Professional Hdpe Fusion, Liner Pipe and HDPE Fusion Process

Figure 1 :
Two lengths of 4" liner pipe have been fused together using a fusing machine.

Figure 2 :
Fusion enclosure or "tent" used to shelter fusing process from wind and rain.

Figure 3 :
HEBNA-Hybrid® HDPE Liner Compression System; the liner's diameter is reduced by pulling it through the "compression system" with a wireline unit. The "compression system" is comprised of a series of progressively smaller rollers and dyes. The HEBNA-Hybrid® compression system reduces the amount of tension required to pull the liner through the "compression system"

Figure 4 :
HDPE flanges [stub ends] are fused to the ends of each section of the HDPE liner. The stub-end is protruding past the end of the host pipe's steel flange. Each section of the pipeline, with its new HDPE liner, is hydraulically tested after the steel flanges are bolted together to insure the integrity of the liner.

HDPE liners are custom made to exacting specifications by an extrusion process at an HDPE Pipe manufacturing plant. The liner is made to a size slightly larger than the inside diameter of the intended host pipe. Liner pipe is usually manufactured in discreet lengths, that will be fused together in the field. Smaller diameter pipe are sometimes supplied in reels that require far fewer fusion joints.

The fusion process is a critical step in the "installation" of an HDPE liner [see Figure 1]. HEBNA shields its fusion process from the wind and rain using a specially designed enclosure called a "tent". The "tent" insures that the fusion process is carried out in a controlled thermal environment. An adequate heating and cooling period is required for optimal HDPE fusion [see Figure 2].

After liner pipes have been fused together into sections, the liner must be reduced in diameter via compression, to a diameter slightly smaller than the inside diameter of the host pipe [see Figure 3]. The liner is pulled through the "compression system" and into the host pipe by a wireline unit. The elastic properties of HDPE cause it to expand slowly and conform to the inner walls of the host pipe.

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