Technical data

CHAP-03 BRIEF SYSTEM DESCRIPTION Page 4 of 20
existing conveyors Y14 & Y18. These two conveyors shall have stand-by
drives. The upgraded conveyor shall be provided with new drive
(1W+1S), belt, 35 degree carrying and 10 degree return idlers. The
drives of upgraded conveyor Y7-12 and Y7-13 shall be of 1 step higher
rating. The belting shall be 1400mm wide and N/N grade of 1250 kN/m
rating minimum.
The proposed stream connecting the new Coal Tower No - 7, comprises
of new belt conveyor nos. Y11-131, Y11-132, Y11-133, Y11-134 &
reversible shuttle conveyors Y11-135 & Y11-136. The existing chute
feeding to the existing Conveyor No. Y-15 will be replaced by a
bifurcated chute fitted with a 2 position motorised diverter gate to feed
the new conveyor no. Y11-131. The coal will be conveyed to the new
coal tower no.-7 via new conveyors Y11-131, Y11-132 & Y11-133
through new junction house no. 11A & 11B. The stream rated capacity
shall be 600t/h.
Reversible shuttle conveyors Y11-135 & 136 shall be provided at the top
of the coal tower no.-7. These shuttle conveyors shall be fed by
conveyor Y11-134 through a split diverter gate. Each of the shuttle
conveyors will be of 400 t/h capacity and shall be mounted on parallel
tracks and can be placed on different compartments of the coal tower to
uniformly distribute the coal charge in the coal tower. For this purpose
suitable nos. of limit switches shall be provided.
Additionally, the coal tower shall be provided with 18 nos. of level
monitors for giving continuous measurement of level of coal in the coal
tower.
A belt weigh scale shall be provided on the new conveyor no. Y11-132
to indicate the flow rate & total quantity of coal fed to the coal tower.
The new equipment & conveyors shall be interlocked & controlled with
the existing coal handling plant from the existing control room.
The existing system of LSTB shall be extended to all the new units up to
the top of new Coal Tower no.-7 for communication.
Facilities for dust suppression, fire fighting facilities and proper
illumination of galleries and junction house is included in the scope of
work.
The conveyor drives of 30 KW and above shall be provided with fluid
coupling. All coupling bolts shall be replaceable without shifting of drive
components. Chutes shall be lined with 8mm thick 409M SS liners. Each
discharge legs of the chutes shall be provided with chute jam indicators.
Flap/ Diverter gates shall be lined with 8mm thick SS 409M liner plates.