Ensuring Safety - Hollow or Enclosed Structures

Hollow or enclosed structures are objects that maritime employees work on, but not in. Such structures are not vented to clear the air, and may be filled with foam or preservatives to prevent corrosion. Some examples of such structures are drums, hull voids, pipe stanchions, booms, crane pedestals, mooring bitts and bollards, and container frames.

A variety of hazards exist during hot work on these types of structures. If flammable gases or dust are present inside the hollow structure, these may combust. Insulating foam or other materials may also be present inside the structure. With the application of heat, these hidden materials can ignite, causing fire, explosion, and the release of noxious gases.

Prior to allowing hot work, employers must ensure that a designated person tests the atmosphere inside the structure to ensure that it is not hazardous. It is also the responsibility of the employers to make fire extinguishing equipment available and ensure that workers are trained in its use.

To learn more about Shipyard Hot Work visit our Shipyard Hot Work Online Training web page.