2011 Emerson Exchange – Wireless Relief Valve Monitoring is Now Possible

Wireless devices are finding their way into more and more applications. The abstract from this session is:

Monitoring of relief valves is a challenge, detecting when they are “simmering”, or have lifted-off, or if after a lift-off did they re-seat fully. Sometimes knowing exactly when and how long an emission lasted is of value, especially with fugitive emissions. In the past when relief valves went off costs associated with fines assumed the worst case scenario. This presentation covers the results from at least one customer installation where innovations in wireless monitoring were not available until now. This presentation will cause you to rethink your approach to solving problems.

Emerson's Kurt Jensen describes wireless pressure relief valve monitoringPressure relief valves (PRV) are designed to open and relieve pressure from the process. At 93-98%, the relief valve begins to simmer and provide an audible sign the relief valve is close to tripping.

Wireless pressure relief valves provide a way to detect when they are getting close to releasing pressure. Emerson’s Kurtis Jensen described how the wireless PRV technology, the Fisher 4320 electronic position transmitter, worked. The goal is to get away from the manual measurements and provide early warning and data when a pressure release incident occurs. What’s required is that the position monitor can access the PRV valve stem to monitor its movement.

Federal, state, and local regulations govern the release of production materials released through pressure relief valves. By monitoring the PRVs wirelessly, the exact timestamp of the incident can be captured and added to the regulatory reporting. Kurt explained how exception-based reporting helps reduce the batter consumption on the position transmitter and accurately capture the start and end of the pressure release event. The PRV actually reports the incident to the automation system to include in its reporting applications.

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