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Questions and Answers
Explain the purpose of the nitrogen blanket in TK-800 and why it's important for maintaining product integrity.
Explain the purpose of the nitrogen blanket in TK-800 and why it's important for maintaining product integrity.
The nitrogen blanket in TK-800 is used to minimize vapor generation and prevent contact with moisture and oxygen. This is important for maintaining product integrity by preventing contamination and degradation of the stored C6+.
Describe the function of the internal floating roof with a vacuum breaker in TK-800 and what triggers the vacuum breaker to open.
Describe the function of the internal floating roof with a vacuum breaker in TK-800 and what triggers the vacuum breaker to open.
The internal floating roof minimizes vapor emissions by eliminating the vapor space. The vacuum breaker opens when the roof gets too low to prevent damage as the tank is emptied.
Explain how TK-800 is used to maintain fractionation section operation during a feed upset, such as a short-duration shutdown of R-201/205.
Explain how TK-800 is used to maintain fractionation section operation during a feed upset, such as a short-duration shutdown of R-201/205.
TK-800 acts as a storage buffer, holding up to two days of C6+ feed. If the feed supply is disrupted, P-800 A/B pumps route the stored feed from TK-800 to T-400, ensuring continuous operation of the Fractionation Section.
What are the functions of the mixer (M-800) and heaters (E-800A/B/C) inside TK-800, and why are they important for the storage and handling of C6+?
What are the functions of the mixer (M-800) and heaters (E-800A/B/C) inside TK-800, and why are they important for the storage and handling of C6+?
Considering the various feed sources to TK-800 explain why this tank is separated from the tank farm vent system?
Considering the various feed sources to TK-800 explain why this tank is separated from the tank farm vent system?
Flashcards
TK-800 Function
TK-800 Function
Provides two days of storage to maintain feed to the Fractionation Section during feed upsets.
TK-800 Feed Sources
TK-800 Feed Sources
D-801, T-470, T-431, T-430, Unit 1791, T-380.
P-800A/B Function
P-800A/B Function
They route feed from TK-800 to T-400 when the Fractionation Section needs a feed supply.
Nitrogen Blanket Purpose
Nitrogen Blanket Purpose
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TK-800 Tank Type
TK-800 Tank Type
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Study Notes
- TK-800 provides two days of storage for maintaining feed rate and Fractionation Section operation during feed upsets like short shutdowns of R-201-205.
- It receives feed from the bottom of D-801, off-spec C20-C24 from T-470, off-spec C24-C28 from T-431, off-spec C30+ from T-430, C6+ from Unit 1791, and the bottom of T-380 (after cooling in E-388).
- P-800A/B pumps route feed from TK-800 to T-400 when the Fractionation Section needs a feed supply.
- TK-800 includes an internal mixer (M-800) and heaters (E-800A/B/C) using 60 psig steam.
- The tank is maintained under a nitrogen blanket and is separated from the tank farm vent system to maintain product integrity.
TK-800 (C6+ Storage Tank)
- It's an internal floating roof tank which means it has a cylindrical tank with a fixed, cone-shaped roof permanently attached to the shell.
- Inside the tank is a floating roof which is not permanently attached and floats on the process material.
- Rainwater is shed from the cone roof.
- The internal floating roof reduces emissions by eliminating vapor space.
- TK-800's dimensions are 40’D x 48’L.
- It includes an internal floating roof with a vacuum breaker that opens when the roof reaches 7’2” above the floor.
- A nitrogen blanket minimizes vapor generation and contact with moisture/oxygen.
- A 4” foam maker nozzle allows water and foam to be connected in case of fire within the vapor space above the floating roof.
- It is separated from the tank farm vent system with 6” spectacle-blinds rolled to the closed position at the vent header inlet.
- Feed enters and exits the tank from the side bottom.
M-800 (C6+ Storage Tank Mixer)
- It is installed internally to prevent settling/layering of sludge and to maintain a homogeneous blend of hydrocarbons.
- The mixer is driven by a 3HP 6580 GPM induction electric motor.
E-800A/B/C (C6+ Storage Tank Heaters)
- These are internal heaters that maintain temperature using 60 psig steam.
P-800A/B (C6+ Storage Tank Pumps)
- These are single-stage centrifugal pumps driven by 40 HP 3550 RPM horizontally-mounted, induction electric motors.
- They route C6+ feed from TK-800 to T-400.
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