A better way calculates stability of hydraulic trailers and improve safety

Mammoet’s verified approach improves 40-year old industry standard. The company recently announced the introduction of Dynamic Stability, a better method for calculating the dynamic stability of hydraulic trailers. This method provides clients with a detailed assessment of the safety level of their project before it commences.

When moving a load using hydraulic trailers, you have to ensure two things: that the load is stable and does not tip over, and that the trailers carrying the load are strong enough to carry the load.

The assessment deals with more relevant parameters than customary in the industry up till now. For example, it allows executing safer hydraulic transport projects. In some cases, Dynamic Stability will also contribute towards more efficient ways of using hydraulic trailers.

Dynamic Stability was developed in-house and has been verified and approved by classification society DNV. Mammoet will be using Dynamic Stability for all hydraulic transport projects from now on.

Static rules of thumb
“When you move a load using hydraulic trailers, you have to ensure two things: that the load is stable and does not tip over, and that the trailers carrying the load are strong enough to carry the load,” explains Ludo Mous, Director Operations at Mammoet Europe. “Up until now, Mammoet has always followed the industry standard for ensuring enough strength and stability.” This standard is based on two rules of thumb: the 7- degree rule and the 2-degree rule.

These rules stipulate that the center of gravity of the load must stay within a seven-degree tipping limit and that it can tilt up to two degrees before a hydraulic group is overloaded.”

Safer and more efficient
These rules have always let the industry do its work safely. However, when implemented almost 40 years ago, they were based on static trailers. Since then, loads have significantly increased in size and weight. At the same time, the axle load capacity of trailers has increased, making margins smaller and exact calculations more relevant.

With this in mind, Mammoet concluded that it is time to reassess industry standards and develop a verified calculation method that incorporates the effects of multiple dynamic forces such as the acceleration and deceleration of the trailer, the forces exerted by the wind, the slope and camber of the road, and the surface on which the load is transported.” Detailed information “This means we thoroughly engineer what a trailer can and cannot do in each specific situation,” explains Senior Engineer Jurjen de Vries, who was part of the team that developed Dynamic Stability. “Instead of giving a yes or no answer to the question ‘Are we within the allowable limit?’ we can provide clients, operators and other stakeholders with detailed information on the strength and stability margins for each individual transport project in a single, easy to understand graph.”

Close-up of transport with hydraulic trailers
All in all, Dynamic Stability can ensure a higher level of safety and provide clients with more detailed safety information for their projects. In some cases, it helps us to come up with more efficient transport approaches as well. Mammoet will be enhancing and expanding the Dynamic Stability method in the coming years.

The company helps clients improve construction efficiency and optimizes the uptime of plants and installations. For that purpose, Mammoet offers solutions for lifting, transporting, installing and decommissioning large and heavy structures in the petrochemical, offshore, power, and civil industries.
For more: mammoet.com.

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