An Engine Room Crane is a very important tool for the maintenance and overhaul of the marine equipment. This is because the marine equipment has weight which is too heavy and beyond the capacity of human to lift it.
The cranes come in various configuration and capacity. Generally, a E/R crane has SWL of 0.5-15 tonnes. On a medium size ship, its SWL is 5 tonnes.
Pic Courtesy: oriental precision
FIG.: Engine room crane
Safeties in engine room crane:
- Electromagnetic fail safe brakes
The brake pads are always in applied state and pushed by magnetic springs when not in operation or when there is a power failure.
As the crane is operated or the power is supplied, the spring gets pulled inward or compressed due to the electromagnetic effect of the current. This allows the crane to be operated normally.
As soon as power failure occurs, solenoid is demagnetized and brake is applied on the rotor. It is provided so that load do not fall in case of power failure.
What is the function od dead mans handle in o/h crane?