RE: [MW:7219] RE: 7198] effect of longer holding time during hydrotest

See ASME B31.3, sec. 345.2.2:

345.2.2 Other Test Requirements

(a) Examination for leak. A leak test shall be maintained

for at least 10 min, and all joints and connections

shall be examined for leaks.

regards

Kristian

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shashank Vagal
Sent: 26. september 2010 13:09
To: materials-welding@googlegroups.com
Subject: 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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