Demystifying Industry 4.0

A: The boundary here is response time versus process ramp rate. A SIL rating assumes the logic executes; a network reboot can stretch the response past the pressure rise time, leaving overpressure credible. The other effects confuse cyber or maintenance issues with direct cause‑consequence physics.

A: The hard number is the required risk reduction factor, not operator preference. IEC 61511 credits only functions with bounded response time and proven failure rates. Alarms don't meet that threshold even if they're logged, visualized, and trend nicely in a smart factory stack.

A: The limiting value is zero g if the sensor is loose or misoriented. Mechanical fit and orientation come first because bad mounting corrupts every downstream digital step. Time sync, analytics, and certificates all assume the raw signal is physically valid.

A: 94.7% is a probability, not a safeguard. Fast failure modes with time constants shorter than the data refresh interval sit outside the model's envelope. Trend-based detections handle slow degradation, not step changes like oil starvation.

A: The delta is roughly 10% for natural gas. Standards separate HHV and LHV so reported efficiency matches physical recovery. Mixing them skews KPIs and can hide losses even if the data pipeline is perfectly automated.

A: The threshold is traceability to a known accuracy class. A digital twin amplifies whatever it's fed; uncalibrated inputs turn simulation into fiction. Naming, bandwidth, and roles matter later, but they don't fix bad physics at the source.

A: The boundary is the maximum allowable stroke time in the safety requirement. A 30% increase erodes margin; partial-stroke proves movement, not speed under full differential pressure. The other effects don't map directly to the hazard being mitigated.

A: The hard constraint is statistical relevance under matching conditions. IEC 61511 allows interval changes only when failure data truly applies. Fleet averages from different services dilute the failure rate and inflate confidence beyond what's defensible.

A: 1.3x MAWP is the safety boundary that matters. If the P&ID defines it and you control changes through MOC, you preserve intent without guessing hidden limits. Bypassing or shifting the setpoint trades schedule for uncontrolled risk; stopping outright ignores the approved derogation.