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2-inch Gas Flowmeter User Manual

1. 459 67 Calculating Gas Volume in Actual Cubic Feet As a point of reference for discussing volumetric units of gas one cubic foot 182 of gas at a pressure of 1 atmosphere assume 14 73 psia at a temperature of 60 F 519 69 R is considered one standard cubic foot scf A cubic foot of gas at any other pressure and temperature is referred to as an actual cubic foot acf and has no significance unless the conditions of pressure and temperature are known For example given 1 acf of gas at 200 psig at 100 F the volume of gas at standard conditions may be calculated with the following formula standard pressure x volume observed pressure x 1 ft standard temperature observed temperature 14 73xvolume 200 14 73 x1 ft 519 67 100 459 67 214 73 x 519 67 559 67 x 14 73 Volume 13 536 ft Volume Therefore 1 ft of gas at 200 psi and 100 F would occupy a volume of 13 536 ft if the pressure and tem perature were reduced to standard conditions of 0 psi 14 73 psia and 60 F Numerous laboratory tests have shown that the NuFlo Gas Flowmeter produces the same number of pulses per actual cubic foot of gas regardless of the pressure and temperature of the gas when operated within its rated range As a result the calibration factor can be specified in pulses per actual cubic foot If the readout equipment for a gas meter and the totalizer register in actual cubic feet the flow totalizer divisor is set to the nearest whole
2. CAMERON Measurement Systems NUFLO M d inch Gas Flowmeter User Manual Manual No 9A 100079591 Rev 01 O 2009 Cameron International Corporation Cameron All information contained in this publication is confidential and proprietary property of Cameron Any reproduction or use of these instructions drawings or photographs without the express written permission of an of ficer of Cameron is forbidden All Rights Reserved Printed in the United States of America Manual No 9A 100079591 Rev 01 September 2009 Table of Contents Section 1 introductionh 5 Operating PLINCIPIES naa AR 5 Specification S ee 6 Section 2 8Setup and Calibration 11 InStala MOM eT 11 Calibration of Electronic Readout 6 5555225 11 Absolute Pressure and Temperature ccssceeeeeeeeeeeeeeeneeeenneeeeseeeeeeeeeeeeeeseeeeneeeaaes 12 Calculating Gas Volume in Actual Cubic 5 22 12 Calculating Gas Volume in Standard Cubic 22 555 13 Determining the Divisor for Readout in Standard Cubic Feet 13 Effects of Supercompressibility oscar 14 Calibrating Equipment for Readout in Standard Cubic Feet P
3. seb uo aeunjeredua ui aBueyo 19943 Z z eimnbiy4 00c 4 eynjejeduue Bulmo 081 091 071 021 001 au yuey Buimo y noyua ye JANpe1adwaj l uoneueA 10114 08 09 x ebueyd 4 01 x BUeyo 4 02 x 9Bueu 4 0 9Bueu2 4 07 x ebueyd 34 05 Ov 0c jnopesy euunjoA sec ul J04J3 10 September 2009 18 OM auwes l eonpoud einssoud ui seBueuo enyebau pue sAnISO sjueuieunseeui euinjoA seb uo a nssaud ui eBueyo 32 14 z nI ISd eunssaJg BUIMO Y 0001 006 008 002 009 00S 007 00 002 001 0 x rebueyo sd oL x rebuey Isd 0z EE ME 4 9Dueu isd 0c N x ebueyo isd op x rebuey Isd 0g eisd sinssaig Buimo j4 a njosqv Nas 7 Bisd a1nssa1g ui uoneueA mopeay euinj oA sec ul 10413 Jo September 2009 20 September 2009 Section 3 Maintenance Because all internal components of the 2 in gas flowmeter are contained within a cartridge maintenance of this instrument is minimal Should a flowmeter fail the internal cartridge can be easily and quickly replaced in the field See the following procedure for removing and replacing cartridges See Tables 3 1 through 3 3 for ordering information Removing and Replacing Cartridges IMPORTANT Never disassemble or adjust a cartridge before installing it Each cartridge is precalibrated as
4. 69444 4 100000 1416000 b i s 1 1 1 1 4 1 1 1 1 4 1 1 1 1 4 1 1 1 x ox 50000 34722 2 566400 7 7 An ae er rice rp 13888 9 20000 10000 6944 4 A A ler e on coll 2000 1388 9 10 6 9 3 5 1 4 0 7 2000 13800 20 50 100 200 500 1000 345 690 1380 3450 6900 138 10 69 13 8 34 5 6 9 FLOVVING PRESSURE PSIG kPa Flovv rate ranges are based on 0 6 Sp Gr gas To determine capacity for other gases use where Qe G Q Flow rate on graph at operating pressure Sp Gr of other gas Flow rate for other gas 9 Figure 1 4 Low gas flow range September 2009 10 September 2009 Section 2 Setup and Calibration Installation The NuFlo Gas Flowmeter must be installed properly to prevent gas from swirling or experiencing other er ratic flow characteristics Figure 2 1 shows the proper installation of the meter Gasket 1 8 gt lt Gasket 5 Nominal Pipe Diameters 10 Nominal Pipe Diameters Temperature Flow Straightener Optional 5 Nominal Pipe N Diameters Gas Turbine q Meter Centering Rings 10 nominal pipe diameters is the minimum recommended upstream pipe length If a flow straightener is not used longer upstream pipe lengths may be required to minimize measurement uncertainty due to swirl or asymmetrical
5. a unit at the factory To replace a gas flowmeter cartridge perform the following steps 1 Remove the meter from the flowline Remove the magnetic pickup 2 3 Remove the retainer rings from each end of the housing 4 Press the cartridge out from either end of the housing IMPORTANT Do not press on the struts they may bend 5 6 11 12 Locate the point next to the hole in the top of the new cartridge This point indicates flow direction Position the new cartridge so that the flow direction indicated on the cartridge matches the flow direc tion indicated by the arrow on the flowmeter housing Snap the cartridge into place taking care to apply pressure only to the outer diameter of the cartridge Rotate the cartridge until the hole in the top lines up with the threaded hole in the housing used to at tach the magnetic pickup Install retainer rings into each end of the housing 10 Replace the magnetic pickup by screwing it in hand tight and securing the jam nut DO NOT OVER TIGHTEN Replace the flowmeter in the flowline ensuring that the flow direction arrow points in the proper direction For positive factor identification wrap the strap of the plastic tag bearing the factor around the con duit adapter thread the end of the strap through the hole in the tag and pull tight Cut off excess strap length September 2009 21 Flowmeter Assemblies The 2 in gas flowmeter assembly is ava
6. alizer to register in standard cubic feet 124 36x 14 73 x B0 459 67 22452 70 14 73 x 519 67 Divisor A divisor of 224 should be used for readings in tens of standard cubic feet a divisor of 2 245 should be used for readings in hundreds of standard cubic feet Effects of Supercompressibility The procedures described in this manual are applicable only when the flowing pressure and temperature remain constant at the values used in the computation If an application has a line pressure greater than 200 psig the operator should consider the effects of supercompressibility and adjust the divisor accordingly The equation for calculating a divisor that allows for supercompressibility is FCF xP x T Divisor 7 P x T x Fo where F supercompressibility factor Calibrating Equipment for Readout in Standard Cubic Feet Per Unit of Time The readout equipment s flow rate indicator and or analog rate output may also be calibrated for the flowing conditions to provide registration in standard cubic feet per unit of time The rate indicator will produce the full scale output selected when the gas turbine meter generates the fre quency corresponding to that output The following formula may be used to calculate the full scale frequency for any particular readout device FSFRxFCF xP x T TBCF xP x T FSF 14 September 2009 where FSF full scale frequency Hz FSFR full scale flow rat
7. conditions in which the customer user installs the product September 2009 CU M DAY MCFD SCFM 2832000 69444 4 100000 50000 34722 2 13888 9 20000 10000 6944 4 5000 3472 2 10 6 9 3 5 1 4 0 7 2000 13800 50 100 200 500 1000 690 1380 3450 6900 345 20 138 13 8 34 5 69 6 9 FLOVVING PRESSURE PSIG kPa Flovv rate ranges are based on 0 6 Sp Gr gas To determine capacity for other gases use where Qu G Flow rate on graph at operating pressure Sp Gr of other gas 0 Qe 25 G Flow rate for other gas Figure 1 2 High gas flow range September 2009 CU M DAY MCFD SCFM 2832000 69444 4 100000 34722 2 50000 13888 9 20000 6944 4 10000 5000 3472 2 56640 28320 20 13 9 4 1 1 1 J 1 1 1 1 4 1 1 1 1 1 1 1 1 10 6 9 3 5 A A ee n n n 2 1 4 1 0 7 2000 13800 20 50 100 200 500 1000 345 690 1380 3450 6900 138 10 69 13 8 34 5 6 9 FLOVVING PRESSURE PSIG kPa Flovv rate ranges are based on 0 6 Sp Gr gas To determine capacity for other gases use where Qs G Flow rate on graph at operating pressure Sp Gr of other gas Flow rate for other gas Qo Figure 1 3 Standard gas flow range September 2009 CU M DAY MCFD SCFM 2832000
8. e scf unit time FCF flowmeter calibration factor pulses acf P standard pressure 14 73 psia T flowing temperature R TBCF time based conversion factor seconds unit time P flowing pressure psia T standard temperature 519 67 R Example Calculate the full scale frequency for the readout in the previous example if the full scale flow rate is 1 500 Mscf D 1 500 000 x 124 36 x 14 73 x 80 459 67 SO RAS E QUU za OE OO day hr min FSF 389 78 Hz The readout device should indicate 1500 Mscf D flow with a 389 78 Hz signal fed into the flowmeter signal input Effects of Fluctuating Temperatures In some applications temperature does not remain constant and the operator must determine to what degree changing temperatures affect readout accuracy In many cases changes in temperature will not produce seri ous measurement errors and can often be ignored However where temperature changes are more extreme the user may recalibrate the readout equipment seasonally to offset the impact of wide ranges of temperature changes from summer to winter Figure 2 2 illustrates how fluctuations in flowing temperature cause errors in standard cubic feet To determine the effect of temperature changes on readout accuracy see the example below A 2 in gas turbine flowmeter is installed in a flowline operating at 70 psig at 80 F At standard conditions 1 ft of gas will occupy 5 539 ft Determine the eff
9. ects of a 10 change in temperature 10 of 80 8 therefore the maximum temperature is 88 F and the minimum temperature is 72 F At 88 F 1 0x 70 14 73 x 519 67 Standard Cubic Feet 5 458 14 73x 88 459 67 At 72 F 1 70 14 7 19 67 Standard Cubic Feet ont 5 7 a 5 622 14 73x 72 459 67 September 2009 15 At 80 F each actual cubic foot equaled 5 539 scf The percentage of change caused by increasing the flow temperature to 88 F is shown below Change 9 939 9 458 400 1 46 96 5 539 The percentage of change caused by decreasing the flow temperature to 72 F is shown below Change 3622 3 539 100 1 50 96 5 539 Effects of Fluctuating Pressures In some applications pressure does not remain constant and the operator must determine to what degree changing pressures affect readout accuracy Small changes in pressure can produce large errors in standard cubic feet especially at low flowing temperatures Figure 2 3 illustrates the effect of fluctuations in flowing pressure on standard cubic feet Note how the effect of changing pressure is much greater than the effect of changing temperature The overall effect of changing temperature and pressure is the algebraic sum of the individual effects To determine the effect of pressure changes on readout accuracy see the example below Example A 2 in gas turbine flowmeter is installed in a flowline operating at 70 psig at 80 F At
10. er Unit of Time 14 Effects of Fluctuating Temperatures cuina 15 Effects of Fluctuating 55 16 Section 3 Maintenance 21 Removing and Replacing CartridgeS cirio 21 Flowmeter ASSeMbli8S oooooocccccccococonococcccnncnnncncononnnnnornnnnnnnnrnrnrnnnnn nan nnn nn nnn nnn nhan nnn nnns 22 Spare Paris ee ee eine 22 ACTOS OMS nee A MEER eee ee 22 September 2009 iii September 2009 Section 1 Introduction The NuFlo 2 in Gas Flowmeter is a turbine flowmeter housed inside an insert element that is placed between two raised face flanges Continuous stud bolts draw the flanges together against the housing element and gaskets on the face of the flanges and meter body help ensure a competent seal Bolts nuts and gaskets are available as part of an optional hardware installation kit All internal components the rotor and shaft assembly bearings and setscrews are contained within a car tridge inside the meter Three different cartridges are available to accommodate high standard and low flow ranges see Figs 1 2 through 1 4 pages 3 through 5 An electromagnetic pickup screwed into the receptacle on the side of the meter produces the output signal Magnetic pickup Arrow indicating flow direction Centering ring 1 of 2 Retaining ring 1 of 2 Ca
11. flow Figure 2 1 Typical installation of an in line gas turbine meter minimum lengths Upstream and downstream sections are available in Schedule 40 and Schedule 80 pipe Calibration of Electronic Readout Equipment Before a flowmeter leaves the factory it is calibrated at multiple points within the flow range of the cartridge the factor is given in pulses per actual cubic foot acf This factor which 1s recorded on a calibration tag that is attached to the meter is then used to calibrate electronic readout equipment in the field Fluid measured by the gas turbine meter is compressible and is also affected by temperature changes The volumetric change caused by temperature and or pressure for any ideal gas follows the equation below P V P2V2 T T September 2009 11 Absolute Pressure and Temperature The equation above shows that the volume of gas is determined by pressure and temperature In this equation the pressure P is absolute pressure the flowing or observed gauge pressure plus the atmospheric pressure The commonly used unit of measure for absolute pressure is pounds per square inch absolute psia For this purpose atmospheric pressure is considered to be 14 73 psi Therefore Absolute pressure psia Observed gauge pressure psig 14 73 psi The absolute temperature in the equation above is expressed in degrees Rankine which is calculated as fol lows Degrees Rankine Flowing gas temperature F
12. g the flow totalizer for the calibration factor ofthe gas meter as previously described and multiplying the registration by 5 539 Example A 2 in gas turbine flowmeter with a calibration factor of 124 36 pulses per actual cubic foot is installed in a flowline operating at 70 psig at 80 F The flow totalizer divisor is set at 1 244 for registration in tens of actual cubic feet Assume that during a 24 hour period the totalizer registers 2 327 counts How many standard cubic feet were metered during this period Standard cubic feet 2327 x 10 x 5 539 128 893 Determining the Divisor for Readout in Standard Cubic Feet Ifthe flowing conditions are kept constant the multiplier for converting actual cubic feet to standard cu bic feet will also remain constant To simplify operations consider this when computing the divisor for the readout equipment and provide a direct readout in standard cubic feet The following formula can be used to determine the divisor for any given set of operating conditions FCFxP xT PxT f s Divisor September 2009 13 where FCF flowmeter calibration factor pulses acf P standard pressure 14 73 psia P flowing pressure psia T flowing temperature R T standard temperature 519 67 R Example A 2 in gas turbine meter has a calibration factor of 124 36 pulses per actual cubic foot and is installed in a flowline operating at 70 psi at 80 F Calculate the divisor for a flow tot
13. ilable in three different styles to accommodate standard high and low flow rates See Table 3 1 below for the part numbers for these assemblies Table 3 1 Gas Flowmeter Assemblies Part Number 9A 100003397 Gas meter assembly low flow range 9A 100003398 Gas meter assembly standard flow range 9A 100003399 Gas meter assembly high flow range Spare Parts The following spare parts are recommended for use with the NuFlo 2 in Gas Flowmeter Table 3 2 Spare Parts Pickup adapter extensions required with 300 600 and 900 ANSI flanges Retaining ring 9A 100020977 Retaining ring Accessories The following accessories are available for use with the NuFlo 2 in Gas Flowmeter The installation hard ware kit includes bolts nuts and gaskets for installing the meter in a pipeline Table 3 3 Accessories 22 September 2009 WARRANTY LIMITATION OF LIABILITY Seller warrants only title to the products soft ware supplies and materials and that except as to software the same are free from defects in workmanship and materials for a period of one 1 year from the date of delivery Seller does not warranty that software is free from error or that software will run in an uninterrupted fashion Seller provides all software as is THERE ARE NO WARRANTIES EXPRESS OR IMPLIED OF MERCHANTABILITY FITNESS OR OTHERWISE WHICH EXTEND BEYOND THOSE STATED IN THE IMMEDIATELY PRECEDING SENTENCE Seller s li ability and Buyer
14. number to the calibration factor The counter will then register actual cubic feet regardless of the flowing pressure and temperature Example Assume a 2 in gas flowmeter with a calibration factor of 124 96 pulses per actual cubic foot a flowline pressure of 70 psig and a temperature of 80 F If the readout equipment divisor is set for 125 totalizer measurements will be in actual cubic feet if the readout equipment divisor is set for 1 250 totalizer measurements will be in tens of actual cubic feet 12 September 2009 Calculating Gas Volume in Standard Cubic Feet Generally gas is measured in standard cubic feet rather than actual cubic feet Remember at standard condi tions 0 psi and 60 F standard cubic feet and actual cubic feet are equivalent To convert actual cubic feet to standard cubic feet use the following formula Actual Cubic Feet xP x T P xT Standard Cubic Feet where P flow pressure psia P standard pressure 14 73 psia T flowing temperature R T standard temperature 519 67 R Example How many standard cubic feet are in each actual cubic foot at a flowing pressure of 70 psig and a flowing temperature of 80 F 1 0x 70 14 73 x519 67 Standard Cubic Feet idi 14 73x 80 459 67 5 539 The example above shows that there are 5 539 scf in every actual cubic foot at the flowing conditions of 70 psi at 80 F The number of standard cubic feet may be obtained by settin
15. rtridge Figure 1 1 Flowmeter components Operating Principles The gas to be measured is flowed through the meter As the gas passes the rotor it impinges against the pitched rotor blade causing the rotor to spin at a speed directly proportional to the velocity of the gas stream As the rotor spins its blades interrupt the magnetic field set up by the pickup This interruption induces a voltage in the coil ofthe pickup The readout instrument senses this voltage pulse and converts it into a usable form that indicates gas volume September 2009 5 Specifications End Connections Working Pressure Nominal Calibration Factor Low Range Standard Range High Range Output Frequency Output Voltage Pressure Drop Linearity Repeatability Temperature Pickup Connector Conduit Connection Pressure Tap Compliances 2 in 50 8 mm Flowmeter installs between two raised face flanges 0 to 2220 psig 15 306 kPa 30 mV peak to peak at 5 Hz 900 mV peak to peak at 320 Hz Less than 1 in 24 5 mm water column at maxi mum rated flow 2 of reading 0 5 of reading 0 to 225 F 18 to 107 C CSA Certified Hazardous locations Class l Groups A B C D Div 1 ANSI 12 27 01 2003 Single Seal Certified by Cameron in compliance with pre qualified materials of NACE MR0175 ISO 15156 This certification does not imply or warrant the application of the product in compliance with NACE MR0175 ISO 15156 service
16. s exclusive remedy in any case of action whether in contract tort breach of warranty or otherwise arising out of the sale or use of any products software supplies or materials is expressly limited to the replacement of such products software supplies or materials on their return to Seller or at Seller s option to the allowance to the customer of credit for the cost of such items In no event shall Seller be liable for special incidental indirect punitive or consequential damages Seller does not warrant in any way products software supplies and materials not manufactured by Seller and such will be sold only with the warranties that are given by the manufacturer thereof Seller will pass only through to its purchaser of such items the warranty granted to it by the manufacturer MEASUREMENT SYSTEMS HOUSTON 281 582 9500 NORTH 1 800 654 3760 ASIA 603 2287 1039 EUROPE 44 1243 826741 HEAD OFFICE AMERICA PACIFIC MIDDLE EAST ms us c a m com ms asiapacificOc a m com amp AFRICA ms uk c a m com USA CANADA UK SCOTLAND CHINA UAE ALGERIA MALAYSIA INDIA KENYA www c a m com flo C CAMERON
17. standard conditions 1 ft of gas will occupy 5 539 ft Determine the effects of a 10 change in temperature 10 of 70 psig is 7 psig therefore the maximum pressure is 77 psig and the minimum pres sure is 63 psig At 63 psig 1 0x 63 14 73 x 519 67 Standard Cubic Feet 5 081 80 459 67 x14 73 At 77 psig 1 0x 77 14 73 x519 67 6 000 80 459 67 x 14 73 At 70 psig each actual cubic foot equals 5 539 scf The percentage of change caused by reducing the flowing pressure to 63 psig is shown below Si Changes 2961 9999 er 5 539 The percentage of change caused by increasing the flowing temperature to 77 psig is shown below Change 9 000 5 539 400 8 32 96 5 539 16 September 2009 When faced with varying flowing pressures consider the following alternatives 1 Sense the pressure on the flowline and correct the output from the flowmeter 2 Control the pressure to hold it constant within the limits of error that can be tolerated Alternative No 1 requires a pressure compensated readout or the use of a computer that can receive a sign representing pressure and compensate for the flowmeter signal Alternative No 2 is normally the least expensive since it requires only the installation of a pressure regulator in the flowline downstream of the flowmeter September 2009 17 40119 aues y eonpoud einjesedwe ui sobueyo annebau pue enn isogy sjueuenseeu

2-inch Gas Flowmeter User Manual

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