Connection Methods Of Galvanized Round Pipes

Galvanized steel pipes used for domestic water supply are all connected by threads, also known as threaded connections. Generally, water supply pipes with a nominal diameter not exceeding 100 mm and a nominal pressure not exceeding 1 MPa can be connected by threads.

The threads of the connecting pipes are also divided into two types, cone and cylindrical, like pipe joints. If the general pipes are manually threaded, they usually do not meet the conical pipe threads.

The pitch and other technical requirements of cylindrical pipe threads are the same as those of conical pipe threads.

Pipe threads can be made by threading with pipe hinges or by lathes.

There are several different ways to connect pipe threads. For example, cylindrical internal threads are inserted into cylindrical external threads; cylindrical internal threads are inserted into conical external threads, and conical internal threads are inserted into conical external threads. The latter two methods can obtain a tighter connection, so they are also the most commonly used connection methods.

When pipes are connected by threads, appropriate fillers should be added between the external threads of the pipe and the internal threads of the pipe fittings. Commonly used fillers are oil hemp root and white thick paint. The specific method is: on the (external) thread of the sleeve, wrap a thin and even layer of oil hemp root along the direction of the thread, then apply white thick paint on the surface of the hemp root, and then screw on the connector. It must be noted that when using the hemp root white thick paint, it should be avoided to enter the pipe to avoid blockage.

After tightening the connector, in order to make the interface clean and beautiful, the excess oil hemp root and white paint should be removed and wiped clean. The use of oil hemp root and white thick paint not only plays a sealing role for the medium. It also plays a rust-proof role for the processed pipe thread.