Previous in Forum: Coating / Painting   Next in Forum: Air Cooling System Design
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
4 comments
Rate Comments: Nested
JacInsp
Participant

Join Date: Apr 2010
Posts: 4

PWHT after Hydrotest possible or not

04/08/2010 3:50 AM

If a pipe line which its Hydrotest is completed possible for PWHT again. If so what are the steps that should perform.
Register to Reply
Pathfinder Tags: PWHT after Hydeo
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: PWHT after Hydrotest possible or not

04/08/2010 3:57 AM

Does the PWHT run the risk of affecting the integrity of the pipeline, or, does the applicable piping code require the hydrotest to be completed after the PWHT? If so, repeat the hydrotest after the PWHT.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
JacInsp
Participant

Join Date: Apr 2010
Posts: 4
#2
In reply to #1

Re: PWHT after Hydrotest possible or not

04/10/2010 11:48 AM

Its pwht to be done before the hydro. Still is there any code saying that PWHT can be done after hydro, suppose a weld"o"let is not done PWHT. Shall we do it in this case.
Register to Reply
Anonymous Poster
#3

Re: PWHT after Hydrotest possible or not

05/05/2010 9:03 AM

Hydrotest has to be done after PWHT. There are two reasons for this

If you do not do PWHT, for a material which requires PWHT for mechanical properties, and you do hydrotest, you are increasing the chances of a brittle failures.

Secondly if PWHT is not done properly, and you induce cracks in the material, and you do not do hydrotest after that, tehn you are taking a risk of running with cracks.
Register to Reply
JacInsp
Participant

Join Date: Apr 2010
Posts: 4
#4
In reply to #3

Re: PWHT after Hydrotest possible or not

05/06/2010 7:00 AM

Thanks for your kind information and the the valued one that i have received for my request.
Register to Reply
Register to Reply
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); JacInsp (2); PWSlack (1)

Previous in Forum: Coating / Painting   Next in Forum: Air Cooling System Design

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Quality Assurance / Control:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (62 right now)
Show Members
Advertisement