Pipe Nipples & Swages

 Pipe Nipples:


By design, screwed and socket weld fittings cannot be assembled by placing one fitting directly in contact with another fitting. Screwed fittings are manufactured with threads on the inside of the fitting, and the socket weld fittings have internal socket that prevents fitting makeup assembly. To facilitate the assembly of screwed and socket weld fittings, small lengths of pipe called pipe nipples are used between fittings. Pipe nipples can vary length depending upon the distance required to fabricate the pipe configuration. A close nipple is one that provides the minimum length of pipe between fittings. Remember, screwed and socket weld fittings have a certain amount of lost pipe due to thread engagement and socket depth. Therefore, each size pipe has different minimum length for the dimension of a close nipple.

Many companies use 3" as the standard minimum fr pipe nipples. This length will accommodate the amount of pipe lost inside the fitting on each end as well as provide sufficient wrench clearance during assembly for the larger screwed and socket welded pipe sizes.

Swage:




Drawing Symbol of Swage
Swages are functionally similar to reducers, but are specifically designed for screwed and socket weld pipe. 
Screwed swages have male threads and can be connected to other screwed fittings without the use of pipe nipple.
They are used to make reduction in the line size on a straight run of pipe.
Swages are available in Concentric and Eccentric Shapes.
Swages are also manufactured with different preparations on the two ends. When specifying a swage, use the following abbreviations:
  • BBE - bevel both ends
  • TBE - thread both ends
  • PBE - plain both ends
  • BLE/TSE - bevel large end/thread small end
  • PLE/TSE - plain large end/thread small end.


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