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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


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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 Safe Register Technical Bulletin 001
  • The Gas Industry Unsafe Situations Procedure
    • the incident scene should not be disturbed other than to make safe
    • once safe no work should be carried out without first leasing with the HSE representative
  • The Gas Safety Regulations:
    • Regulation 34 Use of Appliances
    • Regulation 26 Gas Appliances
  • The Gas safety (Management) Regulations
  • The Gas Safety (Rights of Entry) Regulations
    • gives the right to enter a property for all public gas transporters' officials to make the situation safe
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Reportable Cases

  • Situations that should be reported to RIDDOR (Reporting of Injuries, Diseases and Dangerous Occurrences Regulations):
    • gas escape outside the tolerance of a tightness test
    • uncapped open ended pipes connected to the gas supply
    • appliances that are spilling products of combustion
    • defective flues or chimneys that are not clearing flue gases
    • appliances that should have a flue, but have not
    • appliances with inadequate permanent ventilation
    • appliances that are not suitable for use with the gas supplied
    • appliances with inoperative safety devices
    • appliances with connections made of unsatisfactory materials (garden hose)
    • all illegally installed open flued appliances in bathrooms and shower rooms after 24th November 1984
    • exposure to carbon monoxide or to unburned gas
    • fire
    • explosion
  • 'Report of Dangerous Gas Fittings' form (2508/G2) should be send to the HSE office within 14 days of finding the dangerous gas fittings
    Report of Dangerous Gas Fittings Report of Flammable Gas Incidents
  • 'Report of Flammable Gas Incidents' form (F2508/G1)
    Report of Flammable Gas Incidents Report_of_Flammable_Gas_Incidents_page2
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