Laserfiche WebLink
C. The following nondestructive test procedures are applicable to fusion <br />seaming and shall be followed by Contractor. <br />1. Seal one end of the seam to be tested. <br />2. Insert needle or other approved pressure feed device through the <br />sealed end of the channel created by the double wedge fusion <br />weld. <br />3. Energize the air pump to verify the unobstructed passage of air <br />through the channel. <br />4. Seal the other end of the channel. <br />5. Energize the air pump to the pressure of approximately 30 psi <br />(210 kPa), close valve, and sustain pressure for approximately <br />five (5) minutes. <br />6. If loss of pressure exceeds 3 psi or 10% of the initial pressure, or <br />pressure does not stabilize, locate faulty area, repair, and retest. <br />7. Puncture opposite end of the seam to release air. If blockage is <br />present, locate and test seam on both sides of blockage. <br />8. Remove needle or other approved pressure feed device. <br />9. Repair pressure test locations as described in Section 3.10. <br />10. Beginning and ending pressures and times, test locations, <br />documentation number, date, and tester will be indicated with an <br />indelible marker on the liner at each test interval location. <br />D. The following procedures shall apply to locations where seams cannot be <br />non - destructively tested, as determined by Design Engineer: <br />1. If the seam is accessible to testing equipment prior to final <br />installation, the seam shall be non - destructively tested prior to <br />final installation. <br />2. If the seam cannot be tested prior to final installation, the seaming <br />operations shall be observed by CQA Monitor for uniformity and <br />completeness. <br />Rio Grande Silver Tailings Evaporation Pond <br />02620 -20 Geosynthetic Liner <br />August 2011 02620 <br />