Polyurethane Processors were asked to reline large valves which use a ball to seal alternative inlets. The initial valve body and lid were previously lined by another company using Hot Cast Polyurethane with ceramic tiles bonded in to high wear areas. Ultra-high pressure water from our Hydro Knife Equipment was utilised to strip out worn linings. It was noted that the existing lining was partly de-bonded. When casting the new Lining, extreme care was taken to ensure full bonding was achieved. Associated pipework was also stripped and relined, partial de-bonding was observed in these items also. De-bonded Linings can suffer failures allowing sections of Lining material to become detached, which can cause a blockage and shut down the plant. Polyurethane Processors thorough surface preparation, casting and curing procedures prevent bond failures.
March 31, 2017