API MPMS 20.1:1993(R2011) pdf download.Manual of Petroleum Measurement Standards Chapter 20—Allocation Mesurement
1.5.2.2
Turbine Meters API MPMS Chapter5.3 discusses the use of turbine meters on single phase fluids. Single phase has generally been used to mean liquid only. API MPMS Chapter 5 may also be extended to liquid-liquid (oil and water) single phase measurement as in many allocation measurement schemes. The scope, field of application, system design, selection of meters, installation, opera- tion, and maintenance of turbine meters used in allocation measurement schemes are found in API MPMS Chapter 5.3, Paragraphs 5.3.1, 5.3.2, 5.3.3, 5.3.4, and 5.3.6. In allocation measurement schemes, the fluid characteristics may vary substantially and this variation will in tum affect the performance of the turbine meter.
1.5.2.3 Differential Pressure Devices
The most common differential pressure meter used in the allocation measurement of liquids is the flange tapped, concentric orifice type. The primary element should be con- structed and installed in accordance with the specifications contained in the latest revision of API MPMS Chapter 14.3. The differential pressure measuring device (transmitter or bellows chart recorder) shall be mounted below the orifice flange taps with the gauge lines sloping one inch per foot toward the secondary element. The gauge lines should be as short in length as possible and installed to prevent any vapor traps. Generally, on a bellows secondary element, the gauge lines should be connected to the top connections of the bellows assembly. However, depending on the liquid being measured, it may be preferable to connect to the bottom bellows connections.The orifice flange tap connections shall be located on the side of the meter tube at 90 degrees from vertical. Depending on the liquid being measured and ambient conditions, it may be necessary to use a seal system to prevent plugging, corrosion, freezing, and other problems of the gauge lines and secondary element. The seal system shall consist of seal pots installed atthe orifice taps with the pots, gauge lines, and secondary element filled with a suitable seal liquid. Accessory instrumentation to determine temperature, density, water content, and other factors shall be installed as necessary, depending on the application and type of measure- ment (for example, volumetric vs. mass) required. The calculations required to determine the volume of the measured liquid are also depen- dent upon the application and the type of measurement. Refer to API MPMS Chapters 14.3 and 14.8 to determine the appropriate calculations and procedures.
API MPMS 20.1:1993(R2011) pdf download
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