Sunday, September 26, 2010

Re: [MW:7205] RE: 7198] effect of longer holding time during hydrotest

Kristen:  Please quote the clause from B31.3 about 10 min holding time. For me, and most of us, too, this issue is unsettled.  It will be a good help.
As I see it, hydrotest and strength tests have different connotations.   Please correct me if I am wrong. 

Asad:     So long as you are not crossing the 75% (or as specified) SMYS value for all components in the                        

               loop, the holding time is a non-critical point. But why would you want to increase it, if all your  

               leak test checks  are completed. It does not make sense – safety wise and economically at  

               least.

Shashank Vagal

--- On Sun, 26/9/10, Kristian Lund Jepsen (KUJ) <KUJ@ramboll.com> wrote:

From: Kristian Lund Jepsen (KUJ) <KUJ@ramboll.com>
Subject: [MW:7200] RE: 7198] effect of longer holding time during hydrotest
To: materials-welding@googlegroups.com
Date: Sunday, 26 September, 2010, 2:43 PM

ASME B31.3 only require 10 minuttes hydrotest.
That is fully enough for a strength test - and in most cases also for a hydrostatic leak test.
 
But some companies (contractors, costumers) require 30 minuttes test, some 1 hour. It will normally be stated in procedures as part of an ISO 9000 quality system.
 
regards
Kristian


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of asad azmi
Sent: 26. september 2010 07:06
To: materials-welding@googlegroups.com
Subject: [MW:7198] effect of longer holding time during hydrotest

Dear All
 
Goodday.
 
 
On what basis holding duration (eg.1 hour, 2hour etc) of hydrotest is decided.
 
 
What will be the effect on mechanical proerty of material if the holding period exceeds than as required by design.
 
eg. suppose for a particular hydrotest  holding period is 2 hours and actual holding period exceeds to 3 hours. what will be the effect on mechanical proerty.
 
 
Thanks in advance for your valuable suggestions.
 
Best Regards
 
Asad Azmi

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