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[MW:2938] Suitable material for Spent caustic

By Materials & Welding
Sir,
spent caustic trearment plant having always leakage in treated spent caustic (with pH 5 to 9 ) line , while piping  has been made by cs material , we want to replace the piping with suitable material and  low cost while line pressure is 6 kg/cm2.
kindly sugest the material with details.
 
Regards
 
Lalit Kumar


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