What is the recommended pressure setting on a relief valve to avoid false opening due to pressure surges?

The correct recommendation for setting the pressure on a relief valve to avoid false openings due to pressure surges is to position it 25-30 lbs higher than the system operating pressure. This approach accounts for normal fluctuations in operating conditions and transient spikes that can occur during sudden changes in flow or temperature within the system.

By setting the relief valve at this higher threshold, it ensures that the valve does not inadvertently open due to these minor pressure fluctuations, which could lead to unnecessary system downtime and increased maintenance needs. It also helps maintain the integrity of the system by only allowing discharge when the pressure exceeds a safe limit, therefore protecting both the piping and connected components from damage that could be caused by excessive pressure.

Other options either suggest insufficient pressure settings or do not directly relate to the specific need to account for pressure surges effectively.