Product standard Specification: O.D.:33.7—219.1 (mm) Wall thickness:2.75—5.0 (mm) Anticorrosive:1. hot galvanized 2. powder coating End: Plain End, Rolled Grooved,Shouldered Function: Fire and water supply system in building The Fire protection piping holds tighter tolerances than ASTM A135,ASTM A795,ASTM A53, AS 1074 specification. (Wall tolerances are held to -5% instead of the -12 ½% per ASTM A135 and A53.)
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