Field Inspection Manual Part: 4-STP Section: 26 Page: 1 of 14 Type 52.11-13, 52.21-23, S2.20 Specialized test procedure Procedure for testing LPG bulk meters Application This test is applied to LPG bulk metering systems. Purpose This procedure covers the total inspection of a bulk meter for liquefied gases using a vapour displacement prover. Legislative references R.262, R.263 and R.268 (1) and (2). Correction factors, subscripts and other variable definitions Ctl Cpl Cps Cts Pe IVp IVm - Correction for the temperature of the liquid - Correction for the pressure on the liquid - Correction for the pressure on the steel - Correction for the temperature of the steel - Equilibrium Vapour Pressure - Indicated Volume in the Prover - Indicated Volume in the Meter Tp - Temperature of liquid in the prover Tm - Temperature of liquid in the meter Pp - Pressure in the prover Pm - Pressure in the meter CVm - Corrected meter volume CVp - Corrected prover volume
Field Inspection Manual Part: 4-STP Section: 26 Page: 2 of 14 Procedure Preliminary preparation Locate the prover away from traffic (if possible) and near power outlet. Ground the prover to a suitable ground point and to other equipment involved in the test (e.g., truck under test for mobile meters, or being used to return test product). Level the prover. Connect power supply and check if pump is operational. Connect the liquid return line to fitting on supply tank (liquid fill connection). Connect the delivery line from meter to prover inlet. Open all valves slowly in the following sequence: Truck vapour line valve Hose vapour line valve Prover vapour return valve Prover liquid return valve Liquid return line valve on hose Truck liquid loading valve Truck liquid delivery valve on hose Prover liquid valve (where truck delivery hose hooks up) Have truck driver open all other truck valves that would normally be open during regular deliveries (i.e., emergency shut-off, vapour release vent line, pump by-pass, etc.). Note: Prover inlet discharge and bleeder valves remain closed at this time. If any leaks occur, close valves immediately and correct the problem. For Neptune and Brooks meters, remove ATC cover and disengage ATC (put pin in uncompensated position). Partly fill thermometer well with light oil or antifreeze and insert thermometer. If there is more than one thermometer well, use the one in the strainer. Engage truck power take off (or start supply pump) and check for leaks and creeping of meter.
Field Inspection Manual Part: 4-STP Section: 26 Page: 3 of 14 Preliminary test run(s) Wet the prover. This is to wet the prover and stabilize its temperature. The listed drain times are not applicable. Check pressure difference between prover and supply tank during and after each run. If significant pressure difference occurs, the cause must be located and the condition corrected. Check the temperature at the meter and at the prover. If there is more than 1.5 C difference between the two temperatures then empty the prover and refill. Pump product back to supply tank. When the product is below bottom gauge glass, close discharge valve and shut off prover pump. Performance test Start supply pump or power take off. Open prover inlet valve to bring liquid level to slightly above zero. Close inlet valve and open prover bleeder valve to lower product level exactly to the zero line. Set the register to zero. Perform the minimum tests listed in the applicable IPO (at least one slow and one fast run). When making test runs, open the vapour line after some pressure has built up in the prover. This prevents liquid from coming back through the vapour return lines. Establish meter flow rate. Take temperature readings at the measuring chamber at four points during each test run. Take pressure readings at the measuring chamber for each test run. Take final indicated volume by the register at the end of each run. Turn supply pump off or have power take off disengaged immediately after the end of the run. After each run, record the prover volume, average temperature and pressure when the vapour spinner stops. For each run determine the corrected metered volume or CVm by applying Cpl m and Ctl m corrections to the registered meter volume, based on the recorded temperatures and pressures. For each run determine the corrected prover volume or CVp by applying Cpl p, Ctl p, Cps p and Cts p corrections to the recorded prover volumes, based on the recorded temperatures and pressures. Note: For vapour displacement provers, Cps is determined by testing at time of calibration. A chart or a formula is provided with the inspection certificate for the prover.
Field Inspection Manual Part: 4-STP Section: 26 Page: 4 of 14 Note: For Cts, since these provers are normally made of steel, use the formula: CCC = 1 + (TT 15) 0.0000335 The vale 0.0000335 is the cubical coefficient of thermal expansion for steel in the SI units (Ω/Ω/ C), therefore Tp must be measured in ºC. Note: For Cpl, follow API standard chapter 11.2.2M to establish this factor. See Tables 3a, 3b and 3c below for propane at 500, 505, and 510 kg/m³. Note: For Ctl, use ASTM-IP table 54 to determine the appropriate VCF (Volume Correction Factor) for the average observed temperature during the test run in the test well or the measured temperature in the prover. See Table 2 below for Ctl values for propane at 500, 505, and 510 kg/m³. For each run determine the over or under registration error as follows: % EEEEE rrrrrrrrrrrr = CC m CC p CC p 100% Check agreement between registrations.
Field Inspection Manual Part: 4-STP Section: 26 Page: 5 of 14 Equilibrium vapour pressure for light hydrocarbons (kpa absolute) 500 kg/m³ 510 kg/m³ Chart 1:: Vapour Pressure for LPG at 500, 505, and 510 kg/m 3
Field Inspection Manual Part: 4-STP Section: 26 Page: 6 of 14 Vapour pressure (Pe) at temperature (T) for LPG with a density of 500, 505, and 510 kg/m³ at 15 C Temp ( C) 500 kg/m³ (kpa abs) 505 kg/m³ (kpa abs) 510 kg/m³ (kpa abs) Temp ( C) 500 kg/m³ (kpa abs) 505 kg/m³ (kpa abs) 510 kg/m³ (kpa abs) -10 450.1 384.4 328.4 15 911.6 803.1 707.4-9 464.2 397.0 339.6 16 935.3 824.8 727.4-8 478.6 409.9 351.1 17 959.4 847.0 747.8-7 493.4 423.1 362.9 18 983.9 879.6 768.6-6 508.5 436.7 375.0 19 1008.9 892.7 789.8-5 524.0 450.5 387.4 20 1034.3 916.2 811.5-4 539.8 464.7 400.1 21 1060.2 940.1 833.6-3 555.9 479.3 413.2 22 1086.6 964.5 856.2-2 572.4 494.1 426.5 23 1113.4 989.4 879.2-1 589.3 509.3 440.2 24 1140.6 1014.7 902.6 0 606.5 524.9 454.2 25 1168.4 1040.4 926.5 1 624.1 540.8 468.6 26 1196.6 1066.7 950.9 2 642.1 557.0 483.3 27 1225.3 1093.4 975.7 3 660.5 573.7 498.3 28 1254.5 1120.6 1001.0 4 679.2 590.7 513.7 29 1284.2 1148.3 1026.8 5 698.3 608.0 529.4 30 1314.4 1176.5 1053.1 6 717.8 625.7 545.5 31 1345.1 1205.2 1079.8 7 737.7 643.9 562.0 32 1376.2 1234.3 1107.0 8 758.0 662.4 578.8 33 1407.9 1264.0 1134.8 9 778.7 681.3 596.0 34 1440.1 1294.2 1163.0 10 799.8 700.5 613.6 35 1472.8 1324.8 1191.8 11 821.3 720.2 631.6 36 1506.0 1356.0 1221.0 12 843.3 740.3 649.9 37 1539.8 1387.8 1250.8 13 865.6 760.8 668.7 38 1574.0 1420.0 1281.1 14 888.4 781.7 687.9 39 1608.8 1452.8 1311.9 15 911.6 803.1 707.4 40 1644.1 1486.1 1343.3 Table 1: Pe values (in kpa absolute) for LPG at 500, 505, and 510 kg/m³ at 15 C Values derived from API chapter 11, section 2, part 2 Note: kpa absolute = kpa gauge + 101.325 kpa gauge = kpa absolute 101.325
Field Inspection Manual Part: 4-STP Section: 26 Page: 7 of 14 Liquid Temperature Correction Factors (Ctl) for Propane with a Density of 500, 505, and 510 kg/m³ at 15 C Temp ( C) 500 505 510 Temp ( C) 500 505 510-15.0 1.0835 1.0818 1.0799 10.0 1.0148 1.0145 1.0141-14.5 1.0822 1.0805 1.0787 10.5 1.0133 1.0130 1.0127-14.0 1.0809 1.0793 1.0774 11.0 1.0119 1.0116 1.0113-13.5 1.0796 1.0780 1.0761 11.5 1.0104 1.0102 1.0099-13.0 1.0783 1.0767 1.0749 12.0 1.0089 1.0087 1.0085-12.5 1.0769 1.0754 1.0736 12.5 1.0074 1.0073 1.0071-12.0 1.0756 1.0741 1.0724 13.0 1.0060 1.0058 1.0057-11.5 1.0743 1.0728 1.0711 13.5 1.0045 1.0044 1.0043-11.0 1.0730 1.0715 1.0698 14.0 1.0030 1.0029 1.0029-10.5 1.0717 1.0702 1.0686 14.5 1.0015 1.0015 1.0014-10.0 1.0703 1.0689 1.0673 15.0 1.0000 1.0000 1.0000-9.5 1.0690 1.0676 1.0660 15.5 0.9985 0.9985 0.9986-9.0 1.0677 1.0663 1.0647 16.0 0.9970 0.9971 0.9971-8.5 1.0663 1.0650 1.0635 16.5 0.9955 0.9956 0.9957-8.0 1.0650 1.0637 1.0622 17.0 0.9940 0.9941 0.9942-7.5 1.0637 1.0624 1.0609 17.5 0.9925 0.9926 0.9928-7.0 1.0623 1.0611 1.0596 18.0 0.9909 0.9911 0.9913-6.5 1.0610 1.0597 1.0583 18.5 0.9894 0.9896 0.9899-6.0 1.0596 1.0584 1.0570 19.0 0.9879 0.9881 0.9884-5.5 1.0583 1.0571 1.0557 19.5 0.9863 0.9866 0.9870-5.0 1.0569 1.0558 1.0544 20.0 0.9848 0.9851 0.9855-4.5 1.0556 1.0544 1.0531 20.5 0.9832 0.9836 0.9840-4.0 1.0542 1.05391 1.0518 21.0 0.9817 0.9821 0.9825-3.5 1.0528 1.0518 1.0505 21.5 0.9801 0.9805 0.9810-3.0 1.0515 1.0504 1.0492 22.0 0.9786 0.9790 0.9796-2.5 1.0501 1.0491 1.0479 22.5 0.9770 0.9775 0.9781-2.0 1.0487 1.0477 1.0466 23.0 0.9754 0.9760 0.9766-1.5 1.0473 1.0464 1.0453 23.5 0.9739 0.9744 0.9751-1.0 1.0460 1.0450 1.0440 24.0 0.9723 0.9729 0.9736
Field Inspection Manual Part: 4-STP Section: 26 Page: 8 of 14 Temp ( C) 500 505 510 Temp ( C) 500 505 510-0.5 1.0446 1.0437 1.0426 24.5 0.9707 0.9713 0.9720 0.0 1.0432 1.0423 1.0413 25.0 0.9691 0.9697 0.9705 0.5 1.0418 1.0410 1.0400 25.5 0.9675 0.9682 0.9690 1.0 1.0404 1.0396 1.0386 26.0 0.9659 0.9666 0.9675 1.5 1.0390 1.0382 1.0373 26.5 0.9643 0.9650 0.9659 2.0 1.0376 1.0369 1.0360 27.0 0.9627 0.9635 0.9644 2.5 1.0362 1.0355 1.0346 27.5 0.9611 0.9619 0.9629 3.0 1.0348 1.0341 1.0333 28.0 0.9594 0.9603 0.9613 3.5 1.0334 1.0327 1.0319 28.5 0.9578 0.9587 0.9598 4.0 1.0320 1.0314 1.0306 29.0 0.9562 0.9571 0.9582 4.5 1.0306 1.0300 1.0292 29.5 0.9545 0.9555 0.9566 5.0 1.0292 1.0286 1.0279 30.0 0.9529 0.9539 0.9551 5.5 1.0277 1.0272 1.0265 30.5 0.9512 0.9522 0.9535 6.0 1.0263 1.0258 1.0252 31.0 0.9496 0.9506 0.9519 6.5 1.0249 1.0244 1.0238 31.5 0.9479 0.9490 0.9503 7.0 1.0235 1.0230 1.0224 32.0 0.9462 0.9474 0.9487 7.5 1.0220 1.0216 1.0210 32.5 0.9445 0.9457 0.9472 8.0 1.0206 1.0202 1.0197 33.0 0.9429 0.9441 0.9455 8.5 1.0191 1.0187 1.0183 33.5 0.9412 0.9424 0.9439 9.0 1.0177 1.0173 1.0169 34.0 0.9395 0.9407 0.9423 9.5 1.0162 1.0159 1.0155 34.5 0.9377 0.9391 0.9407 10.0 1.0148 1.0145 1.0141 35.0 0.9360 0.9374 0.9391 Table 2: Ctl values for LPG at 500, 505, and 510 kg/m³ at 15 C From ASTM-IP Petroleum Measurement Tables for Light Hydrocarbon Liquids, Table 54, April 1986
Field Inspection Manual Part: 4-STP Section: 26 Page: 9 of 14 Liquid Pressure Correction Factors (Cpl) for Propane with a Density of 500, 505, and 510 kg/m³ at 15 C Density at 15 C = 500 kg/m³ Press Press Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Pm Pe Pm Pe Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp (kpa) (psi) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) -20 to -15.1-15 to -10.1-10.0 to -5.1-5.0 to -0.1 0.0 to 4.9 50 7.3 1.00016 1.00017 1.00018 1.00020 1.00022 1.00024 1.00027 1.00030 1.00033 1.00037 1.00042 1.00048 100 14.5 1.00031 1.00034 1.00037 1.00040 1.00044 1.00048 1.00053 1.00059 1.00066 1.00075 1.00084 1.00096 150 21.8 1.00047 1.00051 1.00055 1.00060 1.00066 1.00072 1.00080 1.00089 1.00099 1.00112 1.00126 1.00144 200 29.0 1.00062 1.00067 1.00073 1.00080 1.00088 1.00096 1.00107 1.00118 1.00132 1.00149 1.00168 1.00192 250 36.3 1.00078 1.00084 1.00092 1.00100 1.00109 1.00120 1.00133 1.00148 1.00165 1.00186 1.00210 1.00239 300 43.5 1.00093 1.00101 1.00110 1.00120 1.00131 1.00144 1.00160 1.00177 1.00198 1.00222 1.00251 1.00286 350 50.8 1.00109 1.00118 1.00128 1.00140 1.00153 1.00168 1.00186 1.00207 1.00231 1.00259 1.00293 1.00333 400 58.0 1.00124 1.00134 1.00146 1.00159 1.00175 1.00192 1.00212 1.00236 1.00263 1.00296 1.00334 1.00380 450 65.3 1.00139 1.00151 1.00164 1.00179 1.00196 1.00216 1.00238 1.00265 1.00296 1.00332 1.00375 1.00427 500 72.5 1.00155 1.00168 1.00182 1.00199 1.00218 1.00239 1.00265 1.00294 1.00328 1.00368 1.00416 1.00473 550 79.8 1.00170 1.00184 1.00200 1.00219 1.00239 1.00263 1.00291 1.00323 1.00360 1.00404 1.00457 1.00519 600 87.0 1.00186 1.00201 1.00218 1.00238 1.00261 1.00287 1.00317 1.00352 1.00392 1.00441 1.00497 1.00565 650 94.3 1.00201 1.00218 1.00236 1.00258 1.00282 1.00310 1.00343 1.00380 1.00425 1.00476 1.00538 1.00611 700 101.5 1.00216 1.00234 1.00254 1.00277 1.00304 1.00334 1.00369 1.00409 1.00457 1.00512 1.00578 1.00657 750 108.8 1.00231 1.00251 1.00272 1.00297 1.00325 1.00357 1.00394 1.00438 1.00488 1.00548 1.00619 1.00703 800 116.0 1.00247 1.00267 1.00290 1.00316 1.00346 1.00381 1.00420 1.00466 1.00520 1.00584 1.00659 1.00748 850 123.3 1.00262 1.00284 1.00308 1.00336 1.00367 1.00404 1.00446 1.00495 1.00552 1.00619 1.00698 1.00793 900 130.5 1.00277 1.00300 1.00326 1.00355 1.00389 1.00427 1.00472 1.00523 1.00584 1.00654 1.00738 1.00838 950 137.8 1.00292 1.00316 1.00344 1.00375 1.00410 1.00450 1.00497 1.00552 1.00615 1.00690 1.00778 1.00883 1000 145.0 1.00307 1.00333 1.00361 1.00394 1.00431 1.00474 1.00523 1.00580 1.00646 1.00725 1.00817 1.00928 1050 152.3 1.00323 1.00349 1.00379 1.00413 1.00452 1.00497 1.00548 1.00608 1.00678 1.00760 1.00857 1.00972 1100 159.5 1.00338 1.00365 1.00397 1.00432 1.00473 1.00520 1.00574 1.00636 1.00709 1.00795 1.00896 1.01016 1150 166.8 1.00353 1.00382 1.00414 1.00452 1.00494 1.00543 1.00599 1.00664 1.00740 1.00829 1.00935 1.01060 1200 174.0 1.00368 1.00398 1.00432 1.00471 1.00515 1.00566 1.00624 1.00692 1.00771 1.00864 1.00974 1.01104 Table 3a: Cpl values for propane at 500 kg/m³ at 15 C From API CHAPTER 11.2.2M) 5.0 to 9.9 10.0 to 14.9 Note: Ensure that Pm and Pe are expressed in the same unit (i.e., kpa absolute or kpa gauge) 15.0 to 19.9 20.0 to 24.9 25.0 to 29.9 30.0 to 34.9 35.0 to 39.9
Field Inspection Manual Part: 4-STP Section: 26 Page: 10 of 14 Density at 15 C = 505 kg/m³ Press Press Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Pm Pe Pm Pe Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp (kpa) (psi) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) -20 to -15.1-15 to -10.1-10.0 to -5.1-5.0 to -0.1 0.0 to 4.9 50 7.3 1.00015 1.00016 1.00018 1.00019 1.00021 1.00023 1.00025 1.00028 1.00031 1.00035 1.00040 1.00045 100 14.5 1.00030 1.00033 1.00035 1.00038 1.00042 1.00046 1.00051 1.00056 1.00063 1.00070 1.00079 1.00090 150 21.8 1.00045 1.00049 1.00053 1.00058 1.00063 1.00069 1.00076 1.00085 1.00094 1.00106 1.00119 1.00135 200 29.0 1.00060 1.00065 1.00070 1.00077 1.00084 1.00092 1.00102 1.00113 1.00125 1.00141 1.00158 1.00180 250 36.3 1.00075 1.00081 1.00088 1.00096 1.00105 1.00115 1.00127 1.00141 1.00157 1.00175 1.00198 1.00224 300 43.5 1.00090 1.00097 1.00106 1.00115 1.00126 1.00138 1.00152 1.00169 1.00188 1.00210 1.00237 1.00268 350 50.8 1.00105 1.00113 1.00123 1.00134 1.00146 1.00161 1.00177 1.00196 1.00219 1.00245 1.00276 1.00312 400 58.0 1.00120 1.00129 1.00140 1.00153 1.00167 1.00184 1.00202 1.00224 1.00249 1.00279 1.00315 1.00356 450 65.3 1.00135 1.00146 1.00158 1.00172 1.00188 1.00206 1.00227 1.00252 1.00280 1.00314 1.00353 1.00400 500 72.5 1.00149 1.00162 1.00175 1.00191 1.00209 1.00229 1.00252 1.00279 1.00311 1.00348 1.00392 1.00444 550 79.8 1.00164 1.00178 1.00193 1.00210 1.00229 1.00252 1.00277 1.00307 1.00342 1.00382 1.00430 1.00487 600 87.0 1.00179 1.00194 1.00210 1.00229 1.00250 1.00274 1.00302 1.00334 1.00372 1.00416 1.00469 1.00530 650 94.3 1.00194 1.00210 1.00227 1.00247 1.00270 1.00297 1.00327 1.00362 1.00403 1.00450 1.00507 1.00574 700 101.5 1.00209 1.00226 1.00245 1.00266 1.00291 1.00319 1.00352 1.00389 1.00433 1.00484 1.00545 1.00617 750 108.8 1.00223 1.00241 1.00262 1.00285 1.00311 1.00342 1.00376 1.00416 1.00463 1.00518 1.00583 1.00659 800 116.0 1.00238 1.00257 1.00279 1.00304 1.00332 1.00364 1.00401 1.00444 1.00493 1.00552 1.00620 1.00702 850 123.3 1.00253 1.00273 1.00296 1.00322 1.00352 1.00386 1.00425 1.00471 1.00524 1.00585 1.00658 1.00744 900 130.5 1.00267 1.00289 1.00313 1.00341 1.00373 1.00408 1.00450 1.00498 1.00554 1.00619 1.00696 1.00787 950 137.8 1.00282 1.00305 1.00331 1.00360 1.00393 1.00431 1.00474 1.00525 1.00583 1.00652 1.00733 1.00829 1000 145.0 1.00297 1.00321 1.00348 1.00378 1.00413 1.00453 1.00499 1.00552 1.00613 1.00685 1.00770 1.00871 1050 152.3 1.00311 1.00336 1.00365 1.00397 1.00433 1.00475 1.00523 1.00579 1.00643 1.00719 1.00808 1.00913 1100 159.5 1.00326 1.00352 1.00382 1.00415 1.00454 1.00497 1.00547 1.00605 1.00673 1.00752 1.00845 1.00955 1150 166.8 1.00341 1.00368 1.00399 1.00434 1.00474 1.00519 1.00572 1.00632 1.00702 1.00785 1.00881 1.00996 1200 174.0 1.00355 1.00384 1.00416 1.00452 1.00494 1.00541 1.00596 1.00659 1.00732 1.00818 1.00918 1.01037 5.0 to 9.9 10.0 to 14.9 15.0 to 19.9 20.0 to 24.9 25.0 to 29.9 30.0 to 34.9 35.0 to 39.9 Table 3b: Cpl values for propane at 505 kg/m³ at 15 C From API CHAPTER 11.2.2M) Note: Ensure that Pm and Pe are expressed in the same unit (i.e., kpa absolute or kpa gauge)
Field Inspection Manual Part: 4-STP Section: 26 Page: 11 of 14 Density at 15 C = 510 kg/m³ Press Press Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Tm Pm Pe Pm Pe Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp Temp (kpa) (psi) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) ( C) -20 to -15.1-15 to -10.1-10.0 to -5.1-5.0 to -0.1 0.0 to 4.9 50 7.3 1.00015 1.00016 1.00017 1.00018 1.00020 1.00022 1.00024 1.00027 1.00030 1.00033 1.00037 1.00042 100 14.5 1.00029 1.00031 1.00034 1.00037 1.00040 1.00044 1.00049 1.00054 1.00060 1.00067 1.00075 1.00085 150 21.8 1.00043 1.00047 1.00051 1.00055 1.00060 1.00066 1.00073 1.00080 1.00089 1.00100 1.00112 1.00127 200 29.0 1.00058 1.00063 1.00068 1.00074 1.00080 1.00088 1.00097 1.00107 1.00119 1.00133 1.00149 1.00169 250 36.3 1.00072 1.00078 1.00085 1.00092 1.00100 1.00110 1.00121 1.00134 1.00149 1.00166 1.00186 1.00210 300 43.5 1.00087 1.00094 1.00102 1.00110 1.00120 1.00132 1.00145 1.00160 1.00178 1.00199 1.00223 1.00252 350 50.8 1.00101 1.00109 1.00118 1.00129 1.00140 1.00154 1.00169 1.00187 1.00207 1.00232 1.00260 1.00293 400 58.0 1.00116 1.00125 1.00135 1.00147 1.00160 1.00175 1.00193 1.00213 1.00237 1.00264 1.00297 1.00335 450 65.3 1.00130 1.00140 1.00152 1.00165 1.00180 1.00197 1.00217 1.00240 1.00266 1.00297 1.00333 1.00376 500 72.5 1.00144 1.00156 1.00169 1.00183 1.00200 1.00219 1.00241 1.00266 1.00295 1.00329 1.00369 1.00417 550 79.8 1.00159 1.00171 1.00185 1.00201 1.00220 1.00241 1.00265 1.00292 1.00324 1.00362 1.00406 1.00458 600 87.0 1.00173 1.00187 1.00202 1.00220 1.00239 1.00262 1.00288 1.00318 1.00353 1.00394 1.00442 1.00499 650 94.3 1.00187 1.00202 1.00219 1.00238 1.00259 1.00284 1.00312 1.00344 1.00382 1.00426 1.00478 1.00539 700 101.5 1.00201 1.00217 1.00235 1.00256 1.00279 1.00305 1.00336 1.00370 1.00411 1.00458 1.00514 1.00580 750 108.8 1.00216 1.00233 1.00252 1.00274 1.00298 1.00327 1.00359 1.00396 1.00440 1.00490 1.00550 1.00620 800 116.0 1.00230 1.00248 1.00269 1.00292 1.00318 1.00348 1.00383 1.00422 1.00468 1.00522 1.00585 1.00660 850 123.3 1.00244 1.00263 1.00285 1.00310 1.00338 1.00370 1.00406 1.00448 1.00497 1.00554 1.00621 1.00700 900 130.5 1.00258 1.00279 1.00302 1.00328 1.00357 1.00391 1.00429 1.00474 1.00526 1.00586 1.00657 1.00740 950 137.8 1.00272 1.00294 1.00318 1.00346 1.00377 1.00412 1.00453 1.00500 1.00554 1.00618 1.00692 1.00780 1000 145.0 1.00286 1.00309 1.00335 1.00363 1.00396 1.00433 1.00476 1.00525 1.00583 1.00649 1.00727 1.00819 1050 152.3 1.00301 1.00324 1.00351 1.00381 1.00416 1.00455 1.00499 1.00551 1.00611 1.00681 1.00762 1.00859 1100 159.5 1.00315 1.00340 1.00368 1.00399 1.00435 1.00476 1.00523 1.00577 1.00639 1.00712 1.00797 1.00898 1150 166.8 1.00329 1.00355 1.00384 1.00417 1.00454 1.00497 1.00546 1.00602 1.00667 1.00743 1.00832 1.00937 1200 174.0 1.00343 1.00370 1.00400 1.00435 1.00474 1.00518 1.00569 1.00627 1.00695 1.00774 1.00867 1.00976 5.0 to 9.9 10.0 to 14.9 15.0 to 19.9 20.0 to 24.9 25.0 to 29.9 30.0 to 34.9 35.0 to 39.9 Table 3c: Cpl values for propane at 510 kg/m³ at 15 C From API CHAPTER 11.2.2M) Note: Ensure that Pm and Pe are expressed in the same unit (i.e., kpa absolute or kpa gauge)
Field Inspection Manual Part: 4-STP Section: 26 Page: 12 of 14 Example 1: Determine the equilibrium vapour pressure Pe for 510 kg/m³ Propane The average temperature at test well during proving run is: 18.6ºC 1) Using Table 1 above, we note that the equilibrium vapour pressure Pe is: Pe = 768.6 kpa absolute at 18 C Pe = 789.8 kpa absolute at 19 C 2) Interpolating between the two temperatures, the Pe at 18.6 C is calculated as: PP = 768.6 + (789.8 768.6) (18.6 18) = 781.32 kkk (19 18) aaaaaaaa 3) Convert Pe value from kpa absolute to kpa gauge Pe gauge = Pe absolute 101.325 = 781.32 101.325 = 680 kpa gauge Example 2: Determine the liquid pressure correction factor Cpl. The measured flowing pressure at the meter is 1210 kpa gauge. 1) Calculate the pressure difference between the flowing pressure and the equilibrium vapour pressure. Gauge pressure at the meter: Vapour pressure from example 1: 1210 kpa gauge 680 kpa gauge Difference: 530 kpa 2) Enter Table 3c (density of 510 kg/m³) in the column for 15 to 19.9 ºC (since the average temperature was 18.6ºC). Move down vertically to the nearest corresponding pressure difference shown in the left hand column to determine the proper Cpl. In this case: Cpl = 1.00266 at a pressure differential of 500 kpa Cpl = 1.00292 at a pressure differential of 550 kpa 3) Interpolate between the two Cpl values to determine the correct Cpl. CCC = 1.00266 + (1.00292 1.00266) (530 500) = 1.00282 (550 500)
Field Inspection Manual Part: 4-STP Section: 26 Page: 13 of 14 Example of a test run Prover data Measuring system data: Vapour Displacement 1.5 inch Neptune measuring element Nominal Volume = 380 litres SWA 636 Rev. 1 Material = Steel Min 45 to 228 max L/min Cps = 1 + (Psi gauge reading x 0.000007666) Vehicle mounted Note: 1 kpa = 0.145038 Psi Liquid Controls register, Model LC III Reference Temperature = 15 ºC SWA: 2188 r-5 Test run data Test run data IVp = 378.75 litres IVm gross = 379.3 litres Tp = 3.8 ºC IVm net = 391.3 litres Pp = 450 kpa gauge Avg. Tm = 3.4ºC Pm = 1200 kpa gauge Flow rate = 165 L/min Calculations Calculations Ctlp @ 3.8 C from ASTM-IP table 54 = 1.0311 Ctlm @ 3.4 ºC from ASTM-IP table 54 = 1.0322 Pep @ 3.8 C from Table 1 = 510.6 kpa abs Pem @ 3.4 C from Table 1 = 504.5 kpa abs Pp - Pe = (450+101.3) 510.6 = 40.7 kpa abs Pm - Pe = (1200+101.3) 504.5 = 796.8 kpa abs Cplp from Table 3c = 1.0002 Cplm from Table 3c = 1.0032 Ctsp = 1+ (3.8-15) 0.0000335 = 0.9996 Cpsp = 1+ (450 kpa x 0.145038 psi/kpa x 0.000007666) = 1.0005 CVp = IVp * Ctlp * Cplp * Ctsp * Cpsp CVm = IVm * Ctlm * Cplm 378.75 x 1.0311 x 1.0002 x 0.9996 x 1.0005 379.3 x 1.0322 x 1.0032 CVp = 390.64 litres CVm = 392.77 litres In terms of registration, the % error is calculated as: % EEEEE rrrrrrrrrrrr = CC m CC p CC p 100% = (392.77 390.64) 100 = 0.54% over registration 390.64
Field Inspection Manual Part: 4-STP Section: 26 Page: 14 of 14 Check of the automatic temperature compensation (ATC) feature Net/Gross = 391.3 / 379.3 = 1.0316 and, therefore, The Corresponding Temperature = 3.6 ºC Temperature error = 3.4-3.6 = -0.2 ºC Revisions Revision 1 The purpose of this revision was to have the test procedure revised to better explain the required pressure and temperature corrections involved; added definitions section and supplemental procedure with charts to illustrate alternative method to use when determining the Cpl (correction for the pressure on the liquid) factor. Examples added to illustrate the calculation processes. Revision 2 The purpose of this revision is to: Revised Equilibrium Vapour Pressure (Pe in kpa absolute) Chart 1 to include densities of 500, 505 and 510 kg/m³ propane. Added table1 with Pe values (in kpa absolute) for 500, 505 and 510 kg/m³ propane. Added table 1 with Pe values (in kpa absolute) for 500, 505, and 510 kg/m 3 propane. Added table 2 with Ctl values for 500, 505, and kg/m 3 propane. Added table 3a with Cpl values for 500 kg/m 3 propane. Added table 3b with Cpl values for 505 kg/m 3 propane. Added table 3c with Cpl values for 510 kg/m 3 propane. Updated example calculations.