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"NWILI <br />a. Personnel working on such tanks will wear rubber boots, fresh air masks, life lines, and <br />clean clothing with no metal buttons or fittings. A copper rivet will be driven into the heels <br />of rubber boots to provide a ground or discharge of static electricity which may accumulate <br />on personnel wearing safety equipment. <br />b. Fresh air will be supplied to the mask through a hose with a positive displacement air <br />blower to the windward side of manhole in tank. Adequate power operated blowers a -re <br />responsible for the air supply until personnel wearing mask have left tank and removed face <br />piece. Securely attach one end of rope to the harness or body of the individual with the <br />other end being held by an attendant stationed on the tank to assist in his removal, if <br />necessary. <br />XOIM� L%NjjLA&,U I R E M E IXT S: <br />R. Canister type masks will not be used in lieu of masks equipped with hose supplying fresh air. <br />b. Use non-ferrous tools for cleaning surfaces of rust, sediment, etc. <br />c. Use only cotton cloths for cleaning purposes. Other cloths tend to generate static electricity. <br />d. Lights of approved explosion -proof type only wiU be used. <br />e. Discontinue cleaning operations while electric storm is threating or in progress. <br />Personnel on this operation are prohibited from wearing wool, nylon, sili, rayon, and/or <br />other static producing materials. Cotton cloth, is the only recommended type of clothing. <br />E*.YM <br />