turbo expander training

7/27/2019 Turbo expander training

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Atlas Copco Group Presentation 20131

TURBOEXPANDERS

Section V: Turboexpander Start-up and Operations


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Turboexpander Training

Committed to Customer Value

Atlas Copco Mafi-Trench Company LLC


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Innovative Solutions

Products Services

Knowledge


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Section V:

Turboexpander Start-up And Operations


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Gas Processing

Is it safe?


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Gas processing is notinherently dangerous,

but more so than sky-diving, it is unforgiving

of mistakes!



To prevent accidents, we

have to remember only

one word; thats



Safety SAFETY safety

Safety

Safety SAFETY Safety

SAFETY



So, what is a Turboexpander ?



Its a machine used to produce refrigeration

and recover otherwise wasted energy...



An expander acting as a J.T.

It functions as a differential

pressure control valve

100% of

Flow

@ -24F @ -110 F

737 psig 218 psig



An expander acting as a J.T.

100% of

Flow

@ -24 F @ -110 F

737 psig 218 psig

And recovers 6,003 Hp @ 16,500 RPM



Single Turboexpander Process Train

LPG Absorber

Cold Separator



Starting your MTC

Turboexpander System



A typical representationof a MTC

Turboexpander System



1. Purge housings and related pipingfollowing plant protocol

2. Pressurize machine housings out to

the related block valves using seal gas



5o psig/Per Min.

50 psi-Delta



3.5 Bar/Per Min.

3.5 Bar-Delta



218 psig

218 psig

218 psig

Target housing pressures:



Proceed to Start-up:


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Process Train Stable on J.T. Valve

Blocked In

To Re-compressor

X X X

X

X Low pressureseparator

Cold Separator


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Blocked In

To Re-compressor

X X X

X

X

Expander ESDV and all manual

block valves verified closed...

Cold Separator

Low pressure

separator


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Block in

Seal Gas PDCV


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Use seal gas PDCV by-pass to pressurize all

housings and piping outto the block valves...


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DO NOT EXCEED A RATE OF

50 psig per minute!

Do not exceed adifferentialof

50 psi (Delta-P)

across themachine!


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Monitor all housings as pressure builds...


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When compressorhousing pressure equals

compressor suctionpressure, open that

block valve...


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Blocked In

To Re-compressor

X X X

O

X

Open compressor suction

block valve...

Cold Separator

Low pressure

separator


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When expanderhousing pressure equals

expander discharge,open that block valve...


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Blocked In

To Re-compressor

X O X

X

X

Open expander discharge manual

block valve...

Cold Separator

Low pressure

separator


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Close Seal GasRegulator By-pass;

confirm seal gas

ALARM is cleared.


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Start lube oil system:1. Open regulator bypass

2. Pump A in MANUAL3. Pump B (stand-by) in AUTO

4. Slowly close bypass: confirm ALARM clears

5. Reset pump B to OFF, then to AUTO


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Atlas Copco Group Presentation 201339 Drain Housings


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Atlas Copco Group Presentation 201340Compressor Drains


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Expander Casing

Drains...

O d ti bl k l


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To Re-compressor

OO O

O

X

Open expander suction block valve;

Expander ESDV remains closed...

LPG Absorber

Cold Separator


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In coordination withControl Room Personnel,

start Turboexpander bypressing START at

expander control screen...

E d i l t ESDV h ft


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To Re-compressor

O O O

O

O

Expander inlet ESDV opens; shaft

begins to rotate...

Cold Separator


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Turboexpander/Compressor Operation

Independent DCS control of

J-T valve

Expander Inlet GuideVanes

TRIP

Expander Quick Closing Valve


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As IGVs open, J.T. Valvewill close. As J.T. closes,

switch DCS IGV

controller to Remote

16 500 RP

M


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16,500 RPM

-110 F

300 psig

One-to-two hours to stabilize


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What is Surge?


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Surge is a disturbance

in the flow into, through,or out of the

compressor...


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Surge controller should be

set to Automatic.

C fi S C i


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Surge ControlSystem

Confirm Surge Controller is set to

AUTOMATIC


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Turboexpanders produce really cold gas...


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Monitor:

1. Seal Gas Pressure Diff.

2. Lube oil Pressure Diff.3. Vibration Levels

4. Bearing Temperatures


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Reliability / Maintenance

Condition monitoring requires:

Knowledge of parameters to be monitored

Appropriate redundancy

Trending of acquired data

Adequate spare parts

Pre-planning for corrective actions


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Safety, Safety, Safety!


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Turboexpander Training

First in MindFirst in Choice

Atlas Copco has a clear vision


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We are committed to your

superior productivity through

interaction and innovation.


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turbo expander training

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