This kind of pipe fittings have not been inspected in the business, and can be sent to the manufacturer. What item does he want to inspect, pressure test or tensile strength, let him come up with the inspection plan, and then ask him what standard is based on, the general inspection is appearance inspection, smoothness and roughness, trachoma, heavy skin, angle size, geometric size, and pressure. It can also be said.

There are precision casting and ordinary casting for grooved pipe fittings. The quality of the surface of the precision casting should be treated by chemical methods, and the quality is related to the ratio of the reagents. For ordinary casting, I know there are two kinds of surface coating: spray painting and powder coating. After all, it is a casting, and the surface will not be treated. The surface quality after painting is still not very satisfactory. After powder coating, the surface is very good. Tested with a thickness gauge.

Ordinary fire engineering grooved pipe fittings have rigid elbows (90 degrees 45 degrees) Positive three-way positive four-way groove Mechanical three-way wire connection Mechanical three-way mechanical four-way conversion flange Split flange groove Reducer wire connection Reducer Pipe grooves have tee wire connection reducing tee, the size includes clamp connection 76 89 114 165 219 (galvanized pipe) 108 159 (seamless pipe) wire connection includes 33 42 48 60 76 89 114 generally 100 (ie 114 outer diameter) above with groove connection 100 below with wire connection.