1、Manual of Petroleum Measurement StandardsChapter 3Tank GaugingSection 1BStandard Practice for Level Measurement of Liquid Hydrocarbons in Stationary Tanks by Automatic Tank GaugingTHIRD EDITION, APRIL 2018Special NotesAPI publications necessarily address problems of a general nature. With respect to
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21、I, 1220 L Street, NW,Washington, D.C. 20005, standardsapi.org.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative References . . . . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 General. . . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.2 General Precautio
24、ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.3 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 . 44.4 Use of ATGs for Custody Transfer or Inventory Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.5 Installation of ATGs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.
26、6 Remote Readout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 General Procedures for Initial Setting and Initial Verification of ATGs in the Field . . . . . . . . . . . . . . 135.1 Initial Requirements .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135.2 Reference Manual Level Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135.3 Reference Measurement Tape and
28、 Weight Certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145.4 Effect of Weather. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145.5 ATG Technology-Specific Considerations
29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145.6 Application-Specific Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Initial Setting of ATGs in the Field. . . . . . . .
30、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146.1 Ullage-based ATGs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146.2 Innage-based ATGs . . . . . . . . . . . .
31、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 Initial Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157.1 Introduction . . . . . .
32、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157.2 Verification Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167.3 Ini
33、tial Verification Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 Recordkeeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34、 . 189 Subsequent Verification of ATGs for Custody Transfer, Inventory Control, or Crude Oil Lease Tanks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189.2 Frequency of Subsequent Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189.3 Procedure for Subsequent Verification. . . . . . . . .
36、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199.4 Tolerance for Subsequent Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1910 Data Communication and Receiving. . . . . . . . . . . . . . . .
37、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Annex A (informative) Safety Precautions: Physical Characteristics and Fire Considerations . . . . . . . . . 20Figures1 Example of an ATG (Contact or Non-contact) Mounted on a Still Pipe Supported by Tank Bottom. . . . . 82
38、Example of an ATG (Contact or Non-contact) Supported by a Bracket Hinged to the Lower Tank Shell Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Example Installation of a Top Mounted ATG on a Fixed Roof Tank Withou
39、t Still Pipe . . . . . . . . . . . . . . . 104 Example Installation of a Top Mounted Innage-ATG on a Fixed Roof or Floating Roof Tank Without Still Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12T
40、ables1 Accuracy Requirements for ATGs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5vTank GaugingStandard Practice for Level Measurement of Liquid Hydrocarbons in Stationary Tanks by Automatic Tank Gauging 1 Scope This standard
41、covers level measurement of liquid hydrocarbons in stationary, aboveground, atmospheric storage tanks using automatic tank gauges (ATGs). The standard discusses automatic tank gauging in general, accuracy, installation, commissioning, calibration, and verification of ATGs that measure either innage
42、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
43、 15 pounds per square inch (in.) 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 Manual of Petroleum Measurement Standards. c) Measurement of the level in underground tanks or in pressurized tanks storing liquid hydrocar
44、bons. d) Conversion of the 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 sediment and water (S RP 2003. Maintenance 4.1.3All ATG equipment shall be maintained in a safe operating co
45、ndition, and the manufacturers instructions shall be complied with. Environment 4.1.4All ATGs shall be capable of withstanding the pressure, temperature, and other environmental conditions likely to be encountered in service. Sealing 4.1.5All ATGs shall be sealed to withstand the vapor pressure of l
46、iquid in the tank. Manual Gauging 4.1.6Manual tank gauging can be associated with exposure to immediately dangerous chemicals. When an ATG is checked or calibrated by manual gauging, the manual gauging should be done in accordance with MPMS Chapter 3.1A. Speed of Response 4.1.7ATGs should have suffi
47、cient dynamic response to track the liquid level during maximum rates of tank filling or emptying. 4.2 General Precautions The following general measurement precautions affect the accuracy and performance of all types of ATGs. They should be observed where they are applicable. Tank Temperatures 4.2.
48、1The tank temperature should be measured at the same time the tank level is measured. The tank temperature should be representative of the tank contents in accordance with MPMS Chapter 7. Recording Levels 4.2.2Level measurements should be recorded as soon as they are taken, unless the remote readout
49、 equipment of the ATG system automatically records the levels periodically. Opening and Closing Gauges 4.2.3The same procedures should be used to measure a tank level before the product transfer (opening gauge) and after the product transfer (closing gauge). 4 API MPMS 3.1B Compatibility 4.2.4All parts of the ATG in contact with the product or its vapor should be compatible with the product to avoid both product contamination and ATG corrosion. The ATG should be designed to meet the operating conditions. Settling Time 4.2.5Refer to MPMS Chapter 3.1A for guidance on settling time bef
