Pump and Gas Moving Equipment Flashcards
(23 cards)
in pumps, if suction pressure (very slightly) greater than vapor pressure
cavitation
are included on the manufacturer’s pumps furnished/labels
(NPSH)_R
most widely used for transport of all types of liquids
centrifugal pump
these are used for compressible fluids
fans, blowers, compressors
this has low first cost, quiet operation, adaptability (motor or a turbine drive), and less space needed
centrifugal pumps
gas volumes at higher pressure than fans
blowers and compressors
Pressure differences are considerable
pumps
Density of fluid is constant and large
pumps
this is equal to the developed pressure head across the pump
actual work of pump
Heavy construction is needed
pumps
discharges gases at low pressures
fans
higher gas volumes and pressure rises to > 5kPa
turboblowers and centrifugal compressors
this causes bubbles collapse causes noise, vibration, and damaged impeller blades
cavitation
this increases the velocity, elevation, and pressure
forces
Device to move or transport a liquid
pumps
to avoid cavitation, pressure at the pump inlet (suction) must exceed the vapor pressure by a certain value called the?
net positive suction head
these are used for incompressible fluids
pumps
in pumps, this depends on pressure difference between discharge and suction; independent of pressure level
power
these are the driving force in the transportation of fluids
gravity and force
these are used for AC and ventilation systems
fans and blowers
this causes no liquid may be drawn into the pump
cavitation
this reduces pump capacity
cavitation
discharges gases at high pressures
blowers and compressors
