API MPMS 19.3A:1997(R2007) pdf download.Manual of Petroleum Measurement Standards Chapter 19.3—Evaporative Loss Measurement
1 Scope
This test method may be used to establish evaporative loss factors for deck Þttings of external ßoating-roof tanks. The test method involves measuring the weight loss of a test assembly over time. This standard speciÞes the test apparatus, the instruments, the test procedures, and the calculation pro- cedures to be used. The variables that are to be measured are deÞned, and quality provisions are stipulated. The format for reporting the values of both the test results and their associ- ated uncertainty are also speciÞed. 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 Terminology
3.1 DEFINITIONS For the purposes of this standard, the following deÞnitions apply. 3.1.1 data acquisition: The process of receiving signals from the sensors, determining the values corresponding to the signals, and recording the results. 3.1.2 deck: That part of a ßoating roof which 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 Þlled and emptied) without binding against the tank shell. This annular space is closed by a ßexi- ble device called a rim seal. The deck may also have penetra- tions, closed by deck Þttings, which accommodate some functional or operational feature of the tank. 3.1.3 deck fitting: The device which substantially closes a penetration in the deck of a ßoating roof in a bulk liquid storage tank. Such penetrations are typically for the purpose of accom- modating some functional or operational feature of the tank. 3.1.4 external floating roof: A ßoating roof that is exposed to the ambient environmental conditions by virtue of being in a bulk liquid storage tank that does not have a Þxed roof at the top of the tank shell. External ßoating roofs are thus distinguished from internal ßoating roofs, which are located in tanks that do have a Þxed roof to protect the ßoat- ing roof from environmental exposure. External ßoating roofs are typically designed in accordance with Appendix C of API Standard 650.
API MPMS 19.3A:1997(R2007) pdf download
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