HP LOK® Pipe & Fittings
U.S. Pipe’s HP LOK® Restrained Joint Pipe and Fittings offer flexible push-on joints for 42"–64" ductile iron pipe, providing a working pressure equivalent to the parent pipe, with a maximum rating of 350 psi.
Designed for water and wastewater service, HP LOK systems use the Tyton® Gasket along with a factory-installed HP LOK Ring in the bell, ensuring a positive axial lock with the retainer weldment on the spigot end.
Pipe for wastewater applications can be supplied in accordance with ASTM A746 standards. For aggressive service conditions, a PROTECTO 401™ ceramic quartz-filled, amine-cured epoxy lining is available. Standard cement-mortar linings meet ASTM C150 Type II, with options for single or double thickness and sulfate-resistant Type V cement available on request.
HP LOK joints conform to ANSI/AWWA C111/A21.11 rubber-gasket joint standards and are manufactured to ANSI/AWWA C151/A21.51 ductile iron pipe specifications. Fittings meet ANSI/AWWA C153/A21.53 or C110/A21.10 requirements, with cement-mortar lining per ANSI/AWWA C104/A21.4 and asphaltic exterior coatings per relevant ANSI/AWWA standards.
Design engineers can refer to DIPRA’s “Thrust Restraint Design for Ductile Iron Pipe” or U.S. Pipe’s “Use and Application of Restrained Joints” brochures for guidance on restraining thrust in pressurized buried systems. When installed in potentially corrosive soils, polyethylene encasement per ANSI/AWWA C105/A21.5 is recommended for external protection.
HP LOK® Pipe and Fittings combine high-pressure performance, reliable restraint, and adaptable lining and coating options to deliver durable, safe, and code-compliant solutions for large-diameter water and wastewater pipelines.
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