API MPMS 22.2:2005(2012) pdf download

API MPMS 22.2:2005(2012) pdf download.Manual of Petroleum Measurement Standards Chapter 22- Testing Protocol Section 2- Differential Pressure Flow Measurement Devices.
2.0 Definitions and Specific Terms
Thc dcfiniuons arc given to emphasizc and clariir the parucular meaning of terms as used in this document,
2.1 meter: A meter is the assembly of a primary clement, a dillerential producer holder with the upstream and downstream metcr tubes that will generate a ditTerential pressure when placed in a flow stream. The diflercntial pressure is monitored by secondary devicc(sl (section 2.6) to dense the flow rate.
2.1.1 meter asymmetry: Meter asynirnetry refers to the onentation of specific items in the meter in this document For example. it may refer to the position of’ the differential tap holes, or the orientation of supports within the meter which are not symmetrically placed throughout the diameter.
2.2 primary element or differential producer: The primary clement is defined as the ditlrcntial producer when placed in a flowing stream.
2.3 differential producer holder: The differential pro. ducer holder is defined as a pressure containing piping element used to contain arid position the differential producer and its associated diflerential pressure sensing taps in the piping system. An orifice fitting would be an example of such a devicc.
2.4 meter tube: The meter rube is defined as the straight sections of pipe, including all segnients that arc integral to the dilTerential producer holder, upstream and downstreani of the difl’erenual producer and the flow conditioner. if required.
2.5 meter tube internal diameter. 0. 0, D. or D:
In this document it ha,. bixn a,,sumcd Lh,jt the meter tube is circular. If the meter is used in a non-circular cross-sectional flow line or a non-circular desice is installed in a circular flow line, the manufacturer of the device must explain how the critical dimensions of the primary element would he defined and calculated. In addition, other m essary or critical upstream and downstreani flow conduit geometry and dimensions for the non-circular difiirential pressure producing flow measuring device must be defined by the manufacturer.
The published meter tube internal diameter (1)) is the inside diameter as published in standard piping handbooks. This internal diameter is used for determining the required meter run length (eg.. for orifice meters as stated in Tables 2- 7 and 2$ of API MPMS Chapter 14.3 Part 2. “Specification and Installation RequIrements”).
The measured meter tube diameter (L),) is the aserage inside diameter of the upstream section of the meter tube measured at a distance from the primary clement as defined by either a published standard or by the metei’s design and at the temperature of the meter tube (Tm) at the time of the internal diameter measurements. For example. an orifice diameter is nicasured at one inch upstream of the orifice plate.
2.5.1 area (m) andior diameter ratio, & The area ratio. m, is the minimum unresrncted area a( the primary dcment divided by the cross-sectional area of the meter tube.
[he area ratio has been simplified to a diameter ratio (B) for orifice and Venturi mctcm where the bore diameter of the primary element is simply divided by the meter tube internal diameter and is the square root of the actual area ratio.
2.6 s.condary devices: Secondary devices required for dcrcnmnin1 the flow through the primary element, which typically includes monituring differential pressure and the sensors defining the flowing conditions and fluid properties (pressure, temperature. density. etc.). Difkrentaal pressure tran’miflers arc scnsitPe to mounting position orientation To minimiie the effects of orientation, the transmitter must be zeroed after installation.