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API MPMS 2.8A Document Information:
Title
Manual of Petroleum Measurement Standards Chapter 2 - Tank Calibration Section 8A - Calibration of Tanks on Ships and Oceangoing Barges
American Petroleum Institute
Publication Date:
Mar 1, 1991
Scope:
This standard describes three methods for determining the total
and incremental volumes of liquids in tanks on ships, oceangoing
barges, and integrated tug barge units that have integral hull
tanks. The three methods are:
a. Liquid calibration.
b. Calibration by linear measurement.
c. Calibration from vessel drawings.
Paragraphs 2.8A.5 through 2.8A.7 describe procedures and
equipment for obtaining the field measurement data and suggestions
for the orderly and complete recording of field data. Paragraphs
2.8A.8 through 2.8A.10 include procedures for calculating the total
and incremental tank capacities from field data and suggestions for
the presentation of capacity tables. An example of a typical form
for such calculations is presented in Appendix A. Terms specific to
the maritime industry are defined in Appendix B.
For vessels having independent tanks, refer to other sections of
Chapter 2 for a similar discussion of horizontal, spherical,
upright, and other mobile tanks. For smaller coastal and inland
waterway barges, refer to Chapter 2, Section 7.
This standard addresses liquid calibration procedures pertaining
to ships. For details relating to metering systems, installation,
meter proving requirements, and other guidelines relating to liquid
calibration, refer to API Standard 2555.
The capacity tables should be computed so that volume is given
at standard conditions, that is, at 60°F (15°C). Appropriate liquid
and tape temperature corrections to 60°F (15°C) shall be applied.
API Standard 2543 and Chapter 17 should be consulted for
temperature determination in the marine environment.
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