Safety Systems

Question 1

Prevents A-Oxy Reactor and both hydrogen feed systems from operating when there is a communications failure between the CPU and the outside controllers.

Answer 1

FCS302 (Field Control Station-302) FAILURE

Question 2

Prevents B & C-Oxy Reactors from operating when there is a communications failure between the CPU and the outside controllers.

Answer 2

FCS303 (Field Control Station-303) FAILURE

Question 3

Shutdown A/B/C-Oxy reactor by isolating the feeds. The Recycle Gas Compressor will remain in operation to keep the catalyst bed fluidized.

Answer 3

200-A/B/C OXY SHUTDOWN SWITCH

Question 4

Prevents catalyst from plugging cups and damaging feed distribution system when a Recycle Gas Compressor trips. Slumping of the catalyst bed can cause distributor plate and sparger damage during a Recycle Gas Compressor trip.

Answer 4

RECYCLE GAS COMPRESSOR (MCM-201 or 202 or 203) STOP:
Interlock is hardwired and activated when the compressors are stopped.

Question 5

Prevents catalyst from plugging cups and damaging feed distribution system when a Recycle Gas Compressor trips. Slumping of the catalyst bed can cause distributor plate and sparger damage during a Recycle Gas Compressor trip.

Answer 5

RECYCLE GAS COMPRESSOR (MCM-201 or 202 or 203) STOP:
Interlock is hardwired and activated when the compressors are stopped.

Question 6

Prevents the Oxy Reactor from operating with an Oxygen enriched atmosphere. Interlock is DCS activated when 2 of 3 Oxygen analyzers indicate 7 % Oxygen in the Recycle Gas stream

Answer 6

RECYCLE GAS HHH OXYGEN ANALYZER (A24 A/B/C-1/2/3):

Question 7

Prevents the Reactor from operating with an Oxygen enriched atmosphere. Interlock is DCS activated when 2 of 3 Oxygen analyzers indicate 10% Oxygen in the Recycle Gas stream.

Answer 7

RECYCLE GAS HHHH OXYGEN (A24 A/B/C-1/2/3)

Question 8

Interlock is DCS activated when HCI flow is less than 1400 scfm for greater than five seconds. Prevents Reactor Startup when the HCl flow may be too low to prevent uncontrolled Ethylene, Oxygen reaction within the Reactor.

Answer 8

HCl LLLL FLOW (F201 A/B/C AND F201 A/B/C-1)

Question 9

Interlock is DCS activated when HCI flow is less than 2100 sofm for greater than five seconds. Prevents Reactor from operating when the HCI flow is less than intended design.

Answer 9

HI LLL FLOW (F201 A/B/C AND F201 A/B/C-1)

Question 10

Interlock is DCS activated when the Ethylene flow is less than 950 scfm for greater than five seconds. Prevents Reactor from operating with excessive HCI resulting in inefficient
Reactor operations due to loss of catalyst fluidization.

Answer 10

ETHYLENE LLL FLOW (F202 A/B/C)

Question 11

Interlock is DCS activated when the Oxygen flow is less than 480 scfm for greater than five seconds. Prevents Reactor from operating with excessive HCI resulting in inefficient
Reactor operations due to loss of catalyst fluidization.

Answer 11

OXYGEN LLL FLOW F204 A/B)

Question 12

Interlock is
DCS activated when Recycle Gas becomes less than 4000 scfm for greater than five seconds. Prevents the Reactor from operating with insufficient catalyst bed fluidization resulting in possible catalyst plugging of cups and damaging of feed distribution system. Slumping of the catalyst bed can cause distributor plate and sparger damage during a Recycle Gas Compressor trip.

Answer 12

RECYCLE GAS LLL FLOW F206 A/B/C AND F206 A/B/C-1)

Question 13

Interlock is DCS activated when level reaches 20 %. Prevents liquid carryover to the Recycle Gas Compressors (MCM-201/202/203). Compressors are designed to compress gas, not liquid. Liquid entering the compressor can cause severe damage.

Answer 13

MTK-211 or 212 or 213 HHH LEVEL (L273A or L273B or L273C

Question 14

Interlock is DCS activated when Ethylene supply pressure increases to 150 psig. Prevents Reactor from operating with excessive Ethylene concentration resulting in a fuel rich atmosphere

Answer 14

ETHYLENE HEADER HHH PRESSURE (P202)

Question 15

Interlock is DCS activated when Ethylene supply pressure reaches 150 pig. Prevents Reactor from operating with excessive Ethylene concentration resulting in a fuel rich atmosphere

Answer 15

ETHYLENE HEADER HHH PRESSURE (P220)

Question 16

Interlock is DCS activated when 2 of 3 temperatures reach 260° C. Prevents Reactor from operating at a temperature that will result in catalyst degradation and possible equipment damage due to high temperature.

Answer 16

T212 A/B/C-9, 10, 11 HHH TEMPERATURE

Question 17

Interlock is DCS activated when 2 of 3 temperatures reach 214° C. Prevents Reactor from operating at a temperature which will result in catalyst stickiness and inefficient Reactor operations.

Answer 17

T212 A/B/C-9, 10, 11 LLL TEMPERATURE

Question 18

Interlock is DCS activated when 2 of 3 temperatures are less than 185° C. Prevents feeds from being introduced into Reactors when the temperature is too low to support combustion.

Answer 18

T212 A/B/C-9, 10, 11 LLLL TEMPERATURE

Question 19

Interlock is DCS activated when T353 reaches (-) 13° C AND T357-7 reaches (-) 8° C. Prevent VCM from being fed to the Oxy Reactors resulting in a fuel rich atmosphere.

Answer 19

T353, T357-7 HHH TEMPERATURE on TRAY # 48 of the HCI Column

Question 20

Interlock is DCS activated when the cooling water flow to the Oxy Reactor falls below 180 KB/HR. Ensures that enough cooling water flow is available for safe operation of Oxy Reactor.

Answer 20

REACTOR COOLANT LLL FLOW (F211A/B/C-1/2)