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<br />' 3.3.2 Seaming Equipment and Products <br /> The approved processes for field seaming are extrusion welding and fusion (hot wedge) welding. <br /> Proposed aRemate processes shall be documented and submitted to the Owner or his <br />' representative for his approval <br />' A wedge weld detail is provided in Diagram D-3. <br /> 3.3.3 Weather Conditions for Seaming <br />t The normally required weather conditions for seaming are as follows: <br /> The high temperature Gmit for welding is the temperature at which the well-being of the crew <br />' becomes uncertain. <br /> Unless authorized in writing by the Project Manager, no seaming shall be attempted at ambient <br />' temperatures below 5' Fahrenheit. <br />' <br /> from wind. <br />to ail cases, the geomembrane shall be dry and protected <br />t CLI shall verify that these weather conditions a2 adequate for seaming and will advise the Project <br /> Manager if they are not The Project Manager shall then decide if the installation shall be stopped or <br /> postponed. <br />' Cold Weather Seaminc of PolyethVlene Liners <br /> To guarantee quality welding in cold weather, the following procedures are recommended for CLI <br />' welds: <br /> The CLI exWsion welder is capable of continuously monitoring and controlling the temperatures of <br /> the exWdate and the zone of contact for independence of environmental conditions. To control the <br />' molten bead temperature accurately and to ensure no fluctuation out of the predetermined range the <br /> machine has: <br /> a. An over capacity heater band on the extruder. <br /> b. An extra over ppacity heater band on the nozzle. <br />1 <br /> c A separate proportional temperature controller for each heater band. <br />' d. The nozzle thermocouple positioned approximately 1/8 inch from the end of the nozzle <br />which rides on the sheet <br />' Temperature controls can be adjusted to guarantee a fully integrated weld as demonstrated by <br />destructive testing. <br />The sheet should be preheated before welding any time ice crystals are present in the weld path. <br />When strong winds are present, a shield should beset in place to prevent large heat bsses tram the <br />welding gun during seaming. <br />' Test welds should always be conducted prior to seaming in order to determine appropriate welding <br />conditions. <br />' 7 <br />1 <br />