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.
KeywordsBranch 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.Back to Top
Draft Under Development