Workers Burned in Oxygenated Air Two men working for a municipality subcontractor died of burns received while installing a valve in a concrete sewage channel. The victims both had confined space safety training and were using a pneumatic hammer to chip the concrete channel wall. The first man's clothing abruptly caught fire. The second man jumped into the channel to help the first, but his clothing also caught fire. Co-workers shouted at them to "stop, drop and roll,? but the men suffered burns to 80 percent of their bodies. The men were transported to a burn center, where they died of their […]