Podcast
Questions and Answers
Explain why it is crucial to prevent liquid ethylene from entering compressors C-120A/B, detailing the potential consequences of liquid phase process fluid?
Explain why it is crucial to prevent liquid ethylene from entering compressors C-120A/B, detailing the potential consequences of liquid phase process fluid?
Liquid ethylene can severely damage the valves and other critical components of compressors C-120A/B, potentially leading to cylinder integrity failure and loss of containment.
Describe the process by which pipeline ethylene undergoes auto-refrigeration and how E-100 (Ethylene Preheater) mitigates this effect?
Describe the process by which pipeline ethylene undergoes auto-refrigeration and how E-100 (Ethylene Preheater) mitigates this effect?
As pipeline ethylene passes through a pressure valve at battery limits, a pressure drop occurs, causing auto-refrigeration and condensation. E-100 uses 100 psig steam to heat the ethylene, reversing this effect and preventing liquid formation.
Outline the flow path of the preheated ethylene after it exits E-100 (Ethylene Preheater), specifying its next destination and what other streams combine with it along the way?
Outline the flow path of the preheated ethylene after it exits E-100 (Ethylene Preheater), specifying its next destination and what other streams combine with it along the way?
The preheated ethylene is mixed with recycle gas from D-330 (H.P. Recycle K.O. Drum) and spillback from compressors C-120A/B & C-360A/B, and then routed to D-110 (Charge Gas Compressor Suction Drum).
Explain the purpose of D-110 (Charge Gas Compressor Suction Drum) in the Feed Section, and what happens to the heavier components (C4+) that are separated within it?
Explain the purpose of D-110 (Charge Gas Compressor Suction Drum) in the Feed Section, and what happens to the heavier components (C4+) that are separated within it?
In the event of prolonged ethylene quality issues from the Chevron Pipeline, what alternative ethylene source can NAOU-1797 utilize, and why is this switch necessary?
In the event of prolonged ethylene quality issues from the Chevron Pipeline, what alternative ethylene source can NAOU-1797 utilize, and why is this switch necessary?
Flashcards
Feed Section
Feed Section
Location where heated pipeline ethylene and recycle ethylene combine, and vaporized ethylene is separated from liquids.
NAOU-1797
NAOU-1797
Receives 99.9% ethylene from Chevron Pipeline; can switch to EU-1592 in case of pipeline quality issues.
Auto Refrigeration
Auto Refrigeration
Cooling and condensing of ethylene as it passes through a pressure valve.
E-100 (Ethylene Preheater)
E-100 (Ethylene Preheater)
Signup and view all the flashcards
D-110 (Charge Gas Compressor Suction Drum)
D-110 (Charge Gas Compressor Suction Drum)
Signup and view all the flashcards
Study Notes
Feed Section Overview
- Heated pipeline ethylene and recycle ethylene combine and vaporize in the Feed Section.
- Vaporized ethylene gets separated from any liquid.
Ethylene Source
- NAOU-1797 primarily receives 99.9% ethylene from the Chevron Pipeline via the Ethylene Metering Skid.
- In case of pipeline quality issues, the feed can be switched directly from the ethylene unit EU-1592.
Ethylene Preheating
- Pipeline ethylene passes through a pressure valve upon entering, causing a pressure drop and auto refrigeration, condensing the ethylene.
- Ethylene condenses into liquid below 65°F.
- The ethylene is routed through E-100 (Ethylene Preheater) to reverse auto refrigeration using 100 psig steam to heat it and prevent liquid from entering C-120A/B (Charge Gas Compressors).
- Ethylene make-up is routed to E-750 (Regeneration Gas Cooler).
Hazard Information
- Liquid process fluid can severely damage C-120A/B valves and other components, potentially causing loss of containment.
Charge Gas Compressor Suction
- Preheated ethylene mixes with recycle gas from D-330 (H.P. Recycle K.O. Drum) and spillback from C-120A/B and C-360A/B (Booster/Recycle Compressors).
- The combined stream flows to D-110 (Charge Gas Compressor Suction Drum).
D-110 Function
- D-110 separates heavier components (C4+) from the vapor ethylene.
- C4+ components are routed to T-340 (Caustic Wash Vapor Scrubber) from the bottom of D-110.
- Ethylene vapor flows to the first stage of C-120A/B from the top of D-110.
E-100 (Ethylene Preheater)
- This is a shell and tube heat exchanger that facilitates heat exchange between two materials without direct contact.
- Heat is transferred by conduction via metal tubes.
- Shell and tube exchangers can cool products or preheat streams.
- E-100 is a multi-tube, U-tube type heat exchanger.
- It heats pipeline ethylene on the tube side using 100 psig steam on the shell side.
- The purpose of E-100 is to heat the ethylene prior to pressure letdown.
- U-tube exchangers have tubes bent in a U-shape, with both ends terminating on the same end of the exchanger.
D-110 (Charge Gas Compressor Suction Drum)
- D-110 (5’6”D x 9’L) serves both C-120A/B.
- It includes internal demister pads below the top vapor outlets to remove entrained liquids from pipeline and recycle ethylene streams.
- Pipeline and recycle ethylene streams enter the side of the drum.
- Heavier components (C4+) exit from the bottom.
- Vapor ethylene exits from the top.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
