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592 views
09:33 May-06-2007

Muhammad Azhar Jamil

NDT Engineer
Panama,
Joined May 2006
17
Re: Inspection of welding

Dear Nigel,

Many thanks for your reply, Infact let me explain something further, you are right that the dry powder or some other consumables can used specially made for high temperature applications, but the major problem with us is the time constraint as the plant was shut down on forced outage, and to get these products will take time as we might have to import them. The magnaflux product we have available on site are WCP2, 7HF (black ink) for MPI, and SKD (Developer) and Penetrant gor DPI, on the spray cans I think the mentioned temperature limit is that we cannot use > 50C. Therefore rephrasing my question is that if someone try to use this in the case mentioned in my previous email is allowable or not or if any one has used at that temperature please share your experience.

I will add another general question regarding welding inspection, that after how many hours it is normally recommended to inspect any weld, as fas as I know we have to give some time after welding for possible hydrogen cracking.

Thanks in advance for your time


 
09:50 May-11-2007

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
Re: Inspection of welding Hello Muhammad

Sorry I have not responded to your last post, but I have been remote from an internet connection for the last few days.

I hope you managed to source a supply of MPI high temperature dry powder particles for your inspections as this is the ready answer to your inspection problem. If not then my contention would be to wait until the pipes were sufficiently cool (<50 deg C) to allow the use of conventional ambient temperature MPI and Penetrant materials. Management has to understand the concepts of safety and quality of inspection. As Tom T stated at high temperatures there is a safety issue so we dont need to go further into the practicality of using normal temperature materials in such a case.

For your other question for materials/welding processes prone to hydrogen cracking, the delay period is usually a minimum of 24 hours from cessation of all welding activities prior to non-destructive examination.

Regards

Nigel


----------- Start Original Message -----------
: Dear Nigel,
: Many thanks for your reply, Infact let me explain something further, you are right that the dry powder or some other consumables can used specially made for high temperature applications, but the major problem with us is the time constraint as the plant was shut down on forced outage, and to get these products will take time as we might have to import them. The magnaflux product we have available on site are WCP2, 7HF (black ink) for MPI, and SKD (Developer) and Penetrant gor DPI, on the spray cans I think the mentioned temperature limit is that we cannot use > 50C. Therefore rephrasing my question is that if someone try to use this in the case mentioned in my previous email is allowable or not or if any one has used at that temperature please share your experience.
: I will add another general question regarding welding inspection, that after how many hours it is normally recommended to inspect any weld, as fas as I know we have to give some time after welding for possible hydrogen cracking.
: Thanks in advance for your time
------------ End Original Message ------------




 


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