When the diesel engine of a deck crane failed, it caused major handling problems for an offshore platform operating in the Dutch sector of the southern North Sea, problems that were solved with the use of J D Neuhaus air operated hoists. The crane was operating at 40 meters above sea level and provided a lift capacity of 20 metric tons. Replacing the broken engine, which itself weighed-in at approximately 2755lbs, presented some logistic problems. The diesel engine replacement operation was successfully undertaken by the Gerritsen On- & Offshore Services BV company from their base in Amsterdam, with the work being completed in approximately one week.
As the replacement engine was too large and heavy to be ferried by helicopter, a lifting device was needed, that met requirements such as explosion-proof, lightweight and easy to handle to lift the replacement safely from the supply vessel. The suitable lifting device was sourced from the J D Neuhaus range of air operated hoists available in the Gerritsen rental fleet. It was a Profi 2TI model which had a lift capacity of 2 metric tons. This model is available as standard with a 3 meter lift, having an overall weight of approximately 240lbs including the control system. This product was easily modified to provide the 40 meters lift required on site, involving an additional weight for the twin chain hoist mechanism at approximately 4.5lbs per meter run.
With the replacement engine and its lifting equipment being transported by a supply vessel (16 hours sea time), provision was required for a further primary lifting unit to handle the Profi 2 TI hoist and its 40 meters drop of twin chains utilized for the major lifting operation. Once again, equipment that was light enough to be delivered to site by helicopter was selected from the Gerritsen rental fleet. This was a J D Neuhaus air operated Mini hoist, providing 2200lbs lift capacity to handle the larger and more powerful Profi hoist and its 40 meter chains. The Mini hoist plus an appropriate beam clamp for the hoist suspension support was helicoptered in (30 minutes air time) and mounted ready for the primary lift operation of the Profi hoist and chains utilizing a big bag container. The more powerful Profi unit was then used to replace the Mini hoist, utilizing the same beam clamp installation. The Profi hoist with a 2 metric ton lifting capacity was then utilized to undertake the more difficult lift and location of the replacement diesel engine utilising a sling assembly. The work was undertaken with one rig personnel for safety inspection, together with one rigger and three scaffolders.
The J D Neuhaus range of air operated hoists are universally deployable, incorporating explosion protection and are suitable for use in hazardous areas. The Mini series is available in load capacities of 275, 550, 1100 and 2200lbs together with a manipulator version providing for one handed operation of lift, lower and hoist traverse operations. These products are explosion protected and feature an Ex classification of Ex II 3 GD IIA T4.
The Profi series hoists offer a more rugged build quality for heavier duty operations, and can be supplied with lift capacities from 550lbs up to a full 100 metric tons. 100% duty rating and unlimited duty cycles are provided as standard, ensuring no down time and low maintenance requirements, They are supplied as standard with classification Ex II 2 GD IIA T4 / II 3 GD IIB T4, with increased spark protection to Ex II 2 GD IIB T4 and for explosion group IIC : Ex II 2 GD IIC T4. These products are insensitive to dust, hu
