Olet Fittings

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 is otherwise called “branch connections”, or “branch fittings”, or “pipe branch outlet fittings” or, simply, “Olets”.

Forged steel materials:
carbon steel (ASTM A105 for high-temperature, A350 LF2/LF3 for low-temperature)
alloy steel (ASTM A182 Grades F5, F9, F11, F22)
stainless steel (ASTM A182 F304, F316, and other SS grades)
nickel alloys (Inconel, Monel, Incoloy, etc).

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 a 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.