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Remove needle or other approved pressure feed device and seal. <br /> If pressure drop exceeds values tabulated herein or does not stabilize, locate <br /> faulty area and repair and re-test until defects are corrected and test values are passing. <br /> Pressure tested seams are recorded on Daily Progress Reports. <br /> TABLE 6.2 <br /> SEAM PRESSURE TEST ALLOWANCE <br /> Material Minimum Maximum Maximum psi <br /> Thickness psi Test psi Test Drop Allowed <br /> Pressure Pressure Afters Minutes <br /> 30 mil 30 30 4 PSI <br /> 40 mil 30 30 4 PSI <br /> 60 mil 30 30 4 PSI <br /> 80 mil 30 30 4 PSI <br /> 100 mil &Tricker 30 30 4 PSI <br /> 6.2.1 Pressure Test Failure <br /> Should excessive pressure drop occur, both ends of seam shall be checked to insure <br /> proper seal and be re-tested. Should failure reoccur, the top fusion seam shall be <br /> checked by applying a constant air pressure to the air channel and applying a soapy <br /> water solution over the weld length. Any failure or leak will be indicated by continuous <br /> bubbles appearing. <br /> If no failure appears in the top fusion seam area the seam shall then be systematically <br /> isolated into in one hundred and fifty linear foot sections of seam which shall each be re- <br /> tested by pressure testing until the leak is located. Failed seam areas shall be repaired <br /> by extrusion welding the outside edge of the top fusion weld between areas of failure. <br /> The extruded edge shall be vacuum tested in accordance with this manual. <br /> PART VH <br /> Destructive Seam Testing <br /> Destructive seam tests(if required by the project specification)shall be performed at <br /> random selected locations at a frequency of one sample per every 500 lineal feet of seam <br /> or as otherwise specified. Seam testing shall be conducted concurrent to the seaming <br /> work progress.The Owner's Representative if required, may select locations where seam <br /> samples are to be cut. If destructive seam tests are not required, representative seam <br /> samples may be substituted at a similar frequency using material samples of the actual <br /> material being installed so that no"damage"is done to the actual lining system requiring <br /> patching and testing, etc. <br /> Procedure <br /> Samples shall be cut by CLC as the seaming progresses. CLC shall: <br /> Cut samples. <br /> Assign a number to each sample, which is to be based upon seam and sample <br /> number and mark it accordingly. <br /> Created by Colorado Lining International 1-800-524-8672 10 <br />