In one of our polysilicon project, we have decided to use the following pipe materials for HCL service.Kindly comment for the same Gentlemen :)
1) service : Anhydrous HCL ( vapour), design press .=2Mpag, -46/200 C
Material anticipated A 333 Gr 6.
2)service : Anhydrous HCL ( liquid), design press .=2Mpag, -85/100 C
Material anticipated 316/316L.
3) service : HCL ( 0 to 35 % Aqueous), design press .=1.5Mpag, 75/200 C
Material anticipated PTFE lined.
suggest alternative if any.