8.6 Oxygen pipeline construction, inspection 1 H 'u. K $ W8 L) ~ 0 C, K. P

Press the "GB 16912-1997 oxygen gas safety and related technical regulations," the 8.6 oxygen pipeline construction, acceptance of the Rules.

8.6.1 Oxygen pipes, valves and fittings, etc., should be no cracks, skin scales, slag, etc. Contacting surfaces must be completely removed by oxygen burrs, weld, welding slag, sticky sand, rust and other combustible materials, maintaining smooth wall cleaning, pipe rust should be carried out until the character to appear. During installation and post-installation should take effective measures to prevent contamination by grease, to prevent combustible materials, rust debris, welding slag, sand and other debris entering or remaining in the pipe, and should be strictly checked.

8.6.2 Welded Carbon Steel Pipe oxygen should be used when welding backing. Piping installation, welding and construction, inspection procedures required addition to the above, and shall comply with GB J 235 (metal pipes papers), GB J 236 the relevant provisions. Should be increased by an oxygen pipeline categories.

8.6.3 Oxygen piping, valves, etc. all parts in contact with oxygen, installation, maintenance and must be strictly rust, degreasing. Valves and instrumentation have been skimmed at the factory, and have a reliable seal packaging and proof, it can no longer skim. Rust can sandblasting, pickling. Degreasing cleaning agent can be of inorganic non-combustible, carbon tetrachloride and the like solvents. And applying UV Inspection Act, camphor Inspection Act or solvent analysis method for checking until the qualifying date. Degreased carbon steel passivation oxygen piping should be immediately closed or filled with dry nitrogen gas nozzle. Hydrostatic test of the pipe, the pipe wall after degreasing must be passivated. 8.6.4 Oxygen pipe installation should be performed after strength and tightness test, the test requirements shall comply with the following: "X-P) N4 a) oxygen pipeline strength test application does not oily or dry air, clean water, nitrogen. Working pressure greater than 3.0MPa oxygen water pipe applications do strength tests.

Carbon steel pipe using oxygen pressure method test, the test should be carried out before the tube wall passivation.

Austenitic stainless steel oxygen pipeline, hydrostatic test water quality in the chloride ion content must not exceed 25g/m3, otherwise it should be taken. b) Test pressure test the system to be calculated on the basis of the design pressure. When not specified on the drawing, use the system working pressure for the test pressure calculation basis. c) using water as strength test, the strength test pressure is 1.25 times design pressure not less than 0.1MPa; design pressure of 10MPa or greater pipes, pressure strength test pressure is 1.5 times the design pressure. Pressure strength test, to test pressure to maintain 10min, check the tube no distortion, no leakage is qualified. After the test application no oil residue gas inside the tube purged.

d) gas do strength test, strength test pressure shall be not less than 1.15 times the design pressure of 0.1MPa.

Gas do strength test, the step should be carried out step by step; first rose 50% test pressure, after inspection, then 10% of the test pressure differential gradual step, every stage residence not less than 3min, to test pressure stable 5min, with no distortion, no leakage is qualified. Pipeline design pressure less than 0.1MPa, from time to grade boost.

Gas do strength test, there should be safety measures, and approval by the competent units of the security sector.