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U.S. Pipe. - a subsidiary of Mueller Water Products, Inc.
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TR FLEX - Ductile Iron Pipe and Fittings

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TR FLEX Pipe and Fittings provide flexible restrained push-on joints for 4` through 36` Ductile Iron pipe and fittings. The TR FLEX Restrained Joint has a working pressure rating equivalent to the working pressure rating of the parent pipe, with a maximum restrained joint working pressure rating of 350 psi except that 30”-36” have a 100 psi reduction in joint rating for a given parent pipe pressure class e.g. 30-36” TR FLEX Restrained Joints are rated for a maximum 250 psi with Pressure Class 350 parent pipe. Conversely, a 24” PC 200 pipe will have a restrained joint rating of 200 psi.

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For fire protection service, 4" through 12" pipe and fittings are listed by Underwriters Laboratories for 350 psi and are approved by Factory Mutual for 250 psi.TR FLEX Pipe and Fittings utilize the conventional TYTON® Gasket for 4" through 36" sizes.Ductile Iron locking segments, inserted through a slot (or slots) in the bell face, provide a positive axial lock between the bell interior surface and a retainer weldment on the spigot end of the pipe.The standard cement-mortar lining supplied in pipe is ASTM C150 Type II. The lining may be supplied in either single or double thickness. Sulfate resistant Type V cement is available on special order.*For higher pressure ratings, consult your U.S. Pipe Sales Representative.For a suggested design procedure for the restraint of thrust forces in pressurized, buried Ductile Iron piping systems, the design engineer should refer to the current DIPRA publication "Thrust Restraint Design for Ductile Iron Pipe" or the U.S. Pipe Brochure "The Use And Application of Restrained Joints for Ductile Iron Pipelines."

Each of the following is a nationally recognized standards organization:

  • American National Standards Institute (ANSI)
  • American Water Works Association (AWWA)
  • American Society for Testing and Materials (ASTM)
  • Underwriters Laboratories (UL)
  • National Fire Protection Association (NFPA)
  • National Sanitation Foundation (NSF)
  • Factory Mutual (FM)