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Gas Dehydration- Glycol A.01

Spring Gully TEG Dehydration Package.Duty: 50 MMscfd / 10.4 usgpm TEG.

Location: Queensland, Australia (installed 2004).

IntroductionIntroductionThe use of Glycol to dehydrate gas streams is an established methodthat has proven its functionality and versatility over many years.

There are 3 common types of Glycol used for Gas Dehydration:

Mono-Ethylene Glycol (MEG)

Di-Ethylene Glycol (DEG)

Tri-Ethylene Glycol (TEG)

The type of Glycol used and the package design depends on severalfactors, and the end-users specifi c requirements and objectives forthe gas stream being processed.

Each package is typically designed in close consultation with theclient to ensure the best overall design is achieved.

Design BasisDesign BasisThe design of TEG and MEG Dehydration Systems is unique for

every requirement and the overall package design will vary to meetthe specifi ed moisture content of the gas at the process conditions.

Each system is typically designed and built as a complete turn-keypackage with particular emphasis given to the following issues:

Discharge gas moisture content High gas dehydration capacity Minimum glycol losses Minimum power consumption Optimum plant effi ciency & design integrity Compliance with HSE requirements Environmentally conscientious design

Process DescriptionProcess DescriptionIn a typical TEG package, water saturated gas enters near thebottom of the Contactor Tower and fl ows upwards through theinternal trays/packing (1). Lean Glycol enters the Contactor Towernear the top and cascades down through the Contactor internals(9), making contact with the up-fl owing gas stream. The counter-current fl ow path of the Glycol and the high contact surface areaenhances water absorption into the Glycol from the gas stream.

Rev 10/2008

Australia

Process Group Pty Ltd5 Hobbs Court, Rowville, (Melbourne), VIC 3178, Australia.

Phone: +61 3 9212 7100 Fax: +61 3 9212 7199E-mail: sales@processgroup.com.auWeb: www.processgroup.com.au

Singapore

Process Group Singapore

237 Alexandra Road, #07-09 The Alexcier, Singapore 159929

Office Phone: +65 6479 7077Office Fax: +65 6479 7177

E-Mail: sales@processgroup.com.sgWeb: www.processgroup.com.sg

Middle East

Process Group International LtdP.O. Box 46153, Abu Dhabi, UAE.

Phone: +971 2 5500 899 Fax: +971 2 5500898E-Mail: sales@processgroupintl.com

Web: www.processgroupintl.com

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Gas Dehydration- Glycol A.01

Dehydrated gas fl ows out of the top of the Contactor, whilethe Rich Glycol fl ows out of the bottom of the Contactor andto the Glycol Regeneration Package.

The TEG Regeneration process typically involves passing theRich Glycol through the still column to gain some heat (2)before entering the Flash Drum (3).

The Glycol is then passed through Particle Filters to removeparticulates and Activated Carbon Filters to remove anydissolved hydrocarbon and/or chemical compounds (4).The Rich Glycol is heated in a cross exchanger to preheatthe feed (5) to the Still Column where the Glycol present inthe water vapour leaving the Reboiler is recovered (6).

Depending on the application, it may be necessary to increasethe Lean Glycol concentration by using stripping gas (7), orrunning the Reboiler/Still Column under a slight vacuum. LeanTEG (typically >99wt%) is then cooled and pumped back tothe top of the Contactor Tower (8) to repeat the process.

A typical Glycol Dehydration Package:a number of process components are added / modified / removed to suit the requirements of each individual application

Process Group Pty Ltd, 2008.

Reference ClientsReference Clients Chevron

Shell

ENI Australia

Origin Energy Santos Australia

Cairn Energy

Bahrain Petroleum

Arrow Energy

Anzon Australia

Iranian Offshore Oil Co.

Chinese National Offshore Oil Co.

Japan-Vietnam Petroleum Co.