If the air separation column is installed at normal temperature and works at low temperature, if the prestress is too large or the cold compensation is not good, it is easy to cause pipe cracking and valve sticking. In order to avoid this kind of problem, the installation should be done: when piping, it is generally large first and then small, difficult first and then easy, small pipe let big pipe, heat pipe let cold pipe; when the welding joint of valve and pipeline is too large, do not force installation; for the welding joint of flange connecting with valve and vessel, do not add gasket before welding, tighten the flange bolt, and then add gasket after welding; change the valve hanger into rigid support Avoid using small pipe and stem as scaffold.
