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Cleaning Black Water Tanks with Nozzles

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INDUSTRY
Shipbuilding industry
APPLICATION
Washing
INDUSTRY

Shipbuilding industry

APPLICATION

Washing

PROBLEM

Identifying an effective, repeatable, and verifiable cleaning method

SOLUTION

Manifold system, full cone nozzles, and tank washing devices

Sewage water treatment in the shipbuilding industry

PNR Italia designs a new solution for cleaning sewage water tanks on yachts.

The industry

The Italian law provides that all pleasure boats built since 2008 and equipped with toilets must have sewage water tanks or a wastewater treatment system.

When sailing offshore, boaters must dispose of chemically treated sewage water strictly beyond 3 miles from the coast, while untreated sewage water is beyond 15 miles.
The law states that fixed or mobile solutions must be installed within all ports to offer all ships, including fishing boats and pleasure boats, to unload the waste produced, whether it is wastewater, bilge water, oils, or solid waste.

The ship’s systems for sewage water treatment can be of various types and sized according to the ship’s dimensions, but in general, they all use tanks and filter membranes.
A fundamental operation is the maintenance of the systems and the cleaning of the tanks.

The problem

The customer who turned to PNR Italia manufactures sewage water treatment systems for small or medium-sized yachts.

The need was to identify an effective, repeatable, and verifiable method of cleaning the tanks of the sewage treatment system. Before our intervention, the cleaning was carried out with manual cleaning systems and sprinkler nozzles already supplied with the yachts.

The ship’s systems for sewage water treatment can be of various types and sized according to the ship’s dimensions, but in general, they all use tanks and filter membranes.

The solution

The PNR Italia technical office has designed a manifold system with nozzles and tank washing devices.

The H-shaped manifold houses 4 UBC tank washing heads at the ends and 4 E spiral full cone nozzles on the central section.

The purpose of the spiral nozzles is to clean the most difficult spot to reach.

Studio di copertura

SECTION OF THE SEWAGE WATER TREATMENT SYSTEM TANK
MANIFOLD WITH NOZZLES AND TANK WASHING DEVICES

Studio di copertura

SECTION AA’
PLAN OF THE TANK OF THE SEWAGE WATER TREATMENT SYSTEM

Advantages

The system developed by PNR Italia allows for optimal cleaning of the sewage treatment systems’ tanks.
The process is automated, verifiable, repeatable and does not require manual intervention.

Prodotto E

E

FULL CONE NOZZLES

The E-type full cone nozzle works on the impact principle. It deflects a water stream that impacts onto a spiral-profiled surface, providing the desired spray angle. Their special design makes them virtually clog-free and produces a wider spray coverage than other nozzles for a given flow and pressure.

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