2006-017-RES-PLANO - Laserfiche WebLink

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above 50 psig. 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 outlet manifold of 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. An outlet manifold shall also have provision for connection of a dual-purpose airline supply for extended duration use while reserving the cylinder supply for egress and for connection to a similar system to allow supplying air between two SCBA's. The auxiliary hose shall be located on the primary wearer's right hip and be terminated with a dual male-female quick connect fitting which can be easily connected and disconnected by trained individuals with a gloved hand and in low light conditions. Each portion of the quick connect fitting shall have a check valve to prevent the loss or air. Each coupling shall also be guarded against inadvertent disconnect during use of the equipment. When operated in this mode, supplying two breathing regulators, the primary wearer's pressure reducer shall be capable of simultaneously supplying each regulator with a flow of at least 200 liters per minute while maintaining positive pressure in the respective facepieces. When used with an airline supply hose the length shall be up to 300 feet and require an inlet pressure range of 60 to 115 psig, depending on the length of supply hose used. A check valve within the outlet manifold shall prevent the external release of cylinder air in the event the airline supply is either not use or disconnected. Switching from airline supply to cylinder supply shall be accomplished manually by the user, by opening the cylinder valve to prevent inadvertent use of the cylinder supply without the user's knowledge. Rapid Intervention CrewfUniversal Air Connection (RICfUACl The SCBA shall incorporate a RICIUAC fitting to be compliant with the 2002 edition of the NFPA 1981 Self-Contained Breathing Apparatus standard. The RIC/UAC shall be an integral part of the first stage pressure reducer. The RICIUAC inlet connection shall be within 4" (4 inches) of the tip of the CGA threads of the cylinder valve. The RIC/UAC shall consist of a connection for attaching a high-pressure air source and a self-resetting relief valve allowing a higher pressure than that of the SCBA to be attached to the SCBA. The RICIUAC shall have a check valve to prevent the loss of air when the high-pressure air source has been disconnected.