Welded Pipes

Hi Guest,

I would say a reserved 'yes'. In order to adequately answer the question, some background information on the application would be useful.

Is it being used structurally or for pressure containment?

If it is being used for pressure containment, what is the fluid?

Which part of the world is it being used in?

Is it for a homebuilt project or an 'official' use?

Please advise so that you question can be answered fully.

The service of the pipe line is 'process gas' & pressure range is 20Kg/sq.cm/38deg.Celsius.

Can you please revert me now?

For what industry and what kind of 'process gas'?

This is for one of the Refinery Projects in India & The Plant is 'Hydrogen Unit', service of fluid inside the pipe line is 'Process Gas-Purge'.

Pl. revert me quickly.

There should be a code and or procedure for allowable joining methods for PGP. I am concerned with your statement though. In refineries there are both gas and fluid purges. They may or may not have similar allowable joining methods.

This is not new ground - there is established methods for the work you are performing. I would insist that you refer to the customers specs which should, at the very least, be available to the project quality personnel and included in the original bid package.

However, if you ARE the customer it is a decision that your engineering will need to evaluate.

There is no quick response from where I sit given the information offered.

cr3

As CR3 said, what is important is that you are in strict compliance with the codes applicable to this type of installation.

Something else to consider is hydrogen embrittlement, which is more likely to affect welds than parent metal. Heat treatment of ALL welds is vital.

Here in Alberta, Canada we have a HUGE amount of oil and gas activity, especially extraction, upgrading and refining of tar sands, as well as conventional oil and gas.

EVERYTHING has to be designed and built to the applicable codes (there are many), and anything not in strict compliance with those codes is unusable.

Talk to your friendly local code inspector to find out what is and is not acceptable.

Thanks all..