Pumps Flashcards
What are the three elements of a reciprocating pump?
A plunger, a Piston, a diaphragm
What do pumps create?
Flow
What can cause A pump to change when operating?
Wear, leaks, restrictions, temp of liquid
What are the two types of positive displacement pumps?
Reciprocating and rotary
What are piston and plunger pumps used for?
Creating extremely high-pressure liquids for cleaning, pressurizing systems, hydraulic testing and are common in the chemical pharmaceutical and oil field sectors.
What do rotary pumps consist of?
An rotor or rotors turning inside a closed casing with a minimum of clearance
What is a foot valve?
A check valve installed in the bottom or foot of a suction line.
What are the applications for pumps?
To feed water to boilers
To convey or meter fuel and chemicals
To circulate coolants and condensation
What are the two basic classifications of pumps?
Dynamic and positive displacements
What is pump head?
Pressure that has to overcome to be aide to move liquid through the system
How is the pumps rating and size expressed?
Expressed as a percentage of theoretical capacity
What is the most efficient impeller?
Closed.
What impellers can’t handle solids?
Semi open / semi closed.
Which impellers have weak vanes and head easily ?
Open impellers.
Why do most positive displacement pumps require a relief value?
Protect them from damage caused by excessive pressure
What is the difference between unbalanced and balance vanepumps?
Unbalanced can be variable
Balance are fixed flow
What is another name for metering pumps?
Chemical injection pumps/ chemical feed pumps s proportioning pumps, and dosing pumps.
What are the four categories of dynamic pumps?
Radial-flow, axial-flow, mixed-flow, peripheral pumps.
What is density?
The Mass or weight of a substance per unit of volume.
What is specific gravity?
Is the ratio of the density of a substance to that of water.
What is pressure?
Measure of intensity of effort described as force per unit of area
What is atmospheric pressure?
Portion of the weight of the earths weight of the earths atmosphere that bears down on an area of on square inch
What is gauge pressure?
The pressure of the liquid in the system read by a pressure gauge
What component converts mechanical energy into kinetic energy?
Impeller
