Procurement of cryogenic air separation equipment

What are the requirements for selecting materials for high purity nitrogen gas distribution pipelines in small air separation unit?   High purity nitrogen gas has to be transported through pipelines to the point of use of the small air separation unit. In order to meet the quality requirements of the gas for the process, the selection of materials for the piping system and the quality of construction need to be paid more attention to during the construction process, provided that the gas ...

(1) argon arc welder must have a pressure vessel welder qualification certificate, no permit personnel are strictly prohibited to weld. (2) in order to effectively control the speed of heating of the welded parts, should be used as far as possible to break the arc method of welding, welding wire diameter selected towel 3mm, while welding current should be given strict control, such as towel 12 * 2 instrumentation pipe joints recommended to use 60 ~ 80 amps welding current, the maximum should no...