API MPMS 19.3D:2001(R2012) pdf download.Manual of Petroleum Measurement Standards Chapter 19.3—Evaporative Loss Measurement
The purpose of this standard is to establish a uniform method for measuring evaporative deck-seam loss factors and deck-joint loss factors of mechanically-joined deck seams that are used on internal floating-roof tanks. These deck-seam loss factors and deck-joint loss factors are to be determined in terms of their loss rate at specified pressure differences across the deck seam or deck joint for certification purposes. It is not the purpose of this standard to specify procedures to be used in the design, manufacture, or field installation of deck seams or deck joints. Furthermore, equipment should not 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 equipment for a given application.
1 Scope
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 con- trolled 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.
3 Terminology
3.1 DEFINITIONS 3.1.1 Covered Floating Roof A floating roof that results from covering an external float- ing roof with a fixed roof at the top of the tank shell. This effectively converts the external floating roof to an internal floating roof, while retaining the external-type of floating- roof design. These floating roofs are typically designed in accordance with Appendix C of the API Standard 650, Welded Steel Tanks for Oil Storage . 3.1.2 Data Acquisition System (DAS) The equipment used and process of receiving signals from sensors, determining the values corresponding to the signals, and recording the results. 3.1.3 Deck That part of a floating roof that provides buoyancy and structure, and which covers the majority of the liquid surface in a bulk liquid storage tank. The deck has an annular space around its perimeter to allow it to rise and descend (as the tank is filled and emptied) without binding against the tank shell. This annular space is closed by a flexible device called a rim seal. The deck may also have penetrations, closed by deck fittings, that accommodate some functional or opera- tional feature of the tank.
API MPMS 19.3D:2001(R2012) pdf download
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