Materials of construction and corrosion allowance for all EQUIPMENT and machinery shall be for the designed life of Equipment. However, minimum corrosion allowance to be adopted for carbon steel (including 0.5 Mo alloy steels) and others shall be as follows :
Tubes: .......................................................................................... 1.0 mm (0.0400")
Shell: ............................................................................................ 3.2 mm (0.1260")
Inlet / Outlet Vestibules: ............................................................... 3.2 mm (0.1260”)
Steam Drum: ................................................................................ 3.2 mm (0.1260”)
Piping: .......................................................................................... 1.6 mm (0.1260”)
Removable parts or internals): ..................................................... 1.6 mm (0.1260”)