• J D Neuhaus GmbH and Co KG

Hoists for Underwater Operation

J D Neuhaus GmbH & Co KG has launched purpose designed Hoists suitable for heavy-duty underwater operation. Lifting and handling products manufactured by the JDN are engineered for performance, reliability and longevity when operating in extreme environments of dirt, dust, high humidity, and even potentially explosive atmospheres. Some of the toughest and more unusual conditions are currently experienced by today’s underwater aquanauts. Divers are very often working alone, in conditions of variable depth water pressures and temperatures, combined with poor visibility while also battling with ocean currents. With all these problems to contend with, any tools they use need to be rugged, reliable, easy to operate and comply with the highest performance standards. The viability of JDN hoists in the underwater environment has been demonstrated when their air operated hoists were successfully utilised for the removal and replacement of a 50 tonne rudder on a fully loaded bulk carrier vessel. After breakdown during a voyage from Brazil to China, the ship was first towed to a safe mooring off the coast of Venezuela, where the rudder removal and replacement work was undertaken.

Three standard air operated JDN Profi 25 tonne capacity hoists were used in conjunction for this operation, with these units being subject to full rebuild procedures after the job completion. The work was successfully undertaken at sea, without the need for cargo removal or transfer. Subsequent to this exercise, the JDN company have introduced purpose designed hoists suitable for subsea operation, incorporating uprated performance and sealing features to withstand continuous underwater operation, even at depths of 70 metres. They can be supplied for either compressed air or hydraulic operation, utilising a diver-friendly pendant controller, which is compatible with constricted, gloved-hand movements.