ASTM WK35773

    New Specification for Polyethylene Reducing Tee Massive Base Branch Saddles (MBBS) for Outlet Diameters in Nominal Pipe Sizes 2-inch to 36-inch, for Sidewall Heat-Fusion to Polyethylene Pipe Mains.

    (What is a Work Item?)

    Developed by Subcommittee: F17.10 | Committee F17 | Contact Staff Manager


    1. Scope

    This specification covers the pipe grade polyethylene materials, standard outlet dimensions, and MBBS design equations to provide reducing tees with a pressure rating equal to that of the pipeline to which the MBBS is heat-fusion joined. The MBBS may made by molding polyethylene resin, or by machining from axially extruded solid-wall polyethylene tubes.

    Polyethylene pipe and fittings have been sold for 50-years. There are no uniform standards to which reducing tees are designed and fabricated. For the protection of pipeline owners and the public at large, standard design equations and standard dimensions must be provided for branch outlets to assure fully pressure rated reducing tees.


    Branch saddle; branch outlet; reducing tee; sidewall fusion; area replacement method; ASME B31.3; ASME B31.1

    The title and scope are in draft form and are under development within this ASTM Committee.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Harvey Svetlik

    Draft Under Development