A EXTERNAL COATING METHOD FOR GIRTH WELDED JOINT SECTION OF UNDERGROUND PIPING

摘要

PURPOSE: A fluid delivery tubing connection part painting method is provided to not need pre-heating process for heat shrink sleeve installation by installing the solvent-free epoxy degree of connectivity film on the connection part of the delivery tube. CONSTITUTION: A fluid delivery tubing connection part painting method connects as welding the end of the other delivery tube at the end of the delivery tube. To have 30~50cm width around the pipe laying welding line blasts. A forming degree of connectivity film is formed by spreading the solvent-free epoxy paint in the surface-treated part. The delivery pipe is C.T.E coating Pipe or a Tree Layer Polyethylene coating Pipe. A Surface treatment step processes the blasting to have the surface roughness 15~30μm for a delivery pipe.