Weldolet, Threadolet, Sockolet ASTM A403 GR.WP304/304L MSS SP-95

PIPE BRANCH 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 are otherwise called “branch connections”, or “branch fittings”, or “pipe branch outlet fittings” or, simply, “Olets”.

Outlet fittings are forged products with high strength and clear cost advantages over conventional pipe branching techniques.

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.

The use of branch fittings instead of conventional fittings (buttweld tee, reinforcing pads and saddles) has the following advantages (example Weldolet):

• Just 2 welds are needed, instead of 3 (less work and weld inspections)

• Accelerated installation time

• Less space is required, making the piping system design more flexible

• The flow is fully unrestricted, due to the funnel design

Reinforced branch connections are manufactured in a wide range of sizes (to accommodate most size on size or reducing connections), types/designs, connection types (buttweld, socket weld, threaded), and in a wide range of 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 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.

The types of ends of an outlet fitting shall comply to ASME B16.25 (buttweld ends), or ASME B16.11 (socket weld and threaded ends).

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