PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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19.16 Specification of Instrumentation.<br />
Level indication/Control System.<br />
Level indication system shall be consisting of 1 level indicator for the Intake Well<br />
common for all the Pumps. Level Control System shall be comprising of 1 float operated<br />
displacer type level switch for each pump in the Intake Well for Auto Tripping of the<br />
vertical Pumps at very low water level (preset level below the low water level) and the<br />
arrangement will be such that the pump shall not be started in case of low level at the<br />
Intake Well. To reduce the effect of water turbulence in the Intake Well, Stilling pipe shall<br />
be provided for proper functioning of the level floats for both level indication and level<br />
control system.<br />
For the Intake Well in addition to the magnetic level switch operated indicating<br />
arrangement common for all the Pumps as mentioned above, a common mechanical float<br />
operated scale board with pointer type level indicator shall be provided. The installation<br />
shall be complete with mounting nozzles and flanges, anchor bar, float, guide wires, float<br />
wire, pulley and pulley saps, counter weight, scale board and pointers etc..<br />
A) Specification of Level Indicator:<br />
1. Quantity to be provided : 1 no.<br />
2. Type : Float type mechanical level indicator complete with float<br />
and guide wire, nozzle with flange, pulley and pulley<br />
shaft counter weight, scale board with pointer etc.<br />
3. M.O.C.:<br />
Float, guide wire and guide rope.<br />
Nozzle with flame.<br />
Pulley and pulley shaft<br />
Counter weight.<br />
Scale Board.<br />
:<br />
:<br />
:<br />
:<br />
:<br />
SS 316<br />
MS, IS 2062<br />
SS 304<br />
C.I<br />
Aluminium<br />
4. Make : Levcon instruments/D.K Industries/Scientific Serve / MSI<br />
B) Specification for Buoyancy type level control switch:<br />
1. Quantity to be provided : 3 nos.<br />
2. Type : Top mounted magnetic level switch displacer operated<br />
3. Enclosure Class for switch : Weather proof, IP - 66<br />
4. No. of contacts : 2 nos., SPDT<br />
5. Switch type : Micro switch<br />
6. M.O.C.:<br />
Displacer, wire pipe, spring<br />
housing, sleeve pipe, sleeve rod<br />
Sleeve<br />
Spring<br />
Flange cage<br />
Switch box, housing<br />
:<br />
:<br />
:<br />
:<br />
:<br />
SS 304<br />
SS 410<br />
Spring Steel<br />
MS, IS - 2062<br />
Aluminium<br />
7. Current rating, Voltage : 5A, 230 V<br />
8. Stilling guide pipe (perforated) : MS, IS – 2062 (length as required to suit the wire rope)<br />
DTS : Detailed Tender Specification. Page 200
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