Fire safety management involves five steps that begin with identification.
Identify Source of Fire
Identify ignition source
- Smoking material: Cigarettes, matches, lighters
- Bonfire
- Electrical (faulty electronic equipment, light fitting, poor electrical installations and poor practice)
- Hot work (welding)
- Heat generated by friction (disc cutter, grinder)
- Arson / sabotage
Identify fuel source
Anything that burns is fuel. Reduce material quantity on site, do not stockpile. For stock with fire hazard, balance between production need and risk of fire exposure.
Look for things that is in enough quantity to become threat (timber, rubbish, paint, thinner, LPG, acetylene)
Identify oxygen source
Construction tends to be open space so the oxygen source is abundant, but special attention must be given to oxidizing agent like oxygen used in welding process.
Identify people at Risk
We must be aware who’s working on site that day. This includes employee, contractor, visiting personnel or public in nearby premise. Pay special attention to:
- Person who work alone (security staff, heavy machinery operator)
- Person who are unfamiliar with staff and premise eg. subcontractor or visitor
- Person with language difficulties
- Pregnant or disabled employee
Evaluate, remove, and reduce risk
There are three cause of fire: accident, deliberate act, and act or omission. The first two are self explanatory. The third one, act/omission is a failure to act, sometime deliberately in the full acknowledgement of the hazard. Examples:
- Storing LPG near electrical installment
- Neglecting inspection / maintenance of high voltage electrical installation
- Piling of rubbish too close to structure
The first two categories (accident & deliberate act) can not be eliminated but proper action can greatly reduce the probability of accident and sabotage. By identifying hazard, we reduce the risk of accident waiting to happen.
Reduce source of ignition
- Provide safe smoking environment and prohibit smoking outside this environment
- Build and control fire resistant environment for hot work process (eg: field weld)
- Control electric ignition hazard (eg: temporary lighting)
- Turn off equipment when unattended
Reduce source of fuel
- When possible introduce new substance to replace flammable material.
- Don’t stock flammable material on site. Keep it at minimum level just right to support operation. Protect with a secured cage in open space.
- Control waste and rubbish to prevent built up. Clean them periodically.
Reduce source of oxygen
- In refurbished compound, close door, window, and any other openings especially outside working hour.
- Control any form of oxidizing material, oxygen cylinder, etc and keep them well ventilated.
Fire is spread by three methods. Convection is the most dangerous way fire can spread. When fire start in enclose space, the smoke gets trapped by ceiling and spread in all direction and through any hole or gaps in the wall and floor. Conduction by structural steel, pipe and any other heat conductor can cause fire when heated conductor makes contact with combustible material. Fire can also spread by radiation. Any material close to radiation source can absorb the heat and burn.
Following precautions helps increase probability of survival:
- Availability of escape route and muster point. Exit routes must be free of obstruction and properly marked.
- Fire detection and alarm
- Fire-extinguisher on site. OSHA requires educational program to familiarize workers with general principle to use fire extinguisher. Hands-on training in using the equipment must be provided.
- Fire-fighting team
OSHA’s Fire Prevention Standard of Welding and Cutting
When practical, objects to be welded, cut, or heated shall be moved to a designated safe location or, if the objects to be welded, cut, or heated cannot be readily moved, all movable fire hazards in the vicinity shall be taken to a safe place, or otherwise protected. 1926.352(a)
If the object to be welded, cut, or heated cannot be moved and if all the fire hazards cannot be removed, positive means shall be taken to confine the heat, sparks, and slag, and to protect the immovable fire hazards from them. 1926.352(b)
No welding, cutting, or heating shall be done where the application of flammable paints, or the presence of other flammable compounds, or heavy dust concentrations creates a hazard. 1926.352(c)
Suitable fire extinguishing equipment shall be immediately available in the work area and shall be maintained in a state of readiness for instant use. 1926.352(d)
When the welding, cutting, or heating operation is such that normal fire prevention precautions are not sufficient, additional personnel shall be assigned to guard against fire while the actual welding, cutting, or heating operation is being performed, and for a sufficient period of time after completion of the work to ensure that no possibility of fire exists. Such personnel shall be instructed as to the specific anticipated fire hazards and how the firefighting equipment provided is to be used. 1926.352(e)
When welding, cutting, or heating is performed on walls, floors, and ceilings, since direct penetration of sparks or heat transfer may introduce a fire hazard to an adjacent area, the same precautions shall be taken on the opposite side as are taken on the side on which the welding is being performed. 1926.352(f)
For the elimination of possible fire in enclosed spaces as a result of gas escaping through leaking or improperly closed torch valves, the gas supply to the torch shall be positively shut off at some point outside the enclosed space whenever the torch is not to be used or whenever the torch is left unattended for a substantial period of time, such as during the lunch period. Overnight and at the change of shifts, the torch and hose shall be removed from the confined space. Open end fuel gas and oxygen hoses shall be immediately removed from enclosed spaces when they are disconnected from the torch or other gas-consuming device. 1926.352(g)
Except when the contents are being removed or transferred, drums, pails, and other containers which contain or have contained flammable liquids shall be kept closed. Empty containers shall be removed to a safe area apart from hot work operations or open flames. 1926.352(h)
Drums containers, or hollow structures which have contained toxic or flammable substances shall, before welding, cutting, or heating is undertaken on them, either be filled with water or thoroughly cleaned of such substances and ventilated and tested. For welding, cutting and heating on steel pipelines containing natural gas, the pertinent portions of regulations issued by the Department of Transportation, Office of Pipeline Safety, 49 CFR Part 192, Minimum Federal Safety Standards for Gas Pipelines, shall apply. 1926.352(i)
Before heat is applied to a drum, container, or hollow structure, a vent or opening shall be provided for the release of any built-up pressure during the application of heat. 1926.352(j)
To be continued to Fire safety in Construction Industry #3
Link and References
http://www.hse.gov.uk/pubns/books/hsg168.htm
http://www.osha.gov/OshDoc/data_General_Facts/FireSafetyN.pdf
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10698




