Hydrogen Compression Subsystem- Major equipment, How it works, Controlling, & Shutdowns

Question 1

The __________ is an air cooler that cools the lean amine from teh SRC via heat exchange with ambient air.

Answer 1

DEA Cooler for 634 E4

Question 2

The __________ increases the pressure of the cooled lean amine and transfers it to the Recycle Gas Contractor

Answer 2

Lean Amine Pump P2A

Question 3

________ is the common spare pump for Lean Amine Pumps P2A and P2C

Answer 3

Lean Amine Pump P2B

Question 4

The _________ is an air cooler that cools teh lean amine from the SRC via heat exchange with ambient air for use in 633 and 635 HDS

Answer 4

DEA Cooler for 633 and 635 E5

Question 5

The __________ increases the pressure of teh cool lean amine from DEA Cooler E5 and transfers it to 633 and 635 HDS.

Answer 5

Lean Amine Pump P2C

Question 6

The ___________ uses lean amine from the SRC to absorb H2S from the Cold Flash Drum overhead stream (recycle Hydrogen)

Answer 6

Recycle Gas Contactor (Amine Contactor) T2

Question 7

The ___________ removes any liquid entrained in the Recycle Gas Contactor overhead stream.

Answer 7

Recycle Gas Knockout Drum D4

Question 8

The ____________ cools the make-up hydrogen stream from the 633 and 635 units via heat exchange with cooling water before the hydrogen enters the Make-up Gas Knockout drum.

Answer 8

Make-up Hydrogen Cooler E58

Question 9

The ___________ removes any entrained liquid from the cooled make-up hydrogen stream.

Answer 9

Make-up gas KO Drum D6

Question 10

The ___________ compresses the combined hydrogen from the Make-up knockout drum and the recycle gas knockout Drum.

Answer 10

Hydrogen compressor C2

Question 11

The ___________ remove debris and liquid from the primary seal gas (H2) supply to the Dry Gas Seal system.

Answer 11

Seal Gas Filter/Coalescers Y11A/B

Question 12

The ___________ transfer lube oil from teh reservoir through the coolers and filters, then to the Lube Oil Rundown Tank and the Hydrogen Compressor. Additionally, they supply control oil to the compressor hydraulic coupling.

Answer 12

Lube Oil Pumps P12A/B

Question 13

The ___________ are typical shell and tube type heat exchangers that cool the circulating lube oil stream via heat exchange with cooling water. Lube oil flows through the exchanger shells and cooling water flows through the tubes.

Answer 13

Lube Oil Coolers E69A/B

Question 14

The ___________ are parallel full-flow filters that remove particulate matter, metal shavings, and debris from circulating lube oil. The debris could damage teh Hydrogen Compressor, gearbox, hydraulic coupling, or drive motor bearings.

Answer 14

Lube Oil Filters Y1A/B

Question 15

The ___________ is a horizontal vessel that receives cooled and filtered lube oil from the coolers and filters. The tank operates liquid-full and provides reserve oil capacity to maintain a constant flow of lube oil to the compressor, motor, and gearbox lubrication points if normal oil flow is interrupted.

Answer 15

Lube Oil Rundown Tank D7

Question 16

The ________ remove particulate matter and moisture from the primary seal gas (hydrogen) Supply. Debris in the seal gas could result in premature failure of the compressor seals.

Answer 16

Seal Gas Hydrogen Filters Y13A/B

Question 17

The _____________ remove particulate matter and moisture from the secondary/separation seal gas (nitrogen) supply. Debris in the seal gas could result in premature failure of the compressor seals.

Answer 17

Seal Gas Nitrogen Filters Y14A/B

Question 18

The purpose of the Hydrogen Compression Subsystem is to increase the pressure of the combined make-up and recycle hydrogen stream and remove ___________ _____________ from the recycle hydrogen stream from the Reaction Subsystem.

Answer 18

hydrogen sulfide

Question 19

What units supply make-up hydrogen to the 634 hydrogen Compression subsystem?

Answer 19

633,635, and 636 HDS

Question 20

In the Recycle Gas Contactor, ___________ ___________ is used to remove H2S from the recycle hydrogen stream.

Answer 20

Lean Amine

Question 21

The combined recycle and makeup hydrogen stream is compressed to approximately ______-psig in the Hydrogen Compressor (C2)

Answer 21

975

Question 22

The Hydrogen Compressor spare lube oil pump starts automatically if the ________ _______ _______ _______ decreases to 15-psig or the discharge pressure of the primary pump decreases to _________-psig

Answer 22

Lube oil supply header pressure, 80

Question 23

What is the purpose of the Lube oil Rundown Tank (D7)

Answer 23

The rundown tank operates liquid-full and provides reserve oil capacity to maintain a constant flow of lube oil to the compressor, motor and gearbox lubrication points if oil flow from the lube oil pump is interrupted or to allow the compressor to coast down safely in the event of a power failure.

Question 24

___________ is used as primary seal gas for the Hydrogen Compressor dry gas seals.

Answer 24

Hydrogen

Question 25

___________ is used as secondary seal gas/separation seal gas for the Hydrogen Compressor dry gas seals.

Answer 25

Nitrogen

Question 26

The Hydrogen Compressor and its motor driver are continuaously monitored for excessive vibration by a _________ _________ monitoring system.

Answer 26

Bentley Nevada monitoring system

Question 27

If the lean amine flow to the Recycle Gas Contactor is lost entirely, what could happen?

Answer 27

If amine flow is lost entirely, reverse flow of hydrogen to the SRC through the supply line could cause failure of equipment not designed for high pressure and result in fire or explosion.

Question 28

The potential effect of a high temperature of the lean amine to the Recycle Gas Contactor is decreased __________ ___________ capability of the amine resulting in a “sour” recycle hydrogen stream, which will impair the hydrogen based reactions in the HDS Reactor.

Answer 28

H2S absorption

Question 29

What happens if the level in the Recycle Gas knockout drum exceeds 70%?

Answer 29

The potential effect if this variable is not controlled is liquid to the Recycle Gas Knockout drum and possible amine carry over to the Recycle Hydrogen Compressor, which can cause compressor damage and shutdown. Uncontrolled high deviation may lead to lifting the unit PSV, which relieves to the flare, resulting in an environmental release.

Question 30

The potential effects of a low hydrogen compressor speed are insufficient hydrogen flow to the reactor resulting in less _________ __________, lower desulfurization, and an off-spec product.

Answer 30

catalyst activity

Question 31

A high motor amperage draw of ________amps will over-ride the Hydrogen Compressor (C2) performance controller and slow the compressor down to protect the compressor.

Answer 31

130

Question 32

The potential effect of high level in the Seal Gas Filter/Coalescer is _________ _________ resulting in seal damage or failure.

Answer 32

Liquid carryover

Question 33

The normal operating range for the Hydrogen Compressor Lube Oil Pumps Discharge pressure is ________ to ________-psig.

Answer 33

100-105 psig

Question 34

A high Compressor axial displacement reading of _____ mils will activate the compressor shutdown interlock.

Answer 34

32 mils

Question 35

The normal operating range for the Hydrogen Compressor primary seal gas flow is ________ to ________ SCFM.

Answer 35

40-50 SCFM

Question 36

What are the 12 process variables that will shut down the Hydrogen Compressor (C2)?

Answer 36

• High-high Make-up Knockout Drum Level (70%)
• High-high Recycle Gas Knockout Drum Level (70%)
• High-high Compressor Axial Displacement (30mils)
• High-high hydraulic coupling Axial displacement (20 mils and 32 mils, respectively)
• High-high gear axial displacement (25 mils)
• High-high Motor Winding Temperature (311 F)
• High-high Compressor Discharge Temperature (315 F)
• Low-low lube oil pressure (8-psig)
• High-high outboard Primary Seal Leakage (14SCFM)
• High-high Outboard Secondary Seal Leakage (10.7 SCFM)
• High-high Inboard Primary Seal Leakage (14 SCFM)
• High-high inboard Secondary Seal Leakage (10.7 SCFM)

Question 37

What are the 3 automatic actions that occur after the Hydrogen Compressor (C2) trip setpoint is exceeded on one of the variables?

Answer 37

• C2 electric motor is de-entergized
• C2 compressor shuts down
• DCS shutdown alarm UA27 activates

Question 38

The Recycle Gas Contactor Lean DEA Shutdown logic closes a choppervalve on the lean amine supply line if the differential pressure across the lean amine flow control valve (FV15) decreases to _______-psig

Question 39

The purpose of the Recycle Gas Contactor Lean DEA Shutdown is to prevent the backflow of hydrogen from the contactor to the ___________

Answer 39

SRC via the lean amine supply line in the event that the supply is lost.