API MPMS 19.3H:1998(R2002) pdf download.Manual of Petroleum Measurement Standards Chapter 1 9.3-Evaporative LOSS Measurement
The purpose of this standard is to provide guidance for the administration of the API Tank Seals and Fittings Certifica- tion Program. Detailed requirements for this program are specified in other parts of MI’S Manual of Petroleum Mea- surement Standards (MPMS), Chapter 19.3, as listed in the reference section below. The standards of the API MPMS, Chapter 19.3, collectively describe the certification program by which petitioners may have the evaporative loss factors of proprietary floating-roof devices measured by laboratories that are registered with API for that purpose. It is not the purpose of the certification program to specify procedures to be used in the design, manufacture, or field installation of floating-roof rim seals or deck fittings. Further- more, equipment should not necessarily be selected for use solely on the basis of evaporative-loss considerations. Many other factors-such as tank operation, maintenance, and safety-are important in designing and selecting tank equip- ment for a given application.
1 Scope
This standard illustrates how other standards of the API MPMS, Chapter 19.3, referenced below, are integrated into the overall certification program, and it presents procedures for the evaluations to be performed by API under this pro- gram. These evaluations include review of the start-up docu- mentation for registered testing laboratories, approval of proposed protocol testing for individual devices, monitoring of the tests, and analysis of test results. This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the respon- sibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
3.1.16 standing storage evaporative loss: Loss of stored liquid stock by evaporation past the floating roof dur- ing normal service conditions. This does not include evapora- tion of liquid that clings to the tank shell and is exposed to evaporation when the tank is being emptied (withdrawal loss), nor does it include vapor loss that may occur when the liquid level is sufficiently low so as to allow the floating roof to rest on its support legs. This does include, however, evapo- rative losses from the rim seal, deck seams, and deck fittings.
3.1.17 vapor pressure function: A dimensionless fac- tor, used in the loss estimation procedure, that is a function of the ratio of the vapor pressure of the stored liquid to average atmospheric pressure at the storage location. The vapor pres- sure function, the stock vapor molecular weight, and the product factor are multiplied by the sum of the loss factors of the individual Aoating-roof devices to determine the total standing storage evaporative loss rate of a bulk liquid storage tank equipped with a floating roof.
API MPMS 19.3H:1998(R2002) pdf download
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