1.4Technical conventions

Quantity

Symbol

Unit

 

 

 

 

 

 

Dynamic viscosity

µ

 

 

mPa.s = cP (Centipoise)

 

 

 

 

 

 

Kinematic viscosity

ν = µ

 

kg

 

 

ρ

 

ρ = density

3

 

 

 

 

 

[dm ]

 

 

 

 

 

mm2

 

 

 

 

ν = kinematic viscosity [ s ] = cSt (Centistokes)

Note! In this manual only dynamic viscosity is used.

 

 

 

 

 

 

 

Pressure

p

[bar]

 

 

 

 

 

 

 

p

Differential pressure = [bar]

 

 

 

 

 

 

pm

Maximum pressure at discharge flange (design pressure) = [bar]

Note! In this manual, unless otherwise specified - pressure is relative pressure [bar].

 

 

 

 

 

Net Positive

NPSHa

Net Positive Suction Head is the total absolute inlet pressure at

SuctionHead

 

 

 

the pump suction connection, minus the vapour pressure of the

 

 

 

 

pumped liquid.

 

 

 

 

NPSHa is expressed in meter liquid column.

 

 

 

 

It is the responsibility of the user to determine the NPSHa value.

 

 

 

 

 

 

NPSHr

Net Positive Suction Head Required is the NPSH determined,

 

 

 

 

after testing and calculation, by the pump manufacturer to avoid

 

 

 

 

performance impairment due to cavitation within the pump at rate

 

 

 

 

capacity.

 

 

 

 

 

The NPSHr is measured at the suction flange, at the point where

 

 

 

 

the capacity drop results in a pressure loss of at least 4%.

 

 

 

 

 

 

Note! In this manual, unless otherwise specified, NHPH = NPSHr

When selecting a pump, ensure that NPSHa is at least 1 m higher than the NPSHr.

A.0500.551 – IM-TGMAG/02.00 EN (02/2008)

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SPX Cooling Technologies TG MAG15-50, TG MAG58-80 Technical conventions, Quantity Symbol Unit, Differential pressure = bar

TG MAG86-100, TG MAG23-65, TG MAG58-80, TG MAG15-50, TG MAG185-125 specifications

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