A half coupling is a short length of pipe fitting used to create a branch connection from a larger pipe or vessel, typically when the branch is of a smaller diameter.
Here's a breakdown:
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Definition: A half coupling is essentially half of a standard coupling. It features a socket or threaded connection on only one end, designed to be welded or threaded onto a larger pipe.
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Purpose: Its primary function is to provide a connection point for a smaller diameter pipe to branch off from a larger one. This is commonly needed for instrumentation connections, drain lines, or small process lines.
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Construction: Half couplings are manufactured from various materials, including carbon steel, stainless steel, and alloys, depending on the application and the fluid being conveyed.
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Connection Type: The single connection end can be either:
- Socket Weld: Designed to accept a pipe inserted into the fitting and then welded.
- Threaded: Features internal threads (female) to screw onto a male-threaded pipe.
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Application Example: Imagine a large process pipe carrying water. You need to install a small drain valve. A half coupling can be welded onto the process pipe, providing a threaded connection point for the drain valve.
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Advantages:
- Compact: Occupies minimal space.
- Cost-effective: Less expensive than using a full coupling and a nipple.
- Simple Installation: Relatively easy to weld or thread onto existing pipes.
In summary, a half coupling is a useful and efficient pipe fitting for creating small-bore branch connections from larger pipes or vessels.
