2006-017-RES-PLANO - Laserfiche WebLink

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that no stem packing or packing gland nuts are required. It shall contain an upper and lower seat such that the pressure will seal the stem on the upperseat, thus preventing leakage past the stem. No adjustment shall be necessary during the life of the valve. The SCBA shall maintain all NIOSH and NFP A standards with any cylinders provided by the original SCBA manufacturer. Carbon cylinders The cylinder shall be manufactured in accordance with DOT specifications and have a working pressure of 4500 psig. The cylinder shall be lightweight, composite type cylinder consisting of an aluminum alloy inner shell, with a total overwrap of carbon fiber, fiberglass and an epoxy resin. Cylinders shall be "30 minute" duration, 283 cubic inch water capacity, 45 SCF. Facepiece Assembly The full facepiece assembly shall fit persons of varying facial shapes and sizes with minimal visual interference. It shall be available in three color-coded sizes and maintain NIOSH/MSHA certification of the apparatus regardless of the size used. The color-coded face seal shall be constructed of a blend of proprietary material and be secured to the lens by a V-shaped channel frame that is retained to the lens using two fasteners. The lens shall be a single, replaceable, modified cone configuration constructed of a non-shatter type polycarbonate material and be designed to meet the impact and penetration requirements of a faceshield as specified in ANSI Z87.1 paragraphs 5.2.8.1 and 5.2.8.2. The lens shall have a silicone based coating to resist abrasion and chemical attack and meet the requirements ofNFP A- 1981, for lens abrasion and have an anti-fog coating to reduce fogging in stand-by mode. The facepiece shall have a large diameter inlet serving as the female half of a quarter (1/4) turn coupling which mates with the positive pressure breathing regulator. Multi-directional voicemitters shall be lens mounted on both sides of the facepiece lens and ducted directly to an integral silicone nosecup to enhance voice transmission and minimize fogging of the lens. The voicemitters, ducts and nosecup shall be easily removable without the use of tools. The facepiece shall be a minimum of four sizes of nosecups. The head harness shall be a six-point quad suspension made in the fashion of a net hood to minimize interference between securing of the facepiece and the wearing of head protection and be constructed of a para-aramid material. Two flame resistant elastic straps, attached to the lens in four locations, shall provide adjustment for proper face sealing. A six-point attachment rubber head harness shall also be available. Pressure Reducer The pressure-reducing regulator shall be mounted on the backframe and be coupled to the cylinder valve through a stainless steel quick connect snout for engagement and sealing within the cylinder valve outlet. The cylinder shall be secured to the pressure-reducing regulator with two pull-rings 180 degrees from each other. Two stainless steel rods shall secured the pull-rings. The stainless steel rods shall be actuated when the cylinder is opened and when cylinder pressure is