Joining Two Steel Pipes

Two union nuts and a ring nut.

Joining two steel pipes.

There are three main methods of joining pipes together and attaching fittings to them. Lines of 2 inch or larger are usually butt welded this being the most economic leak proof method. The valve shown has 1 2 in. It is important to know the type of coupling to use for galvanized pipe and the fitting procedure so the pipe is leak free.

Read down below to find out how to join two pieces of metal without welding. The photo shows how to use common plumbing parts to join a new ball valve and a flexible stainless steel connector to steel pipe. This is probably one of the easiest methods of joining pieces of metal or anything together. There are numerous methods for joining metals without welding.

Galvanized pipe has a zinc coating that is either rough or smooth depending on the type of zinc and steel heating process. Subsequent to the symposium asm international published a book joining of stainless steels. Even though push fittings are easy you still have to do your homework. Smaller lines are usually joined by socket welding or screwing.

Committee of stainless steel producers american iron and steel institute 1133 15th street nw washington dc 20005 u s a in co operation with asm international formerly american society of metals metals park oh 44073 u s a. When the filler metal cools it bonds the two pieces of metal. Insert the ring nut over one of the sections of pipe. The union nuts attach to the replacement sections of pipe where they join together.

Make sure the pipe joint compound or tape go into the threads to ensure a water tight connection. The ring nut acts to join the two pieces. Coat all threaded pipe connections with pipe thread compound before assembly. The union is a fitting that consists of three components.

Start by liberally coating the threads of the pipe with pipe dope or wrapping the threads with ptfe tape. Screw both sections of pipe into their respective fittings. Pipe joining methods soldered this is the process of joining pipe by melting a filler metal with a low melting point into a joint. Connecting together galvanized pipes that are non threaded uses a coupling that creates a sealed joint.

Push fittings haven t been around all that long but they are without a doubt the easiest way to join two pipes. Some of these alternatives to welding methods require heat while some don t require heat at all. Joining galvanized iron fittings to galvanized steel pipe requires pipe dope or ptfe tape and two pipe wrenches.