Backbone oxygen pipeline from the liquid oxygen station to the station for oxygen in cylinders: - operating pressure equal to the pressure in the tank, exceeding 15 bar,- material: acid-resistant stainless steel Č.4574 (316 L)W.Nr. 1.4571, DIN 17456, 17458, ASTM A312,- manufactured of degreased pipes and fittings,- laid underground in the concrete channel, non-insulated, Ø33.7x3.2 mmInstallation requirements:Pipes, arches and other fittings shall be weld applying the TIG-procedure, using the tungsten electrodes in the protected atmosphere of the argon mixture of inert gas with argon. It is mandatory to have 100% radiographical control of weld connections. To be executed by certified welders. Pressure testing P = 1.5 x Pr