108 | Baker Hughes.
© 2021 Baker Hughes Company. All rights reserved.
eDD:
KPIs alerts are configurable through the eDD and status bits are available through
standard command 48 requests. Few KPIs are also available to read most recent values
as dynamic variables. No historical data trending or database functionality is available
through the eDD.
7.4.1.5 Valve Health KPIs – Definitions and Use Cases
Friction (Avg%):
Dynamic friction is a very important KPI to consider when identifying changes in the valve
performance over time. Friction is calculated away from the stops (not near seat, not near
full open). Movement of the valve is necessary for the Friction calculation to be valid.
Extremely small and large movements are excluded from friction calculation.
Calculated values will be compared against the programmed limits every hour, or during a
read/write of the limits to the device, or at the completion of a standard/extended
signature test.
High Friction values may be an indication of problems with valve wear, such as plug/cage/
seal ring interference, or packing gland/stem issues. Low Friction values may be an
indication of packing gland wear