Spray the soap solution on the top of the seam, and place the vacuum box over the wetted seam area. Ensure that a leak tight seal is created. Maintain a vacuum of approximately 3-5psi for 15 seconds. Examine the liner through the viewing window for the presence of soap bubbles. All areas where soap bubbles appear should be marked and repaired.
Air Pressure Testing for Double Fusion Welded Liner
Seal both ends of the tested seam. Insert needle or other approved pressure feed device into the channel created by the double-wedge fusion weld. Energize the air pump to a pressure between 20-35 psi, close the value, and sustain the pressure for at least 5 minutes. If pressure loss exceeds the allowable drop or does not stabilize, locate the faulty area, repair and retest.
