Process flow of 3PE anti-corrosion steel pipe before processing

Before processing the 3pe anti-corrosion steel pipe, the appearance of the steel pipe must be observed one by one by skilled workers using visual methods. Steel pipes must be free from significant mechanical damage, double skin, cracks, dents, and other defects. Steel pipes that do not meet inspection standards cannot be used. Made a non-conforming mark for return. Those who pass the inspection can be used for construction. When a flat mouth appears at the mouth of a threaded pipe, please immediately find a circle to repair it. Anything that cannot be repaired should be discarded. Firstly, use a clamp to transfer the steel pipe that needs anti-corrosion treatment to the upper pipe socket of the work line. Preheat the outside of the steel pipe with a flame heater device to remove moisture, oil stains, foreign objects, etc. from the surface of the steel pipe. Control the heating temperature at 40-60 degrees Celsius to improve the rust removal quality of the steel pipe surface. All steel pipes are rust removed using a PW-380 steel pipe shot blasting machine. Before entering the shot blasting room, rubber seals or thick sponge nozzle plugs are used to seal the nozzle ends of the steel pipe (for example, the nozzle plug of the steel pipe is sealed with this nozzle plug while ensuring the amount of steel shot used for rust removal). After shot blasting rust removal, the surface of the steel pipe reaches Sa2.5 level as specified in GB/T8923-1988 "Rust Grades and Preparation Grades of Steel Surfaces before Coating". The anchoring depth of the surface must be carried out according to the instructions provided by the epoxy powder manufacturer. After surface pretreatment, please remove all rust, oil, scale, etc. Please inspect the outside of the steel pipes one by one, grind the surface defects that may cause coating leakage using appropriate methods, and ensure that the wall thickness after grinding is not above the specified value. Please remove or repair defective steel pipes. For steel pipes with unqualified rust removal quality, immediately mark the line, remove the objects inside the pipe, and return to the production line for rust removal again.