SA-312TP316L ID Surface

[GemmellG]

Currently working on a cryogenic piping project. Received fabricated pipe spools from client. Please Note: Spools have been sitting in a storage facility for three years. Pipe spools were checked for dimension & damage when end caps were removed it was noticed there were multiple ID surface conditions. One of the major conditions was spatter from initial fabrication (Plasma cutting)that goes quite a long way up the pipe the other concern was some of the straight lengths has a sand paper type of surface through out the length of pipe. We have taken one sample spool with the residual spatter & sandblasted it removed all of the residual spatter leaving a surface finish the meets SSPC SP-10 only concern was the blast medium had iron oxide in the blast medium. Once the fabrication is complete we will be completing pacification flush after hydo testing.

 

[david339933]

I don't see a question......seems more like a diary entry.......

 

[metengr]

My concern is having iron oxide in the grit blast medium, which could result in rust staining and possible corrosion concerns.

 

[GemmellG]

You are correct question one is the blasting with the blast media that contains 10% to 20% iron oxide acceptable to remove the spatter from the plasma cutting. Other question is has any one ever seen stainless pipe have a sand paper ID surface.

 

[EdStainless]

It is OK if you nitric acid passivate afterwards, of course you are going to passivate anyways aren't you?

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P.E. Metallurgy, Plymouth Tube