Module 4- Gas Compression Operation Flashcards
If you observed a high temperature discharge on a compressor, what 4 possible causes would there be?
- Aerial cooler problem
- Inadequate lubrication
- High Engine Speed
- Worn, broken or dirty valves
If you observed a high second stage suction temperature, what would the 3 possible causes be?
- Aerial cooler problem
- High intercooler pressure
- High discharge pressure
If you observed high oil temperature on a compressor, what would the 5 possible causes be?
- Low coolant injection
- Dirty water jackets
- Aerial cooler problem
- Incorrect oil for application
- High discharge temperature
If you observed low discharge pressure on a compressor what would the 5 possible causes be?
- Low suction pressure
- System leakage
- Low engine speed
- Worn piston rings
- Low receipt point pressure
If you observed high discharge pressure on compressor, what would the 3 possible causes be?
- Restrictions in gas processing unit
- High line pressure at receipt point
- High engine speed
If you observed a high oil consumption on a compressor, what would the 3 possible causes be?
- oil leaks at gaskets, seals or fittings
- High oil circulation rate
- Oil level too high
If you observed vibration on a compressor, what would the 5 possible causes be?
- Loose or damaged mountings
- Loose or damaged pipe supports
- incorrect engine speed
- high discharge pressure
- couplings misalignments
In oilfields operations, how much is gas compressed? what result does that have on temperature?
Gas is often compressed to one-tenth of its origin volume.
This results in corresponding increase in temperature.
What does the ideal gas law state about gas reduction and temperature?
Reduction in volume of a given mass = increase in the temperature of the gas.
How is heat generation from compression controlled in the oilfield?
compression and cooling between stages
what kind of compression enables more efficient cooling between stages?
multistage
why is after cooling done?
to reduce the gas volume shrinkage caused by cooling in the transmission lines, thus increasing efficiency of the transmission pipeline.
What are aerial coolers designed for?
to reject a tremendous amount of heat from the gas in a very short time.
What is gas from a final compression stage passed through before it is passed through the sales meters and onto transmission companies?
aerial coolers
What happens as the compressor pistons move forward to compress gas?
differential pressure acting on the piston results in a gas force pushing against the piston, and causing a compressional force on the piston rod.
What happens as the compressor move forward to compress gas in a double acting piston?
the compressional force is balanced by the suction action of the back end of the piston as it draws gas in to be compressed.
Where is the piston when the maximum compression force occurs?
at its maximum forward travel just before the gas discharge from the top end of the piston.
How are reciprocating compressors usually rated?
In terms of horsepower, speed and road load.
Define gas loads/inertial forces?
The forces that act simultaneously on a reciprocating compressor during one revolution of the crankshaft include piston rods loads, connecting road loads, crosshead pin loads, crank pin loads, and the frame load.
What is volumetric efficiency?
the actual pumping capacity of the cylinder compared to the piston displacement of swept volume.
