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IX-FL�VI/ The XIGAT"' Concept and Operation Manual <br /> Element repair procedure <br /> Module testing: <br /> • Close one permeate outlet with the blind test adapter. ' <br /> • Connect the other permeate outlet to a pressurised air or gas supply <br /> (pressure between 0 and 3 bar). <br /> • Submerge the module under water in a test basin. ::`t• ,•.•.0. <br /> • Soak the module for at least 2 minutes and let all air escape. 4 <br /> • Slowly pressurise the gas on the permeate side to 0.3 bar. Entrapped <br /> air will escape as air bubbles from the bore of the fibres. This will <br /> take a few minutes. <br /> • If a constant flow of air bubbles escapes from the bore of the fibre, this <br /> indicates a defect fibre. <br /> • Gently press a pin into the bore of the defective membrane fibre by <br /> hand (approx. 3-4 mm) on both sides of the module. <br /> • Repeat this procedure until all defective fibres are closed. Make sure ' " <br /> all compromised fibres are correctly marked. <br /> • Remove the membrane element cautiously from the test basin, <br /> keeping the pins in place. <br /> Membrane repair procedure <br /> • Take a new pin, hold the head of the pin and just dip the shaft of the <br /> pin in a drop of Locktite 406 (fast curing single component adhesive) <br /> for about one second. <br /> • Quickly insert the pin with Locktite 406 in the bore of the marked fibre(s) and press firmly. <br /> • Cut the protruding part of the pin equal to the potting mass surface with a sharp knife or other sharp cutting tool <br /> without damaging the potting mass. <br /> • Cautiously remove white Locktite 406 stains around the pin repair with a sharp knife or other cutting tool without <br /> damaging the potting mass. <br /> • Repeat the element testing procedure to check the effectiveness of the repairs. <br /> CAPF-XIGA-0143 <br />