Search by company

Handling system compensates for wave motion

Edited by the Engineeringtalk editorial team Dec 24, 2002

JD Neuhaus has completed an 80t handling system for offshore oil/gas operations.

JD Neuhaus has completed an 80t handling system for offshore oil/gas operations.

The system comprises two 40t air-operated EH40 monorail hoists, deployed as double lifting gear for BOP handling, which have been specially adapted for on-ship use even in rough seas.

The bespoke monorail system, with hoist units operating in parallel, incorporates major design modifications from the general EH40 range.

These include a rack and pinion drive which prevents the trolley wheels from slipping when a ship is pitching or rolling due to wave action.

The trolley also features a special suspension which dampens side swings of up to 5.7 degrees.

The suspended load is therefore prevented from any undue swinging motion which, if not restricted, could easily damage the load, the hoist and its surroundings.

Further potential damage is also prevented in the event of a possible power failure or with very turbulent sea conditions.

The load can be lowered to a safe position using the gear transmission system to provide a controlled descent.

Normally with the EH40 hoists the brake cannot be manually operated, so a manual brake release lever has been incorporated to permit automatic controlled load lowering under adverse conditions without the need for hand controls or a power supply.

JD Neuhaus air or hydraulically operated hoists are a compact low headroom design, ideal for handling high loads in confined spaces.

They can operate over a temperature range of -20 to +70C and are impervious to the effects of aggressive, damp or dusty atmospheres.

This makes them particularly suited for the conditions of the offshore industry.

Other applications for the EH series include the cement or chemical industries, together with mining or power plant operations.

Increased sparking protection is also available for use in the most hazardous explosive conditions.

Other safety features, particularly suited to the hazards posed by offshore operations, include a low maintenance starting motor, disc brakes for steadfast load holding even in the event of air/hydraulic power interruption, anti-climb/drop devices, together with lateral guiding plates and an emergency shut off valve.