FEATURE | MANUAL CHAINS
Tiger’s Atex- certified hoist lifts 20t
Ice forms on
Yale’s Arctic Edition hoist
Verlinde’s VHR EX is Atex-certified in stainless steel
and Baltic Seas, or simply work outside in winter. At such temperatures some steels tend
to brittle fracture, and to be much more vulnerable to shock loads. Fractures can occur suddenly, without prior deformation which might warn the operator of impending failure. Lubricants must be suitable for the low temperatures, or they too can promote failure. Yale’s Arctic Edition chain hoists are
customised for such conditions. They are made using appropriate materials, sold with appropriate lubricants and have been extensively tested down to ambient temperatures of -40°C. The tests include functional stress tests, endurance tests, fracture strength tests and impact tests. Consequently, they can be stored and used over a temperature range from -40°C to +50°C. They are available in capacities from 500kg to 10tons.
ATEX Explosive environments also need specialised and certified hoists. ATEX- certified manual and lever hoists are available from, among others, Yale, Tiger, Kito, Verlinde and William Hackett. Verlinde has the VHR EX sparkproof hand chain block in stainless steel, for capacities from 500kg to 20 tons. ATEX markings are Ex II 2GD c IIC T4 T+135 °C, which makes it
suitable for Zones 1 and 2 and hazardous areas 21 and 22. Spark-reducing adaptations include
bronze coated hooks and a 70 μ layer of high-resistance RAL 9006 aluminium- type powder coating. An overload limiter is standard; and there is an option to have the load chain as well as the hand chain in 316L stainless steel. Tiger’s SS20 lifts, as the name suggests, 20 tons.
CLEAN ROOM: German manufacturers Rema has a hand chain hoist for clean rooms. The cover is chrome-plated; the side plates are nickel plated, as are the top and bottom hooks. Nuts, base discs and the hand chain are of stainless steel. The standard load chain is nickel plated but a stainless steel load- chain is an option, which makes the hoist suitable for use in the food industry.
OFFSHORE AND SUBSEA Hoists for offshore and sub-sea use are also a specialised sector. William Hackett’s approach is explained by Burgess: “We have seen success by engaging with end users and understanding applications and environments where lifting equipment is used. We take a standard product, for example a lever hoist, and develop it for specific applications such as subsea. We have used surface treatments, different
materials, and marine grease, and we also change the design of certain parts. We have mechanical engineers working for us who help with this product development.” We have already described its high- capacity ROV-recovery hoist. For offshore use it also has anti-corrosion combined hoists and trolleys; its SS-L5 offshore lever hoist was the first offshore lever hoist to be awarded DNVGL ‘Saltwater Immersion test ‘verification, which certifies that it can be safely used over a 21 day single immersion and a 31 day multi immersion period. Tiger is also specialists in offshore and subsea. It has its SS20 corrosion resistant chain block, and the SS19 subsea lever hoist. Both include one-piece construction pinion gears and Tiger’s globally patented Quad Cam Pawl System. The SS19 includes a rotational inertia driven torsion switch brake and freewheeling system. This brake system was designed to counter known failure modes in commonly used mechanisms, which allow easy ingress of foreign particles into the mechanism that could affect hoist operation. This Tiger brake system is now a proven design with many thousands of hours of empirical evidence as proof of design and efficiency. Working out in a gym is one way to
develop your muscles. Why not instead put all that effort to useful work, by weight- lifting outside the gym?
www.hoistmagazine.com | June 2024 | 31
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