Stability calculations

Previously stability was sometimes talked about in relation to inland shipping, but that was usually the case because a ship had capsized, for example. When at the start of the Eighties containers started to be transported over inland waterways, the word STABILITY suddenly took on an altogether different meaning in inland shipping.

People became more prudent and began to be aware that when the centre of gravity of the cargo was higher than the original ship’s centre of gravity, then sometimes problems could occur when navigating out of a port, or in high winds and putting the rudder over etc. Also the loose liquid in a tank or water in the hold, suddenly appeared important. Previously this was also hazardous, of course, but it just wasn’t usually seen as such.

In the Eighties Van Pelt & Co had a direct impact on the new transport design and at that time completed many container stability calculations. And this is something that we are still doing today. This has almost become everyday work as a result of the many newly constructed ships over the past number of years.

When the ships have a ship’s length longer than 110 meters, then in each case damage stability calculations need to be completed and so-called divisibility calculations. Problem? Not if you approach Van Pelt & Co and ask them to perform such calculations.

We have a number of modules in the PIAS program, that enable us to carry out all sorts of different stability calculations for you. Both for dry cargo shipping and tanker shipping. Both intact and damage stability calculations are “bread and butter” for us.

If you are an insurer and one of your insured parties has incurred serious damage and you want to know whether this was to do with an incorrect load, as a result of which stability was jeopardised, then you have come to the right place to have this independently calculated by us. We are also adept at giving advice about stability.

Should you unexpectedly need to load a heavy structural component or, for example, a large generator, about which you only know its dimensions and weight, then you can approach us to calculate whether the base structure is sufficiently strong for this purpose and it is also possible to get us to determine whether stability may possibly be jeopardised.

In short, be careful about stability, because “it if does go, then it will go quickly”.
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Propeller shafts
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.