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Gas Safety

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

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Gas Supply

Gas Meters

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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


  • Regulation 9 of the Gas Safety (Installation and Use) Regulations
  • BS6400: Part 1 - Specification for installation of Domestic sized gas meters - maximum rated capacity not exceeding 6m3/h
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Meter Types

Gas Meters
  • U6 gas meter
  • G4 gas meter
  • E6 gas meter
    • Electronic token meter
  • R5 gas meter
  • U16 gas meter
  • E10 gas meter
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Meter Emergency Control Valve ECV

Gas Safety Devices and Controls

  • If ECV is more than 2m away from the meter - label at the meter should indicate the position of ECV
  • Additional Emergency Control Valve AECV
    • A pressure nipple should be within 300mm of each AECV
External Installation
  • Built-in Meter Box
    • Fitted on the outside wall of the dwelling
    • Fitted on the adjacent wall not more than 2m from the fron wall
    • The base of the box should be between 0.5-1m above Damp Proof Course DPC
  • Surface Mounted Meter Box
    • Generally used for new meter installations
  • Semi-concealed Meter Box
Internal Installation
  • Meters in Attached Garages
    • House entry tee - situated at the point of entry
  • Meter within Dwellins
    • House entry tee will be only on propperties less than 20 years old
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Gas Meter Installation

Gas Meters Installation
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Gas Meter Regulator

Natural Gas Meter Regulator
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