1. What are the 2 categories of LPG incident?
    • A¬†class.
    • C class.
  2. Define A class LPG? 2 points.
    • Fixed LPG bullets.
    • Large transport bullets.
  3. Define C class LPG?
    • Fixed cylinders.
    • Portable containers.
    • Vehicle LPG system.
  4. 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.
  5. How big should the hot zone be at an LPG incident for small containers or vehicles?
    100m radius.
  6. How big should the hot zone be at an LPG incident for large bullets?
    300m radius.
  7. How big should the hot zone be at an LPG incident for a storage facility or large tanker?
  8. What consideration needs to be made when deciding whether to extend the hot zone and an LPG incident?
    The wind.
  9. 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.
  10. 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.
  11. 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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