Testing shows that for valves fitted with appropriate braided or structured packings, emissions performance at <500ppm is achievable provided that the packings are installed in accordance with manufacturer’s instructions and good practice. However, testing also shows that for a significant percentage of such valves, performance deteriorates with time. When performance does deteriorate to a point where the emission rate rises above a specified limit the leak can often be reduced by retightening the valve gland assembly. This approach is successful for approximately 50 - 70% of leaking valves with others having to be repacked to re-established;is leak free performance at below the specified limit.

Our fully trained personnel have experience in managing large scale repacks at a number of major UK Petrochemical sites. Where the packing cannot be removed with standard methods, we have specialist equipment so that even the most difficult packing can be removed.