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Mechanical pumps are the second most common machine in the world (after the electric motor), so here are some of the most commonly used pumping terms and symbols.

TERMS

SYMBOL

UNIT

Flowrate

Q

L/s

Head

H

m

Pressure

P

kPa

NPSH Available

NPSHA

m

NPSH Required

NPSHR

m

Velocity

V

m/s

Density

ρ

kg/m³

Gravitational Acceleration

g

m/s²

Efficiency

η

Rotational Speed

N

r/min

Area

A

Absolute Viscosity

μ

mPa.s

Kinematic Viscosity

v

mm²/s

Specific Gravity

S.G.

Total Dynamic Head

HZ

m

Friction Head

Hf

m

Static Suction Head

Hs

m

Static Discharge Head

Hd

m

Atmosphere Pressure Head

Ha

m

Velocity Head

Hv

m

Total Static Head

Hst

m

Vapour Pressure Head

Hvap

m

Reynolds Number

R

Friction Factor

f

Length of Pipe

L

m

Internal Pipe Diameter

d

mm

Absolute Roughness

e

mm

Resistance Coefficient

K

Total Suction Head

Hss

m

Total Discharge Head

Hds

m

Article courtesy of Brown Brothers Engineers Australia Pty Ltd

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