportional to the number of times the fluid is entrapped into the meter and passed through it 4 2 2 1 Rotary PD meter bodies shall be generally in carbon steel stainless steel or as otherwise specified Material of Construction Outer housing Cast steel Ferrous and cover Hard anodized aluminum Non ferrous Oct 1996 IPS M IN 240 Inner unit Cast iron Ferrous Housing Hard anodized aluminum Non ferrous 4 2 2 2 The internal parts of the meter shall be manufactured to tight tolerances that must be maintained over the life of the meter Where more than one part rotates the parts shall be geared together 4 2 2 3 Material of measuring mechanism shall be as follows unless higher grades are specified Rotor and block Close Grained Cast Iron Aluminum Bearings Stainless Steel Pins and rollers Stainless Steel Cam shaft Steel Gears Steel Nodular Iron Blades Anodized High Tensile Aluminum Alloy Close Grained Cast Iron Bushings Sintered Iron Packing gland Steel and Buna Steel and Teflon or Steel and Viton Can be Used on Special Cases 4 2 2 4 The double case rotary type PD meters shall be straight through typ
11. system explosion proof type and fitted with local and remote operating facilities 7 1 7 The 4 way valve shall be flanged constructed with pressure rating of not less than 150 Ib ANSI The 4 way valve shall be fitted with mechanical position indicator and manually gear operated hand wheel 7 1 8 Prover should be supplied with one displacing device as minimum When elastomer spheroid is used as displacer it should be hydrostatically filled with water and glycol Material of sphere should be neoprene polyurethane or nitrile rubber according to the application For MTBE services Teflon may be used 7 1 9 The prover should be coated with external protective coatings such as primers paint mastic epoxies etc which can be applied to the prover exterior surface 7 1 10 The provers shall be externally insulated for temperature stability 7 1 11 Spades and spacer rings shall be provided on the inlet and outlets of the prover for maintenance purposes 7 1 12 The minimum nominal pipe thickness shall be 3 8 inch 7 1 13 Standard accessory equipment on all provers shall be as follows Fig 1 Two 150 mm diameter pressure gages 12 with 7 NPT isolation valves b Two industrial style thermometers with suitable temperature range and scale If temperature indication is in F the divisions shall be in degree and if it is in C the divisions shall be in 1 4 degree c One pressure relief valve with suitable isolation va
12. 1 SCOPE This Standard presents general and minimum requirements for materials used in metering stations of volumetric liquid measurement in petroleum industry Volumetric meters such as positive displacement meters turbine meters and ancillary equipment such as provers are covered in this Standard Note This standard specification is reviewed and updated by the relevant technical committee on Nov 2012 The approved modifications by T C were sent to IPS users as amendment No 1 by circular No 364 on Nov 2012 These modifications are included in the present issue of IPS 2 REFERENCES Throughout this Standard the following dated and undated standards codes are referred to These referenced documents shall to the extent specified herein form a part of this standard For dated references the edition cited applies The applicability of changes in dated references that occur after the cited date shall be mutually agreed upon by the Company and the Vendor For undated references the latest edition of the referenced documents including any supplements and amendments applies BSI BRITISH STANDARDS INSTITUTION BS 6169 Volumetric Measurement of Liquid Hydrocarbon Part 1 Displacement Meter System Other than Dispensing Pumps Part 2 Turbine Meter Systems BS 1414 Steel Wedge Gate Valves Flanged and Butt Welding Ends BS 1501 Steels for Pressure Purposes Plates Sheet and Strip BS 1503 Steel Forgings
13. 500 m Materials of Preamplifiers Elect Connection M20 x 1 5 Preamplifier case Suitable for use in hazardous locations Class 1 Groups IIB Zone 1 6 ACCESSORY EQUIPMENT 6 1 Mechanical Accessory Equipment 6 1 1 Strainers and air eliminators The strainers should be used only to remove solids that might otherwise damage a meter or create uncertainty of measurement Strainers used in crude oil services should be equipped with a coarse basket usually four mesh is sufficient to protect the meter straightening vane and prover from damage by foreign material The filter shall be of the basket type and designed to allow easy removal cleaning and replacement from the top of strainer The replacement of the filter should not necessitate draining the strainer chamber The strainer shall be equipped with an air release mechanism of the float type complete with valve The strainer housing shall be equipped with differential pressure gage and or differential pressure transmitter Material of Construction shall meet the piping material specification PMS The following material may be considered as a guide Body material Carbon steel pipe or rolled plate Flange Carbon steel raised faced per ANSI B 16 5 Basket material SS 304 or SS 316 or Carbon steel perforated plate 5 16 inch dia Holes on 3 8 inch Staggered centers 65 open area with adjustable handle for Hold down and easy removal of basket Closure Quick opening closu
14. SE SIGNAL LINE FLOW 12 SHIELDED CABLE METE ES TYPICAL BI DIRECTIONAL U TYPE SPHERE METER PROVER Fig 1 24 Oct 1996 IPS M IN 240 UPPER GAUGE GLASS AND SCALE DISPLACEMENT TUBE THERMOMETER POCKETS MANHOLE ALTERNATIVE BOTTOMS FILL A EMPTY COCKS P WEIR LADDER LOWER GAUGE GLASS AND SCALE VOLUMETRIC PROVER TANK Fig 2 25
15. agram consists of a Internal wiring of control panel b System interconnection wiring diagram c Control panel details and outline drawings d HMI graphic display 20 Oct 1996 IPS M IN 240 e Valves control logic and interlocking system schematic wiring diagram Proposed test procedures for approval 8 3 Final Drawings and Data Suppliers shall provide the following drawings and literatures in form of electronic and hard copy before delivery Final metering system details piping dimensional outline drawings and foundation plants sizing etc Final electrical wiring schematic diagram consisting of a Internal wiring of control panel b Final system interconnection complete with connection terminal Nos and type of cable c Panel details and dimensions d HMI graphic display e Valve control logic and interlocking system wiring diagram Codes and standards compliance certificates Installation operation and maintenance manuals Factory test certificates including test data and calculated results Illustrated and numbered parts list and two years running spare parts list As built P amp ID 9 GUARANTEES The supplier shall guarantee his equipment during commissioning and one year operation starting from the completion of seven days continuous service test in site at full load against the following defects as minimum All operational defects All material defects All constructio
16. al gear positive displacement 4 2 2 Rotary positive displacement ns 8 4 2 3 Oscillating piston positive displacement 10 4 2 4 Helical gear positive displacement meters bi rotor 10 TURBINE METERS Lus meget 11 GEER EE RE A E E 11 5 2 Turbine Meter Performance Data 12 5 3 Sensing Systems Pick Up Coils mv acannon 12 6 ACCESSORY EGOUIPMENT aa ak Ea RE 13 6 1 Mechanical Accessory 13 a STANS E EE E E E A E P 13 EA EE ETE EE ERE EEE ER EAE NEE ENEE 13 6 1 3 Inlet and outlet block 14 EE EE en 14 6 1 5 Meter registers and printers 14 EE RENE EE 15 6 2 Electrical and Electronic Accessory 15 621 Tachomeler einen 15 62 2 Mate Ol NACA eee 15 Ga ANSNES 15 6 2 4 High frequency pulse generator 16 6 2 5 Photo Electric pulse
17. asy to read figures Utilizing a geared drive with proper ratios the meter register shall record in practically any unit of liquid measure Specifications Number of figures Delivery display 5 Totalizer 8 Color of figures Black on white Reset Right hand knob Operating temperature range 40 C to 70 C Gearing 1 1 through 42 1 on request Cover Cast aluminum Wheels pinion and clutch Acetal resin 6 1 5 Meter registers and printers Meter register and printer combine to produce detailed records of fluid deliveries and transactions The printer shall accept proper sized carbon packs and receipt tickets They shall be accumulative or zero start Specifications Number of Figures Meter register 5 14 Oct 1996 IPS M IN 240 Meter register totalizer 8 Meter register printer zero start 6 Meter register printer Accumulative 7 Reset Right hand single reset knob Gearing 1 1 through 42 1 on request Cover and sub frame Cast aluminum Wheels pinions and clutch Acetal resin 6 1 6 Set Stop and control valve It shall consist of meter to close quantity control valve after predetermined quantity of liquid has been measured by the meter After preset quantity of liquid has been measured the set stop counter shall actuate the valve to close it in two stages Valve material Stainless steel or ductile Iron Valve operator Piston type 6 2 Electrical and Electronic Accessory Equipment 6 2 1 Tachometer generator
18. at higher operating viscosities The materials shall be suitable for process conditions The materials which should be used in fabrication of rotors are listed in Table 1 as a typical TABLE 1 TABLE OF MATERIAL OF OVAL METERS PARTS MATERIAL ROTORS BEARINGS SHAFT O RING SERVICE 316 St St Carbon S S 316 Buna n Chemical products crude oil Cast Iron Cast Iron S S 316 Buna n Oils petroleum products Cast Iron Carbon 5 5 316 Buna n Caustic soda 4 2 1 3 The rotors require bearings which shall be pressed into the body Bearings shall be hard carbon For high temperature applications special bearings shall be proposed 4 2 1 4 Oval gear meters 1 inch to 14 inches sizes shall be pressure and temperature limited by the flange ratings and the temperature ratings of the bearings and O ring material 4 2 1 5 Maximum temperature required for meter should be 120 C 4 2 1 6 Maximum pressure for stainless steel meter should be 14 bars Oct 1996 IPS M IN 240 4 2 1 7 In order to maintain service life of meter it shall be essential that right material be selected for outer housing as pressure vessels relative to respective pressure ratings 4 2 1 8 Low pressure meters up to 14 Bar shall have the single case construction and high pressure meters shall have double case construction 4 2 1 9 Sensing system shall employ driving magnets embedded in the rotor to rotate following magnet external to the f
19. ch can be supplied with either drain to zero bottom or with bottom glass weir The tank should be manufactured from heavy steel plate and should be lined with epoxy resin Fig 2 Sizes should be 100 200 500 1000 1500 2000 liters Primary measures shall be provided for calibrating volumetric provers and may be 20 40 60 100 200 liters capacity 7 3 Small Volume Prover Systems The small volume prover is available in several different configurations that allow continuous and uniform rate of flow All types operate on the common principle of the repeatable displacement of a known volume of liquid in the calibration section of a pipe or tube displacer travels through a calibrated section with its limits defined by one or more highly repeatable detectors The corresponding metered volume simultaneously passes through the meter and the whole number of pulses is counted Precise calculations are made using a pulse interpolation technique The two types of continuous flow small volume provers are unidirectional and bidirectional The unidirectional prover allows the displacer to travel and measure in only one direction through the proving section and has a means of returning the displacer to its starting position The bidirectional prover allows the displacer to travel and measure first in one direction and then in other and is capable of reversing the flow through the prover section Both unidirectional and
20. cified Rotor bearing types and materials of construction shall be stainless steel ball bearing tangston carbide sleeve bearings and graphite sleeve bearing 5 1 1 The body is where the rotor assembly and sensing system are mounted Vanes that are used to aid in characterizing the flow at the flowmeter inlet shall be welded into the body Meter housing shall be of non magnetic stainless or carbon steel When carbon steel is specified non magnetic stainless insert is used for containing the pickup coil Meter body SS 304 corrosive service Carbon steel petroleum service or SS 316 5 1 2 The rotor is the part of the turbine meter that rotates at a velocity that is proportional to the fluid flow Rotors shall be generally designed to be as light as possible The rotor shall contain the optimum number of blades properly contoured to provide desired torque and speed A light weight 11 Oct 1996 IPS M IN 240 stainless steel rim with small paramagnetic buttons should be provided for greater resolution of flow if required Rotor Rim type Hy mu 80 SS 304 SS 316 Rotor Blade type SS 430 SS 300 Stainless Steel 17 pH SS 316 5 1 3 Rotor bearings are the parts of meter on which the rotor rotates Turbine meter bearings shall be usually selflubricating The journal bearings shall be designed and selected to insure long service Bearings shall be made of cemented tungsten carbide and are finely lapped to smoothness of one or t
21. divides the volume being measured into segments separates each segment from the flowing stream momentarily then returns it to the stream and counts the segments This is accomplished by two spiral fluted rotors The spaces between the lobes of the rotors are the chambers in which the segments are momentarily isolated 4 2 4 1 Bodies shall be made of stainless steel and carbon steel Rotors shall be constructed of stainless steel or aluminum in smaller sizes and either carbon steel or aluminum in larger sizes Bearings shall be made of stainless steel 4 2 4 2 All meters of 14 bar and larger shall be of double case construction 4 2 4 3 The materials of construction for single case meters for up to 10 bars working pressure should be as follows unless higher grades are specified Outer housing Cast iron Counter base plate Aluminum Rotors Aluminum Rotor shafts Stainless steel or ground and polished Nitralloy Rotor bearings Ball bearing stainless steel Counter drive gears Stainless steel 10 Oct 1996 IPS M IN 240 Counter drive shaft Stainless steel Counter drive shaft bushing Carbon filled teflon 4 2 4 4 The materials of construction for double case meters should be as follows unless otherwise specified Outer housing Welded steel construction combining steel castings and rolled or drawn steel plate Counter base plate Aluminum for meters rated 150 psi steel for higher rating Measuring unit body and end covers Nickel cas
22. e meters Some versions may be designed for vertical mounting of the meter and 90 angle type meters 4 2 2 5 Rotary PD meters shall measure volumetric flows with an accuracy 0 1 to 0 2 percent rate 4 2 2 6 Rotation of the internal parts of the meter shall be mechanically coupled either by gears or by the shaft of one of the rotating parts external to the meter The rotation of the shaft may be sensed by transmitter that typically outputs pulse for each revolution of the shaft 4 2 2 7 Rotary PD meters should be provided with numerical counters with five figure reset and seven figure non reset totalizers and or six figure reset and eight figure non reset totalizers depending upon meter capacity Ten figure nonreset totalizing register plus one tenth and one hundredth indicator may be used as option 4 2 2 8 Rotary PD meters should be provided with direct geared calibrators not clutch type to enable meter factor adjustment The calibrator should be protected from dirt and foreign matter and may be sealed against unautorized tampering Standard manual calibrators should be linear infinitely variable non cyclical over 5 rang Adjustment in increment of 1 20 of 1 may be provided for manual adjusters 4 2 2 9 Rotary PD meters may be optionally provided with Automatic Temperature Compensators ATC with gravity selection facility Range of temperature compensation shall be 10 C to 150 C and specific gravity of 0 58 to 1 4 2 2 10 Sta
23. efore expected to be sufficiently flexible so that the users can adapt these standards to their requirements However they may not cover every requirement of each project For such cases an addendum to IPS Standard shall be prepared by the user which elaborates the particular requirements of the user This addendum together with the relevant IPS shall form the job specification for the specific project or work The IPS is reviewed and up dated approximately every five years Each standards are subject to amendment or withdrawal if required thus the latest edition of IPS shall be applicable The users of IPS are therefore requested to send their views and comments including any addendum prepared for particular cases to the following address These comments and recommendations will be reviewed by the relevant technical committee and in case of approval will be incorporated in the next revision of the standard Standards and Research department No 17 Street14 North kheradmand Karimkhan Avenue Tehran Iran Postal Code 1585886851 Tel 88810459 60 amp 66153055 Fax 88810462 Email Standards nioc ir Oct 1996 IPS M IN 240 GENERAL DEFINITIONS Throughout this Standard the following definitions shall apply COMPANY Refers to one of the related and or affiliated companies of the Iranian Ministry of Petroleum such as National Iranian Oil Company National Iranian Gas Company National Petrochemical Company and National Irania
24. el mesh 80 should be used for rotary PD meters Meshes of 4 10 20 40 100 200 may be used on special requirement 4 2 3 Oscillating piston positive displacement meter In principle the rate of flow is proportional to the rotational velocity of the piston which oscillates smoothly in circular motion between the two plane surfaces of top and bottom heads division plate which guides the travel of the piston in its motion separates the inlet and outlet ports 4 2 3 1 Materials of construction should be limited to those that exhibit the property of low expansion due to temperature changes The recommended material of the main parts and their temperature limits are shown in Table 2 as a typical TABLE 2 MATERIAL OF OSCILLATING PD METER PARTS MATERIAL BODY IRON STEEL ST ST 316 Piston Aluminum 135 C Aluminum 135 C TEFZEL 110 C Nl resist 150 C Nl resist 150 C Rubber 27 C Rubber 27 C Chamber Nl resist Nl resist S S 316 4 2 3 2 O ring shall be constructed of materials such as Viton BUNA N Neoprene and Teflon Materials of construction of each component must be compatible with the fluid being measured 4 2 3 3 The registers used with oscillating piston meters should read as liters Five figures for reset capacity and seven figures for totalizer capacity should be provided 4 2 4 Helical gear positive displacement meters bi rotor meter The principle of operation is simply that the meter
25. erun sections Care should be exercised to ensure and maintain proper alignment and concentricity of pipe joints Interna