API MPMS 22.2:2005 pdf download.Manual of Petroleum Measurement Standards Chapter 22- Testing Protocol Section 2一Differential Pressure Flow Measurement Devices.
The testing protocol is limited to single-phase Newtonian fluid flow, and no consideration is givcn to pulsation effects. Further revisions of this document may include the testing of such meters in wct gas or multi-phase service and the effects of pulsation. This standard does not address testing protocols of those devices that operate on the principle of critical or choked how condition of fluids.
The testing protocol covers any flow meter operating on the principle of a local change in flow velocity, caused by the meter geometry. giving a corresponding change of pressure between two reference locations. There arc several types of ditli.rential pressure meters available to industry. It is the purpose of this standard to illustrate the range of applications of each meter and not to endorse any specific meter. The basic principle of operation of the flow measuring devices follows the physical laws relating to the conservation of energy and mass for the fluid flows through the device.
Any existing or later developed API MPMS document addressing a specific type or design of differential pressure flow measuring device will supersede the requirements of this document. An example of one such existing standard is API .‘1anuaI of Peirnkum Meassai’rnc’ng Standards. Chapter 14.3 “Concentric. Square-Edged On lice Meters.”
1.2 DIFFERENTIAL PRESSURE OR HEAD-TYPE FLOW METERS
The operating pnnciple ol a diltcrential pressure flow meter is based on two physical laws – the conservation of energy and conservation of mass, where changes in flow cross-sectional area andsor flow path produce a differential pressure. which is a function of the flow velocity, fluid path. and fluid properties. The following diagrams are presented as examples of some of the possible differential pressure devices. Other variations of meter designs are available and possible.
It is the intention of this Testing Protocol that no ditTerential pressure meter should be excluded. Therefore, the examples presented are of eligible meters and the document is not limited to these meter types alone.
2.1.1 meter asymmetry: Meter asymmetry refers to the orientation 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 element is defined as the dit1reniial producer when placed in a flowing stream.
2.3 differential producer holder: The diffirential producer holder is defined as a pressure containing piping clement used to contain and position the diliCrential producer and its associated differential pressure sensing taps in the piping system. An orifice fitting would be an example of such a device.
2.4 meter tube: The meter tube is defined as the straight sections of pipe. including all segments that arc integral to the differential producer holder, upstream and downstream of the difierential producer and the flow conditioner, if required.
2.5 meter tube internal diameter, D, D1, Dm, or Dr:
in this document it has been assumed that the meter tube is circular. If the meter is used in a non-circular cross-sectional flow line or a non-circular device is installed in a circular flow line, the manufacturer of the device must explain how the critical dimensions of the primary element would be defined and calculated. In addition. other necessary or critical upstream and downstream flow conduit geometry and dimensions for the non-circular differential pressure producing flow measuring device must be defined by the manufacturer.
API MPMS 22.2:2005 pdf download
