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

IAFF Training for Hazardous Materials: Technician©
Student Text
Small punctures, like nail punctures, are often hidden.
Expose them by laying the drum on its side and observing
for the location of the leak. Then orient the puncture above
the product. Sealants or plugs usually work well with
punctures.
Cylinders
Chlorine A and B kits are available for controlling chlorine
and container leaks. These kits are used to control valve
and plug leaks in 100-150 lb. chlorine cylinders (A kit) or
ton containers (B kit). Kits may be used on similar sized
cylinders, regardless of product. Chlorine leaks are controlled
by placing caps over the leak area and forcing them
into place with leverage from parts attached to the tank.
You must be trained to apply these kits. If your department
has them, make sure you receive regular training in their
use.
Plugging/Patching Pressure Vessels
Containing leaks from pressurized vessels such as cylinders
can be risky, depending on the product, the amount of
pressure of the container, and the possibility of vapor
clouds obscuring your vision.
These situations are difficult because of the specialized
tools required to control pressure leaks. Most of these
devices are designed for specific containers and consist of a
screw-on apparatus that allows the pressure to escape until
a control valve is closed. If you have access to these tools,
you should practice using them on non-leaking vessels.
First, practice without protective clothing until the parts and
procedures are familiar. Then practice wearing gloves and
SCBA. Finally, practice in full drills with chemical protective
clothing. Cylinders filled with compressed air can
provide more realistic training.
Leaks from pressure relief valves are not breaches. Pressure
relief devices are designed to safely release container
pressure and to protect container integrity. Sealing them in
any way may increase stress on the container system.
9-28 Module 9: Control Techniques