Resolution 2014-73 - Laserfiche WebLink

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The regulator shall connect to the facepiece by way of a quarter (1/4) turn coupling. The user shall hear an audible sound when the regulator is attached correctly to the facepiece. The regulator shall be equipped with a doughnut- shaped gasket which provides a seal against the mating surface of the facepiece. The regulator cover shall be fabricated of a flame resistant, high impact plastic. The breathing regulator shall have a demand valve to deliver air to the user, activated by a diaphragm responsive to respiration. The demand valve shall use an extended temperature range dynamic O -ring seal composed of a fluorosilicone elastomer. The diaphragm shall include the system exhalation valve and shall be constructed from a high strength butyl elastomer. A purge valve shall be situated at the inlet of the breathing regulator and shall be capable of delivering airflow of between 125 and 175 standard liters per minute. The breathing regulator shall be arranged to direct the incoming air over the inner surface of the facepiece for defogging purposes. The components of the breathing regulator shall be constructed of materials that are not vulnerable to corrosion. The flame resistant cover shall contain an air saver switch and pressure demand bias mechanism. It shall reactivate and supply air only in the positive pressure mode when the wearer affects a face seal and inhales. This device shall not affect the breathing flow though the system while in operation. CONFIRM EXCEPTION 3) Pressure Reducer with CGA Cylinder Connection The pressure- reducing regulator shall be mounted at the waist on the backframe and be coupled to the cylinder valve through a short length of internally armored high pressure hose with a hand coupling for engagement and sealing within the cylinder valve outlet. In lieu of a manual by- pass, the pressure- reducing regulator shall include a back -up pressure- reducing valve connected in parallel with the primary pressure reducing valve and an automatic transfer valve for redundant control. The back -up pressure reducing valve shall also be the means of activating the low - pressure alarm devices in the facepiece- mounted breathing regulator. This warning shall denote a switch from the primary reducing valve to the back -up reducing valve whether from a malfunction of the primary reducing valve or from low cylinder supply pressure. A press -to -test valve shall be included to allow bench testing of the back -up reducing valve. The pressure- reducing regulator shall have extended temperature range dynamic O -ring seals composed of fluorosilicone elastomer. The pressure reducing regulator shall have incorporated a reseatable over - pressurization relief valve which shall prevent the attached low pressure hose and facepiece- mounted breathing regulator from being subjected to high pressure. CONFIRM EXCEPTION 4) End -of- Service Time Indicator ( EOSTI) The SCBA shall have two end -of- service time indicators ( EOSTI), a tactile alarm and a Heads - Up Display (HUD). The primary EOSTI shall be the integral low- pressure alarm device that shall combine an audible alarm with simultaneous vibration of the facepiece. The primary EOSTI shall be located in the Facepiece- Mounted Positive Pressure Regulator. This alarm 3