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Gas Safety

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

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Gas Performance

Heat Input

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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

Heat Input for an Appliance (Imperial meters)

  1. Ensure that all other gas burning appliances are turned off
  2. Turn on the applinace to be rated to its maximum setting - allow to run for 10 minutes
  3. Time in seconds how long it takes for test dial to complete 1 revolution (1ft3)
  • ft3 x 0.028 = m3
  1. Appliance Input (kW) = (3600/t) x 0.028 x (CV/3.6)
    • t - time in seconds per 1 revolution
    • 0.028 - to convert ft3into m3
    • CV - calorific value of natural gas 38.6MJ/m3 (1040 BTUs)
    • 3.6 - converts Mj into kW
  2. Appliance Input (kW) = (3600/t) x 1040/3412
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Heat Input for an Appliance (Metric meters)

  1. Ensure that all other gas burning appliances are turned off
  2. Turn on the applinace to be rated to its maximum setting - allow to run for 10 minutes
  3. Take the first reading from the meter R1
  4. At exactly 2 minutes take the second reading R2
  • Appliance Input (kW) = Gas Rate ((R2-R1) x 30min) x CV(kW)
    • R1 - first reading of the meter
    • R2 - second reading after 2min
    • CV - calorific value 10.77 kW
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Working Pressure Test

Working pressure test
  • working pressure - 20 to 22mbar
  • test with 'U gauge' when one appliance is put on full burn
  • Standing pressure should be 21 to 25 mbar
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