RAM Lining Systems Inc.

High Density Polyethylene Geomembrane Liner (H.D.P.E.)

Background and characteristics:

The bottom line is the H.D.P.E. is one of the most cost effective lining materials available today.


Test Methods:

Seams can be tested during installation of liner to ensure integrity. Typical tests performed are listed below:

  1. High pressure air test
  2. Qualification and production weld testing utilizing tensiometer peel and tensiles test, visual inspection and the vice grip peel test
  3. Vacuum box soap test for extrusion welds
  4. Spark testing

Seaming Process:

Fusion: Use of hot wedge welder which heats the parent materials to a molten state and then compresses the materials so that they adhere to each other and form a unified parental bond. Double seams about one inch apart are formed with an intermediary air space. This air space can then be filled with air to test the integrity of the seam. The wedge welder is portable and is used on site for all production runs.

Extrusion: Welding rod comprised of the parent material is fed into a hand held gun and heated to its melting point. The molten bead is laid on to an overlapped seam area that has been pre-tacked, ground to remove oxidized surface material, and preheated by a hot air nozzle attached to the extrusion gun. The resulting butt seam at a “T” intersection ensures integrity of the seam at an area where the wedge welder is not able to produce a uniform seam. Extrusion welding is also used around any appurtenances that may penetrate the liner.

Copyright © 2006 RAM Lining Systems Inc. All rights reserved. Website by Hall Associates.