4. VOLUTE CASING
IT IS OF SPIRAL TYPE IN WHICH AREA OF
FLOW INCREASES GRADUALLY. INCREASE
IN AREA ,VELOCITY OF FLOW DECREASES
HENCE INCREASES PRESSURE OF FLOWING
WATER THROUGH CASING
5. VORTEX CASING
IT IS A CIRCULER CHAMBER INTROUDUCED
BETWEEN CASING AND IMPELLER . BY DOING
THIS FORMATION OF EDDIES IS REDUCED TO A
CONSIDERABLE EXTENT HENCE MORE
EFFICIENCY THAN VOLUTE CASING
6. CASING WITH GUIDE
VANES
IN THIS IMPELLER IS SURROUNDED BY A SERIES OF GUIDE
VANES MOUNTED ON A RING KNOWN AS DIFFUSER. GUIDE
VANES ARE DESIGNED IN SUCH A WAY THAT WATER FROM
IMPELLER ENTERS THE GUIDE VANES WITHOUT SHOCK. ALSO
AREA OF GUIDE VANES INCREASES THUS REDUCES VELOCITY
AND INCREASES PRESSURE
7. IMPELLER
ROATING PART OF PUMP IS KNOWS AS IMPELLER
.IT CONSIST OF A SERIES OF BACKWORD CURVED
VANES .IMPELLER IS MOUNTED ON A SHAFT
WHICH IS CONNECTED TO A SHAFT OF AN
ELECTRIC MOTOR
8. TYPES OF IMPELLER USED
IN CENTRIFUGAL PUMP
1-OPEN IMPELLER
2-CLOSED IMPELLER
9. BEARING HOUSES
IT HOUSES THE BEARING FOR THE PUMP AND
SUPPORTS THE ROTOR ASSEMBLY . IT COMPRISES
OF A COOLING JACKET AND PROVIDES SPACE FOR
LUBRICATING OIL FOR BEARING
10. SLEEVES & BUSHES
SLEEVES ARE FITTED ON THE SHAFT TO PROTECT IT
FROM DIRECT CORROSION.SO IT ROTATING MEMBER
BUSHES ARE FITTED ON CASING
SLEEVES ARE MADE HARDER MATERIAL THAN BUSHES
12. BARREL
THIS IS APPLICABLE FOR VERTICAL PUMPS WHERE
NET SUCTION POSITIVE HEAD AVAILABLE IS VERY
LOW OR NO VESSEL FOR MOUNTING THE PUMP IS
AVAILABLE
13. STRAINER & FOOT
VALVESTRAINER IS FITTED TO LOWER END OF SUCTION PIPE
.ITS FUNCTION IS TO FILTER THE WATER SO THAT NO
PARTICALS ENTERS INTO THE CASING
A FOOT VALVE IS A NON RETURN VALVE OR ON
WAY TYPE OF VALVE
14. SUCTION & DELIVERY
PIPE
A PIPE WHOSE ONE END IS CONNECTED TO INLET OF PUMP &
OTHER END DIPS INTO WATER IN A SUMP IS KNOWN AS
SUCTION PIPE
A PUMP WHOSE ONE END IS CONNECTED TO OUTLET OF PUMP
AND OTHER END DELIVERS THE WATER AT A REQUIRED
HEIGHT IS KNOWNS AS DELIVERY PIPE
15. WORKING OF
CENTRIFUGAL PUMPCENTRIFUGAL PUMP WORKS ON THE PRINCIPLE THAT WHEN A CERTAIN
MASS OF LIQUID IS MADE TO ROTATE ALONG THE IMPELLER ,IT
IMPRESSES A CENTRIFUGAL HEAD .IT CAUSES THE WATER TO MOVE
RADIALLY OUTWARDS AT HIGHER VELOCITY AND CAUSES THE WATER
TO RISE TO A HIGHER LEVEL .THE MOTION OF WATER IS RESTICATED BY
CASING OF PUMP ,IT RESULTS INTO PRESSURE BUILD UP.IN ADDITION
,THE CHANGE IN ANGULAR MOMENTUM OF LIQUID DURING ITS FLOW
RESULTS INTO INCREASE IN PRESSURE HEAD
20. PUMP APPLICATIONS
1-TO PUMP WATER FROM SOURCE TO FIELDS FOR
AGRICULTURE
2-IN PETROLEUM INSTALLATIONS TO PUMP OIL
3-IN STEAM AND DIESEL POWER PLANTS TO CIRCULATE FEED
WATER AND COOLING WATER RESPECTIVELY
4-PUMPING OF WATER IN BUILDING
