Stability tests

Many of you will perhaps be wondering “what are stability tests, are they carried out on a slipway and what is the purpose of them”.

We can unravel the mystery for you and can even carry them out for you.

When a stability calculation needs to be carried out, a ship’s or floating object’s centre of gravity can be determined in two ways. On the one hand, by calculating all, and that means ALL weights on board the ship or floating object in terms of length, width and height. It is an extremely painstaking, extensive and thus expensive job to determine this.

A stability test is a good alternative.

By moving weights on board the ship or floating object and based on the displacement of one or two pendulums using a few calculations it is possible to determine what the relevant ship’s or floating object’s centre of gravity is.

Using the result of the stability test, extensive stability calculations can then be performed.

Often a stability test involving additional stability calculations is stipulated by the ’Inspectie Leefomgeving en Transport’ (ILT). On the other hand, it can sometimes be very important to understand what the ship’s centre of gravity is, in order to easily determine the stability of your ship for different types of cargo in the future.

The following applies: “prevention is better than cure”.
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With renewal of the certificate after 01 January 2015, all the shaft ceilingducts of rudder stocks and of (propeller)shafts need to be conducted, so, that no water polluted lubricants can come out. This means that, also for existing ships, rudder stocks and propeller shafts should provide an outer seal. We advise you, when a rudder stock or propeller shaft must be disassembled for example (damage)repair, to use the opportunity to place an outer seal, including any modification of the rudder stock or propeller shaft.