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Questions and Answers
Explain the purpose of injecting nitrogen into both T-431 and D-431 in the C24-C28 production process. What specific function does it serve in each vessel?
Explain the purpose of injecting nitrogen into both T-431 and D-431 in the C24-C28 production process. What specific function does it serve in each vessel?
In both vessels, nitrogen is used to strip water from the C24-C28 product. In T-431 it counter-currently strips water from in the liquid stream. In D-431, it removes any remaining water before the product is sent to storage.
Describe the flow path of the C24-C28 product from the side draw of T-430 to its final storage in TK-39/TK-40, naming each piece of equipment it passes through and its purpose.
Describe the flow path of the C24-C28 product from the side draw of T-430 to its final storage in TK-39/TK-40, naming each piece of equipment it passes through and its purpose.
C24-C28 flows from T-430 to T-431, a stripper, then to D-431, an accumulator. Next it goes to P-431A/B, pumps, then E-432, a cooler, then F-431, a filter before final storage in TK-39/TK-40.
If the boiler feed water flow to E-432 were suddenly reduced, what would be the immediate impact on the C24-C28 product and the 15 psig steam header, and why?
If the boiler feed water flow to E-432 were suddenly reduced, what would be the immediate impact on the C24-C28 product and the 15 psig steam header, and why?
The C24-C28 product would not be cooled as effectively, increasing its temperature. Less steam would be generated in E-432, reducing the pressure of the 15 psig steam header.
What is the main objective of T-431, and how does its design (packed bed, nitrogen flow) contribute to achieving this objective?
What is the main objective of T-431, and how does its design (packed bed, nitrogen flow) contribute to achieving this objective?
Explain why P-431A/B are specified as centrifugal pumps and what implications this has for their operation and maintenance compared to, for example, positive displacement pumps.
Explain why P-431A/B are specified as centrifugal pumps and what implications this has for their operation and maintenance compared to, for example, positive displacement pumps.
Flashcards
T-431 (C24-C28 Stripper) function.
T-431 (C24-C28 Stripper) function.
Removes water from the C24-C28 liquid stream using nitrogen as a stripping gas.
D-431 (C24-C28 Accumulator) function
D-431 (C24-C28 Accumulator) function
Receives the C24-C28 product from the stripper before it goes to storage.
P-431A/B (C24-C28 Pumps) function
P-431A/B (C24-C28 Pumps) function
Move the C24-C28 product from accumulator to storage.
E-432 (C24-C28 Cooler) Function
E-432 (C24-C28 Cooler) Function
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T-431 Control Objective
T-431 Control Objective
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Study Notes
- C24-C28 feed from T-430 is routed to T-431 and separated into overhead vapor (nitrogen and steam condensate) and bottom liquid (C24-C28 product) streams.
- The liquid stream flows down a 12-foot packed bed in T-431 while nitrogen flows upward, stripping the product and any entrained water.
- Nitrogen and stripped water from T-431 return to T-430 below the middle packed bed.
- T-431's bottom liquid stream goes to D-431 (C24-C28 Product Accumulator).
- Nitrogen is injected into D-431 to strip remaining water from the C24-C28 product, with the overhead vapor returning to T-431.
- Liquid from D-431 flows through E-432 (C24-C28 Product Cooler) via P-431A/B (C24-C28 Product Pumps), cooled by boiler feed water.
- Steam from the cooler's shell side goes to the 15 psig Steam Header.
- Cooled liquid is routed to F-431 (C24-C28 Product Filter).
- C24-C28 product is then routed to TK-39/TK-40 (C24-C28 Product Tanks).
- Off-spec product can be sent to TK-800 or Slop.
- T-431, D-431, P-431A/B, E-432, and F-431 are described in detail, including size, shape, internals, and special features.
T-431 (C24-C28 Stripper)
- It measures 2’D x 20’7”L.
- It exists to strip water contaminants from the C24-C28 liquid stream.
- The key process control objective is to strip water.
- C24-C28 enters the side, nitrogen and water exit the top, and C24-C28 exits the bottom.
D-431 (C24-C28 Product Accumulator)
- It measures 4’D x 6’L.
- It accumulates C24-C28 product for routing to storage.
P-431A/B (C24-C28 Product Pumps)
- They are single-stage centrifugal pumps driven by 25 HP 3550 RPM horizontally-mounted, induction electric motors.
- They route the C24-C28 product to storage.
E-432 (C24-C28 Product Cooler)
- It is a shell and tube exchanger.
- It cools the C24-C28 product on the tube side with untreated boiler feed water on the shell side.
- It cools the C24-C28 product before storage.
F-431 (C24-C28 Product Filter)
- It is a cartridge type filter
- It removes molecular sieve fines from the C24-C28 product before storage.
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