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API MPMS 4.5 2016 pdf free download

API MPMS 4.5 2016 pdf free download.Manual of Petroleum Measurement Standards Chapter 4.5 Master Meter Provers.
3.2 direct master meter proving method The method in which the proving of a line meter is performed indirectly by means of a prover in series with the master meter and the line meter. Both meters are proved using a common flowing stream at essentially the same time (either simultaneously or “back-to-back”). This method has a higher uncertainty than a direct method, simply by the introduction of a direct master meter into the procedures. However, it closely approximates the direct method because all of the testing is conducted using a common flowing stream at essentially the same time and conditions. 3.3 indirect master meter proving method This proving method requires that the line meter and a master meter be in series. The line meter is proved by comparison to the master meter whose meter factor (MF) was determined by a previous direct proving on a different flow stream and/or conditions. This method has a significantly higher uncertainty than the other methods because a displacement prover is not in series with the master meter and the line meter. 4 Applications Master meter proving is the method used to prove a line meter with a master meter. In order to minimize the uncertainties of this method, every attempt should be made to determine the master meter’s meter factor (MMF) by proving the master meter in the same fluid and flowing conditions that will be experienced by both the line meter and the master meter at the time of the line meter proving. In principle this method may have greater uncertainty than the direct proving method. Master meter proving is used when proving by the direct method can not be accomplished because of meter characteristics, logistics, time, space, safety, and cost considerations. For master meter proving of flow meters in allocation measurement applications, refer to API MPMS Chapter 20.1 for proving procedures.
A selected portable meter or a meter at a test station meeting appropriate custody transfer recommendation can be assigned as a master meter. The meter selected should be known, from proven performance, to be reliable and consistent, and capable of calibration to specified accuracy tolerances. In the absence of an in-situ prover, a master meter shall not be used for another function other than proving meters and shall not be in service when no meters are being proved. Master meters shall be properly maintained to minimize wear, corrosion, and build-up of material that may occur as a result of draining down lines and during periods of inactivity, especially if the meter is in portable service. If the master meter is in portable service, the inlet and outlet connections should be capped to protect against damage from corrosion and intrusion of foreign objects during storage. Care shall be taken to protect the meter during transportation, handling and installation. 6 Master Meter Factor (MMF) Proving the Meter 6.1 General Prior to proving with a master meter, a MMF shall be determined by the Direct Proving Method in accordance with applicable API standards. The prover shall be manufactured and calibrated to applicable API standards. The master meter shall not have been proved by another master meter. A volumetric master meter is proven utilizing a volumetric tank or displacement prover. A mass master meter is proven utilizing either a gravimetric tank prover or an inferred mass method. For additional information regarding gravimetric proving see Annex D. For master meters used on multiple fluid types, such as different grades of petroleum products or crude oils of different viscosities, a series of unique MMFs or MMF curves shall be determined as required for each fluid to achieve the required uncertainty. Proving data point criteria will include the full range of flow rates over which the line meter will be operated.

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