Explosion-Proof Wire Rope Hoist Requires for LNG Systems

Cranes and hoists are mostly used in LNG systems for routine maintenance. For the LNG tank in Finland, it was necessary to develop a special maintenance crane capable of operating in extreme temperature conditions and severe frost.

DQCRANES has solutions that fit the applications. The Ex series wire rope hoists are the basis for customized explosion-proof solutions. With their modular systems, wire rope hoists can be manufactured in various SWL variants and designs. The reliability and safety of the crane systems can only be guaranteed long-term if all important components are easily accessible for maintenance work and readily available spare parts.

Special cold-resistant steel and heated motors enable use in temperatures between –25 °C and +40 °C. To guarantee explosion protection according to ATEX 95, thermistors monitor the inside of the explosion-proof enclosure and the motors. Heaters keep the crane in working order even in heavy frost. Only when outdoor temperatures drop below –25 °C or when the sensors inside the enclosure measure temperatures under –20 °C, the crane switches itself off. Additionally, a special coating prevents water in the air and high salt content from harming the crane.

This explosion proof electric hoist was possible to install the drive of the slewing crane, the travel limit switches, and the main junction box in the safe area. All the electrical components of the wire rope hoist were integrated into the main junction box, making it possible to dispense with the explosion-proof control box.