API 607:2005 pdf download

API 607:2005 pdf download.Fire Test for Soft-seated Quarter-turn Valves.
5 Firetestmethod
5.1 General warning
Fire testing of valves Is potentially hazardous and it is essential that the safely of personnel be given prime consideration. Given the nature of the fire test and the possibility of weaknesses in the design of the test valve and test equipment, hazardous rupture of the pressure boundary could occur. Adequate shields in the area of the test enclosure and other appropnate means for the protection of personnel are necessary.
5.2 Principle
A closed valve completely filled with water under pressure is completely enveloped in flames with an environmental temperature in the region of the valve of 750 C to 1 000 C for a period of 30 mm, The objective Is to completely envelop the valve In flames to assure that the seat and sealing areas are exposed to the high bum temperature. The intensity of the heat input shall be monitored using thermocouples and calorimeter cubes as specified in 5.6.7 and 5.6.8. During this period the internal and external leakage is recorded, After cool-down from the fire test, the valve is hydrostatically tested to assess the pressure- containing capability of the valve sheN. seats and seals.
5.3 Apparatus
5.3.1 General
The test equipment shall not subject the valve to externally applied stress affecting the results of the test.
Schematic diagrams of recommended systems for fire type-testing of valves are given in Figure 1.
Potential pipework-to-valve end connection joint leakage Is not evaluated as part of the test and is not induded In the allowable external leakage (see 6.3 and 6.6). For the purposes of this test, it may be necessary to modify these joints to eliminate leakage.
The test equipment shall be designed so that if the nominal diameter of the pipework situated immediately upstream of the test valve is larger than DN 25 or one-half the DN of the test valve, the pipework shall be enveloped in flames for a minimum distance of 150 mm from the test valve. The diameter of the upstream pipework shall be sufficient to deliver a flow rate in excess of the maximum allowable leak rate for the size of valve being tested.
The pipewock downstream of the test valve shall be at least DN 15 and shall be inclined so that the downstream side is fuUy drained.
The flame source shall be at least 150 mm minrnum away from the valve or any calorimeters, and should have sufficient capacity to completely envelop the valve in flames.
The enclosure containing the valve shall provide a horizontal clearance of a minimum of 150 mm between any part of the test valve and the enclosure, and the height of the enclosure above the top of the test valve shall be a minimum of 150 mm.