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JasonComley
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What are the 2 categories of LPG incident?
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Define A class LPG? 2 points.
- Fixed LPG bullets.
- Large transport bullets.
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Define C class LPG?
- Fixed cylinders.
- Portable containers.
- Vehicle LPG system.
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Considerations on approach to LPG incident? 3 points.
- Approach from upwind and uphill if possible.
- Appliances to be positioned to make use of protection from buildings or environment.
- Consider evacuation.
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How big should the hot zone be at an LPG incident for small containers or vehicles?
100m radius.
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How big should the hot zone be at an LPG incident for large bullets?
300m radius.
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How big should the hot zone be at an LPG incident for a storage facility or large tanker?
1500m
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What consideration needs to be made when deciding whether to extend the hot zone and an LPG incident?
The wind.
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What is the operational procedure at an LPG fire? 12 points.
- Identify seat of fire.
- Estimate size of storage.
- Assess probability of BLEVE occurring.
- Activate emergency shut-off system.
- Do not extinguish flame except by isolating source.
- Extinguish any fire that may have spread.
- Cool LPG containers with water spray over upper surfaces of container and adjacent pipework.
- Protect personnel cooling container with additional fog sprays.
- Establish monitors and withdraw personnel.
- Consult with staff to establish isolation valves.
- Continue cooling until escape is controlled.
- Consider construction of dams and re-use of water.
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What is the operational procedure at an LPG leak without fire? 9 points.
- Activate emergency shut-off system.
- Personnel in immediate area of leak to be protected with fog sprays.
- Potential ignition sources to be minimised, extinguished or shut off. *it may be necessary to have power authority isolate electrical supply.
- Use detectors to identify area where vapour is hazardous.
- Disperse LPG with fixed water sprays across path of vapour.
- Protect personnel operating these sprays with additional fog sprays.
- Consult with staff to establish location of isolation valves.
- Direct water on area of escape only if valves used to stop flow are closed, water may cause valves to freeze and be inoperable.
- Continue dispersing vapours until leak is stopped and hazard no longer exists.
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What is the operational procedure for vehicle LPG system? 10 points.
- Assess situation.
- Isolate immediate area.
- Approach from upwind.
- Disperse leaks with fog spray.
- Shut off supply valve on tank by turning clockwise.
- If there is a fire extinguish only by isolating.
- If necessary to open boot do so under fog spray.
- Stay clear of discharge point of pressure relief valve.
- Cool tank if exposed to heat or flame.
- All staff in immediate area to wear full PPE with gloves, helmets and visors down.
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