[MW:7200] RE: 7198] effect of longer holding time during hydrotest

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

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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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