Elbolets are used with 90 or 180 degrees long radius and short radius (more rarely) elbows for thermowell and instrumentation connections or as a drain connection when there is too little space for using a Weldolet. Thredolets are used for low-pressure 90-degree pipe branches. The branch pipe is screwed on the Thredolet, which is welded on the run pipe. The threading is generally of the NPT type and conforms to the ASME B1.20.1 specification.

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The MSS-SP 97 specification covers the dimensions, the finishing, the tolerances, the testing methods and procedures, the marking, the material grades, and the minimum tensile strength requirements for 90-degrees integrally reinforced forged branch outlet fittings (welded and threaded). The connection resulting from using branch fittings complies to ASME B31.1 and ASME B31.3 power and process piping codes.Pipe branch fittings are used to create integrally reinforced connections from a run pipe (header pipe) to an outlet pipe, at 45 or 90 degrees, alternatively to connections made with buttweld tees, reinforcing pads and saddles. This type of forged fittings are otherwise called “branch connections”, or “branch fittings”, or “pipe branch outlet fittings” or, simply, “Olets”. How are they installed? Quite easily: on one side, the fittings (example a Weldolet) is fixed onto the run pipe with a full penetration groove weld and, on the other side, welded (or screwed) on the branch pipe. Of course, the header pipe shall be properly cut in the proximity of the area where the pipe needs to be branched.

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Thredolets belong to the “threaded fittings” family and are available in classes 3000# and 6000#. Threadolets are used for smaller pipe sizes and low-pressure applications. Outlet fittings are forged products with high strength and clear cost advantages over conventional pipe branching techniques. The use of branch fittings instead of conventional fittings (buttweld tee, reinforcing pads and saddles) has the following advantages (example Weldolet): Sweepolets are contoured, integrally reinforced, buttweld branch fittings used for low stress and long fatigue service. The welded connection on the run pipe side can be easily inspected with radiographic examination (RX or RT), ultrasounds (UT) and other non-destructive tests. OLETS DIMENSIONS WELDOLET