Sunday, November 29, 2009

CENTRIFUGAL PUMPS – 2

Continued from CENTRIFUGAL PUMPS – 1

HOW TO CALCULATE NPSH AVAILABLE:

The following parameters shall be considered when calculating NPSH.

a. Vapour pressure

b. Static head

c. Friction .

d. Strainer drop

e. Suction pressure

The empirical formula to calculate NPSH is

1. Assume some line configuration to get total equivalent lengths and convert that
in to friction drop.

 

Elevation in Meters

Elevations in Meters

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LS1 –LS2 LEVEL HIGH ALARM
LS3-LS4 LEVEL LOW ALARM
LS5-LS6 LEVEL LOW ALARM & TRIP OF PUMP
LEVEL SWITCH IS OF DISPLALER TYPE.
SETTING IS 70 MM BELOW THE LEVEL.

Proposed Location of Level Switches

 

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