Shipbuilding industry is awesome. Marcin Ryngwelski on designing & installing sanitary cabins onboard

Function and configuration

A sanitary cabin is a self-contained unit assigned to a crew or passenger cabin, typically including a toilet and shower. Its size and level of outfitting depend on the vessel’s function and the owner’s specification.

- A passenger ship will have a different standard than a naval vessel. Requirements for number of crew, privacy, durability and ease of maintenance define the final configuration, says Ryngwelski.

Placement defined at the design stage

The arrangement of crew and passenger accommodations, including sanitary cabins, is determined during the technical design phase. This planning must meet regulatory requirements, including corridor width, escape routes and compartment division.

- The shipyard and its design office plan the layout according to capacity requirements provided by the client. The design must ensure compliance with class rules and naval standards. This is not something that can be corrected late in the process, Ryngwelski notes.

Delivery timing is critical

Cabins or their foundations must arrive while the hull or superstructure is still open and accessible.

- The hull must have technological openings that allow these units to be moved inside. If the cabin is delivered too late, and heavy doors or portholes are already installed, the shipyard faces unnecessary rework, explains Ryngwelski.

In cases where the supplier delays delivery, alternative transport paths may need to be created. This can require removal of elements already fitted, extending the schedule and increasing cost.

Assembly process

One common installation method includes:

• marking the position on the deck,
• attaching the cabin base to the deck structure,
• applying the leveling layer or using the factory-finished flooring,
• assembling the cabin walls and internal partitions,
• installing sanitary equipment,
• connecting water supply, drainage and electrical power,
• fitting the cabin door.

- Tolerance and alignment matter—cabin floors must drain correctly, walls must align with bulkheads, and pipe routing must not introduce stress into the system, Ryngwelski emphasizes.

Large passenger ship approach

On large ferries and passenger vessels, where cabin counts may exceed one thousand, the process is different. Fully outfitted cabin modules are produced off-site and installed as entire units.

- They are moved into the vessel in a single operation, once the structure reaches the correct stage. This is a highly coordinated logistics procedure.

First users

During sea acceptance trials, sanitary cabins are first used by:

• shipyard personnel,
• representatives of the owner or navy,
• classification society surveyors,
• regional naval inspectors (for military vessels).

SAT confirms not only the performance of ship systems but also the functionality and durability of outfitting components.

Sanitary cabins appear to be simple interior spaces, yet their integration is tightly linked to design decisions, supply-chain reliability and outfitting sequencing. They represent a precise interface between structural work, piping systems and accommodation standards.