Starting Air Receiver & Compressor Tool Main Engine Starts, Bottle Volume & Recharge Time

Starting Air • 12C / 6C Class Screen • Receiver Volume • Pressure Decay • Compressor FAD • One-Hour Recharge • Low-Pressure Alarm • N-1 Recovery

Starting Air Receiver & Compressor Tool Main Engine Starts, Bottle Volume & Recharge Time

Size and screen a marine starting-air system from the engine-start requirement through receiver storage and compressor recovery. Simple mode answers how many starts the installed bottles support, the minimum receiver volume, and recharge time. Advanced adds multiple receivers, connected pneumatic consumers, compressor redundancy, independently driven capacity, one-bottle isolation, low-pressure alarm reserve and live start-by-start pressure and recharge curves.

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Need individual bottles, compressor redundancy, other air users or alarm reserve? Click Advanced above.Simple uses free-air-equivalent engine start consumption and an isothermal ideal-gas storage screen. Class/flag/OEM-approved values should replace the sample inputs.

EnduranceStarts before Pmin

SizingMinimum bottle volume

RecoveryOperational & full recharge

Engine Starting Requirement

Propulsion starting arrangement

Shafting arrangement factor C

Custom required starts

Free-air use per startm³ free air per start at atmospheric/reference condition.

Other connected-air reservem³ free air reserved for other users.

Receivers & Compressors

Number of starting-air receivers

Total installed receiver volumem³ geometric volume.

Maximum receiver pressurebar(g).

Minimum engine starting pressurebar(g), OEM/approved minimum.

Number of starting-air compressors

Combined compressor FADm³/h free-air delivery.

Starting Requirement & Thermodynamic Basis

Propulsion starting arrangement

Shafting arrangement factor C

Electric-propulsion engine count kFor Z = 6 + 3(k−1), k capped at 3.

Custom required starts

Engine free-air use per startm³ free air/start, preferably OEM or measured.

Receiver sizing margin% added to required free-air quantity.

Maximum receiver pressurebar(g).

Minimum starting pressurebar(g).

Low starting-air alarm pressurebar(g).

Minimum starts desired after alarm

Atmospheric reference pressurebar absolute.

Free-air reference temperature°C.

Receiver air temperature°C used in ideal-gas storage screen.

Starting-Air Receiver Register

Current class practice commonly requires at least two starting-air receivers of approximately equal capacity. The total active volume is used for the start-endurance calculation; an automatic one-largest-bottle-out screen is shown separately.

Use	Receiver volume m³	Status

Other Pneumatic Consumers

Connected auxiliary starting, control, whistle or essential pneumatic demand should not reduce the required engine-start reserve. Enter one-time reserve quantities and/or continuous free-air demand during compressor recovery.

Use	Consumer type	Reserve free air m³	Continuous demand m³/h

Starting-Air Compressor Register

FAD is free-air delivery at the compressor reference/inlet condition. The class-rule screen checks total one-hour recovery, number of compressors, and independently driven capacity.

Use	FAD m³/h	Drive	Available now?

Black-Start / Emergency Compressor

Main compressor prime movers use starting air?

Independent emergency compressor installed?

Starting-Air System Checks

Engine start-air consumption verifiedOEM data or onboard measured drawdown supports the entered free-air/start value. Minimum starting pressure verifiedEntered Pmin reflects the engine maker / approved starting limit. Receivers isolated and drained as requiredNon-return, drain, relief and switching arrangements are maintained. Other connected consumers accounted forEssential pneumatic loads do not erode engine-start reserve. Compressor FAD verifiedEntered free-air delivery is from maker data or onboard recovery test. Independent compressor capacity verifiedDrive independence and electrical/mechanical availability are confirmed. Low-pressure alarm testedAlarm setting leaves sufficient pressure for further starting operations. Backfire / manifold protection reviewedNon-return, flame-arrester/rupture-disc and drainage arrangements match approved design.

Rule / engineering limitation: the 12C/6C and one-hour compressor screens implemented here are a current classification-rule basis for conventional reciprocating propulsion arrangements, not a substitute for the vessel’s actual class, flag and engine-maker requirements. Unusual propulsion/shafting arrangements, gas turbines, ice-class additions, control-air integration and manufacturer-specific start sequences can require different capacities.

Rule basis: current ClassNK machinery rules require at least two starting-air reservoirs for compressed-air-started main propulsion engines, with total capacity for the prescribed consecutive starts without replenishment. For conventional reciprocating propulsion, the rule screen is Z = 12C for direct-reversing engines and half that value for non-reversing engines using separate reversing gear/CPP. Two or more starting-air compressors are generally required, at least one independently driven, independent-drive capacity is to be at least 50% of the required total compressor capacity, and total compressor capacity is to restore the receiver system from atmospheric pressure to the pressure required for the prescribed starts within one hour.

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