Sensors & Transducers


Fire risks that affect the power generation industry

March 2013 Sensors & Transducers

Power generation plants can pose significant fire risks. There are many different areas on a plant, each posing unique fire threats that could be catastrophic if not protected adequately. In the case of a suitably protected power plant, each of the identified risk areas would need fire detection, extinguishing and suppression capabilities. It may also be necessary to ensure building structures are compartmentalised against the spread of fire and smoke.

There is currently no specific standard in South Africa which relates directly to fire protection for power generation plants. Warehouses, workshops, offices, storage areas, gas turbo-generators, compressed gas storage sites and flammable liquid storage are just some of the many applications that pose a substantial fire risk on the plant, but there are also others that need to be considered.

Lubricating oil systems

Lubricating oil systems, tanks, pumps and filtration units can be protected by an impulse dry powder unit such as Alien Systems & Technologies’ Pyrostorm units. Large gearboxes, which contain hundreds of litres of oil, should also be protected because their loss would have a detrimental effect on the operation of the plant. These areas should be bunded and the bund needs to be correctly designed – stone chips look pretty but they reduce the bund volume substantially.

Switchgear

For more than 10 years AST Africa’s Pyrogen product has been utilised by companies as a preferred method of switchgear fire protection. The aerosol fire extinguishing system was developed from solid rocket fuel technology and is a safe and practical alternative to chemical powders and inert gases.

Pyrogen offers key protection against fire threats for switchgear compartments and motor control centres. It is an inert non-toxic solid that remains stable until electrically or thermally activated, whereupon it produces a gas-like extinguishing aerosol. The aerosol attacks the fire chemically and physically, giving fast extinguishing and preventing re-ignition.

Solid fuel storage and handling

When it comes to solid fuel handling elements such as conveyors, detection is the best protection. A detector which employs infra-red monitoring technology that enables the detection of both small glowing embers within direct sight of the sensor and black body low energy sources buried within the transported material should be utilised. AST Africa’s Pyroscan3 unit is one such detector. The belt drives should also be linked to the fire detection system so that belts are stopped if a fire is detected. It is also necessary to ensure the belts are fire resistant.

Control, computer and communications rooms

This is where control of the plant and its equipment take place. A gas total flooding system is best utilised in these applications. Total flooding means flooding the room containing the asset with a gaseous medium which will inhibit combustion and extinguish the fire. This method of fire protection has become a popular solution among fire engineers and businesses alike.

The Pyroshield system is engineered utilising a fixed nozzle agent distribution network. It is designed and installed in accordance with the National Fire Protection Association (NFPA) Standard 2001, ‘Clean Agent Fire Extinguishing Systems’. When properly designed, the system will extinguish surface burning fires in Class A, B, and C hazards by lowering the oxygen content below the level that supports combustion.

The system can be actuated by detection and control equipment for automatic system operation along with providing local and remote manual operation as needed. This is particularly useful for extinguishing fires in hazards where an electrically non-conductive medium is essential or desirable, where clean-up of other agents presents a problem or where the hazard is normally occupied and requires a non-toxic agent.

For turbine auxiliary plants, including fuel forwarding skids, lubricating oil skids and tanks, a unit such as Pyrostorm can be used as protection. Pyrostorm is ideal for protecting industrial risks such as transformers, oil pack rooms, exposed pumps and motors. It can be used in conjunction with voltage free heat activation devices, which can provide reliable electrical activation via temperature sensing without the need for batteries or electrical supplies.

For more information contact Samantha Wright, Alien Systems & Technologies, +27 (0)11 949 1157, sam@astafrica.com, www.astafrica.com



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