Containment, Control, and Confinement
This domain tests whether you can distinguish stopping a release from holding it in place and then pick a technique that is compatible with the product and the container. Questions often describe a leaking drum or cylinder and ask for the correct next physical action.
The three terms
- Control: stop the release at its source, such as closing a valve or uprighting a container.
- Containment: keep material inside a container, such as patching, plugging, overpacking, or transferring product.
- Confinement: keep released material inside a defined area, such as diking, damming, booming, or covering with foam.
Techniques worth knowing
- Chlorine Institute kits A, B, and C address cylinders, ton containers, and tank cars respectively.
- Overpack a leaking 55-gallon drum into an 85-gallon salvage drum with compatible absorbent; never force a larger drum into a smaller one.
- Underflow dams and booms intercept product on waterways; skimmers recover it.
- Neutralization suits acids and bases but generates heat and gas; solidification and absorption suit small spills.
- Cylinder handling keeps the valve end up, cradles the container, and avoids rolling ton containers.
Compatibility rules
- Do not overpack an oxidizer with organic absorbent.
- Do not seal a container that is generating gas; provide controlled venting.
- Contain runoff before it reaches drains, soil, or surface water.
Worked example
A 55-gallon drum of an unknown liquid is leaking from a seam. Reasoning: first identify the product from markings, labels, and papers, because the overpack must be compatible. If the product is a flammable liquid, place the drum in an 85-gallon salvage drum with nonreactive absorbent, close the lid, and label the overpack with the proper shipping name and UN number. If the product is an oxidizer, use a compatible absorbent and verify venting. Dike the spill and contain runoff before overpacking.
Traps
- Overpacking incompatible materials together.
- Trying to fit a 55-gallon drum into a 55-gallon overpack.
- Sealing a container that is building pressure.
- Recovering product before containing runoff.