API MPMS 3.1B:2001 pdf download.Manual of Petroleum Measurement Standards Chapter 3—Tank Gauging
This standard covers level measurement of liquid hydro- carbons in stationary, aboveground, atmospheric storage tanks using automatic tank gauges (ATGs). The standard dis- cusses automatic tank gauging in general, accuracy, installa- tion, commissioning, calibration and veriÞcation of ATGs that measure either innage or ullage. It covers both intrusive and non-intrusive ATGs used for either custody transfer or inventory control. The standard also covers the requirements for data collection, transmission and receiving. This standard does not cover the following: a. Hydrocarbons having a Reid vapor pressure above 15 pounds per square inch absolute (100 kPa). b. Measurement of weight or mass with ATG equipment. This is covered in Chapter 3.6 and Chapter 16.2 of the Man- ual of Petroleum Measurement Standards . c. Measurement of level in underground tanks or in pressur- ized tanks storing liquid hydrocarbons. d. Conversion of tank level to liquid volume. This is covered in Chapter 12.1 of the Manual of Petroleum Measurement Standards . e. Measurement of temperature, sampling, density and sedi- ment and water (S & W), which are discussed in Chapters 7Ð 10 of the Manual of Petroleum Measurement Standards . Safety and material compatibility precautions should be taken when using ATG equipment. ManufacturersÕ recom- mendations on the use and installation of the equipment should be followed. Users should comply with all applicable codes and regulations, API Standards and NFPA 70 National Electric Code .
The reading of an ATG to be used for custody transfer application should agree with a certiÞed measurement instru- ment within ±1 mm or (± 1 / 16 inch) over the entire range of the ATG. The certiÞed measurement instrument should be traceable to the national standards and should be provided with a calibration correction table. The uncertainty of the ref- erence should not exceed 0.5 mm or ( 1 / 32 inch), with the cali- bration correction applied. The reading of an ATG to be used for inventory application should agree with a certiÞed measurement instrument within ±3 mm (± 1 / 8 inch) over the entire range of the ATG. The cer- tiÞed measurement instrument should be traceable to the national standards and should be provided with a calibration correction table. ATGs installed prior to the effective date of this document may not have factory calibration documentation. These ATGs are not required for re-test at the factory, but the installed accuracy of these ATGs should meet the requirements in 3.1B.7.3.3 for their intended application.
API MPMS 3.1B:2001 pdf download
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