The problem of flange face corrosion
Piping systems in petrochemical refineries and oil & gas installations rely on hundreds of bolted joints which are exposed to corrosive conditions.
To ensure safe operation at these plants it is vital to carry out regular inspection to assure joint integrity is maintained. Until recently, the normal procedure to do this was to physically disassemble each flange joint to check on its condition. Using this method was costly as it required shutdown and in many cases is entirely unnecessary. Before we look at the alternatives lets first take a look at the different types of flange corrosion.