Incident Description:
A contract worker sustained minor burns to the face while conducting hot work (buffing) on exchanger piping.
What Was the Problem:
Ineffective job planning, hazard assessment, energy isolation and job supervision led to a flammable atmosphere being present during the hot work activity of buffing.
What Happened:
Flammable vapors entered the immediate workspace from a section of pipe that was not isolated. The source of the flammable material is suspected to have come from a low point in the piping, downstream of the isolation points but upstream of where the blinds were to be installed.
Given the overnight ambient temperature followed by the morning sun heating the pipe, the butane began to flash off.