Laserfiche WebLink
B. Seam Layout. <br /> 1. Orient seams parallel to line of a maximum slope,i.e.,orient down not across <br /> slope. <br /> 2. Minimize number of field seams in corners,odd-shaped geometric locations <br /> and outside corners. <br /> 3. Keep horizontal seams (seams running approximately parallel to slope <br /> contours)at least 5 feet away from toe or crest of slope,unless approved by <br /> DESIGN ENGINEER. No horizontal seams shall be allowed on the slope. <br /> 4. Use seam numbering system compatible with panel number system. <br /> 5. Shingle panelson all slopes and grades as directed by QA/QC <br /> CONSULTANT. <br /> 6. Longitudinal seams shall not be allowed in the LCRS trenches. <br /> C. Seam Welding Personnel. <br /> 1. Provide at least one welder(master welder)who has experience welding over <br /> 5 million square feet of geomembrane using the same type of welding <br /> apparatus in use at site. <br /> 2. Qualify personnel performing welding operations by experience and by <br /> successfully passing field welding tests performed on site. <br /> 3. Master welder will provide direct supervision over other welders. <br /> D. Seam Welding Equipment. <br /> 1. Extrusion welder: equipped with gauges showing temperatures in extruder <br /> apparatus and at nozzle. Temperature at nozzle may be measured by external <br /> temperature gauges. <br /> 2. Hot wedge welder:: Automated variable speed vehicular mounted devices <br /> 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 /> Forward Landfill WMU FU-13 HIGH DENSITY POLYETHYLENE <br /> 02778 14 (HDPE)GEOMEMBRANE <br />