Laserfiche WebLink
2. Hot wedge welder: Automated variable speed vehicular mounted devices <br /> 40 equipped with devices adjusting and giving temperatures at wedge. Pressure <br /> controlled by spring, pneumatic, or other system that allows for variation in <br /> sheet thickness. Rigid frame fixed position equipment is not acceptable. <br /> 3. Maintain adequate quality of welding apparatus in order to avoid delaying the <br /> project. <br /> 4. Use power source capable of providing constant voltage under combined line <br /> load. <br /> E. General welding procedures: <br /> 1. Do not commence welding until trial weld test sample, made with the <br /> equipment to be used passes trial weld test. <br /> 2. Clean geomembrane surface of grease,moisture,dust,dirt,debris, and other <br /> foreign material. <br /> 3. Overlap panels a minimum 3 inches for extrusion and 4 inches for hot wedge <br /> welding. <br /> 4. Do not use solvents or adhesives unless product is approved in writing by the <br /> DESIGN ENGINEER. <br /> 5. Provide adequate material on weld to allow peel testing of both sides of <br /> double wedge weld. <br /> 6. Extend welding to the outside edge of all panels. <br /> 7. If required,provide a firm substrata by using a flat board,a conveyor belt,or <br /> similar hard surface directly under the weld overlap to achieve firm support. <br /> 8. Provide adequate illumination if welding operations are carried out at night, <br /> and night operations are approved by the OWNER. <br /> 9. Cut fishmouths or wrinkles along the ridge of the wrinkle in order to achieve <br /> a flap overlap. Extrusion weld the cut fishmouths or wrinkles where the <br /> overlap is more than 3 inches. When there is less than 3 inches overlap, <br /> patch with an oval or round patch extending a minimum of 6 inches beyond <br /> the cut in all directions. <br /> 10. Log every 2 hours: <br /> a. Temperature directly on the geomembrane surface being welded. <br /> b. Extrudate temperatures in barrel and at nozzle (extrusion welder). <br /> C. Operating temperature of hot wedge (hot wedge welder) and any <br /> pressure adjustments made. <br /> d. Preheat temperature. <br /> e. Speed of hot wedge welder in feet per minute. <br /> FORWARD LANDFILL 02778 <br /> HIGH DENSITY POLYETHYLENE <br /> 15 (HDPE)GEOMEMBRANE <br />