sachinIn one spec descrip is :
Cl 150 RF , CS , 0.063″ corrosion allowance
-20 to 750 F @ 285 to 95 psig
Pipe Moc : A 53 /A 106/ 5L / seamless/A 53 – B- ERW
Large Fit MOC ; CS A 234-WPB
Small Fit MOC : CS A 105 ( 1.5″ & < ) Pipe ( 4" ) : A 53 - B-E , ERW , Std Wt , BBE In other : Cl 150 RF , Killed CS , 0.063" corrosion allowance -20 to 750 F @ 285 to 95 psig Pipe Moc : Killed CS A 106-B seamless Large Fit MOC ; CS A 234-WPB Small Fit MOC : CS A 105 ( 1.5" & < ) Pipe ( 4" ) : A 53 /A 106/5L- B , seamless , Std Wt , BBE Manufacturing method of pipe differs in two cases. Why ?