Safe fuel tanks for buses

Rotational moulded fuel tanks with a typical volume of 250 up to 1000 litres for buses and coaches, must be compliant to UN regulation R34. This means that the tank must pass a series of safety tests performed by accredited certifying bodies, such as:

  • Hydraulic pressure test of 0,3 bar for 1 minute
  • A minimum of three impact tests with a weight of 15 kg and impact energy of 30Nm at -40 degrees Celsius
  • Mechanical strength by pressurizing the tank at 0,3 bar at a temperature of 53 degrees Celsius for five hours
  • Resistance to high temperature with a 50% filled tank at 95 degrees Celsius for 1 hour

After performing the tests the tank must show no leakage, cracks, or permanent deformation. All fuel tanks for buses and coaches of Rotovia pass these tests, also due to our extensive know how to design a safe fuel tank.

Fuel Tanks Buses 1
Buses Fuel Tanks

Rotomoulded tanks safer than steel tanks

In case of fire, you want all the passengers to leave the bus before the fuel tank explodes and spreads the fire. A diesel tank made of polyethylene is safer in fire than a steel tank. Since steel is a very heat conductive material, the diesel and vapours inside the tank will heat up fast in a fire. When the venting is blocked, this can lead to dangerous pressure build up and in the worst case to an explosion, spreading the fire.

A rotomoulded polyethylene fuel tank is much safer, since polyethylene is an insulation material keeping the diesel and vapours in the tank relatively cool in case of fire. Fire tests performed according ECE R34 annex 5 show amazing results regarding safety.

Suitable material for contact with diesel

The UN regulation R34 also requires strict tests for the materials in order to prove suitability for diesel fuel, such as the permeation test. The first step is pre storage with diesel at 40 degrees Celsius for a period of 4 weeks. After this pre storage the tank is emptied and refilled again, sealed, and stored for a period of 8 weeks at 40 degrees Celsius. Under these conditions only 20 grams of diesel per day may permeate. After this permeation test, the impact test and the mechanical strength test are repeated.

Our tanks pass these tests and show no influence of fuel to the tank material. Our long-term experience with the correct material choice and applying the correct process parameters are important to fulfil all these legal demands. This makes our rotomoulded fuel tanks very suitable for buses.

Fuel Tanks Buses 3


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