LS Pressure Vessel Categories: Design and Manufacture of Pressure Vessels of Classes A1, A2 & A3; Design and Manufacture of Vessels of ASME U LS Pressure Vessel Materials: Stainless Steel, Dual-phase Steel, CrMo Steel, Low-temp Steel, Ni-Alloy, Ti-Alloy, other Special Materials. LS Pressure Vessel Application Area: Coal Chemical, Salt Chemical, Polysilicon Chemical, Aluminium Oxide, PVC, Oil Refining, etc.