API - MPMS 17.1
Manual of Petroleum Measurement Standards Chapter 17 - Marine Measurement Section 1 - Guidelines for Marine Cargo Inspection
|Publication Date:||1 January 1994|
17.1.1 Scope and Field of Application
These guidelines specify the policy and minimum recommended practices for the manual and automatic measurement, sampling, and accounting for bulk quantities of crude oil (including spiked, blended, and reconstituted crude oil) and petroleum products that are transferred from one port to another on marine vessels. (Where procedural differences exist, the specific petroleum product will be referred to by name in this publication.) The activities described in these guidelines include actions by producers, buyers, sellers, shore terminal operators, vessel owners and their crews, customs authorities, independent inspectors, and other parties with an interest in oil measurements. Certain vessel or terminal configurations and cargo characteristics may require extensive procedures not covered in this chapter.
The guidelines contained in this chapter apply to a simple voyage. A simple voyage consists of transporting petroleum cargo from one load port to one discharge port and involves a single marine vessel. The procedures used may be extended for use in multiple ports, for multiple or commingled cargoes, or for lightering operations.
Cargo calculations should be performed independently by the responsible parties and/or by their authorized representatives. The results of the quality determinations and quantity calculations should be compared and any differences resolved without delay. Each party involved in a custody transfer is responsible within his domain for contributing to a reconciliation of vessel and shore quantities and for seeking explanations for any discrepancies.
Any discrepancies relating to quality determinations and/or calculated quantities should be recorded and reported to all interested parties. This procedure may be accomplished by issuance of a Letter of Protest or Notice of Apparent Discrepancy. Every effort should be made to resolve discrepancies before the vessel departs.
The independent inspection report for the cargo custody transfer should be issued and distributed promptly.
These procedures are equally valid and applicable for either metric or English units of measurement, provided that the same types of units are used consistently.