maintenance of regional water supply schemes
TRANSCRIPT
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MAINTENANCE
OF
REGIONAL WATER SUPPLY SCHEMES
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AREAS OF MAINTENANCE
SR.NO AREA
1 SOURCE
2 MACHINERY
3 CONVEYANCE
MAIN
4 STORAGE, SP &
CT
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SOURCE
Which details we must have Position of strainer andblank pipes of tube well
For what To place the submersible
pump set against blank pipeWhy To prevent the sand
infiltration into tube well,
which results in frequent
failure of machinery andtube well.
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PUMPING MACHINERY
Points to take care of:-
Sr.No Description
1 Pumping machinery shall be of suitable head and
discharge.2 During repairs there are changes of altering of
head and discharge which must be taken care of.
3 Pressure gauge and water meter are essential for
monitoring head and discharge of pump
4 Fuse wire must be of required size they are very
important in saving the electric and mechanical
devices during electric fluctuations.Cont:
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5 Panel board must have suitable combination of
Contactors, Relay, HRC fuse. The input and
output cables must be according to the load
6 Panel board must have single phase preventor,
auto switch and other indicating devices in
working condition.
7 For safety rubber matting shall be provided nearcontrol panel
8 Operator shall be provided with standard hand
gloves and safe equipments for minor repairs ofcontrol panels etc.
9 Proper electrification and ventilation is necessary
for safe and healthy atmosphere.
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FUSE WIRE TABLE
Ampere Copper wire size
in SWG
Aluminum wire
size in SWG20 28 25
25 26 24
30 25 2335 24 22
40 23 21
45 22 21
50 22 20
60 21 19
70 20 19
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CHART OF CONTROL PANEL:-
HP Contactor
(ML)
Relay HRCfuse
(A)
Cablesupply
side(m
m)
CableMotor
side(m
m)
Fullload
ampere
20 1.5-2.0 13-21 63 10 4 28
25 1.5-2 13-21 63 16 8 35
30 1.5-2 20-32 80 16 6 40
35 2 20-32 80 25 10 47
40 3 28-42 100 25 16 55
45 3 28-42 100 35 16 60
50 3 28-42 100 35 16 66
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CONVEYANCE MAIN:-
Every field engineer must have factual records such as
1)Ground levels
2)Size of pipe along with length
3)Demand of water on each and every section
4)Actual position of control valves and air valves.
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Design failure of conveyance
mains When capacity of machinery alters
When design of rising main is not according
to discharge of machinery
When demand of water is not accessed
correctly.
When there is over drawl of water more
than the design.
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Maintenance of conveyance
mains Air valve must function properly
Regular greasing of sluice valves
Leakage shall be attainted properly and non
conventional methods of temporary
repairing the leakages shall be avoided.
After repairing leakage back filling of earth
shall not be avoided.
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Importance of control valves in
distribution system Regional water supply scheme consists of main,
sub main line and various branches.
The terminal pressure at the supply point varieshence the discharge flow in pipes is not justified.
Control valves shall always be operated toequalize the flow between all branches.
It is observed that many times control valves arenot operated at all and even not available in manyschemes.
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THANKS