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Gas Safety

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

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Gas Pipework

Pipe Protection

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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

Support and Insulation

  • 25mm - min extension of any protection applied beyond the surface of corrosive material
  • 40mm - min depth below concrete slabs with pedastrian traffic

Maximum Interval Between Pipe Supports
Material Size mm Vertical m Horizontal m
Mild steel up to DN 15 2.5 2.0
DN 20 3.0 2.5
DN 25 3.0 2.5
Copper tube up to 15 2.0 1.5
22 2.5 2.0
28 2.5 2.0
Corrugated stainless steel DN 10, 12, 15, 22, 28 0.6 0.5
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