Backflow preventers BA

Water is distributed throughout the ship and is not only consumed by the crew, but also by water fed systems. Every time the water is used, the risk of chemical/biological contamination of the complete system grows. KEMPER ´Protect´ backflow preventer BA safeguards drinking water against non-potable water, up to and including fluid category 4.

Kemper regulation valves, backflow preventers and venturi are basic safeguards for your water system. All Kemper valves are provided with all necessary permits. All components underlie the strictest requirements, which can only be guaranteed through the greatest possible quality assurance.

NIPH classifications

The “NIPH Water Report 120-Safe, Sufficient and Good Potable Water Offshore” refers to the EN 1717. It classifies five water categories which describe the quality of the water present in different types of outlets and connected systems:

  • Category 1 is water for human consumption directly from a potable water system. 
  • Category 2 is water suitable for human consumption, but it is treated. For example by heating or cooling (coffee maker, ice cube maker).

The higher the category, the higher the risks and the requested protection. The description of category 5 is a fluid, representing a health hazard to humans because of the presence of microbiological or viral pathogens of transmittable diseases (infection, mortal danger).


Kemper has valves and solutions for various categories. The most common protections are the EA and the BA-series. The EA (antipollution check valve) is allowed till category 2 and the BA (backflow preventer) till 4. EN 1717 has to be followed for correct installation. EA with valve and BA with cut-off valves and strainer.

Characteristics BA backflow preventers

  • All connections available
  • Shortest build in length
  • 4ms certified

Risk points

All outlets and systems in the potable water system need to be connected in a safe way to prevent pollution. The type of connection depends on the health risk category of the water inside the connected outlet or system. If the colour, taste, temperature or purity changes, the correct way of connection needs to be selected. Some examples are:

  • Dish washer
  • Washing machine
  • Potable water connection to oil separator
  • Waste water treatment
  • Window wash system
  • etc.

Shipbuilding engineers have a challenging task in keeping water safe for crews and passengers. Rely on us; we are happy to help you. 

  • Flyer Unmanned Platforms

    More information on automatic flushing and prevention of contamination on unmanned platforms (PDF - 2,4 MB)