Pipework
Low Pressure Gas Pipe
Low pressure gas supply pipe (below 75 mbar)
BS 1553-1
Medium Pressure Gas Pipe
Medium pressure gas pipe (75 mbar to 2 bar)
BS 1553-1
Concealed Gas Pipe
Gas pipe run concealed within the building structure
BS 1553-1
Tee Piece
Gas pipe tee junction
BS 1553-1
Test Point
Gas pressure test point nipple
BS 6891 / Gas Safe
Meters & Controls
Gas Meter
Gas supply meter position
BS 1553-1
Gas Isolation Valve (Main)
Main gas isolation valve at meter
BS 1553-1 / Gas Safe
Isolating Valve
Manual gas isolation valve for individual appliance
BS 1553-1
Pressure Regulator
Gas pressure regulator / governor
BS 1553-1
Appliances
Gas Boiler
Wall-hung or floor-standing gas boiler
BS 1553-1 / Gas Safe
Gas Fire / Heater
Gas-fired room heater or decorative fire
BS 1553-1
Gas Hob / Cooktop
Gas cooking hob / cooktop
BS 1553-1
Gas Oven
Gas-fired oven / range cooker
BS 1553-1
Ventilation & Flues
Flue Terminal
Flue / chimney terminal point (balanced or open flue)
BS 5440 / Gas Safe
Air Vent
Fixed ventilation opening for combustion air supply
BS 5440-2 / Gas Safe
All 15 at a glance
| Symbol | What it means | Group | Standard |
|---|---|---|---|
| Low Pressure Gas Pipe | Low pressure gas supply pipe (below 75 mbar) | Pipework | BS 1553-1 |
| Medium Pressure Gas Pipe | Medium pressure gas pipe (75 mbar to 2 bar) | Pipework | BS 1553-1 |
| Concealed Gas Pipe | Gas pipe run concealed within the building structure | Pipework | BS 1553-1 |
| Tee Piece | Gas pipe tee junction | Pipework | BS 1553-1 |
| Test Point | Gas pressure test point nipple | Pipework | BS 6891 / Gas Safe |
| Gas Meter | Gas supply meter position | Meters & Controls | BS 1553-1 |
| Gas Isolation Valve (Main) | Main gas isolation valve at meter | Meters & Controls | BS 1553-1 / Gas Safe |
| Isolating Valve | Manual gas isolation valve for individual appliance | Meters & Controls | BS 1553-1 |
| Pressure Regulator | Gas pressure regulator / governor | Meters & Controls | BS 1553-1 |
| Gas Boiler | Wall-hung or floor-standing gas boiler | Appliances | BS 1553-1 / Gas Safe |
| Gas Fire / Heater | Gas-fired room heater or decorative fire | Appliances | BS 1553-1 |
| Gas Hob / Cooktop | Gas cooking hob / cooktop | Appliances | BS 1553-1 |
| Gas Oven | Gas-fired oven / range cooker | Appliances | BS 1553-1 |
| Flue Terminal | Flue / chimney terminal point (balanced or open flue) | Ventilation & Flues | BS 5440 / Gas Safe |
| Air Vent | Fixed ventilation opening for combustion air supply | Ventilation & Flues | BS 5440-2 / Gas Safe |
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