Module 10. Pumps

Lesson 32

NUMERICALS ON PUMPS

32.1 Numericals

1. Calculate the discharge of reciprocating pump (single cutting) if area of cylinder is 0.25 m², length of stroke is 0.15 m, number of cylinder =1 and speed of pump is 50 rpm.

Sol.

A = 0.25 m²

L = 0.15 m

N = 50 rpm

n = 1

number of acting =1

= 0.03125 m³ /s

2. Calculate the power required to drive the single cutting reciprocating pump for water of following specification.

Sol.

Area of cylinder = 0.85 m²

Length of stroke = 0.35 m

Number of cylinder = 2

Speed of pump = 15 rpm

Suction head = 0.5 m

Discharge head = 1 m

3. Calculate water horse power for centrifugal water pump if flow rate is 4500 liter/h. head added to the flow is 10 m.

Sol. 

1 m³ = 1000 L

4. Calculate brake horse power for centrifugal water pump if flow rate is 1000 litres/h. Head added to the flow is 10 m pump efficiency is 86%.

Sol.

1 m³ = 1000 L