Exploration • Drilling • Field Services
General lifting and load movement solutions
Manfred Müller reports on a range of handling and lifting equipment for the toughest offshore environments and engineered for extremes.
A
blow out prevention (BOP) handling unit incorporating four J D Neuhaus type EH50 air operated monorail hoists has been supplied to the Maersk offshore rig Guardian in the
North Sea off Norway, for synchronised BOP lifting and handling during both pre and post drilling operations. Two hoists are mounted on each of the twin
parallel overhead rails, with each hoist providing 50 tonne load and 20 metre lift capacities for between deck operations. With the two sets of hoists operating together, a combined lift capacity of 200 tonnes was made available. Synchronised operation of all linear movement and lifting operations of individual, paired or all the four hoists when used in conjunction, was provided with JDN type F multi-function controllers incorporating the main air emergency stop together with a load monitoring device. Te largest purpose built offshore crane system
constructed to date by J D Neuhaus was a semi portal, A-frame design supporting twin overhead horizontal track beams each fitted with a single hydraulic EH 40-H hoist unit.
Tese hoists can be operated individually or simultaneously from one controller, and when used in conjunction a total lift of 80 tonnes is possible with a 12 metre lift height being provided over a 7.5 metre span. A JDN Profi 6 TI-H hoist with 6 tonne lift capacity was also supplied to cover other operational and service requirements. Te crane was specified to comply fully with
offshore duties including operating at temperatures down to -20°C. Survival conditions also had to be maintained in turbulent weather conditions to cover inclines from the horizontal of the rig of 3° with the crane loaded or 27° when unloaded. All the JDN products combine a rugged build quality with high performance, 100 per cent reliability and the utmost in safety. Teir JDN Profi TI hoists are also 100 per cent duty rated and require low maintenance, so eliminating unnecessary downtime. Te products are also impervious to dust and
damp working conditions and operate within a temperature range of -20°C to 70°C. Where supplied for offshore operation, on either rigs or ocean going vessels, then the equipment is provided with a full ‘Offshore Package’ which includes extra corrosion protection to cater for rough, salty weather conditions. Te main body component parts of both hoists and cranes are supplied with a four layer marine paint top coat, having a 280 microns total minimum dry thickness in standard traffic yellow RAL 1023 colour. Exposed products such as valves and valve heads, together with suspension chains are manufactured from stainless steel, together with bolts and nuts less than 12mm in size. Larger threaded bolt ends and nuts, together with
trolley wheel bearings are otherwise protected with grease packed covers, while the chain containers are supplied with a galvanised finish. All hoists in the JDN Profi TI range incorporate
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Fig. 1. A J D Neuhaus low headroom hoist being used for BOP handling operations.
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