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Crude 2 > Unit School Questions > Flashcards

Unit School Questions Flashcards

1
Q

What is the purpose of C-6105, 1st Side Cut Stripper?

A

To remove light ends from HSR using 60 psig stripping steam and return those light ends to C-6101 through the overhead vapor line

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2
Q

Why would you bypass E-6131 A/B?

A

To enable hot feed to be routed to HDS1 hydro treater to become CCR feed

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3
Q

What are the main crude feed tanks for Crude 2?

A

Tk-400, 401, 402, 403, 404, 405

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4
Q

What is the correct slow roll speed for TP-6101A?

A

Slowroll speed is 800 RPM

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5
Q

What should you do at the outside control panel to shut down TP-6101A in an emergency?

A

PULL E-STOP Button to shut down TP-6101A turbine

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6
Q

What is the purpose of the Primary Pre-Heat Train?

A

Heats raw crude feed to 260-320 degrees F, to ensure good Desalter operation and cools unit product streams

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7
Q

At what temperature do the Desalters normally operate?

A

They operate between 260 to 305 degrees F.
320 Max

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8
Q

Why is water injected at the discharge of the Main Feed Pumps (P-6101/A)?

A

Water is mixed with crude ahead of the heat exchangers to help protect them from salt deposits

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9
Q

How do we ensure the accuracy of the flow indication reading on FI-2138?

A

The reading must be corrected for the current API gravity of the incoming crude feed.

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10
Q

What is the purpose of the Flash Drum, D-6130?

A

Allows the light ends and trace water in the crude from the desalters to vaporize

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11
Q

Why is the Flash Drum, D-6130, elevated?

A

The Flash Drum is elevated to hold good suction head on the secondary crude feed pumps without increasing Flash Drum pressure.

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12
Q

At what pressure do we operate the Flash Drum, D-6130?.

A

The Flash Drum operates on Atmospheric Column Pressure

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13
Q

How do we control foaming in the Flash Drum, D-6130?

A

Foaming is controlled by a stream of hot crude recycle which maintains Flash Drum bottoms temperature above 310 degrees F.

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14
Q

What is the primary source of heat in the Secondary Pre-Heat train

A

Residuum is the primary source of Secondary Pre-Heat

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15
Q

What should you do at the outside control panel to shut down TP-6102A in an emergency?

A

Pull E-STOP Button to shut down TP-6102A Turbine in the case of an emergency

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16
Q

What is unique about the EBV installation for MP-6102 and TP-6102A?

A

The EBV’s are equipped with a Manual Override, a hydraulic hand pump used to open the valve in an emergency

17
Q

State the purpose of the Crude 2 Desalters.

A

To remove water, salts, and solids from incoming crude feed for corrosion, scale and fouling control so as to maintain heat exchanger efficiencies

18
Q

What salt is primarily removed in the Desalters?

A

Sodium Chloride

19
Q

What compound is formed in the furnace tubes if chloride salts are not removed from the feed in the Desalters?

A

Except for Sodium Chloride, chloride salts decompose into HCL in the furnace tubes

20
Q

HCL forms hydrochloric acid in C-6101 and C-6102 overhead systems by combining with what?

A

HCL combines with water (steam) in C-6101 and C-6102 to form hydrochloric acid
Hydrochloric acid corrodes C-6101 and C-6102 overhead systems

21
Q

Where is the biggest problem from Sodium Chloride noted if not removed from the crude feed?

A

Sodium Chloride, NaCl, tends to carry through to the residuum stream to become a fouling threat to downstream equipment and process units

22
Q

Describe normal Desalter operating temperature and pressure

A

Temperature: 260 – 305 Degrees F, Max 320 Degrees F
Pressure: 240 – 260 PSIG

23
Q

List the sources of Crude 2 Desalter wash water

A

D-6106 Seal Drum, 27 Plant Phenolic Water, 84 Plant, Seal Drum Condensate

24
Q

Why is wash water directed to D-6125B first?

A

D-6125B has cleanest water available for reuse because D-6125A Desalter sees dirty crude first

25
Q

How is the water and oil interface monitored in the Desalters?

A

LC-126, D-6125A
LC-1024, D-6125B
Tri-cocks

26
Q

What is Demulsifyer and what is its purpose?

A

Nalco EC2703 – a chemical surfactant that improves oil/water separation

27
Q

What are the main feed sources for C-6101?

A

1) Crude Feed from F-6101
2) Vaporized crude from the flash drum
3) Slop oil from D-6106 via D-6192 (enters flash zone)

28
Q

What are the sections of the Atmospheric Column?

A

Flash Zone
Rectifying Section (Trays 6 – 50)
Stripping Section (Trays 1-5)

29
Q

What occurs in the Flash Zone?

A

The flash zone pressure is lower than transfer line pressure. As crude feed encounters this pressure drop, light ends vaporize or flash and travel up C-6101 into the Rectifying Section. Un-vaporized feed travels down C-6101 into the Stripping Section.

30
Q

Describe column heat balance.

A

Column heat balance and heat control is obtained through the use of refluxes

Reflux is liquid hydrocarbon drawn off of a section of the column, cooled by heat exchangers, and returned to the column normally higher than the draw off tray

31
Q

What is sublimation and reverse sublimation?

A

Sublimation: solid changes to vapor without passing through a liquid stage
Dry Ice  CO2

Reverse sublimation (also known as deposition): vapor changes to solid without passing through liquid stage
CO2  Dry Ice

32
Q

Discuss C-6101 pressure control.

A

PC-109 split range controller senses C-6101 pressure
PC-109 sends signal to PC-109B, fuel gas control valve, opening valve raising column pressure to set point, at same time tells PC-109A to close
PC-109 sends signal to PC-109A on high column pressure opening valve to relief lowering column pressure, at same time tells PC-109B to close
K-6190/A normally set to pump enough overhead gases to ensure fuel gas valve, PV-109B stays open slightly and PV-109A to relief closed

33
Q

Where does the 2nd Side Cut Circulating Reflux originate? Where is the reflux stream routed?

A

Upstream of C-6106 level control valve and downstream of C-6101
Returns to C-6101 at tray 36

34
Q

Explain jet freeze and flash control variables

A

Freeze (Normally -41°C to -52°C)
Increasing draw rates results in heavier product, raising freeze point
Decreasing draw rates results in lighter product, lowering freeze point
Flash (Normally 110°F–target)
Increasing stripping steam raises flash point
Decreasing stripping steam lowers flash point
Increasing 1st Side Cut draw rates raises 2nd Side Cut flash point
Decreasing 1st Side Cut draw rates lowers 2nd Side Cut flash point

35
Q

What are the four principal destinations of the 2nd Side Cut

A
  1. Plant 18 or 22 via 68 Plant Plot Limit
  2. Plant 18 caustic treats, salt dries, and clay polishes
    -Plant 22 is a hydro treater that produces low sulfur jet and salt dries
  3. Jet to tankage via Crude 1
  4. Off Test

Crude 2 (7 decks)

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