Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Compressor shut Down
- Thread starter lucas2008
- Start date
Are you paying for your internet service by the word? That kind of abreviated talk is simply annoying and you should ask yourself "what about my question would get a very highly paid compressor engineer to provide an answer for free?". You have to ask interesting questions to get worthwhile answers.
What is your question? Can low suction pressure result in overspeed? Yes in certain piping configurations. Can overspeed result in a low suction kill? Yes in certain compressor configurations.
David
What is your question? Can low suction pressure result in overspeed? Yes in certain piping configurations. Can overspeed result in a low suction kill? Yes in certain compressor configurations.
David
- Thread starter
- #3
Sorry, I speak spanish and I can hardly speak english . But I will try to explain you.
On reciprocant compressors,where the type contol capacity is manual variation speed. i.e. the capacity is controled by operator, he actuates the fuel- admission valve on the compressor driver to control speed.
If a reciprocant compressor is running and occur a shut down in the suction line pipe, consecuently falls the rate in the suction compressor.
can overspeed result on this situation?
Thanks best regads
Lucas
On reciprocant compressors,where the type contol capacity is manual variation speed. i.e. the capacity is controled by operator, he actuates the fuel- admission valve on the compressor driver to control speed.
If a reciprocant compressor is running and occur a shut down in the suction line pipe, consecuently falls the rate in the suction compressor.
can overspeed result on this situation?
Thanks best regads
Lucas
Yes.
Remember that the power needed by the compressor is in proportion to the cube of the mass flow.
Cut off your suction, the mass flow drops and so does the power needed.
Meanwhile, the driving engine is set up match the prior power demand of the compressor. When the compressor load goes away, the engine still wants to produce the same power. Since there is no load to absorb torque, the engine will speed up to attempt to maintain the same power output.
Imagine driving your car up a steep hill and suddenly depressing the clutch pedal without taking your foot off the gas.
Remember that the power needed by the compressor is in proportion to the cube of the mass flow.
Cut off your suction, the mass flow drops and so does the power needed.
Meanwhile, the driving engine is set up match the prior power demand of the compressor. When the compressor load goes away, the engine still wants to produce the same power. Since there is no load to absorb torque, the engine will speed up to attempt to maintain the same power output.
Imagine driving your car up a steep hill and suddenly depressing the clutch pedal without taking your foot off the gas.
- Status
Similar threads
- Question
- Locked
- Question