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Petroleum & Gas Inspectorate | Alert | No.103 V 1 | 03 June 2022

Over pressure event in a TEG reboiler column causing a significant fall from height

What happened?

A triethylene glycol (TEG) reboiler termination cap (cap) discharged under pressure from the reboiler column due to an over pressure event which occurred whilst workers were switching between pumps. No persons were injured, however the approximately 10kg cap landed in an area of the plant where workers could have been standing.

How did it happen?

Methane gas backflowed from the TEG contactor to the TEG reboiler during manual switching of the glycol pumps.

Key issues

Critical controls

There were no critical controls in place to prevent the cap from being released and falling to the ground.
Investigations are continuing in relation to failed critical controls to prevent the over pressure event within the TEG reboiler column reoccurring.


Facilities operating similar plant and equipment should assess the likelihood and consequence of a related over pressure event occurring.

Where potential risks are identified, existing controls should be assessed to ensure risks to workers are kept at the required level of as low as is reasonably practicable.

Investigations are ongoing and further information may be published as it becomes available. The information in this publication is what is known at the time of writing.

We issue Safety Notices to draw attention to the occurrence of a serious incident, raise awareness of risks, and prompt assessment of your existing controls.

Authorised by Radika Lucas - Deputy Chief Inspector – Petroleum & Gas

Contact: Tony Willis, Manager Investigations , +61 7 5459 6191

Issued by Resources Safety & Health Queensland

Safety: This information is issued to promote safety through experience. It is not to be taken as a statement of law and must not be construed to waive or modify any legal obligation.

All information on this page (Over pressure event in a TEG reboiler column causing a significant fall from height - is correct as of time of printing (8 July 2022 3:32 am).