Short answer
A gas booster is a fan or compressor that raises gas pressure downstream of the meter when the supply cannot deliver enough pressure for the installation — for example large burners needing higher inlet pressure, or long runs on a low pressure supply. Because it draws on the public network, it must have a low inlet pressure cut-off and the gas transporter must be notified before installation.
Typical arrangement
Inlet isolation valve, flexible connectors, booster, non-return valve, outlet isolation, and often a bypass with its own valve and non-return. Controls include an inlet low-pressure switch that stops the booster if network pressure falls, an outlet pressure switch, and interlocks with the burners it serves.
Why the low-pressure cut-off matters
Without it, a booster could pull the network down, starving neighbouring consumers or drawing air in through leaks. The cut-off setting is agreed with the gas transporter and tested at every service.
Alternatives
Before fitting a booster, check whether upsizing pipework, upgrading the meter, or requesting a higher pressure supply solves the problem more simply. Boosters add maintenance, noise and a point of failure.
Servicing
Check inlet and outlet pressures, cut-off switch operation, non-return valve function, vibration and bearing condition, and the electrical controls and interlocks.
Figures are typical for UK natural gas. The current edition of the relevant IGEM standard and the manufacturer's instructions always take precedence on site.
Need this done on site?
Need a commercial gas engineer in London?
Gas Safe registered commercial engineers, 24 hours a day. Call now or book online and we'll confirm a time.