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17 Cards in this Set
- Front
- Back
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what is the purpose of Compressed Air Systems (CAS)?
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is to provide clean, dry air in adequate pressure and amounts for use in systems.
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what systems does the (CAS) compressed air system provide air to?
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•(DSA) Diesel Start Air
•(SSA) Ships Service Air •control air for clutches •steering •remote operated valves •pneumatic tools |
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what are the 3 classified pressures for CAS?
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•High Pressure Air (HP)-pressures above 1,000 psig
•Medium Pressure Air(MP)- pressures between 151 psig and 1,000 psig •Low Pressure Air(LP)- pressure up to 150 psig |
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what are the common components that can be found in compressed air systems (CAS)?
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•air compressor
•air receiver or flask •pressure regulating valves •pressure relief valves •air/water separator or dehydrators •in/line oilers |
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what is a air compressor?
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a piece of machinery that draws in ambient air, pressurizes the air, and delivers it to the air receiver/ air flask or the end user
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what is the difference between an air receiver and an air flask?
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•an air receiver is capable of holding compressed air in pressures below 600 psig
•a air flask is capable of holding compressed air in pressures above 600 psig |
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what type of pressure regulating valve is often found in LP air systems?
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spring loaded pressure reducing valve
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what type of valve is used to relieve excess system pressure in a controled manner?
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a pressure relief valve
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what device is intended to remove moisture from compressed air?
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moisture separators
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valves shall be slowly cracked open until airflow is what?
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noted and should be kept in that position until pressures on both sides of the valve is equalized.
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the rate of pressure rise should be kept under ____ psi per second.
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200 psi
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*moisture separators/air oilers
for service below 125 psig, either ___ or ___ may be used. |
plastic or metal bowls.
*plastic bowls shall have threaded inserts and metal guards |
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*moisture separators/air oilers
for service above 125 psig, ____ are required. |
metal bowls
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before working on or removing any part of the air compressor make sure what?
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•the compressor is electrically secure and properly tagged out
•the compressor is completely blown down and pressure is relieved •valves between the compressor and receiver are closed, including control or unloading valves •double-valve protection has been provided to isolate the depressurized area under repair |
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name the symptoms when trouble shooting a compressed air system?
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•air with excessive moisture
•insufficient air pressure or air volume |
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in a compressed air system, the heat of compression caused by a sudden high-pressure flow into an empty line or vessel can cause an ____ if oil present.
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explosion
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in a CAS, DO NOT install a stop or check valve between the compressor and receiver unless the compressor is fitted with a ____ valve
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relief valve
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