Among the following choices, which is a vapor control tactic?

• A. Blanketing
• B. Heating
• C. Damming
• D. Draining

Answer: (A)

Blanketing is an effective vapor control tactic used to minimize the release of hazardous vapors into the environment. This technique involves applying a layer of inert gas, such as nitrogen or carbon dioxide, over the liquid surface in a storage tank or spill area. This blanket of gas helps to reduce the vapor pressure by physically covering the liquid, thus preventing vapors from escaping into the air. By reducing the amount of vapor that can escape, this method plays a crucial role in controlling potential exposure to harmful substances.

In contrast, heating can increase vapor pressure and worsen the situation, while damming and draining are more focused on containment and removal rather than preventing vapor release. These methods may be important in response tactics to manage spills or leaks but do not specifically target vapor control as effectively as blanketing does.