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<br />1 ~ FIELD SEAM FAILURE <br />1 Should failure occur through excessive leak down over the scheduled time pedod, check both ends of seam <br />to insure proper seal and retest Should failure reoccur, check the top fusion seam by applying a constant <br />flow of air pressure >D void or air channel Moc a strong solution of liquid detergent and water and apply an <br />ample amount fo the top fusion weld. Arty failure or leak will be indicated by continuous bubbles appearing. <br />If no failure appears in the Wp fusion seam area, check systematically by isolating random sections of the <br />seam This should be accomplished in one hundred and fifty linear foot sections of seam. Then retest each <br />t section by pressure testing until the leak is located. Repair failed seam area by extrusion welding the outside <br />edge of the bop fusion weld between areas of failure. Then vacuum test repa'v seam area. All repairs should <br />be completed in accordance with Qualify AssurencxJQuality Control Manual. <br />PEEL TEST FOR HOT WEDGE SEAM WELD <br />t , <br />This test is the most severe test that a seam can be subjected to. The peel test is the greatest proof that a <br />seam will have the strength to last the life of the flexible membrane liner (FML). The mechanical procedures <br />of the peel test are as follows: <br />Procedure: <br />1. All testing of desbvctive samples of fusion seam will be in accordance with ASTM D413 and ASTM <br />D638. <br />2. Seam sample cut approximately one inch wide by approximatey six inches bng. <br />3. Only the inner weld track is peeled apart in this destructive test The outer track (directly at sheet <br />edge) is for the purpose of air pressure testing ppabil'~ties. <br />4. Clamp bottom tabs into the testing machine (Field Tensiometer or Lab Instron), tum on machine and <br />pull the seam. <br /> <br />~.. <br /> <br /> <br />1 <br />21 <br /> <br />