Liquid Temperature : +50; Operating Pressure; Minimum Inlet Pressure - PYD Electrobombas VERTINOX Serie Manual De Instalación Y Mantenimiento

OPERATING AND MAINTENANCE MANUAL
SERIE VERTINOX
4.2 Liquid temperature
See fi g.5, page 4, which indicates the relationship between liquid temperature and maximum
permissible operating pressure.
Note: The maximum permissible operating pressure and liquid temperature ranges apply to the
pump only.
4.3 Maximum permissible operating pressure and liquid temperature for the shaft seal Fig.2
VERTINOX 1to20 and VERTINOX 32 to 90 VERTINOX 1to20 and VERTINOX 32 to 90

4.4 Minimum inlet pressure

4.4 Minimum inlet pressure
The maximum suction lift in metres head can be calculated as follows:
H=Pb 10.2-NPSH-Hf-Hv-Hs
Pb = Barometric pressure in bar.(Barometric pressure can be set to 1 bar).In closed systems,Pb
indicates the system pressure in bar.
NPSH = Net Positive Suction Head in metres head (to be read from the NPSH curve on page 12 at
the highest fl ow the pump will be delivering).
Hf = Friction loss in suction pipe in metres head at the highest fl ow the pump will be delivering.
Hv =Vapour pressure in metres head.
Hs = Safety margin = minimum 0.5 metres head
If the calculated H is positive, the pump can operate at a suction lift of maximum H metres head.
If the calculated is negative, an inlet pressure of minimum metres head is required.
There must be a pressure equal to the calculated during operation.
Example:
Pb=1bar
Pump type:VERTINOX 10,50Hz
Flow rate: 10m3/h
NPSH (from page 12):2.1 metres head.

Liquid temperature : +50

Hv (from fi g.4):1.3 metres head
H=Pb 10.2-NPSH-Hf-Hv-Hs
H=1 10.2-2.1-3.0-1.3-0.5=3.3(metres head)
This means that the pump can operate at a suction lift of maximum 3.3 metres head.
Pressure calculated in bar: 3.3 0.0981=0.324bar
Pressure calculated in kpa: 3.3 9.81=32.4kpa
23
www.proindecsa.com / proindecsa@proindecsa.com