Sunday, September 26, 2010

Re: [MW:7203] effect of longer holding time during hydrotest

It depends up on the code which you follow. As per ASME B31.3 (Process piping) it is minimum 10 minutes. But you take API 560 (for fired heaters) it  is minimum 1 hour.
 
If it is as per ASME B31.4 (Pipeline transport system for Liquid Hydrocarbon) then it is minimum 4hours. For pipelines the BS8010 calls for 24 hour test.
In almost all the cases it will be less than 90%  of yeild strength.
On Sun, Sep 26, 2010 at 10:36 AM, asad azmi <azmiasadayub@gmail.com> wrote:
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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