API STD 6FA-2018 pdf free download

API STD 6FA-2018 pdf free download.Standard for Fire Test for Valves.
4.1.5 Previous Fire tests Fire testing that has been completed and documented in accordance with requirements of previous editions of API 6FA during their validity shall be acceptable in meeting the requirements of this standard. 4.2 Test Valve 4.2.1 General The test valve shall conform to the applicable API product specification prior to the start of this fire test. The test valve shall include a port for the exclusive use of the relief valve (ltem 15 in Figure 1) to relieve the center cavity pressure to the atmosphere to protect against potential rupture of the valve. NOTE Any integral external pressure relief is in addition to the test port described above. 4.2.2 Symmetry Limitation Valves with asymmetric seat or body sealing systems intended for bidirectional installation shall be qualified by testing in both directions. NOTE The same valve may be refurbished and retested, or another, identical, valve may be tested in the other direction. Asymmetric valves intended for single-direction installation shall be marked accordingly and shall be tested in the direction of recommended installation. For valves with more than one closure member, if all seals and closure members are of the same design, testing of the upstream closure member in a single direction shall qualify all closure members in both directions. 4.2.3 Thermal Protection Limitation Valves shall not be protected with insulation material or heat shield of any form during testing, except where such insulation/heat shield is part of the design.
4.3.2 Test Instrumentation The test valve shall be equipped with thermocouples. Two thermocouples shall be directly exposed to the flame source at the locations specified in Figure 2 and Figure 3. For API 6A valves size 71/16 in. and smaller and API 6D valves NPS 6 and smaller, two calorimeter cubes shall be. located as shown in Figure 2. For larger size valves, three calorimeter cubes shall be used as shown in Figure 3. Thermocouples shall be located inside calorimeter cubes. The calorimeter cubes shall be made of carbon steel and conform to the dimensions specified in Figure 4. NOTE Dimensions shown in Figure 1 and Figure 2 may be taken from the valve or thermal protection device when the latter is part of the design.
4.4 Test Procedure General The valve shall be tested with water, with the closure member in the closed position and the stem and bore in the horizontal position. For valves with two or more closure members, the upstream closure member shall be in the closed position, and the other closure member in the open position. For valves with more than one closure member, the flame thermocouples and calorimeter cubes shall be located in the upstream closure member with that closure member in the closed position. NOTE 1 Thermocouples and calorimeter cubes are not required on the downstream closure member. NOTE 2 The end connection piping-to-valve joint leakage (flanged, threaded, or welded) is not considered a part of this test and is not included in the allowable external leakage in 4.4.2.2 and 4.4.3.2 for the test. It may be necessary to modify this joint to eliminate leakage. The valve shall be enveloped in flame having an average temperature from two flame thermocouples between 1 ,400 °F and 1 ,800 °F (761 °C to 980 °C), located as shown in Figure 2 or Figure 3. No single flame thermocouple reading shall be below 1 ,300 °F (704 °C). Piping upstream of the test valve shall not be larger than the test valve nominal size and not be smaller than NPS 1 or one half of nominal pipe size of the test valve whichever smaller for a distance of at least 6 in. (1 52 mm) as shown in Figure 1 . The upstream piping shall be enveloped in flame for a distance of at least 6 in. (1 52 mm) as shown in Figure 1 . Piping upstream outside of the flame envelope may be smaller diameter, but shall be sufficient diameter to deliver a flow rate in excess of the maximum allowable leak rate for the size of the valve being tested. The pipework downstream of the test valve shall be sufficient diameter to deliver a flow rate in excess of the maximum allowable leak rate for the size of the valve being tested and shall be inclined so that the downstream side is fully drained.