| 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 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.
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