Abstract: An employee was standing 3 meters in front of a 203-millimeter-diameter pipe that was connected to a boiler. The boiler had undergone a descaling operation. As the employee was breaking down temporary equipment that had been used in that operation, a supervisor loosened a bolt holding a victaulic clamp that secured a 203-millimeter valve. The supervisor was not aware that the pipe contained water at a pressure of 25 pascals and a temperature of 93 degrees Celsius. When the supervisor loosened the bolt, the pipe ruptured, discharging a stream of water, which struck and burned the more distant employee. He was hospitalized with burns over 75 percent of his body.