Spare machine needs backup
Big blowers (190 m³/min at 500 mbar) produce the process air for a desulphurization plant in an oil refinery. When one blower broke down immediately the spare machine was started. As not to jeopardise the refinery process an autonomous backup was needed for the spare machine.
More machines in parallel service.
To cope with the big capacity ARD delivered in the middle of the night 4 blower units. The connection to the diesel generator (1000 kVA) and the air piping took place next so before sunrise the backup machines were stand-by.
With T-pieces the machines are connected to each other. Check valves in each machine prevent the air flowing away to another machine.