The coal conveyor belts in coal handling plant of thermal plants are protected by following ways
1). PULL CHORD (Manually Reset type) :
This is a emergency stop switch shall be located on both sides of belt conveyors at a a spacing of 20 Mtr. along the walkways for the entire length of conveyor for emergency stopping of conveyor.
2). SWAY SWITCH :
This switch is of self resetting type and it shall be provided at a spacing of 45 Mtr to limit belt sway to permissible extent.
3).ZERO SPEED SWITCH:
This switch is non-contact (Proximity) type electronic switch.
4). CHUTE BLOCKAGE SWITCH :
This switch is of proven type and it shall be provided at a suitable height on each leg of the conveyors discharge chute, Vibrating Screens by pass chutes ,Crusher feeding chutes ,Tripper discharge and feeding chutes nearest skirt boards.
Chute blockage switch shall trip the feeding conveyor in case of chute blockage and protect the feeding conveyor equipment.