API 607:2005 pdf download

API 607:2005 pdf download.Fire Test for Soft-seated Quarter-turn Valves.
5.6.2 With the test valve in the partially open position, open the water supply valve (5), the shut-off valve (6), the vent valves (16) and the shut-off valve (15) to flood the system and purge the air. When the system is completely filled with water, close the shut-off valve (15). the vent valves (16) and the water supply valve (5). Pressurize the system with water to a test pressure of 1,4 times the maximum permissible working pressure at 20 C — the actual test pressure may be rounded up to the next highest bar1). Check for leaks in the test apparatus and eliminate as necessary. Release the pressure. dose the test valve and open the shutoff valve (15).
5.8.3 lIthe valve under test is of the upstream sealing type, determine the volume of water that is trapped between the upstream seat seal and the downstream seat seal when the valve is dosed. Record this volume.
It is assumed that, during the fire type-test, this volume of water will flow through the valve and pass the downstream seat seal to be collected in the container (18). Since this volume has not actually leaked through the upstream seat seal, it is deducted from the total volume collected in the downstream container when determining the through-seat leakage (see 5.6.11).
5.6.4 Pressurize the system to one or the other of the following pressures, as appropriate:
a) for soft-seated valves rated PN 10, PN 16, PN 25 and PN 40, Class 150 and Class 300, the low test pressure at 0,2 MPa (2 bar);
b) for all other valves, the high test pressure at 75 % of the maximum permissible 5eat working pressure at 20 C.
Maintain this test pressure during the burn and cool-down periods, momentary pressure losses of up to 50 % of the test pressure being permitted provided that the pressure recovers within 2 mm and the cumulative duration is less than 2 mm,
5.6.5 Record the reading on the calibrated sight gauge or device (4). Empty the container (18).
5.8.6 Adjust the test system, excluding the test valve, during the test period to maintain the temperatures and pressures required.
5.6.7 Open the fuel supply, establish a fire and monitor the flame environment temperature throughout the bum period of 301 mm. Check that the average temperature of the two flame environment thermocouples (13) reaches 750 C within 2 miii from the start of the bum period. i.e. from ignition of the burners. Maintain the average temperature between 750 °C and 1 000 C, with no reading less than 700 C for the remainder of the bum period of 30 mm.
5.6.12 WIthin 5 mm of extinguishing the fire, force-cool the test valve with water so that Its external surface temperature remains below 100 C; the lime for cooling shall not exceed 10 mm. Record the time taken to force-cool the external surface of the valve below 100 °C.
WARNING — The internal parts of the valve could remain at significantly higher temperatures than the external surface of the valve.
5.6.13 Check and adjust the test pressure in accordance with 5.6.4. Record the readings on the sight gauge (4) and determine the quantity of water in the container (18). Record any leakage through the external pressure relief devce if fitted as part of the standard design. The figures are used to calculate the total external leakage throughout the burn and cool-down periods.
5.6.14 For valves PN 100 or Class 600 and lower, decrease or stabilize the pressure to the low test pressure at 0,2 MPa (2 bar), and measure the through-seat leakage over a 5 mm period
5.6.15 Increase or stabilize the test pressure to the high test pressure, close the shut-off valve (15). And operate the lest valve against the test pressure to the fully open position.
5.6.16 Stabilize the pressure o the high test pressure and measure the external leakage over a 5 mm period.