1、Manual of Petroleum Measurement StandardsChapter 17.10Measurement of Cargoes on Board Marine Gas CarriersPart 1Liquefied Natural GasFIRST EDITION, APRIL 2014ISO 10976:2012 (Identical) Refrigerated light hydrocarbon fluidsMeasurement of cargoes on board LNG carriersSpecial NotesAPI publications neces
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21、eview cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually by API, 1220 L Street, NW, Washington, DC 20005.Suggested revisions are invited and should be submitted to the Stan
22、dards Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org.This American National Standard is under the jurisdiction of the API Subcommittee on Measurement Accountability. This standard is considered identical to the English version of ISO 10976. ISO 10976 was prepared by Techn
23、ical Committee ISO/TC 28, Subcommittee 5, Measurement of refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、 . . . . . . . . 12 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms, definitions and abbreviated terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、 . . . . . . . . . . . . . 23.1 Terms and definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.2 Abbreviated terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 General operating safety precautions and regulatory requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64.2 Electrical equipment classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.3 Electromagnetic disturbance. . . . . . . . . . . . . . . . . . . . . . . . .
28、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.4 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.5 Service conditions. . . . . . . . . . . . . . . .
29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.6 Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.7 Personnel p
30、rotection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.8 Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31、. . . . . . . . . . 85 Measurement systems and equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、 . . . . . . . . . . . . . . . . . . . . 85.2 Measurement equipment performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.3 Calibration and certification of measurement equipment . . . . . . . . . . . . . . . . . . . . . . . . . .
33、 . . . . . . . . . . . . . 95.4 Verification of measurement equipment between dry dockings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.5 Inspection of measurement equipment during transfer operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.6 Static m
34、easurement systems and equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.7 Dynamic measurement systems and equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 Measurement procedures. . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
36、.2 Static measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226.3 Gas-up and cool-down quantification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37、. . . . . . 276.4 Dynamic measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287 Cargo calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
38、. . . . . . . . . . . . . . . . . 287.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287.2 LNG volume determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297.3 LNG density determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Annex A (informative) LNGC design and marine operations . . . . . . . . . .
40、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Annex B (informative) Additional considerations for measurement on board an LNGC . . . . . . . . . . . . . . . . . . 37Annex C (informative) Examples of tank capacity tables for a spherical tank . . . . . . . . . . . . . . . . . . . .
41、. . . . . . . 42Annex D (informative) Calculation examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Annex E (informative) Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42、 . . . . . . . . . . . . . . 57Annex F (informative) Marine Measurement Witnessing Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61vFigures1 Radar (microwave) gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43、 . . . . . . . . . . . . . . 162 Float gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 Capacitance gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19A.1 Simplified longitudinal-sectional view of LNG carriers (not to scale). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30A.2 Simplified Cross-section of a Membrane Tank (Not to Scale) . . . . . . . . . . . . . . . . . . . . .
45、. . . . . . . . . . . . . . 31A.3 Simplified Cross-section of a Spherical Tank (Not to Scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32A.4 Vessel with IMO Type C tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
46、 . . . . . . . . . . . 32B.1 Draft readings - US customary units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38B.2 Draft readings - SI units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
47、. . . . . . . . . . . . . . . . . . . . 38D.1 Cargo calculation flow chart for quantity and energy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Tables1 LNG Measurement Equipment Performance Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48、 . . . . . . . . . . . . 9C.1 Example of section of a tank capacity table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42C.2 Example of section of a trim correction table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49、 . . . . . . . . . . 43C.3 Example of section of a list correction table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44C.4 Example of section of thermal correction table for a radar-type level gauge . . . . . . . . . . . . . . . . . . . . . . 44C.5 Example of section of thermal correction table for a tank shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45C.6 Example of section of a thermal correction table for float-type level gauge . . . . . . . . . . . . . . . . . . . . . . . 45C.7 Example of section of dens
