Bloomfoss Winches designed in accordance to ISO 3730 Series
Winch drum load – The allowable calculated stresses of any affected part of the winch, based on simple elastic theory, shall not be greater than 0.4
times the upper yield strength ( ReH) or 0.2% proof strength, non proportional extension ( Rp0.2) of the material.
Drum Diameter – The drum diameter shall be not less than 16 times the diameter of the rope.
Drum Length – The large loads should not be applied while more than four layers of rope are reeled on the drum, otherwise shortlife of rope will
result; it is recommended that a split drum should be used, and the numbers of layers on the storage section may be increased.
Brake – For hydraulic or steamdrive, when brining the operating device to the stop or braking position, and also when there is no power on the winch,
the drum shall be capable of holding a load on the hawser of 1.25 times the drum load, and the movement of the rope shall be controlled within 1.0 m/min.
Prime mover of winches – Mooring winches shall be driven with independent prime mover, and be able to control the hauling, veering and speed of the drum.
Maxiumum Torque of the prime mover – The allowable stresses in the affected parts shall not be greater than 0.9 times the upper yield strength
(ReH) or 0.2% proof strength,non proportional extension ( Rp0.2) of the material.
