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API MPMS 5.4-2005 pdf free download

API MPMS 5.4-2005 pdf free download.Manual of Petroleum Measurement Standards Chapter 5—Metering Section 4—Accessory Equipment for Liquid Meters.
5.4.1 Introduction API Chapter 5.4 of the Manual of Petroleum Measurement Standards is intended to be a guide for the selection and application of accessory equipment that is used with liquid hydrocarbon meters to obtain accurate measurements and optimum service life. Accessory equipment is any device that enhances the utility of a measurement system. Selecting the kinds of accessory equipment that are described in this sec- tion depends on the function, design, purpose, and manner in which a specific measurement installation is to be used. This publication does not endorse or advocate the preferen- tial use of any specific type of equipment or metering system, nor does it intend to restrict the development of any particular meter, instrument, or accessory equipment. 5.4.2 Scope This section of API MPMS Chapter 5 describes the charac- teristics of accessory equipment that may be used with meters in liquid hydrocarbon service. Having a knowledge of these characteristics helps designers and operators of meter instal- lations provide satisfactory quantity measurement results. Certain minimum requirements for devices that monitor tem- perature, density, and pressure are discussed in this section. Most system hardware, such as non-control valves, vents, and manifolding, is not discussed in this section. 5.4.3 Field of Application The field of application of this section is all segments of the petroleum industry that require dynamic measurement of liquid hydrocarbons by meters. 5.4.4 Referenced Publications The current editions of the following API MPMS Stan- dards contain information applicable to this chapter: API Manual of Petroleum Measurement Standards Chapter 4.2, “Pipe Provers” Chapter 4.6, “Pulse Interpolation” Chapter 5.2 “Measurement of Liquid Hydrocarbons by Displacement Meters” Chapter 5.3, “Measurement of Liquid Hydrocarbons by Turbine Meters” Chapter 5.6, “Measurement of Liquid Hydrocarbons by Coriolis Meters” Chapter 7, “Temperature”
Chapter 9, “Density Determination” Chapter 11, “Volume Correction Factors” Chapter 12, “Calculation of Liquid Petroleum Quantities” 5.4.5 Selecting Accessory Equipment for Meters Accessory devices should be selected so that trouble will not arise from the following: a. Environment. Local climate extremes should be evaluated, and the installation should be protected accordingly. Electri- cal safety factors (including the hazardous area classification), electromagnetic and radio frequency interfer- ence, weatherproofing, fungus-proofing, and corrosion should be considered. b. Maintenance. Easy access should be provided for mainte- nance, and spare parts that have been recommended by the manufacturer should be obtained. c. Compatibility. The readout device or register must be compatible with the meter and its transmission system. d. Installation. All equipment must be installed and operated according to the manufacturer’s recommendations and must conform to all applicable regulations and codes. Isolating type flow conditioners, which produce a swirl-free, uniform velocity profile, independent of upstream piping configurations, are typically more sophisti- cated, expensive and higher pressure drop than simple straightening element type flow conditioners. However, in certain installations, they provide a performance advantage and should be considered. Flanges and gaskets shall be internally aligned, and gaskets shall not protrude into the liquid stream. Meters and the adjoining straightening section shall be concentrically aligned.
5.4.6 Shaft-driven (Mechanical) Accessories A variety of shaft-driven accessories are applied to dis- placement meters and sometimes to turbine meters. A mechanical linkage, usually a gear train, transmits force and motion from the rotating measurement element to the exterior of the meter, where the accessories are attached. Care should be exercised in selecting the number and type of accessories so that excessive torque, which can overload the meter, is avoided. This section discusses some of the accessory devices that are now being used.

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