The pipe is made of welded steel pipe, and the basic form and size of the welded joint shall comply with the provisions of GB/T 985.1-2008, GB/T 985.2-2008, and GB/T 985.3-2008; the surface of the weld shall be uniform, and there shall be no cracks on the surface. , slag inclusions, needle-shaped pores, welding flashes, incomplete welding, incomplete penetration, incomplete burn-through and arc craters, etc., and no leakage welding is allowed. “Secondary Standard.
Anti-corrosion treatment of steel pipe fittings:
(1) The steel pipes and iron parts directly buried in the concrete are only treated for rust removal, and no paint shall be applied.
(2) The external anti-corrosion of buried steel pipes and steel pipe fittings adopts extruded polyethylene three-layer structure to strengthen anti-corrosion, according to GB/T 23257-2017 “Buried Steel Pipe Polyethylene Anti-corrosion Layer” and refer to the manufacturer’s enterprise standard Execution, the thickness of the anti-corrosion layer is ≥3.7mm; the heat-shrinkable tape with epoxy resin primer is used for the repair; the special repair sheet for radiation cross-linked polyethylene is used for the repair.
(3) Two coats of H06-02 iron red epoxy paint with a thickness of 60um are applied to the outer wall of the exposed pipes and steel parts, with a thickness of 60um; two coats of various alkyd enamels with a thickness of 70um.
(4) The internal anti-corrosion of the steel pipe is painted with epoxy resin (thickness ≥ 0.3mm).
(5) Mechanical shot blasting and rust removal should be carried out before the anti-corrosion coating is applied, and the rust removal level should meet the requirements of Sa2.
Post time: Jun-24-2022