1. Inspect and clean pipe and gasket. Ensure they are in good order, free from debris. Grind or file sharp edges that could damage the gasket when it is inserted. Carefully remove foreign matter such as tar or paint in the gasket groove.
In cold weather (40° F/4.4° C) it is more diffiult to clean surfaces but the removal of ice, dirt and debris is still required. Warming cold, stiff gaskets will ease assembly.
2. Insert the gasket. (Fig. 2) Loop the gasket and insert the rounded bulb-end first, placing the gasket heel in the retainer seat. Make sure not to install the gasket behind or underneath the retainer seat. Release the loop to allow the gasket to expand into the recess. Check with your fingers to be certain it is properly seated. Large gaskets may require multiple loops evenly spaced around the gasket.
3. Lubricate the spigot end and gasket. (Fig. 3) Apply a thin film of joint lubricant to the outside of the spigot end and to the surface of the gasket that will contact the spigot end. Do not lubricate the bell socket of the pipe or the surface of the gasket that contacts the bell socket.
4. Join the spigot end to the bell. (Fig. 4) Ensure the plain end of the pipe is beveled (See section on Field Cut Pipe) - square or sharp edges may damage or roll the gasket. Insert the spigot end into the bell and keep both sections of the pipe aligned without deflection. Insert pipe until the entire first assembly stripe has disappeared into the bell. After insertion to the first assembly stripe, the pipe can be deflected (See Table 2). Use a feeler gauge to ensure that the gasket has not been dislodged from proper placement during installation.
5. Reverse the assembly force. (Fig. 5) Apply a setting force in the opposite directon of assembly to engage teeth. Up to 0.25" of extension can be expected to set teeth. If the joint does not assemble properly, disassemble it and check for debris, proper positioning of the gasket, and adequate lubrication.
NOTE: The Gripper Gasket™ is not to be reused.
Use in casings: Pipelines restrained with Gripper Gaskets™ may be installed in straight casings by pulling, not pushing, the pipe through the casing. Assembly of the joints must be controlled, such as with come-a-longs or cable hoist, to prevent fully “homing” spigot to base of the socket to allow for joint deflection.
Bevel the edge of the field cut pipe ¼" at a 30° angle. Round the leading edge and remove sharp edges which could damage the gasket. When cut pipe with no assembly stripes is to be assembled, the spigot insertion depth should be marked on the spigot to ensure that the joint is fully assembled (See Table 2).
When deflection is required at the joint, the spigot should not be completely homed.
| Nominal Pipe Size
| Pipe Diameter
| Pipe Circumference
Table 1. Suitable Pipe Diameters for Field Cuts and Restraint Joint Field Fabrication
| Pipe Size
| Location Of Assembly Mark
| Maximum Joint Deflection
| Maximum Deflection Per Joint
|18 ft. Laying Length||20 ft. Laying Length|
Table 2. Assembly Mark and Deflection
Tyton® and Field Lok® are registered trademarks and properties of United States Pipe and Foundry Company, LLC. Gripper Gasket, LLC is not affiliated in any way with United States Pipe and Foundry Company, LLC.