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Meeting Coal Seam Gas Safety Compliance

Safety compliance is critical to help ensure incident free oil and gas production. A fault-tolerant safety instrumented system can help meet compliance requirements

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Challenge

  • To implement a modern safety system to help meet oil and gas compliance requirements

Solutions

  • Advanced Safety System - The AADvance® fault tolerant control system provides a fully independent shutdown path to the gas generator units, isolation of fuel gas valves and associated electrical systems
  • Factory Acceptance Testing - Detailed Factory Acceptance Testing (FAT) was conducted helping to make the commissioning process seamless

Results

  • Fire and Gas Safety Compliance - The new system is now compliant with IEC 61511 SIL2 design Fire and Gas Safety Instrument System regulations
  • The system meets the strict guidelines of OLF, the Norwegian Oil Industry Association

Coal Seam Gas (CSG) is a naturally occurring methane gas found in most coal seams and is similar to conventional natural gas. CSG is extracted from deep below the ground using world-best practice techniques that protect the community and our environment.

Australia's major coal seam gas resources are found onshore in eastern Australia. Currently the largest known proven reserves are in Queensland's Bowen and Surat basins. Natural gas from coal seams form part of the gas supply used by industry and households for heating and cooking.

The Australian coal seam gas industry has earned a reputation as a highly regulated industry with best-practice technologies to protect land and water resources.

In keeping with this, a global energy company recently upgraded their generator safety systems with the latest control and safety technologies to meet stringent compliance requirements.

Reducing safety risks

Coal seam gas wells release gas through groundwater extraction. The extracted water and gas is diverted to the surface where the water is separated from the gas. The coal seam gas water has a high concentration of salt, it is collected and transferred via pipelines to storage ponds.

The water is then pumped to water treatment plants where it is further treated prior to being used for agriculture, municipal or industrial applications. The coal seam gas water treatment plant is powered by gas engine generators using methane from the gas fields.

Meeting global safety standards for fire and gas is a key priority for the energy company. As such, they called on PSA Engineering, a Process Safety Partner in the Rockwell Automation PartnerNetwork™ program, to upgrade the emergency shutdown and fire and gas system, across their seven generators. Based in Ormeau, Queensland, PSA Engineering provides a wide range of specialist engineering services for both control and safety instrumented systems across a variety of industrial sectors.

“With a treatment capacity of more than 90,000 cubic meters per day, reducing safety risks was a critical consideration for the water treatment plant. The key driver for the project was to replace a non-compliant SIL2 fire and gas system with one that complied,” said John Teahan, lead I+E engineer at PSA Engineering responsible for the delivery of a fully compliant OLF-070 SIL 2 F+G Safety Instrumented System.

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With a treatment capacity of more than 90,000 cubic meters per day, reducing safety risks was a critical consideration for the water treatment plant.

Advanced Safety System

Each of the seven gas generators onsite is housed within an individual enclosure with multiple SIL 2 certified fire and gas sensors to monitor for fire and, or gas events. Sensors operate in 1oo2 voter mode with provision for online sensor testing and fault tolerance provided where 1oo2 degrades to 1oo1. Complete spectrum of sensor diagnostics is designed into AADvance® application with direct reporting to the operator via the OPC interfaced SCADA system.

The system features a series of SIL 2 certified beacons to alert personnel within the generator enclosure and immediate area plus a siren to warn personnel of a potential fire and, or gas event.

The AADvance fault tolerant control system from Rockwell Automation was selected as the most appropriate solution for this application, due to its safety capabilities and value proposition. It is a Safety Instrumented System that provides flexible controller redundancy and could be engineered to integrate with existing systems at the plant.

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In a fire or gas event, the AADvance system provides a fully independent shutdown path to the gas generator units, isolation of fuel gas valves and associated electrical systems.

If there was a fire or gas event, the generators would need to have a quick and effective emergency shutdown procedure for safety. The AADvance system met this requirement by providing a fully independent shutdown path to the gas generator units, isolation of fuel gas valves and associated electrical systems. The system also immediately triggers the effected generators’ beacon and siren system plus the Plant Wide Emergency Siren giving personnel who may be in the area maximum time to evacuate.

To help make the commissioning process as seamless as possible, detailed FAT testing was conducted and was integrated with the existing plant HMI system. “When we were ready to commission the system onsite, we didn’t have to make any changes thanks to the prior testing. In addition, the control room only offered a confined amount of space but because the AADvance system was so compact we could fit it into a standard panel,” said Nigel Campbell, field technical lead, PSA Engineering.

Fire and gas safety compliance

As a result of the upgrade, the plant is now compliant with IEC 61511 SIL2 design Fire and Gas Safety Instrument System regulations. Furthermore, the system was designed to meet the strict guidelines of OLF, the Norwegian Oil Industry Association. OLF-070 sets a high safety performance target for fire and gas safety systems designed as per this standard.

Rockwell Automation has assisted PSA with comprehensive system training and support for the duration of the project. This collaboration has allowed for the sharing of lessons learned and best practices used on a global scale, which helps to deliver effective solutions to the oil and gas market.

“As part of our Recognized System Integrator Program with a specific focus on process safety, Rockwell Automation enjoys a longstanding relationship with PSA. We support PSA through our global network of technical support for our process solutions. This support helps to enable execution for defined project deliverables in the oil and gas industry,” said Wayne Perry, sales manager Queensland, Rockwell Automation.

About Rockwell Automation


Rockwell Automation Australia and Rockwell Automation New Zealand are subsidiaries of Rockwell Automation, Inc.—a leading global provider of industrial automation and information solutions that helps manufacturers achieve a competitive advantage in their businesses. The company brings together leading global brands in industrial automation which include Allen-Bradley® controls and services and Rockwell Software® factory management software. Its broad product mix includes control logic systems, sensors, human-machine interfaces, drive controllers, power devices, and software. 



Rockwell Automation Inc. (NYSE: ROK), is a global leader in industrial automation and digital transformation. We connect the imaginations of people with the potential of technology to expand what is humanly possible, making the world more productive and more sustainable. Headquartered in Milwaukee, Wisconsin, Rockwell Automation employs approximately 23,000 problem solvers dedicated to our customers in more than 100 countries. To learn more about how we are bringing The Connected Enterprise to life across industrial enterprises, visit www.rockwellautomation.com

AADvance, Allen-Bradley, PartnerNetwork, Rockwell Automation and Rockwell Software are trademarks of Rockwell Automation, Inc.

Media contact:
Christine Filippis
Teraze Communications
61 3 8391 0701
christine@teraze.com.au

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