For installation underground, space for daily inspection and maintenance is provided around the gas storage unit. Air intake and exhaust ducts Compressor unit cooling air intake and exhaust ducts are positioned vertically from the dispenser island, the intake below the canopy and the exhaust above it. The intake duct is provided with a fan for constant ventilation. The body is reinforced concrete structure. The top of the underground chamber is strengthened of facilitate large vehicles such as a transit bus passing over it.
Space is provided within the underground chamber for normal maintenance to be carried out.
When the compressor is stooped, its fan also stops. The constant ventilation is provided by a ventilating fan installed in the upper part of the intake duct which switches on automatically. To cope with power failure, an emergency back-up power source is provided which is set up to switch on automatically to operate the ventilation fan. If a gas leak occurs in the underground chamber, this will be detected, a warning will be issued and the equipment will be shut down automatically. Heat detector Is a fire occurs in the compressor compartment, this will be detected by the heat detector and a warning will be issued.