Thursday, September 3, 2009

[MW:3105] Re: Hydrotest for high pressure piping

Tie in joints are always consider as a golden joint.generally there is no hydrotest is require
for the golden joint.
instead of hydro test we are doing 100% MT/PT for the bevel surfaces, root pass and final and 100% RTfor final joint.
regards
RE

--- On Wed, 2/9/09, tong tong <tong2je@gmail.com> wrote:

From: tong tong <tong2je@gmail.com>
Subject: [MW:3099] Hydrotest for high pressure piping
To: materials-welding@googlegroups.com
Date: Wednesday, 2 September, 2009, 10:49 AM

Dear All,
I have one tie-in point. The material is SA 312 TP316L. The test pressure is 350 bar and operating pressure is 250 bar. The big problem is there are no isolation point so hydrotest can't be performed on it. When I refer to API 570, clause 8.2.6 stated that when a pressure test is not necessary or practical, NDE shall be utilized in lieu of a pressure test. Due to this line is high pressure, is it enough only perform the NDT ? How suppose i do to convince our management level regarding integrity of the weldment ? Please help me. Thank in advance and you cooperation is highly appreciated 
Regards
Tong2je


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