Geomembrane welding below freezing

June 1st, 2023

Q: Can geomembrane welding be done below freezing (32 degrees Fahrenheit [0 degree Celsius])? If it can be done, is there a method or preferred procedure to assure its success? A: If the soil beneath the geomembrane is frozen, the heat from the welders may thaw moisture from the subgrade and allow water to condense […]

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The GMA Techline

February 1st, 2020

Moderated by George R. Koerner and Y. “Grace” Hsuan DARCIAN PERMEABILITY Q: I am aware of the section in your book regarding geomembrane “permeability” and get from it that it aims to calculate an equivalent Darcian permeability using vapor diffusion via Fick’s law. Can one use the derived permeability then when calculating flow using Darcy’s […]

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Leister introduces SEAMTEK W-900 AT low-voltage wedge welder

October 12th, 2018

Leister Technical Textiles has released the SEAMTEK W-900 AT low-voltage wedge welder, an energy efficient and safe welder with direct transmission of power to a thin welding wedge. The W-900 welds at a speed of 98 feet (30 m) per minute, uses no energy when in standby mode, can reach the desired target temperature in […]

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