630 Unit Emergency Shutdown

Question 1

1.1 IMMEDIATE ACTIONS

CCR/Oper 1.1.1 - CONTINUE sweeping the unit with H2 If the emergency allows the compressors to run. IF not, SHUTDOWN the compressor servicing 630 unit.

Answer 1

CCR 1.1.2 - NOTIFY Heavy HDS Console Operator to divert 633 Overhead liquids away from 630 Unit.

Question 2

CCR 1.1.3 - DIVERT feed going to 630 unit, by performing the following steps at plot limits:

Answer 2

CCR A- NOTIFY Oil movements that 630 unit will be bypassed, and product needs to be diverted to off test tank.

Oper B- OPEN the Feed to Product manual BYPASS valve located at the plot edge.

Oper C- CLOSE 6” feed inlet valve at plot edge.

Question 3

Oper 1.1.4 - ISOLATE 630 unit from 631 using 60FV0011 Hydrogen regulator if 631 unit can safely run. IF hot sweep is possible on 630 unit, the N/A this step.

Answer 3

CCR 1.1.5 - ENGAGE the Hydrocarbon Feed bypass on 60HS0002A DCS & 60HC5114 SIS. (If emergency allows for a Hot Hydrogen Sweep. If not, omit this step and continue to next step.)

Question 4

Oper 1.1.6 - REMOVE 630P0005A/B, Fresh Feed Pump from service.

Answer 4

CCR/Oper 1.1.7 - CLOSE 60FC0001, Feed control valve and ENSURE bypass valve is closed.

Question 5

CCR/Oper 1.1.8 - CLOSE 60FC0096, Minimum Flow Control valve and ENSURE bypass valve is closed.

Answer 5

CCR/Oper 1.1.9 - CLOSE 60LV0001, Rx Effluednt Flash Drum Bottoms Release valve, and ENSURE bypass valve is closed.

Question 6

CCR 1.1.10 - CLOSE 60FC0004 steam to the 630E0004 1st stage Stripper feed preheater.

Answer 6

Oper 1.1.11 - BLOCK IN 630E0101 2nd stage Stripper Feed Preheater condensate release to 630D0015

Oper 1.1.12 Remove 630 P0003/3A, Stripper Bottoms Pump from service.

Question 7

CCR/Oper 1.1.13 - CLOSE 60LC0006A, Stripper Bottoms Release Level Control valve, and ENSURE bypass valve is closed.

Answer 7

CCR 1.1.14 - LOWER 60FC2003, Stripping Nitrogen Flow Controller set point to ~5 MSCFH

Question 8

Oper 1.1.15 - REMOVE 630P0002, Stripper Overhead Pump from service.

Answer 8

CCR/Oper 1.1.16 - CLOSE 60LC004, Stripper Overhead Receiver Level Control valve and ENSURE bypass valve is closed.

Question 9

Oper 1.1.17 - REMOVE 630P0102, Dryer Bottoms Pump from service.

Answer 9

CCR/Oper 1.1.18 - CLOSE 60LC0024 630 Dryer Level Control valve, and ENSURE bypass valve is closed.

Question 10

1.2 SUPPLEMENTAL ACTIONS

Answer 10

Oper 1.2.1 - BLOCK IN one side of 60FV0001, Feed control valve.

Oper 1.2.2 - BLOCK IN one side of 60FC0096, Min Flow Control valve.

Question 11

Oper 1.2.3 - CLOSE 630D0005, Feed Surge Drum inlet isolation valve.

Oper 1.2.4 - BLOCK IN one side of 60LV0001, Rx Effluent Flash Drum Bottoms Release valve.

Answer 11

Oper 1.2.5 - BLOCK IN one side of 60LC0006A, Stripper Bottoms Release Level Control valve.

Oper 1.2.6 - BLOCK IN one side of 60LC0004, Stripper Overhead Receiver Level Control valve.

Question 12

Oper 1.2.7 - BLOCK IN one side of 60LC0024 630 Dryer Level Control valve.

Answer 12

CCR 1.2.8 - MAINTAIN Coil Outlet Temperature @ ~395 °F or as directed by Supervision, to prevent catalyst stripping.

THIS IS THE END OF THE PROCEDURE