Absorption of a pump for fluid.

The required power by a fluid pump depends on a lot of parameters, like as:

• Density of the fluid you have to move.
• Required fluid flow rate.
• Total hydraulic head.
• Global efficiency (hydraulic, volumetric, mechanic).

Between the required parameters, the most difficult to estimate are the efficiency, they depends on the sequent factors:

• Superficial roughness of the components passed by fluid.
• Construction tolerances.
• Shape of the snail and of the impeller.
• Mechanic friction (endurance, bearings etc...)..

Using this app, selecting correctly the kind of the pump, you obtain results that are sufficiently trustworthy, useful to estimate the absorbed current, consumed energy or the cost of the plant.

Data input

Fluid characteristics.

Selection of the kind of fluid

User data Water Salt water Gasoline HYCOOL 45 Kerosene Water-glycol 42% Diesel fuel for motor vehicles Diathermic oil ISO VG 32 Hydraulic oil H-LP 32 Oil SAE 30

Density of fluid at 20 °C

kg/dm³

Plant data.

Kind of pump

General centrifuge 1450 rpm General centrifuge 2900 rpm Multi-stage centrifuge 2900 rpm Self-priming centrifuge 2900 rpm Open impeller centrifuge 2900 rpm Submerged centr. dirty water 2900 Generical volumetric

Required flow rate .. Q

l/s l/min m³/h m³/sec

Required fluid pressure .. H

mm H2O m H2O kg/cm² bar psi

Results.

Absorbed power .. P

W kW CV hp

Notes.
Since the real efficiency values are not the same for every manufacturers and for every dimensions of the same kind of pump, here there are averaged values.

Low quality pump, with impeller and snail with too large construction tolerances or bad built could have efficiency also really smaller respect as given by the app.