An agreement between Tyco Valves and Controls and Chevron Texaco to manage the performance of pressure relief valves at ChevronTexaco’s Pembrokeshire oil refinery has improved valve reliability on site and increased the intervals between valve servicing by two-thirds. Tyco was selected by Chevron Texaco in 1998 to instigate a root based inspection programme to ensure the reliability of pressure relief valves on site, as well as providing full time on-site coordination and spares for all 2729 pressure safety relief valves at the plant. The Tyco valve management contract deals primarily with pressure relief, thermal relief, pressure vacuum and vacuum safety valves. Tyco also provides new, replacement valves, including instrumentation, gate and ball valves to Texaco Chevron.