Pneumatics Flashcards
What is boyles law?
P1 x V1 = P2 x V2
Pressure increase will do what to velocity?
Decrease
What is kelvin?
-273.15 Celsius
Is kelvin used for Celsius or ferinheight
Celsius
What is -273.15 kelvin equal to?
0 degrees Celsius
How would 0 degrees ferinheight be expressed in rankin?
-459.73
What is rankin?
-459.73
How would you find temperature change?
Absolute +/- temperature given
What is the formula to go from Celsius to ferinheight
F = [(9/5)xC]+32
= (1.8xC)+32
What is the formula to go from ferinheight to Celsius
C= 5/9 x (F-32)
= 0.55555 x (F-32)
What does 0.55555 x (F-32) find?
The Celsius equivalent to a ferinheight
What is the main advantage of pneumatics?
Smooth operation
What are the two types of compression?
Isothermal
Adiabatic
What is isothermal compression?
Heat is generated and removed at a rate that temperatures remain consistant
What is adiabatic compression?
Increase in temperature of the air increasing the pressure
What are the 3 classifications of compressors?
Compressors
Booster fans
Vacuum pumps
What does a compressor do?
Move air from atmospheric pressure to a higher pressure
What does a booster fan do?
Moves air from above atmospheric pressure to a higher pressure
What does a vaccum pump do?
Compressed air from atmospheric pressure to below atomspheric pressure
What effects does moisture have on a pneumatic system (5)
Freezing/bursting
Remove lubrication
Hammer effect
Reduce flow
Loss of power
What should the slope be on a pneumatic line over 10 feet?
1 inch
What should compressed air system control be sized to?
Meet systems max demand
What type of dryer is the most efficient?
Refrigerant
Why is it important to ensure auto drains are oriented correctly?
So the float reads at the right times or at all
Describe relative humiduty
Amount of moisture in air at a given temperature
Can lower or higher temperatures hold more moisture?
Higher
In terms of realities humidity if the air is holding the same amount of moisture and the temperature goes down what will happen to the relative humidity?
It will go up
What is the % of realitive humidity?
The airs moisture capacity at that given temperature
What happens when realitive humidity hits 100%
Condensation begins
How do we control realitive humidity?
Dehumidifiers
Define dew point
When moisture drops out of suspension due to rapid temperature change
Define condensation
Change of physical state of matter from gas to liquid phase (reverse evaporation)
If the realitive humidity is lower will you have more or less evaporation?
More
When does condensation typically occurs in pneumatic systems?
When a vapour is cooled and/or compressed to its saturation limits
What is the purpose of air inlet filters?
Protects compressors from atmospheric airborne particles
What are the 3 ways compressors are typically cooled?
Air
Water
Lubricants
How are screw compressors less than 100hp typically cooled?
Air
What is the purpose of fins on casings and filters?
To increase surface area to aid in cooling or filtering
What is the common way water cooled is typically used?
Shell and tube
Where are after coolers placed?
After final compression stage
What component removes and filters contamination from the air prior to it entering the system?
Seperators
Where are seperators typically located?
After the cooling system
Can you find baffles inside a separator?
Yes
What are the 3 types of dryers?
Refrigerant
Deliquescent
Twin tower regenerative
What are the 3 types of regenerative twin tower dryers?
Dry purge
Heat
Combo
What is the purpose of hepa filters?
To remove particulates in air
What percentage of particulates must a filter remove from air to be considered hepa
99.7
What is the purpose of ultra violet filters?
To kill bacteria mold and viruses
What order should lubrication filters and regulators be in?
FRL
FILTER
REGULATE
LUBRICATE
what doe flow controls do?
Control speed
What are the two types of traps and drains?
Mechanical
Electrical
What is the purpose of a quick exhaust valve
To quickly dump pressure to atmosphere
How do you adjust a flow control valve
Screw
What are the two types of check valves?
Gravity
Spring
Where is a drain valve located on the receiver
Lowest point of the receiver
What is the purpose of a fusible plug?
To melt and release pressure of air temperatures climb to high
How is pressure in the receiver monitored?
Air pressure gauge
