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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

Pipework Sizing

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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

Volume of a Gas Pipework

  • If the volume of gas in the system is 0.035m3 or less - classified as domestic
  • Installation Volume (IV) = Pipework Volume (Vp) + Fittings Volume (Vf) + Meter Volume (Vm)
    • Pipework Volume (Vp)
      Volume of Pipework in m3
      Tubing Sizes Volume of 1m Tube
      Steel or Stainless Steel
      15mm (½") 0.00024
      20mm (¾") 0.00046
      25mm (1") 0.00064
      32mm (1¼") 0.00110
      Copper Tube
      15mm 0.00014
      22mm 0.00032
      28mm 0.00054
      35mm 0.00084
      PE Pipe
      20mm 0.00019
      25mm 0.00033
      32mm 0.00053
    • Fittings Volume (Vf) = Vp ÷ 10
    • Meter Volume (Vm)
      Volume of Gas in Meter in m3
      Meter Type m3
      E6 0.0024
      G4/U6 0.008
      G10/U16 0.025

gas pipe sizing example



**Discharge of Gas in m3/hour
Size of tube mm *Total Length of Pipe m
3 6 9 12 15 20 25 30
Discharge in cubic metres per hour (m3/hour)
10 0.86 0.57 0.50 0.37 0.30 0.22 0.18 0.15
12 1.5 1.0 0.85 0.82 0.69 0.52 0.41 0.34
15 2.9 1.9 1.5 1.3 1.1 0.95 0.92 0.88
22 8.7 5.8 4.6 3.9 3.4 2.9 2.5 2.3
28 18.0 12.0 9.4 8.0 7.0 5.9 5.2 4.7
*Add 0.5m for each elbow
*Add 0.3m for each bend
**only a 1.0 mbar drop between the ends is allowed



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