What can happen to the DEAR Liquid air separation unit forced valve itself?

Before installing pipe , check the orientation of the container orifice, the orientation of the valve inlet and outlet is correct. The pipe fittings should be thoroughly cleaned ten net and strictly degreased, while opening the welding bevels etc. The welded pipe must be brushed with clean stainless steel wire for a very short time before welding. In order to reduce the cold box pipe welding mouth, can be prefabricated in a clean plant, and later for the final distribution. Piping principles, f...

Why is the expander temperature of air separation equipment lower than liquefaction point very harmful?