Preventive Maintenance means routine checks. Cleaning, air leakage checking, gland leakage checking etc. are some normal stuffs which are generally done for a control valve. Apart from that depending on your plant's risk taking for a particular process you may devise other stuffs too like opening/closing a valve to some particular position and checking the time, stiction etc. but then again it all depends on a plan and close coordination between the process and the maintenance team, documenting it and following it.Hello there,
seeking your experience in the field of control valve best practices in term of preventive maintenance for control valve while the valve in operation mode
Thanks for your reply David... Kindly I have a question. What about ESDVs/BDVs/XVs maintenance strategy during turnaround??? How you select the valves to overhaul during turnaround?? As you know these valves not having smart positioners like control valves..The whole HART diagnostics thing is supposed to be about using the data in HART diagnostic counters that run continuously in the valve positioner and then analyzing that data to tell you which valves appear to need work.
The concept is predicated on having (relatively expensive, licensed) Asset Management Software with the functions to fetch and display the diagnostic data from the positioners along with the associated HART pass-through analog hardware needed to talk to and communicate with the positioner. I suspect that transmitters equipped with Foundation Fieldbus have the same functionality, but would also need the Asset Management software to deal with the diagnostics data.
My one run-in with a process engineer at a toilet paper manufacturer (where the machines run 24-7 except for a 14 day turn-around scheduled long in advance) revealed that the 200 odd hours (on an annual basis) he spent analyzing the data was well worth it because of the relatively limited resources available during the turn-around. The diagnostics enabled him to determine which valves needed an overhaul and which could wait, so that the resources could be targeted properly.
It was also evident from that conversation, maybe 12 years ago, that there is no cheat-sheet telling you how to interpret raw diagnostic information. It takes an experienced process engineer who understood the process, the media and valves to make judgment calls from the raw data about valve condition. No red light, yellow light, green light assessments from the software.
Maybe all that fluff about artificial intelligence has worked AI into industrial diagnostics, but I doubt it.
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by Jon Peterson