Pumps Flashcards
What is a centrifugal pump?
is a non-positive displacement pump
that uses a rotating impeller to impart velocity pressure
on a fluid and then a volute to convert that velocity
pressure into static pressure
What is a circulator?
is a centrifugal pump that moves fluid in a
closed loop
Where are circulators used?
in the HVAC they are used industry to push fluids in a closed loop
How is velocity pressure changed into static pressure?
Forcing the water flow through an increasing cross
sectional area of the volute channel. As the channel size increases the
velocity pressure decreases and the static pressure increases
What are three types of bearings used on pumps?
Waste Packed
Oil Ring
Greased Roller Bearings
How do you calculate static pressure?
PSI = feet➗2.31 feet/psi
What is the pump discharge head calculation?
𝑷𝒓𝒆𝒔𝒔𝒖𝒓𝒆 (𝑷𝑺𝑰) = (𝑯𝒆𝒂𝒅 (𝒇𝒕)×𝑺𝒑𝒆𝒄𝒊𝒇𝒊𝒄 𝑮𝒓𝒂𝒗𝒊𝒕𝒚 (𝑺𝑮)) / (𝟐.𝟑𝟏 𝒇𝒕/𝒑𝒔𝒊)
What is pump law #1?
Pump Law #1 (Volume and Rotational Speed)
GPM2/GPM1=RPM2/RPM1
What is pump law #2
Pressure and Rotational Speed
HEAD2/HEAD1=(RPM2/RPM1)^2
What is pump law #3
Horse power and Rotational Speed
BHP2/BHP1=(RPM2/RPM1)^3
What is bernoullis law
Increase in fluid flow includes an increase in velocity pressure. Fluid flow increase results in a decrease static pressure.
What are the 3 types of pump bodies?
In-line, close coupled, base mounted
What are the 3 types of volutes?
Single, double, and vaned diffuser
What are the different types of pump seals?
Packed, and mechanical
What are the 2 different types of pump couplings?
Equalized spring, and flexible disk
