U.S. Pipe Fabrication

High Pressure Restrained Pipe With Deflection

The HDSS® pipe is the newest addition to the U.S. Pipe ductile iron pipe product line. It was designed as a high pressure restrained pipe with added deflection. HDSS® pipe can provide a true 350psi working pressure with a flexible restrained push-on joint for 12″, 16″, 20″, 24″, 30″, 36″, and 42″ ductile iron pipe (48″ in 2021). The HDSS Restrained Joint has a working pressure rating that matches the class of pipe it is used with. 30″ through 48″ HDSS provide up to 2.5 and 2.0° deflection respectively, 16″ through 24″ HDSS provides up to 4° deflection, and 12″ provides up to 5° deflection to allow for alignment and settlement issues in buried applications. The simple robust design, high deflection coupled with the strongest joint on the market also make it ideal for; bridge piping, horizontal directional drilling (HDD) and pipe bursting applications.

To facilitate quick, easy and trouble free installation, ductile Iron locking segments are inserted through a single slot in the bell face and slid into position around the bell to provide a positive axial lock between the bell interior surface and a retainer weldment on the spigot end of the pipe. A rubber retainer installed between the locking segments completes the installation and insures the segments stay in place while the joint is extended to engage the restraint. The HDSS joint can be easily disassembled by reversing the installation procedure with no need of special tools or shims.

HDSS Pipe utilizes the conventional TYTON JOINT® Gasket for reliable sealing. HDSS spigot ends are compatible with 12″–36″ TR FLEX® Pipe and Fittings. When 30″-36″ TR Flex Fittings are used the fitting joint rating will be 250 psi or less depending on the class of pipe used. 12″, 16″, 20″ and 24′ TR FLEX fittings have a 350 psi joint rating depending on the class of pipe used. HDSS is available with a variety of coatings and linings, including metallic zinc coating.