SCBA Breathing Apparatus Components

SCBA Components and Inspections

• The type of BA used is a self-contained open circuit, positive pressure breathing apparatus.
• The 4 components of the breathing apparatus are:
• Mask
• Cylinder
• Back pack (Frame)
• Regulator

Visual Inspections: Mask

• Inspect rubber for a tight seal and secure fit to the lens ring
• Inspect head harness
• Inspect lens for scratches, deformation, and color change (HUD)
• Check Light ports are undamaged
• Ensure Nose cup is in correct disposition

Visual Inspections: Cylinder & Valve Assembly

• Inspect rubber boot is present and dove tail is not damaged or cracked
• Inspect gauge face and needle
• Inspect cylinder valve
• Ensure Pressure relief valve is secure
• Inspect cylinder body for cracks, damage, faceplate, whims label, or discoloration
• Hydrostatic test date should be within 5 years
• Pressure Reducer with low pressure warning device should be present
• Inspect pressure relief valve (Label is not damaged)
• Inspect hose and connections, ensuring O-ring is present on High-Pressure connection

Carrier and Harness Assembly

• Ensure bell is properly aligned and screws are tight
• Operate latch on cylinder band to ensure it opens and closes properly and holds the cylinder securely
• Inspect backplate & power module/pressure reducer are secured
• Inspect all harness components (straps, lumbar pad, hoses, buckles, regulator keeper & chest strap)
• Ensure Speaker Module is attached and secure to shoulder strap
• Inspect TIC Sensor for cleanliness and freedom from debris
• Control Module should be undamaged

Regulator (Demand Valve)

• Ensure it is free of moisture and debris
• Seals (Orange & grey) should be present and functional
• Bypass function should be operational

Power Module

• Inspect for damage
• Inspect LED's on all sides
• Ensure black O-ring is present on battery
• Functional test: insert battery, wait for unit to power on, then turn off

Functional Tests

• Check cylinder pressure is full (Above 4000PSI)
• Open Cylinder valve and listen for alarm on up-swing
• Allow gauges to equalize (within 5%)
• Close tank valve and perform 10-second bleed down (no more than 100psi)
• Open bypass and ensure low air alarm engages at 3537% of rated bottle capacity (1575PSI)
• Alarm functions audibly until 200 PSI or less
• Allow control module to remain motionless for approximately 18-20 seconds and verify PASS pre-alarm functions
• Verify buddy lights are flashing red
• Verify red LED is flashing in the HUD
• Verify White LED illuminates
• Verify shaking control module does not silence PASS
• Check manual activation of the PASS alarm by pressing and holding the alarm button on the front of the control module until the alarm activates