Maintenance of Regional Water Supply Schemes

8/13/2019 Maintenance of Regional Water Supply Schemes

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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

Documents

Maintenance of Regional Water Supply Schemes