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Gas Safety

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Unsafe Situations

Gas Leak

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Safety Devices and Controls

Air/Gas ratio valves

Appliances Controls

Flame Supervision Devices FSD

Gas Controls

Gas Meter Controls

Safety Cut-off Devices

Spare Part Identification


Open-vented System


Gas Appliances

Ventilation Sizing

Unsafe Situations

Dealing with Unsafe Situations

Emergency Notices and Warning Labels

Gas Leak




Tightness Test

Gas Performance

Gas Rate

Heat Input

Gas Supply

Gas Meters

Gas Pipework

Gas Fittings and Pipes

Gas Supply


New Installation

Pipe Protection

Pipework Sizing

Chimney and Flue


Flue Construction

Flue Inspection and Testing

Flue Terminals

Flue Types


Carbon Monoxide Poisoning

Combustion Process

Natural Gas

Portable Combustion Gas Flue Analysers


Components and Safety Devices

Gas Leak Detectors

  • With Portable Electronic Gas Detector check at:
    • control taps
    • appliance connection points
    • fittings and unprotected pipework in contact with corrosive material
  • Wall-mounted Gas Detector
    • Positioning for Natural Gas
      Gas Detector Positioning for Natural Gas
      • MAX 300mm below the ceiling
      • MAX 5m away from an appliance
    • Positioning for LPG
      Gas Detector Positioning for LPG
      • MAX 300mm above the floor level
      • MAX 4m away from an appliance

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CO Detectors

  • MIN 1.5m above the floor level
  • 1.8 to 3m away from an appliance
  • Electrical CO Alarm (carbon monoxide detector; ~£17)
    Electrical CO Alarm
    • Activation Time:
      • 50ppm - 60-90 min
      • 100ppm - 10-40 min
      • 300ppm - 3 min
CO Indicator Card

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Leak-detection Fluid

  • use method of elimination
  • test the pipework in smaller sections

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