BS ISO 91:2017 pdf download.Petroleum and related products 一 Temperature and pressure volume correction factors petroleum measurement tables) and standard reference conditions.
API MPMS Chapter 1 1.l-2004/Adlunct to AS’TM 01250-04 and IP 200/04 provides general procedures for the conversion of Input data to generate the corrected values at the user specified bate temperature and pressure using the effect of temperature on the liquid (Cit.). the compressibility coefficw.iit (F,). the correction foe the effect of pressure on the liquid (CPI.). or the correction for temperature and pressure of a liquid (CTPL), in a form that is consistent with the computation procedures used to generate VCF values. Two sets ad procedures are given for computing the volume correction factor: one set roe data expressed in U.S. customary units (temperature in degrees Fahrenheit. pressure in pounds per square inch gauge), the other for the metric system of units (temperature In degrees Celsius, prelature in kilopascals). In contrast to API MPMS Chapter 1 1.1.1980/ASTM D1250.80/IP 200/80. the metric procedures require the procedure for U.S. customary units be used first to compute density at 60 F This value is then further corrected to give the metric output.
For density/weight/volume intraconverslon, reference shall be made to API MPMS Chapter 11.5 Part ito Part 3/Adjunct to ASTI4 01250-08 and IP 200/08. These standards provide conversion of riicasureinents ri-urn one system of units to another fur both in vacua and In air values.
For NGL and L.PG. reference shall be made to Al’l MPAIS Chapter 11.2.4 .2007/(;PA Technical Puhlkat Ion TP-27.2007. The implementation procedures describe how to cakulate the CTL given an appropriate density factor at bjsis temperature and an observed temperature, and calcubte the appt’opnate density factor at basis temperature given a relative density at an observed temperature. The implementation procedures are presented In pairs by base temperature. First, the procedures for Tables 23K and 24E of API MPMS Chapter ii.2.4.2007/GPA TP-27’2007 at a 60 F base temperature are given. The procedure for table 23K makes use of the procedure described in Table 24K. thus Table 24K Is presented first. These are followed by procedures for Table 54K and Table 53K at a base temperature of 15 ‘C, which themselves make use of the procedures in Table 23K and Table 24K; thesc In turn are followed by the procedures for Table 60K and Table 59K at a base temperature of 20 ‘C, which also make use of the procedures described in Table 23K and Table 24K.
To correct NGL and LPG volumes metered under pressure to the corresponding volumes under equilibrium pressure for the process temperature at the meter, reference shall be made to API MPMS Chapter 11.2.2-1986 (including Errata lune 1996) or API MPNS Chapter 1 1.2.2M1986 or if outside Ut the density range or these standards. API NPMS Chapter 11.2.1-1984 or API NPMS Chapter 1 12.1M-l964.
These methods require a knowledge of the equilibrium bubble point pressure (vapour pressure) at the measured conditions. However, the vapour pressure of the process liquid is generally not measured. The vapour pressure can also be calculated from compositional information, but the composetion is nut always measured for natural gas liquids (P4GLs). Therefore, a correlation for the vapour pressure of NGLs based upon normally measured propertles is required, and API MPMS Chapter 11,2.5.2007/GPA technical Publication TP.lSWil can be used for this purpose. The procedure given In API P4PNS Chapter 11.2.S/GPA TP-15 provides a simplified means of estimating equilibrium vapour pressures of various NGLs front a knowledge of the fluid’s relative density (60 ‘F/60 F) and process temperature. The intended application ad this procedure is to provide the values of P (equilibrium vapour pressure) required to determine the pressure effect contributions to volume correction factors as specified.
See Annex C for titles of petroleum measurement tables given in the 1980 editions of the API. ASTM. and IP volume correction factor standards, as well as a list of the documents that have superseded these documents.BS ISO 91 pdf download.