Exploration • Drilling • Field Services
top hook suspension mounting and feature pendant push-button controllers as standard. Tese hand controllers provide sensitive, infinitely variable or single speed control of the load lift, lower
and powered trolley
traverse movements where overhead rail mounting is utilised. Trolley mounting options include manual,
reel chain and motorised variations. All
Fig. 2. JDN Profi 100 Ti air hoist, part of a series of hoists offering lift capacities from 250kg up to 100 tonnes.
hoists are also fully ATEX rated for operation in hazardous or potentially explosive atmospheres to a standard classification of Ex II 2 GD IIA T4 / II 3 GD IIB T4. Standard safety features of the hoists include integrated adjustable overload protection for load ratings of one tonne and above.
A self-adjusting fail-safe braking mechanism is fitted, together with trolley anti-climb drop devices and an emergency stop switch integrated in the main power supply. An emergency lowering device can also be supplied for the Profi TI hoists covering lift capacities from 25 to 60 tonnes. Tis involves
Fig. 3. Final installation work being undertaken by JDN hydraulic specialists and crane experts prior to dispatch of their largest crane produced to date.
fitting a separate air tank, with two additional buttons also incorporated into the hand controllers. Tis air reservoir is automatically maintained at the full working air pressure and acts as a positive emergency braking system when required. Te device becomes operable in the event of a
severe reduction or total loss of mains air pressure, with a two-handed control operation provided to avoid unintentional lowering. One control button selects between normal hoist operation and emergency lowering, with a second button providing braking to ensure a controlled lowering and safe grounding of the suspended load under the action of its own dead weight. Additional optional safety features include rack and pinion trolley drives, Delta-P overload protection and load monitoring together with air, hydraulic, radio or electrical remote controllers. Special purpose hoists engineered for extreme conditions can be supplied to cover operations at Arctic temperatures down to -45°C, together with underwater hoists for operation down to 70 metres below water levels. Certification by Det Norske Veritas can also
be provided on request, to comply with safety requirements involving applications for offshore cranes as well as power driven hoists. Te standard ATEX classification is according to EC Directive on Hazardous Locations 94/9/EEC with increased spark protection also available if required to a rating EX II 2 GD IIC T4. ●
For more information ✔ at
www.engineerlive.com/iog
Fig. 4. A Profi 6Ti hoist from the J D Neuhaus range, purpose designed for subsea operation and shown equipped with diver- friendly control valve.
32
www.engineerlive.com
Manfred Müller is with J D Neuhaus GmbH & Co, Witten-Heven, Germany.
www.jdngroup.com
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