Requirements for machining forgings

1. The castings are not allowed to have visible cracks, folds and other appearance defects that affect the use. Local defects can be removed, but the cleaning depth shall not exceed 75% of the machining allowance. The defects on the non-machined surface of the forgings should be cleaned. Clean and smooth transition;

　　2. The nozzle and riser of the ingot should be removed enough to ensure that there is no shrinkage and serious deflection of the forging;

　　 3. White spots, internal cracks and residual shrinkage holes are not allowed in forgings;

　　4. The forgings should be forged on a forging press with sufficient capacity to ensure that the forgings are fully forged;

Machining piping requirements

　　 1. Before assembling, all pipes should be free of flashing, burrs and chamfers at the pipe ends. Use compressed air or other methods to remove debris and rust attached to the inner wall of the pipe;

　　2. When assembling, tighten the pipe clamps, supports, flanges, and streets and other parts that are fixed and connected with threads to prevent them from loosening;

　　3. When the piping takes over or operates, the pipe separation port must be sealed with tape or plastic pipe to prevent any debris from entering it, and label it;

　　4. The welded part of the prefabricated pipe shall be subjected to a pressure test;

　　5. Before assembling, all steel pipes must be degreasing, pickling, neutralization, water washing and anti-rust treatment, whether it is conventional pipe materials or prefabricated pipes, this is required;