Published: 29/10/2015

October 2015

This month saw the completion of a substantial contract for two hydraulic cylinders bound for the offshore industry in Brazil.

Any offshore, or marine cylinder has technical challenges and these two were no exception with the end customer of Subsea7 requiring additional LLoyds Register certification on design, build and performance.

The cylinders are intended for use on a ship's crane which means safety is perhaps more critical than ever. With a closed length of just over 4.7m, these cylinders extend out to just over 8.2m - almost double the size of the closed cylinder and so strength of the shaft and seals is very important.

hydraulic cylinder marine craneAs indeed is the pressure the cylinder operates at in order to be able to handle the required loads.

The cylinders need to operate at a pressure of 280bar, so nothing was left to chance.  As a supplier of hydraulic fluid, the Cylinder Service Centre was able to supply the fluid inside the cylinder, pre-bled, to the correct level.

Our in-house testing facilities meant that the cylinders could be both pressure tested and charted to ensure they would pass the required stringent Lloyd Register external tests.

The offshore environment is horribly corrosive - no matter what the end application. These cylinders were therefore designed with stainless steel rods and finished in an ISO12944 compliant C5M coating - which is defined as resistant in 'very high corrosivity' conditions.

Resisting corrosion will extend the life of the units as well as reducing maintenance requirements. However, the units are designed to use gland collects rather than threads to ensure they are maintenance friendly so that, as and when maintenance is required, it will be quicker and less expensive that it would be otherwise.

Built, pressurised, third party tested and boxed for shipment to Brazil in 8 weeks from design approval, this project shows not just the technical, but the geographical reach of our business.

To Subsea7 we say 'obrigado' for the contract and 'viagem segura' to the hydraulic cylinders as they start their journey to Brazil.