Thursday, April 29, 2010

[MW:4994] DSS pipe cutting

dear All
 
Please provide your expertise for the below problem
 
I need to take a branch connection of 4" from a pipe 12" A790 UNS 31803 and had been using plasma cutting to do the same. However soon after carrying out the Plasma cutting it was noticed that the inner wall of 12" pipe starts getting corroded due to the sparks impinching on the inner wall of the pipe  arised during plasma cutting ,( attached Photo graphs )
 Kindly advise  how to avoid  the same  or any other suitable precautionary steps to be taken during cutting  on DSS.
 
Regds
Prem

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