Two ordinary readings that only mean something together.
Most plant faults are not a single reading crossing a line. They are two unremarkable readings that only mean something in combination, which is exactly what a single-point threshold cannot express.
What a maintenance engineer is actually reading.
- Specific power
- kW per m³/min of compressed air. Usually the most expensive utility in the building per unit of work
- Pressure dew point
- ISO 8573-1 humidity class. Wet air ruins a paint finish long before it damages a tool
- Tool wear
- Cumulative minutes to change-out. A tool changed at a planned stop costs minutes; one that fails mid-cut costs the part and sometimes the fixture
- Heat dissipation
- The gap between process and air temperature. Closing while the spindle turns slowly is the condition that precedes failure
- OEE
- Availability × performance × quality — useful as a scoreboard, useless as a diagnosis
- ISO 14224
- The reliability and maintenance taxonomy, so the same equipment spine carries into oil and gas
ISO 14224, ISO 10816 and ISO 8573-1.
ISO 14224 governs collection and exchange of reliability and maintenance data — the taxonomy that lets failure history mean the same thing across two sites. ISO 10816 sets the vibration zones. ISO 8573-1 defines compressed air purity classes, including the pressure dew point a paint line depends on.
The machining examples use the AI4I 2020 synthetic predictive-maintenance dataset. Its simulated failure conditions illustrate relationships between tool wear, temperature and spindle speed; they are not validated alarm limits for your equipment.
AI4I 2020 is published by the UCI Machine Learning Repository under CC BY 4.0. No rows are redistributed here. See the UCI dataset description. Site thresholds require equipment-specific validation.
What a tool failure costs mid-cut.
Changing a tool during a planned stop costs minutes. The same tool failing mid-cut costs the part, the cycle, and frequently the fixture — and the wear that predicted it was accumulating in plain sight the whole time.
The heat-dissipation case is worse, because neither reading looks wrong on its own. The process temperature is fine. The spindle speed is fine. Together they say the machine has stopped shedding the heat it is making.
Plant utilities, process and the line.
Operate and maintain
Relate short stops, drift and utilities faults to the work orders and changeovers that preceded them, so a recurring loss is found once instead of every shift.
Commission and hand over
Bring line, utilities and process documentation, FAT/SAT evidence and open punch items into one review before handover. Discrete and process plants alike: food & beverage, life sciences, chemicals, metals.
Systems in scope: PLCs, SCADA, historians, MES and CMMS. Integration scope depends on the installed system, available interfaces and agreed access. Explore the terminology.
The handover was one line in a logbook.
At BP Texas City on 23 March 2005, the night lead operator left an hour early. The day supervisor arrived an hour late and held no turnover. The entire written handover for a unit in start-up was one logbook entry: “ISOM: Brought in some raff to unit, to pack raff with.” Fifteen people died that afternoon.
The CSB found that “BP did not have a shift turnover communication requirement for its operations staff.” Nothing recorded the state the unit was actually in, or why. A record that holds every setpoint, override and work order with who made it and the reason they gave is the turnover that does not depend on anyone writing a second line.
U.S. Chemical Safety Board, Final Investigation Report 2005-04-I-TX, 2007, §2.5.4.
Configure the platform around your equipment.
Start with a relevant industry pack, then tailor its equipment points, monitoring rules and alerts to your specifications. Combine it with compatible custom models and map checks to the standards and procedures your team works to.
It runs on the historian you already have.
We will assess exports or supported interfaces from AVEVA Historian, Siemens WinCC or Emerson DeltaV before agreeing the trial scope. Regulated production has its own vocabulary and its own evidence burden: see food and beverage and pharmaceutical and medical device.