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Gas Safety

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

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Chimney and Flue

Flue Inspection and Testing

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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

Pipework

Open-vented System

Ventilation

Gas Appliances

Ventilation Sizing

Unsafe Situations

Dealing with Unsafe Situations

Emergency Notices and Warning Labels

Gas Leak

Regulations

Commissioning

Purging

Tightness Test

Gas Performance

Gas Rate

Heat Input

Gas Supply

Gas Meters

Gas Pipework

Gas Fittings and Pipes

Gas Supply

Materials

New Installation

Pipe Protection

Pipework Sizing

Chimney and Flue

Chimneys

Flue Construction

Flue Inspection and Testing

Flue Terminals

Flue Types

Combustion

Carbon Monoxide Poisoning

Combustion Process

Natural Gas

Portable Combustion Gas Flue Analysers

Boilers

Components and Safety Devices

Flue Inspection and Testing

  • clips are not more than 1.8m apart
  • bends are not more than 45° (30° - for pre-cast flue)
  • Flue-flow testing using a Smoke Pellet (5m3 of smoke within 30 sec)
  • Spillage testing using Smoke Matches
    Characteristic Natural gas Propane Butane
    Specific gravity 0.6 1.5 2.0
    Calorific value 39MJ/m3 93MJ/m3 122MJ/m3
    Stoichiometric air requirements 10:1 24:1 30:1
    Supply pressure 21mbar 37mbar 28mbar
    Flammability limits 5-15% 2-10% 2-9%
    Flame speed 0.36m/sec 0.46m/sec 0.45m/sec
    Ignition temperature 704°C 530°C 408°C
    Flame temperature 1930°C 1980°C 1996°C
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