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API RP 11V2-2008



Recommended Practice for Gas Lift Valve Performance Testing
Edition: 2nd
American Petroleum Institute / 01-Mar-2001 / 60 pages
Test site recommendations (Section 3): This section outlines the equipment needed for testing valves to determine the following:
a. Valve flow coefficients (Cv).
b. Pressure drop ratio factor (Xt).
c. Gas-lift valve performance curves.
Gas-lift valve probe tests (Section 4): This test method is outlined for determining the stem travel as pressure is applied over the bellows area. The test results are combined with
analysis (Appendix C) to allow the user to approximate the valve load rate over the range of expected practical application conditions. The test also defines the maximum effective
valve stem travel.
Flow coefficient test procedure (Section 5): The test procedure recommends test methods required to determine the flow coefficient (Cv) as a function of stem travel. The test results, combined with analysis, allow the user to approximate the valve flow coefficient (Cv) and pressure drop ratio factor (Xt) over the range of expected practical application conditions.
Gas-lift valve performance test methods (Section 6): This test procedure lists the test methods recommended to measure valve performance (flow) for upstream and downstream pressures and other controlled conditions.
Use of test data (Section 7): This section recommends the number of tests which should be performed in order to acquire sufficient data to develop a model or correlation describing valve performance at conditions other than those tested. Reference is made to methods described in Appendices A and B.

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