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<br />1 - Air pumps equipped with a pressure gauge capable of generating and sustaining a <br />_ pressure between 25 to 30 psi; and <br />- Sharp hollow needles or other pressure feed devices approved by the Quality Assurance <br />Engineer. <br />To perform the test, the Contractor shall: <br />- Pass air through the channel to guarantee a clear pathway; <br />' - Seal both ends of the seam to be tested; <br />1 - Insert a needle or other approved pressure feed device into the tunnel created by double <br />hot wedge seaming; <br />' - Energize the air pump to 25 to 30 psi; and <br />' - Close the valve and sustain the air pressure or a minimum of five minutes. <br />If the loss of pressure exceeds 2 psi or does not stabilize, faulty areas shall be located and <br />repaired. After testing, pressure feed devices shall be removed and insertion points sealed. All <br />pressure testing shall be documented by the QC Technician and submitted to the Quality <br />' Assurance Engineer at the end of each work shift. Alternative testing methods other than vacuum <br />or pressure testing may be proposed by the Contractor and will be subject to the approval of the <br />' Quality Assurance Engineer prior to their use. <br />4.2.12.3 Destructive Seam Sampling <br />For destructive seam testing, the Quality Assurance Engineer shall be provided with a minimum <br />of one destructive sample per 500 feet of seam length. The location shall be selected by the <br />Quality Assurance Engineer and the Contractor shall not be informed in advance of the sample <br />location. The Contractor shall visually observe, mark and repair suspicious looking welds before <br />' release of a section to the Quality Assurance Engineer for destructive sample mazking. The <br />Contractor shall cut samples as seaming and non-destrucdve testing progresses. and prior to <br />' completion of liner installation, shall mazk samples with consecutive numbering and seam <br />location numbers. The Contractor shall record, in written form, date, time, locatiion, roll seam <br />number, ambient temperature, seaming unit number, name of seamer, welding apparatus <br />temperatures, and pass or fail description. The Contractor shall immediately repair holes in <br />1 '~- <br /> <br />