API MPMS 19.3 PART D:2001 (R2012)

This test method may be used to establish evaporative deck-seam loss factors and deck-joint loss factors for mechanically-joined deck seams that are used on internal floating-roof tanks. The test method involves passing a controlled flow rate of air through a test enclosure that is sealed to the top deck of a test pan. The test pan incorporates the test deck seam or test deck joint and contains a test liquid. The total hydrocarbon concentration in the air streams entering and leaving the test enclosure are measured over a range of pressure differences across the test deck seam. This standard specifies the test apparatus, the instruments, the test procedure, and the calculation procedures to be used. The variables that are to be measured are defined, and quality provisions are stipulated. The format for reporting the values of both the test results and their associated uncertainty are also specified. This standard may involve the use of hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.