Shipbuilding industry is awesome. Marcin Ryngwelski on compressed air and starting the main engine

Why compressed air is critical

Most people associate an air compressor with a small device used to inflate tires. On board a vessel, the scale and purpose are entirely different.

- The main engine of a ship is not started like a car engine. It does not have a standard ignition system. The start-up process is controlled and relies directly on compressed air. Without this system, the vessel simply cannot get underway, says Ryngwelski.

Compressed air is used for:

• starting the main engine,
• control and actuation of engine systems,
• operating critical safety and control valves,
• handling specific onboard systems (including launch systems on naval platforms),
• powering pneumatic tools and maintenance equipment,
• cleaning operations such as cooler flushing.

System components

In technical terms, the compressed air installation consists of:

• compressors that generate air at the required pressure,
• steel air receivers for storage,
• pipelines distributing air throughout the vessel,
• valves and control elements ensuring safe operation.

- It appears simple as a list of equipment, but in practice the routing, accessibility, structural interface and service conditions require precise planning. This begins at the design stage, notes Ryngwelski.

Design and integration in the shipyard

The choice of propulsion and auxiliary systems determines the dimensions and capacity of the compressed air installation. The shipyard and its design office must plan:

• the placement of compressors and air receivers,
• foundations and structural supports,
• pipeline routing with collision-free access,
• space for maintenance and inspection.

- If equipment is delivered too late, the hull structure may already be closed. This can force additional access openings or removal of installed outfitting. Proper logistics timing is essential, Ryngwelski emphasizes.

Classification requirements

Classification societies impose minimum air storage capacity for operational safety.

- The air stored in the start air receivers must allow at least six consecutive starting attempts of the main engine. This is a mandatory requirement that ensures the vessel can be safely restarted, explains Ryngwelski.

The compressed air system is not merely auxiliary equipment. It is part of the essential operational infrastructure of the vessel. Its reliability depends on correct system design, careful installation and coordinated delivery scheduling.