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Gas Safety

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

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Commissioning

Purging

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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

Purging Volume

  • All air and gas mixtures have to be removed before commissioning an appliance
  • Inform the customer and put up notices if necessary
  • Open the ECV and note the meter
  • The following chart shows how much gas should be purged:
    Meter Pipework Purge Volumes

    E6, G4, U6
    Pipework ≤28mm

    0.01m3
    U6, G4
    35mm ≤ pipework > 28mm
    0.01m3 + 1.5 x Vp*
    E6
    35mm ≤ pipework > 28
    0.0036m3 + 1.5 x Vp*
    G10, U16
    pipework ≤ 32mm
    0.03m3 + 1.5 x Vp*
    *Vp - volume of pipes and fittings
  • If the volume is 0.02m3 or less the gas can be purged into the building
    • if more than 0.02m3 a temporary burner must be installed
  • Open the appliance furthest from the meter
  • Establish a stable flame at each appliance
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When to carry out?

  • New installation
  • Alteration to, replacement of, or re-use exciting installations
  • New extensions to existing pipework
  • Where there has been a complete loss of pressure for any reason
  • Where there is the possibility of air being present in an installation
  • Where an installation is to be taken out of service temporary or permanently
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