Gas tightness test of ball valve
the gas-tight test for removed ball valve
(1) the valve in half. The ball with pipe joints with both the flange cover sealing.
(2) introduction to the end, test for testing medium of clean air or nitrogen. The other side pipe joints block. Gradually pressurization to 5.6 bar closed after inlet valve stops intake.
(3) ball rotation after a few times to operate drive off (ball),
(4) open another end (the) introduced testing gas pipe fittings loads the cavity pressure drop for tm.
(5) in the test pressure (5.6 bar), more than 5min time, air cavity pressure may decline. Should be used to gauge, 10bar range 0.4.
(6) with soap and water check each flange and packing of external leakage, do not have increasing bubbles appear.
(7) and the other side in introducing test medium, repeat the test.
(8) After the test by compressed air blowing soap water clean. Demolition ends flanges, remove valve seal surface residual ends of sealing, if there is residual into the hole, and shall remove valve and scrub clean.
Online seal test
(1) were found on the downstream of valve, valve closed truncated.
(2) was ball valve is opened.
(3) is trying to introduce test before the ball, pipeline for cleaning of nitrogen testing medium gradually pressurization to 5.6 bar closed after inlet valve stops intake.
(4) the ball a few times after turning ball close (operation drive).
(5) was trying to open the downstream piping ball valve on the ball out to pressure for atmospheric pressure oral.
(6) in the test pressure (5.6 bar), more than 15min inlet pressure within the time, pressure gauges should not used, 10bar range 0.4.
(7) with soap and water check each flange and packing of external leakage, do not have increasing bubbles appear.
(8) and then try to introduce test after the ball, pipe repeats the test.
After the test (9) with compressed air blowing soap water clean.
