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Nondestructive Testing of Geomembranes

Geosynthetic membranes or geomembranes are 0.5 to 2.5 mm (0.02 to 0.1 in.) thick sheets of plastic that are used to prevent liquid leakage to the environment primarily in landfills, ponds, mining leach pads, and tanks (Fig. 1). They are also used in wastewater treatment plants, potable water reservoirs, dams, canals and as floating covers. Leakage in geomembranes can cause pollution of groundwater, product loss, and even failure of containment systems. Leaks can easily occur because of inadequate installation, damage from construction activities, and damage while placing a protective layer of earth on the geomembrane. Nondestructive testing techniques are used for preservice testing of the seams and sheets for leaks. Often when a leakage problem is experienced, nondestructive leak location techniques are used to locate the leaks for repair.

References
  1. Nondestructive Testing Handbook, third edition: Vol. 1, Leak Testing. Columbus, OH: American Society for Nondestructive Testing (1998): p 592-597.
  2. ASTM D5641, Standard Practice for Geomembrane Seam Evaluation by Vacuum Chamber. West Conshohocken, PA: American Society for Testing and Materials (2011).
  3. ASTM D5820, Standard Practice for Pressurized Air Channel Evaluation of Dual Seamed Geomembranes. West Conshohocken, PA: American Society for Testing and Materials (2011).
  4. ASTM D7177, Standard Specification for Air Channel Evaluation of Polyvinyl Chloride (PVC) Dual Track Seamed Geomembranes. West Conshohocken, PA: American Society for Testing and Materials (2010).
  5. ASTM D4437, Standard Practice for Nondestructive Testing (NDT) for Determining the Integrity of Seams Used in Joining Flexible Polymeric Sheet Geomembranes. West Conshohocken, PA: American Society for Testing and Materials (2008).
  6. ASTM D6365, Standard Practice for the Nondestructive Testing of Geomembrane Seams using the Spark Test. West Conshohocken, PA: American Society for Testing and Materials (2011).
  7. ASTM D6747, Standard Guide for Selection of Techniques for Electrical Detection of Potential Leak Paths in Geomembrane. West Conshohocken, PA: American Society for Testing and Materials (2004).
  8. ASTM D7002, Standard Practice for Leak Location on Exposed Geomembranes Using the Water Puddle System. West Conshohocken, PA: American Society for Testing and Materials (2010).
  9. ASTM D7703, Standard Practice for Electrical Leak Location on Exposed Geomembranes Using the Water Lance System. West Conshohocken, PA: American Society for Testing and Materials (2011).
  10. ASTM D7240, Standard Practice for Leak Location using Geomembranes with an Insulating Layer in Intimate Contact with a Conductive Layer via Electrical Capacitance Technique (Conductive Geomembrane Spark Test). West Conshohocken, PA: American Society for Testing and Materials (2011).
  11. ASTM D7007, Standard Practices for Electrical Methods for Locating Leaks in Geomembranes Covered with Water or Earth Materials. West Conshohocken, PA: American Society for Testing and Materials (2009).
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