1、Manual of Petroleum Measurement Standards Chapter 14Natural Gas Fluid Measurement Section 6Continuous Density Measurement ANSI/API MPMS 14.6-1991 SECOND EDITION, APRIL 1991 REAFFIRMED, FEBRUARY 2012Manual of Petroleum Measurement Standards Chapter 14Natural Gas Fluid Measurement Section 6Continuous
2、Density Measurement Measurement Coordination ANSI/API MPMS 14.6-1991 SECOND EDITION, APRIL 1991 REAFFIRMED, FEBRUARY 2012 DateofIssue: August5,1998 AffectedPublication: APIMPMSChapter14.6,ContinuousDensityMeasurement, SecondEdition,April1991 ERRATA SeveralerratahavebeenfoundinAPIMPMSChapter14.6“Cont
3、inuousDensityMeasure- ment, ”datedApril1991,SecondEdition.Knownerrataarelistedbelow: Page7,section14.6.6.6.2. Thesecondequationonthispage,whichistherstequationforvariableC BW ,isonly forevacuatedweightpycnometers.TheC BW equationfoundonpage45isonlyforair- lledweightcalculations,asdescribedinsection1
4、4.6.6.6.3,onpage9. Page25,section14.6.14.8,stepsc,d,ande. Theconversionfactorslistedhereshouldnotbeused.Toobtainappropriateconver- sionfactorswithmoresignicantdigits,refertothefollowingdocument(orits successor):“StandardforUseoftheInternationalSystemofUnits(SI):TheModern MetricSystem”(IEEE/ASTMSI-10
5、;1997),IEEEStandardsCoordinatingCommittee 14andASTMCommitteeE-43,publishedbyInstituteofElectricalandElectronics Engineers,Inc.,345East47thSt.,NewYork,NY10017.Thisdocumenthasreplaced ASTME380andANSI/IEEEStd.268-1992. Page41,equation. Datumpressure,P d , isgenerallyequalto14.696psiathroughoutthedocume
6、nt,andis neverequaltolocalatmosphericpressure.However ,intheequationlistedonpage41, P d isequalto0.0psia. Page42. Theaveragewaterdatashownonthispageisnotrelevant. Pages42,43,and44. Onpage42,C BW wasincorrectlycalculatedusingtheair-lledweightcalculations,as describedinsection14.6.6.6.3.Itwasnotcalcul
7、atedusingthe14.6.6.6.2evacuated weightmethod.Additionally,thevaluesfor shownonpages42,43,and44are notcorrect.Futhermore,fortheTestAandTestBDatatables,onlyWeighNo.s2,4, 10,12,17aresignicant.TherestoftheWeighsareoflittleuse.Seethefollowingtwo tablesforcorrectedvalues: IntheaboveTestAandTestBtables,the
8、followingvaluesalsoapply: P d =14.696psiadatumpressure, E t =2.88E-5perdegreeFahrenheit,r A =0.001175g/cm 3 forTestAcalculatedbyusingtheairdensityequationonpage45 at79F ,r A =0.001179g/cm 3 forTestBcalculatedbyusingtheairdensityequationonpage 45at77F , C BW =0.99985forbothTestAandTestB. Page45. Thee
9、quationforK t isincorrect.Thevalue58.4772shouldread:58.47727.Thelast lineoftheequationshouldstartwithadivisionsign,notamultiplicationsign.The correctedversionisasshownhere: K t = isothermalcompressibilityofwaterat14.696psiaand T f ,indegreesCelsius = 50.88496+(6.163813 10 1 )( T f )+(1.459187 10 3 )
10、( T f 2 ) +(20.08438 10 6 )( T f 3 )(58.47727 10 9 )( T f 4 )+(410.411 10 12 )( T f 5 ) 1+(19.67348 10 3 )( T f )(14.50377 10 6 ) TestA Data Weigh No. P f (psia) T f (F) W f (g) M (g) (g/cm 3 ) PV tp (cm 3 ) PV p (cm 3 ) 2 50 76.1 2360.30 994.86 0.9972798 997.57 995.39 4 200 76.3 2360.90 995.46 0.99
11、77180 997.74 995.55 10 800 76.4 2363.47 998.03 0.9995581 998.47 996.28 12 1000 76.4 2364.36 998.92 1.0001724 998.75 996.56 17 1500 76.6 2366.50 1001.06 1.0016708 999.39 997.19 TestB Data Weigh No. P f (psia) T f (F) W f (g) M (g) (g/cm 3 ) PV tp (cm 3 ) PV p (cm 3 ) 2 50 77.5 2360.26 994.76 0.997081
12、0 997.67 995.45 4 200 77.5 2360.89 995.39 0.9975464 997.84 995.62 10 800 77.5 2363.46 997.96 0.9993975 998.56 996.34 12 1000 77.5 2364.30 998.80 1.0000108 998.79 996.57 17 1500 77.4 2366.45 1000.95 1.0015514 999.40 997.18 r w tp r w tp r w tp Page48. ReplacetheexistingK t equationwiththesamecorrecte
13、dversion,above,forpage45. ReplacetheK tp equationwiththecorrectversionasshownonpage45. Page48,Table7. Severalvaluesareincorrect,andhavebeenupdatedhere: T able 7PredictedWaterDensity Pressure Water Temperature GeorgeS.Kell Isothermal Compressibilityof Waterat14.696psia ( K t ) psia bar C F 10 6 /bar
14、1/psi K tp (1/psi) Wagenbreth (g/cm 3 ) MPMS14.6 (g/cm 3 ) 77 5.31 0.00 32.0 50.8850 3.5084 10 6 3.5061 10 6 0.999840 1.000058 77 5.31 20.00 68.0 45.8914 3.1641 10 6 3.1620 10 6 0.998202 0.998399 77 5.31 50.00 122.0 44.1727 3.0456 10 6 3.0436 10 6 0.988058 0.988245 611 42.13 0.00 32.0 50.8850 3.5084
15、 10 6 3.4860 10 6 0.999840 1.001922 611 42.13 20.00 68.0 45.8914 3.1641 10 6 3.1439 10 6 0.998202 1.000077 611 42.13 50.00 122.0 44.1727 3.0456 10 6 3.0261 10 6 0.988058 0.989844 1465 101.01 0.00 32.0 50.8850 3.5084 10 6 3.4547 10 6 0.999840 1.004874 1465 101.01 20.00 68.0 45.8914 3.1641 10 6 3.1157
16、 10 6 0.998202 1.002733 1465 101.01 50.00 122.0 44.1727 3.0456 10 6 2.9990 10 6 0.988058 0.992374 3050 210.29 0.00 32.0 50.8850 3.5084 10 6 3.3996 10 6 0.999840 1.010264 3050 210.29 20.00 68.0 45.8914 3.1641 10 6 3.0660 10 6 0.998202 1.007579 3050 210.29 50.00 122.0 44.1727 3.0456 10 6 2.9511 10 6 0.988058 0.996988 r w t r w t
