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 Section2—Differential Pressure Flow Measurement Devices.
Application of the meter with pipe wall roughness outside these limits should be demonstrated by actual tests.
In this test protocol upstream and downstream lengths are defmed as straight lengths of pipe with no tees, branches. drain holes or any obstructions.
Spirally welded pipes are not pennissible as upstream and downstream meter tube Ibr the pcrfonnancc ventication tcsts.
4.0 Meter Tests
4.1 METERS TO BE TESTED
Meters are nonnally tested in the horizontal orientation. In general. testing meters in the vertical orientation may be difficult. I lowever, the meter should be tested in the orientation in which it is to be used. For meters installed vertically. ditTerential pressure readings may need to be corrected as defined by the manufacturer for the relative elevation of the pressure taps.
Two nominal line sizes are required for these tests. The smaller line size should be equal to 4 in. (100 mm) and the larger line size should be equal to or greater than 8 in. (200 mm). however, the actual sizes will be governed by the size range covered by the meter manufacturer and the how range capability of the test facilities.
It may be appropriate to test meters smaller than 4 in. (100 mm) diameter. The minimum 2:1 ratio between the sizes tested should be maintained.
For meters that are geometrically similar, test results for meters 4 in. (100 mm) and greater in size may be scaled up to larger line sizes without introducing additional uncertainty. However, test results should not be scaled down to meters less than 4 inches (100 mm) in diameter because of increased sensitivity to manufacturing tolerances.
For meters that have geometries designed to produce area ratios, tests shall be performed with two area ratios on either of the line sizes. The larger of the two required line sizes shall have the largest area ratio applicable for the meter to achieve a relatively low dilkrential pressure. The smaller line size shall have the smallest area ratio applicable for the meter to achieve a relatively high differential pressure.
All of the tests shall include at least ten different Reynolds number values spread evenly from the minimum value (±5%) to the maximum value (± 5%). The manufacturer will define the minimum practical flow rate for the meter. The ratio of the maximum to the minimum flow rate should be 3:1 or greater or as per specification claimed by the manufacturer. specifically when the claim of the meter rangeability (turndown) is less than 3:1. A further S intermediate flow rates will be selected to produce evenly spaced rates for the test. Each Reynolds number tested must have at least live data points to assure ± 0.5% repeatability is being achieved. The test results are valid within this Reynolds number range but not beyond. The test meter’s perfonnance shall be compared with the primary standard or refixence meter in the approved test facility (see Section 3.1).
Note: The laboratory should provide Reproducibility for the test stand over the range of Re values tested. This should be included in Section K. I Unccrtainty of the Tc’4 Facility”.
These lest results will verify whether the meter conforms to the uncertainty tolerance specified by the manufacturer. Acceptance of meter uncertainly for custody transfer is lefi to the Icons and conditions of the contract between the parties involved.
4.2 ACCEPTABLE TEST FLUIDS
Testing of difli.rcntial pressure flow meters can be conducted with various fluids provided that during the test following conditions are met:
The fluid is and will remain homogenous and in single phase during the lest; i.c.. gas shall not undergo condensation and liquid shall not cavitate. Liquid flows shall have no gas present (e.g., entrained air) in the test meter or any part of the test facility.
• Only Newtonian fluids are permitted.
• All physical properties of the fluid used shall be determined by direct measurements, by measurement and calculations based on an equation of state, or by appropriate and generally recognized industry standard. Fluids shall be characterized by the following properties:
density, viscosity (dynamic or kinematic), temperature, isentropic exponent of compressible fluid, and composition.
Meter manufacturers that wish to test meters for liquid or gas applications only, may do so by choosing to use either an incompressible fluid (liquid) or a compressible fluid (gas) only. In such cases, this restriction shall be explicitly stated in the results.
If a meter is to be tested in both liquid and gas flows then as long as the fluid type conforms to the Standard (Section 4.2) a combination of liquid and gas flow tests can be performed in different accepted facilities with different relevant fluids in order to achieve the required Re range.