Stub-in and Stub-on are methods for making a fabricated branch connection from the pipe. Both Stub-in and Stub-on branch connections are approved by international codes and standards and reduce the cost of pipe fittings.

In this article, you will learn how stub-in pipe works, its use vs stub-on, as well as the use of a stub tube. Typically, when the difference between the run pipe and a branch pipe is more than one pipe size, then stub-in provides a suitable connection option.

Pipe stub outs are pipes that stick out from a wall or pipe tee. Stub outs are also called stub-ups. They are capped until a branch pipe is attached. The branch pipe can be inserted after the pipe cap is removed. Stub-ins can replace a reducing tee in joining branch pipes.

Stub-in connections, also known as branch or lateral connections, involve connecting a smaller pipe or branch to a larger main pipe. This technique is widely used when a diversion or branch from the main pipe is needed for various purposes, such as distribution, control or instrumentation.

Jul 12, 2011 · For "stub in," the stub or branch pipe extends to the inside of the main pipe. The hole in the main pipe is (usually) beveled to allow for a full-penetration weld. For "stub on," the stub extends only to the outside of the main pipe.

Stub-on connections, also referred to as saddle connections or saddle taps, involve attaching a saddle-like fitting onto the main pipe to create a branch connection. This technique is commonly used for smaller pipes or temporary connections.

For “stub on”, the stub extends only to the outside of the main pipe. The welding strength of the stub-in connection is as good as butt welding, but the welding procedure is difficult under actual conditions.Stub-in is comparatively stronger than stub on connections.

Nov 30, 2021 · How to do Pipe Branch Stub In Fittings. Header pipe will also be grinded in the hole (bevel). And in the branch pipe also (bevel) grinding is not to be done, only cut back cutting is to be done and the face is to be kept exactly the same. In the drawing you can see how the design is made. Header pipe ID to branch pipe OD matching will be done

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