Hi,
Back seat is the test carried out to check tightness of "Back Seat" of valve.
As we know, pressure test is carried out to check integrity of the valve body, back seat test ensures that valve shall not leak when valve is fully open and pickings are untightened when valve is fully pressurized. Generally we mention in valve data sheet that , valve packing shall be replaceable under full pressure. This test is linked with that note. During test valve is fully opened (disc rest on back seat) & leakage is checked. Please cl.6.2.1 of API 598. This test can be combined with shell test.
Honestly speaking, nobody would dare to replace packing when valve is fully pressured in routine work.
Regards,
Vivek
On Sat, Jan 21, 2012 at 8:01 AM, Gopi Perumal <parinitaa2010@gmail.com> wrote:
Dear all,
Anybody can explain what is mean by Backseat test in Valve Testing? (API 598)
Thanks,
P Gopi
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