Water Pump of the six basic performance parameters

Water Pump The basic performance parameters and the significance of Water Pump Model

1, Water Pump of the six basic performance parameters of

Water Pump basic performance, usually by six parameters that can be personalized.

1. Flow (pumping)

Do not pump in the unit volume of liquid within the carrier. With the letters Q, said the volume of flow units are commonly used M³ / h or L / s. Weight flow units are commonly used t / h.

2. Head (total head)

Water Pump to the unit weight (1kg) of liquid made by the power, that is unit weight of liquid through the Water Pump, after its energy value. With the letter H, said the unit is kg · m / kg, can also be converted into pumping the liquid fluid

Column height (m) representation; engineering units using international pressure, Pascal (Pa), said.

3. Shaft Power

Pump shaft is derived from the original motive power delivered to the power axis to N, said. The original motivation for the electric drive, the shaft power units to kW said.

4. Efficiency

Water Pump of effective power and the ratio of shaft power to η said. Water Pump efficiency as follows:

η = N_u / N

Where N - shaft power, kW;
N_u - effective power, that is, per unit time of liquid flow through the Water Pump received from the Water Pump energy, kW.

Water Pump of the effective power is:
Nu = γQH/102

Where Nu - effective power, kW;
γ - the capacity of the liquid, kg/m3
Q - flow rate, m³ / s;
H - head, m.

5. Speed

Water Pump Impeller transit speed, usually the number of times per minute transit, said the letter n said. Common units of r / min. In the reciprocating pump speed is usually expressed as the number of reciprocating piston (Sub -

/ min).

6. To allow the vacuum suction on the height and NPSH

To allow a high degree of vacuum suction on the Water Pump in the standard refers to a state (ie, temperature of 20⁰C, the surface pressure of 1 atm), when running, Water Pump maximum allowable height of the suction on the vacuum. With Hs said, single

Bit of mH₂O. Water Pump Plant Hs commonly used to reflect the Centrifugal Pump of SAP.

Water Pump NPSH refers to the entrance of the unit weight of the liquid has more than saturated vapor pressure of the rich energy. To Hsv said unit mH₂O. Water Pump NPSH plant commonly used to reflect the axial flow pump,

Boiler Feed Water Pump such as SAP. Water Pump NPSH in the samples are also the â–³ h expressed in.

Hs value Hsv value they are from a different angle to reflect the Water Pump water absorption can be good or bad parameters, Hs the larger the value, Water Pump water absorption can be better; Hsv the larger the value, Water Pump water absorption can be worse.