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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 Terminals

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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

Terminal Types

  • Unsuitable flue terminals
    Unsuitable flue terminals
  • Suitable flue terminals
    Suitable flue terminals
    • Details are in BS 5440-Part1(2000)
    • Designed to prevent down draught
    • Positioned so products of combustion cannot enter the house
    • GLC and GC1 terminals are approved types

Ridge Terminal Locations
Ridge terminal locations

  • MIN 300mm between each other
  • MIN 1.5m away from an adjacent structure

 

Terminal on a Pitched Roof
Plumber in Hammermsith

  • MIN 1.5m away from the roof or MIN 600mm above the ridge
  • Next to a tall structure
    Flue termination Next to a tall structure
    • MIN 600mm above the imaginary roof line AND MIN 2.3m away from tall structure OR
    • MIN 10m away from a tall structure
  • with a structure:
    • more than 600mm away or
    • not less than 600mm above the structure

 

Flue Termination Near to Openings on a Wall
Flue Termination Near to Openings on a Wall

  • MIN 150mm - for fanned draught flues
  • MIN 300m - for natural draught flues

 

Termination Below Temperature Sensitive Components
flue Termination Below Temperature Sensitive Components

  • MIN 300mm below plastic gutters (75mm for fanned draught)
  • MIN 300mm below eaves (200mm for fanned draught)
 

Flat Roof (0-20° rise) Termination

  • flat roof with no parapet
    flat roof with no parapet flue termination
    • on side - MIN 60omm above the roof
    • on top - MIN 250mm above the roof
  • flat roof with a structure
    flat roof with a structure flue termination
    • MIN 1.5m away from structure OR
    • MIN 600mm above the structure

Flue Termination Near to Openings on a Roof
Flue termination near to openings on a roof

  • MIN 2m below the opening
  • MIN 600mm beside or above the opening

 

Flue Termination Boundaries

  • facing boundary - MIN 600mm
    Flue Termination facing boundary
  • parallel to boundary - MIN 300mm
    Flue Termination parallel to boundary
  • at an angle to boundary - MIN 600mm on front and 300mm on side
    Flue Termination at an angle to boundary
  • opening in adjacent building - MIN 2m
    Flue Termination opening in adjacent building
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Flue Termination Clearance Distances

separation_distance
  • A terminal less than 2m high from the ground level must have a protective guard
  • In the basement area the terminal must be no more than 1m below the ground level

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Clay Blocks

Clay Blocks
  • BS 1289
  • clay is a slow conductor of heat
  • resistant to rust and corrosion
  • smooth surface inside the clay flue liner resists creosote build-up caused by low-burning fires
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