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Questions and Answers
What happens to ethylene as it crosses the pressure valve?
It experiences a pressure drop, causing auto refrigeration and cooling/condensing.
What unit primarily receives ethylene from the Chevron Pipeline System?
The Normal Alpha Olefins Unit 1797 (NAOU-1797) receives ethylene.
What is the risk associated with sending liquid ethylene to C-120A/B?
It could cause severe damage to the valves and threaten cylinder integrity.
At what temperature does ethylene begin to condense into liquid?
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What role does E-100 play in the ethylene process?
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What components are mixed with the preheated ethylene before routing to D-110?
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What is the primary concern during pipeline upsets related to ethylene quality?
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Where are the heavier components (C4+) routed after separation from vapor ethylene?
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What temperature and pressure conditions are maintained in E-100 during the heating process?
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What may happen if liquid ethylene enters the Charge Gas Compressors?
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Study Notes
Ethylene Processing in NAOU-1797
- Ethylene production starts with the combination of heated pipeline ethylene and recycle ethylene, with separation of vapor ethylene from heavier liquid components (C4+).
- NAOU-1797 primarily receives ethylene from the Chevron Pipeline System via the Houston Pipeline Leg through an external metering skid.
- In pipeline upsets causing prolonged ethylene quality issues, personnel can redirect ethylene feed from EU-1592 to ensure quality control.
Pipeline Operations and Temperature Control
- Ethylene experiences a pressure drop at the battery limits due to a pressure valve, leading to auto refrigeration, which cools and condenses ethylene when temperatures fall below 65°F.
- To prevent sending liquid ethylene into C-120A/B (Charge Gas Compressors), ethylene is heated using 100 psig steam in E-100 (Ethylene Preheater), reversing prior cooling effects.
Risks of Liquid Phase Processing
- Liquid ethylene or phase fluid poses a significant risk of damaging valves and critical components in C-120A/B, risking cylinder integrity and potential loss of containment.
Subsequent Processing Steps
- Preheated ethylene is combined 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).
- This mixture is then directed to D-110 (Charge Gas Compressor Suction Drum).
- Heavier components (C4+) are separated from vapor ethylene in D-110 and routed to T-340 (Caustic Wash Vapor Scrubber) for further processing.
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Description
This quiz explores the ethylene processing operations at NAOU-1797, focusing on production methods, pipeline operations, and temperature control. Understand the importance of quality control during pipeline upsets and the risks associated with liquid phase processing. Test your knowledge about specific equipment and operational practices.
