Combustibility
Fire and explosion are serious dangers in a confined space. Fumes and vapors will ignite more quickly in the trapped air. Flammable and combustible gases or vapors may be present from previous cargoes, tank coatings, preservatives and welding gases. These built-up vapors and gases can be ignited by faulty electrical equipment, static electricity, sparks from welding or cigarettes.

Toxic Air Contaminants
These contaminants occur from material previously stored in the tank or as a result of the use of coatings, cleaning solvents or preservatives. Unfortunately, you won't be able to see or smell most toxic, but they present two types of risk in a confined space. First, they can irritate your respiratory or nervous system. Second, some toxic chemicals can cut off your oxygen supply or get into your lungs and asphyxiate you.

Working in Confined Spaces
Once you recognize a hazard, there are several important steps to follow when working in a confined space. You should plan carefully before entering the space at all. Then you should test the air before entry and periodically as you work. If there are any hazards in the space then it is a permit- required confined space and you may enter only if following your company's confined space permit program. Finally, you should have a rescue plan in case of an emergency. Work in and around confined spaces must be viewed as a total process. Safe entry is only the beginning. You want to enter, complete your work, and exit safely.


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