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 -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.