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Questions and Answers
What is the primary function of a compressor?
The primary function of a compressor is to move vapor by increasing its pressure and reducing its volume.
How does a multi-stage compressor differ from a single-stage compressor?
A multi-stage compressor combines two or more compressors onto a single driver shaft to achieve higher pressures than a single stage can offer.
What role do suction/discharge bottles play in compressor systems?
Suction/discharge bottles, or pulsation dampeners, dampen pressure pulsations to ensure smooth operation of the compressors.
Why are C-120A/B compressors designed to run in parallel?
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What can lead to high vibration in a compressor system?
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What is the primary function of the suction/discharge bottles?
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Why is it important to monitor the temperature of the suction and discharge valves?
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How do E-120A/B charge gas interstage coolers function?
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What is the function of D-120A/B charge gas interstage K.O. drums?
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Describe how liquid and vapor exit from the D-120A/B drums.
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Study Notes
Compressor Basics
- A compressor is a mechanical device that increases the pressure and reduces the volume of vapor, moving it through piping or for storage.
- Similar to pumps, compressors are designed for vapors and come in centrifugal and positive displacement types.
Multi-Stage Compressors
- Multi-stage compressors use two or more compressor stages on a single driver shaft to achieve higher pressure outputs.
- Suction gas enters the first stage, is compressed, and then sent to a knockout (KO) drum to remove any liquid before entering the next stage.
C-120A/B (Charge Gas Compressors)
- C-120A/B are Dresser-Rand horizontally opposed compressors operating at 325 rpm and 2500 hp, designed for multi-stage positive displacement.
- Both compressors typically run in parallel for normal operations.
Suction/Discharge Bottles
- Also known as pulsation dampeners, these devices mitigate pressure pulsations during compression cycles to prevent compressor overloading and vibration issues.
- Equipped with pulsation dampeners before and after each cylinder in C-120A/B compressors for smoother operation.
- Specially designed bottles allow for one-way gas flow resembling check valves, enhancing operational efficiency.
- Monitoring valves' temperatures is crucial; high temperatures may indicate valve failures or leaks.
E-120A/B (Charge Gas Interstage Coolers)
- E-120A/B are multi-tube U-type exchangers that cool ethylene on the shell side using cooling water on the tube side, installed between the first and second stages of the compressor.
- Their primary function is to remove heat generated during compression.
D-120A/B (Charge Gas Interstage K.O. Drums)
- D-120A/B are 4’D x 8’2”L vessels equipped with internal demister pads to separate entrained liquid from ethylene after cooling.
- Ethylene enters the drum from the side, with liquids exiting at the bottom and vapor exiting from the top.
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Description
Explore the essential concepts of compressors, including their functions, types, and designs. This quiz covers both single-stage and multi-stage compressors, with a focus on specific models like the C-120A/B. Gain insights into suction/discharge bottles and their roles in maintaining pressure stability during operation.
