API MPMS 19.3D 2001 pdf free download

API MPMS 19.3D 2001 pdf free download.Manual of Petroleum Measurement Standards Chapter 19.3—Evaporative Loss Measurement Part D—Fugitive Emission Test Method for the Measurement of Deck-Seam Loss Factors for Internal Floating-Roof Tanks.
0 Introduction 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.
3.1.12 Indicator An instrument that displays or records signals received from a sensor. The indicator is typically constructed to express the signal in units that are useful to describe the observed value of measurement. For example, an electronic signal may be received by the indicator as volts, but then dis- played as pounds. An indicator may be incorporated into an electronic data acquisition system. An electronic data acquisi- tion system typically has the capability to be pre-programmed to record data at prescribed time intervals, to analyze the data that has been received, and to electronically store the results. 3.1.13 Instrument A device used in the measurement process to sense, trans- mit, or record observations. 3.1.14 Internal Floating Roof A floating roof that is not exposed to ambient environmen- tal conditions by virtue of being in a bulk liquid storage tank that has a fixed roof at the top of the tank shell. Internal float- ing roofs are thus distinguished from external floating roofs by their use of a fixed roof to protect the internal floating roof from environmental exposure. Internal floating roofs are typi- cally designed in accordance with Appendix H of the API Standard 650, Welded Steel Tanks for Oil Storage . 3.1.15 Product Factor A factor that describes the evaporative loss characteristics of a given liquid product. The product factor, vapor pressure function, and vapor molecular weight are multiplied by the sum of the equipment loss factors to determine the standing storage evaporative loss rate of a bulk liquid storage tank equipped with a floating roof. 3.1.16 Rim Seal A flexible device that spans the annular rim space between the tank shell and the perimeter of the floating roof deck. Effective rim seals close the annular rim space, accommodate irregularities between the floating roof and the tank shell, and help to center the floating roof, yet permit normal floating roof movement.