Back Purging on SS Plate

Code is just a set of rules which provide guidelines for quality product.However,code cannot provide the whole requirement of your customer.If you are serious,then pls ask your customer to get a precise answer.

Thanks

You would need to specify which Code(s) govern this type of work in your local jurisdiction. Your procedure, which seems reasonable, might be acceptable for some kinds of "normal" usage, but not acceptable for something like nuclear pressure vessels. The plate thickness might also matter.

Thanks.

Dear sir,

We are using ASME Sec IX,ASME Sec VIII.

Oil and Gas field.

Plate thickness 8mm.

Description:Baffle plate involved in DRUM.

Please give your feedback that in ASME Sec VIII ,in which or anyother code talking about this .

Please give your reply.

Thanks.

Hi Rajan,

We design and install process piping systems in the food, dairy, and pharmaceutical industries. All of the piping we install and the vast majority of the components we fabricate are stainless steel.

Whenever you are in a situation where the heat of the weld will penetrate the back side of the piece you are welding to, you should protect that area from oxidation. The best thing to do is to build a "dam" or enclosure out of anything you have laying around and run Argon through it as you weld. Feed the Argon at one end, put a small exit hole at the opposite end, and once the enclosure is full of Argon, adjust the feed regulator so you can feel a light flow at the exit hole. You don't want to pressurize this enclosure, just enough flow so that you can feel it on your cheek.

Hope this helps.

Thanks

I've seen this method using SMAW on carbon steel structural items but not with Stainless. I would build a box for the back side and purge with Argon as the other post recommends. Remember Argon is heavier than air so you might feed from the bottom of the box and vent from the top to ensure you get complete blanketing with the purge gas and give enough time for the Argon to displace all the air.