Basic Firefighting: SCBA Review

Proper knowledge and use of self-contained breathing apparatus is necessary to help provide a safe working environment for the emergency service provider. Session Reference: Topic: Basic Firefighting: SCBA Review Level of Instruction: 3...


                        small firefighter profile

                     • Average unit weight - 23 lbs.

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              • 60 minute high pressure system

                       • Volume - 88 cu. ft. at 4,500 psi

                       • Cylinder is slightly larger than 30 minute low pressure

                       • Average unit weight - 30 lbs.

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• Cylinder valve and gauge

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• Markings - serial number, hydrostatic test date, DOT markings, fill pressure

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• Safety or over-pressure plug - if, during filling, the cylinder is over filled, a small metal disc will rupture and the air will escape to the outside

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• A full cylinder rated at 30 minutes by the NIOSH/MSHA (Federal non-fire service agencies) will last about 15 to 20 minutes depending on

                      • Physical condition

                      • Psychological stability or make-up

                      • Ability to control breathing

                      • Training and experience

                      • Work activity

                      • Other factors

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• Harness - a device to hold and carry the breathing apparatus assembly on the back

          • Backplate - holds the cylinder in place with a cylinder strap; equipped with

            adjustable band for 30- and 60-minute cylinders

          • Shoulder strap - straps to carry the assembly on the back

          • Chest strap - holds the shoulder straps in position

          • Waist strap - holds the harness on the back and to prevent the assembly from

            sliding

          • Approval label - NIOSH/MSHA

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• Low pressure warning device

          • Device to warn that your air supply is running low

          • Activates at approximately 25% of rated working pressure (3 to 5 minutes) of air

            left in the cylinder, depending on

                     • Physical condition

                     • Psychological stability or make-up

                     • Ability to control breathing

                     • Training and experience

                     • Work activity

                     • Other factors

          • Location and type of device

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• High pressure hose

         • Carries air, at cylinder pressure, from cylinder to first and second stage

            regulators

         • Connector from high pressure hose

                     • Should be finger tight. If the connector still leaks, snug up with hand. If it still

                        leaks, check "O" ring. Never over tighten. It will damage "O" ring

                     • Keep spare "O" rings with apparatus, replace as necessary

                     • Never use wrench, or full hand power on connector

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• Regulator assembly - a device which reduces the high pressure air from the cylinder to a lower pressure

             • First stage mounted on side of backpack

             • Gauge - tells how much air is remaining in the cylinder

                     • Connected to high pressure hose and fastened to left shoulder strap

                     • Shows pressure reading whenever pressure on system

                     • Have student compare cylinder and regulator gauge, go by lowest pressure