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Re: [MW:21461] Flange leak in hydrotest

By Materials & Welding
KUMAR,
The idea behind hydrotest is to ensure system integrity at specified pressure for specified time.
In your case, it is a PASS if 27 bar pressure holds for the specified duration.
 
With Best Regards,
Shashank C Vagal (Quality Adviser)


On Friday, 25 July 2014 11:53 AM, Kumar <sk7920541@gmail.com> wrote:


Dear all,
During the hydrotest of a product line of about 1.3 km (asme B31.3/4, 24 bar test pressure, 4 hour holding time), 2 blind flanges are given at each end. One of the flanges were found as leaking (as drops) upon inspection. Around 15 mtr. Of the line in between is underground and hidden as well. Sub-contractor is arguing that line has a pressure around 27 bar (due to temp.) Which is above test pressure thus can be accepted. They are saying code allows "blind flange leakage" also. Anyhow we are not agreeing for that. Expecting your valuable feedback on this issue.
Thanks in advance,
Kumar.
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