Hydrotest purpouse is for pressure resistance of the welds and welded materials (I,ve seen personally wrought materials fittings failing under hydro) therefore you do not need to install permanent blind flanges (and even original gaskets and bolts) as called by the ISO.
After hydrotest and assembly of the complete lines (spools, gaskets, bolts, inline items, valves, etc.) It could be advisable to perform a complete circuit leakage test with air or nitrogen to assess the corrent assembly of the bolted components, including also a bolt torque campaign with wrenches or special tools for bolts diameter > 1-1/2".
Regards,
Alberto
Alberto Bertoni
From: Richard robes <mech.processes@gmail.com>
Sender: materials-welding@googlegroups.com
Date: Fri, 14 Feb 2014 18:34:39 -0800 (PST)
To: <materials-welding@googlegroups.com>
ReplyTo: materials-welding@googlegroups.com
Subject: [MW:20101] Hydrotest of Blind Flange
Dear Experts,
-- Kindly comment on the issue - In ISO drawing there is a blind flange coming after weld neck flange and it's included in hydro test limit too. But now hydro test crew want to use temporary blind flange instead of permanent blind flange. My question is whether i have to include permanent blind flange during the hydro test.
Regards
Richard
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