Vapour stops are applied to the end of the low-density insulation by the installation contractor to prevent vapour from spreading along the pipe. It is standard practice to apply vapour stops each side of pipe supports, valves & flanged joints as it is usually accepted these items will need maintenance at some time in the life of the plant. Vapour stops consist of a short section of ‘sacrificial’ insulation each side of the support or valve. This can be removed easily without causing damage to the main insulation. A coat of sealant is applied to the exposed surfaces of our cryogenic supports during manufacture to prevent moisture damaging the insulation.