API St 6FA pdf free download

API St 6FA pdf free download.Standard for Fire Test of 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 and 6FD 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.
Except for check valves, the test valve shall include a port for the exclusive use of the relief valve (item 15 in
Figure 1) to relieve the center cavity pressure to the atmosphere to protect against potential rupture of the valve.
For check valves, a bypass line shall be included (item 21 in Figure 1).
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 pressurized side of the 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.
4.2.4 Bolt Coating
Coating and thread compound elements that cause liquid metal embrittlement shall not be used.
NOTE Lead, tin, antimony, bismuth, cadmium are examples of elements known to cause liquid metal embrittlement.
4.3 Test Facility
4.3.1 General
The test facility shall be designed to permit the validation tests to be performed as detailed in Figure 1. The minimum requirements for the test facility shall be:
— pressure source (item 1)
— pressure regulator and relief with a pressure as determined by the valve manufacturer (item 2)
— water vessel and associated measuring device (item 3 and item 4),
4.4 Test Procedure 4.4.1 General The valve shall be tested with water, with the closure member in the closed position. Except for check valves, the stem and bore shall be in the horizontal position. For check valves, the valve shall be tested in its horizontal flow orientation. 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 openposition. For valves with more than one closure member, the flame thermocouples and calorimeter cubes shall be located on the body of 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 1400。F and 1800。F (761。C to 980 °C), located as shown in Figure 2, Figure 3, or Figure 4. No single flame thermocouple reading shall be below 1300 °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. (152 mm) as shown in Figure 1. The piping on the pressurized side of the closure member shall be enveloped in flame for a distance of at least 6 in. (152 mm) as shown in Figure 1.API St 6FA pdf download.