Module 9: Control Techniques - International Association of Fire ...

Student Text IAFF Training for Hazardous Materials: Technician©
Venting and Burning
Venting and burning is a method of removing liquefied
flammable compressed gases or flammable liquids from a
tank by creating openings through the controlled use of
explosives. Explosive charges are strategically placed on
the tank—one at the highest point on the tank for venting
vapor and the second at the lowest point on the tank for
releasing liquid. The released contents are allowed to flow
into a pit for evaporation or burn-off.
Venting and burning is the last resort and is to be performed
only by experienced personnel.
Vacuum trucks
Vacuum trucks are frequently used to remove liquid hazardous
materials and waste from a response scene. They are
specifically designed and rated for certain types of hazardous
materials and can develop vacuum for on-loading or
pressure for off-loading. Vacuum trucks offer the advantage
of not having to develop higher pressures in the damaged
container. They can also be used to vacuum material
from the ground or other areas. A disadvantage is that they
must be placed relatively close to the damaged container or
product.
Always consider the risk versus the benefit in responding to
any situation that requires mitigation. You and other responders
should take every conceivable precaution to
reduce risk.
Even though Technicians are trained to enter hazardous
environments, their main focus should always be concern
for operational personnel and the fire service in general—
protection of themselves, the public, property and the
environment...in that order. Defensive actions should be
taken first. Containment activities should be done only
when all other options have been exhausted or have not
worked.
Activity
Module 9: Control Techniques 9-41