Shandong - flexible waterproof casing - welding requirements

Post-weld heat treatment requirements for pressure vessels, should be repaired before welding heat treatment, such as heat treatment after welding repair, rework and then heat-treated. There is resistance to intergranular corrosion requirements of austenitic stainless steel pressure vessels, repair parts still need to ensure that existing between resistance to intergranular corrosion. After the pressure test should be repaired, the repair site must be qualified as originally requested by the non-destructive testing. Since taking over welded joints or for repair of the leak, or repair a large depth of 1/2 the thickness of the pressure vessel, the pressure should be re-tested. Steel pressure vessel and pressure parts shall be the relevant provisions of 150 GB post-weld heat treatment.