Starting Air Receiver

The starting air receiver is a pressure vessel storing compressed air at approximately 30 bar, used to provide the pneumatic energy needed to start the main engine and diesel generator sets by forcing compressed air into each cylinder in turn in the firing order. SOLAS Chapter II-1/37 requires that main engines be capable of starting from cold in a specific number of consecutive starts without recharging, which determines the minimum receiver capacity relative to engine displacement. Two receivers are normally fitted for redundancy, each capable of providing sufficient air for multiple start attempts. The receivers are charged by dedicated starting air compressors and are protected by safety valves, pressure gauges, and drain valves for removing condensate. Condensate must be drained regularly to prevent water carryover into the air start system, which can cause a water hammer event in the engine cylinders or corrode the starting air valve seats. Class rules and SOLAS require safety valves to be tested and receivers to be inspected internally at specified intervals, normally during drydock. Engineers record receiver pressures in the engine room log at each watch and ensure automatic compressor cut-in and cut-out pressures are correctly set.