1、Manual of PetroleumMeasurement StandardsChapter 14Natural Gas Fluid MeasurementSection 6Continuous Density MeasurementANSI/API MPMS 14.6-1991SECOND EDITION, APRIL 1991REAFFIRMED, FEBRUARY 2012Manual of PetroleumMeasurement StandardsChapter 14Natural Gas Fluid MeasurementSection 6Continuous Density M
2、easurementMeasurement CoordinationANSI/API MPMS 14.6-1991SECOND EDITION, APRIL 1991REAFFIRMED, FEBRUARY 2012Date of Issue:August 5, 1998Affected Publication:API MPMS Chapter 14.6, Continuous Density Measurement, Second Edition, April 1991ERRATASeveral errata have been found in API MPMS Chapter 14.6
3、“Continuous Density Measure-ment,” dated April 1991, Second Edition. Known errata are listed below:Page 7, section 14.6.6.6.2.The second equation on this page, which is the first equation for variable CBW, is only for evacuated weight pycnometers. The CBW equation found on page 45 is only for air-fi
4、lled weight calculations, as described in section 14.6.6.6.3, on page 9.Page 25, section 14.6.14.8, steps c, d, and e.The conversion factors listed here should not be used. To obtain appropriate conver-sion factors with more significant digits, refer to the following document (or its successor): “St
5、andard for Use of the International System of Units (SI): The Modern Metric System” (IEEE/ASTM SI-10; 1997), IEEE Standards Coordinating Committee 14 and ASTM Committee E-43, published by Institute of Electrical and Electronics Engineers, Inc., 345 East 47th St., New York, NY 10017. This document ha
6、s replaced ASTM E380 and ANSI/IEEE Std. 268-1992.Page 41, equation.Datum pressure, Pd,is generally equal to 14.696 psia throughout the document, and is never equal to local atmospheric pressure. However, in the equation listed on page 41, Pdis equal to 0.0 psia.Page 42. The average water data shown
7、on this page is not relevant.Pages 42, 43, and 44.On page 42, CBWwas incorrectly calculated using the air-filled weight calculations, as described in section 14.6.6.6.3. It was not calculated using the 14.6.6.6.2 evacuated weight method. Additionally, the values for shown on pages 42, 43, and 44 are
8、 not correct. Futhermore, for the Test A and Test B Data tables, only Weigh No.s 2, 4, 10, 12, 17 are significant. The rest of the Weighs are of little use. See the following two tables for corrected values:In the above Test A and Test B tables, the following values also apply:Pd= 14.696 psia datum
9、pressure,Et= 2.88E-5 per degree Fahrenheit,rA= 0.001175 g/cm3for Test A calculated by using the air density equation on page 45 at 79F,rA= 0.001179 g/cm3for Test B calculated by using the air density equation on page 45 at 77F,CBW= 0.99985 for both Test A and Test B.Page 45.The equation for Ktis inc
10、orrect. The value 58.4772 should read: 58.47727. The last line of the equation should start with a division sign, not a multiplication sign. The corrected version is as shown here:Kt= isothermal compressibility of water at 14.696 psia and Tf, in degrees Celsius= 50.88496 + (6.163813 101)(Tf) + (1.45
11、9187 103)(Tf2)+ (20.08438 106)(Tf3) (58.47727 109)(Tf4) + (410.411 1012)(Tf5)1 + (19.67348 103)(Tf)(14.50377 106)Test ADataWeigh No.Pf (psia)Tf(F)Wf(g)M(g) (g/cm3)PVtp(cm3)PVp(cm3)2 50 76.1 2360.30 994.86 0.9972798 997.57 995.394 200 76.3 2360.90 995.46 0.9977180 997.74 995.5510 800 76.4 2363.47 998
12、.03 0.9995581 998.47 996.2812 1000 76.4 2364.36 998.92 1.0001724 998.75 996.5617 1500 76.6 2366.50 1001.06 1.0016708 999.39 997.19Test BDataWeigh No.Pf (psia)Tf(F)Wf(g)M(g) (g/cm3)PVtp(cm3)PVp(cm3)2 50 77.5 2360.26 994.76 0.9970810 997.67 995.454 200 77.5 2360.89 995.39 0.9975464 997.84 995.6210 800
13、 77.5 2363.46 997.96 0.9993975 998.56 996.3412 1000 77.5 2364.30 998.80 1.0000108 998.79 996.5717 1500 77.4 2366.45 1000.95 1.0015514 999.40 997.18rwtprwtprwtpPage 48.Replace the existing Kt equation with the same corrected version, above, for page 45.Replace the Ktpequation with the correct version
14、 as shown on page 45.Page 48, Table 7.Several values are incorrect, and have been updated here:Table 7Predicted Water DensityPressureWaterTemperatureGeorge S. KellIsothermalCompressibility of Water at 14.696 psia(Kt)psia bar C F 106/bar 1/psiKtp(1/psi)Wagenbreth(g/cm3)MPMS 14.6(g/cm3)77 5.31 0.00 32
15、.0 50.8850 3.5084 1063.5061 1060.999840 1.00005877 5.31 20.00 68.0 45.8914 3.1641 1063.1620 1060.998202 0.99839977 5.31 50.00 122.0 44.1727 3.0456 1063.0436 1060.988058 0.988245611 42.13 0.00 32.0 50.8850 3.5084 1063.4860 1060.999840 1.001922611 42.13 20.00 68.0 45.8914 3.1641 1063.1439 1060.998202
16、1.000077611 42.13 50.00 122.0 44.1727 3.0456 1063.0261 1060.988058 0.9898441465 101.01 0.00 32.0 50.8850 3.5084 1063.4547 1060.999840 1.0048741465 101.01 20.00 68.0 45.8914 3.1641 1063.1157 1060.998202 1.0027331465 101.01 50.00 122.0 44.1727 3.0456 1062.9990 1060.988058 0.9923743050 210.29 0.00 32.0 50.8850 3.5084 1063.3996 1060.999840 1.0102643050 210.29 20.00 68.0 45.8914 3.1641 1063.0660 1060.998202 1.0075793050 210.29 50.00 122.0 44.1727 3.0456 1062.9511 1060.988058 0.996988rwtrwt
