Safety Interlocking Pressure Relief Valve Systems
Most modern piping arrangements include spare relief capacity, which enables continuous production while routine maintenance procedures are conducted. This eliminates the need to isolate and shut down the process on a live plant, which has major time and cost saving advantages.
Twin or multiple safety relief valve systems are usually fitted with isolation block valves upstream and downstream of each safety relief valve. It is imperative to open the block valves isolating the spare relief valve before the block valves of the work-piece relief valve are closed. This is a more acute problem if the respective relief valves and isolating block valves are distant or out of sight of each other.
Various API and ASME codes recognise this hazard and recommend the use of interlocks to safeguard the process. By fitting a valve interlock to the upstream and downstream isolating valves, it ensures the process occurs only in the safe, designated sequence and recommendations are fully implemented.
Smith Flow Control Ltd
Tel: +44 (0)1376 517 901
Published in Valve User Magazine Issue 27
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