Unit School 3rd Test

Question 1

What steam is produced in E63,64,66,71 and what is it?

Answer 1

64-#40, intermediate, lpbfw
71-#40, jet lpbfw
66-#600, second stage feed hpbfw
63-#150, intermediate lpbfw

Question 2

How is jet flash controlled? Explain

Answer 2

FC144, it controls the jet bypassing E70. FC144 closed forces more jet through E70, raising the flash point

Question 3

What controls P30 suction?

Answer 3

TC147, closing it pushes more 2nd stage feed through E66, cooling it.

Question 4

What are F50 shutdowns?

Answer 4

Low burner tip pressure
Low FG header pressure
Low flow reboiler pass flows 1-8
Low convection flow
High pressure in C6250
BRPB

Question 5

What is the purpose of PC3127?

Answer 5

Provides suction pressure to 1st stage feed pump P6210

Question 6

How is pressure controlled in C6260?

Answer 6

PC140

Question 7

Where do the gases in D6231 LPS go?

Answer 7

Process gas, can be lined up to the gru

Question 8

Two sensing points for TC132 and what are they sensing?

Answer 8

The two points are the reboiler (F50) return line, and Tray 2, tray 2 is preferred

Question 9

What is the purpose of D6261?

Answer 9

The sulfur sorber, removes sulfur from the heavy heart cut feed to the CCR/Rhen. Sulfur is a catalyst poison for them

Question 10

Purpose of the FCC bleed?

Answer 10

To remove polycyclic compounds that build up in the bottom of C60, can plug the catalyst in R30

Question 11

What is the purpose of the start up circulation?

Answer 11

To keep flow through the convection section of F50 to protect the coils, where it is pressured to C60, and the circulation continues.

Question 12

What is the purpose of C6250?

Answer 12

To separate 180F and lighter material, including H2S