Installation Instructions Models 230/231 HDPE Pipe Stiffener Field Guide
Read instructions before starting installation* For purposes other than water, contact JCM Industries for application and product assistance.
High Density Polyethylene Pipe is produced as an extrusion. This process has a specific cooling process at the extruded die exit point and therefore has a tendency to experience “toe-in” (where the ends of the pipe turn inward for approximately 1.5” in length from the pipe end backwards). This is due to residual stress that is introduced in the polyethylene while being cooled. This can occur at both the point of manufacture or when the pipe is field cut. Toe-In is more prominent in large diameter HDPE and is less of a problem in smaller sizes because of the amount of reduction and the smaller, more flexible pipe will move easier. The larger and thicker pipe walls close down more and are less capable of expanding to accept the snug fit of the 230/231 Stiffeners. During installation, pipe ends should be inspected for excessive Toe-In, if the amount of Toe-In prevents the 230/231 stiffener from being inserted into the pipe I.D., following are simple field actions that can be performed to complete the installation. Tips for Dealing with Toe-In: 1. Use a router, rasp, or other grinding/sanding tool to remove toe-in in the inside of the pipe end. 2. Only remove toe-in where necessary to insert stiffener. 3. Only remove enough toe-in to allow for insertion of stiffener. 4. Remove toe-in evenly around the I.D. of the pipe. Do not remove more from one side than the other. 5. A snug fit of the stiffener is acceptable. 6. In instances with extreme Toe-In, pipe ends can be cut off and the stiffener inserted immediately. Cutting off the reduced diameter section of the pipe can temporarily eliminate the toe-in, however due to the viscoelastic nature of polyethylene, the toe-in will reappear after a given time period.
For additional guidance, contact JCM Industries Technical Services at 1-800-527-8482.
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