Plant shutdown and startup procedures

Identifies substantive industrial plant shutdown, startup, emergency-shutdown, and turnaround procedures. Topic phrases are retained for discovery; enforcement requires ordered isolation, depressurisation, purge, valve, pump, permissive, interlock, handback, or verification actions, and high confidence also requires a populated equipment identifier, operating value, or timing.

Type: regex
Engine: boost_regex
Confidence: medium
Confidence justification: Medium confidence requires executable process actions rather than a procedure title. High confidence adds live equipment, operating, or timing detail.
Detection quality: Topic false positive
Jurisdictions: global
Regulations: GDPR
Frameworks: ISO 27001, NIST CSF
Data categories: security
Scope: wide
Risk rating: 8
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Degraded, Netskope: Unsupported

Pattern

(?is)\b(?:plant\s+shutdown\s+and\s+startup\s+procedure|plant\s+shutdown\s+procedure|plant\s+startup\s+procedure|emergency\s+shutdown\s+procedure|shutdown\s+sequence\s+procedure|startup\s+sequence\s+procedure|turnaround\s+startup\s+procedure)\b

Corroborative evidence keywords

plant shutdown and startup procedures, plant, shutdown, startup, procedures, critical, infrastructure, systems

Proximity: 300 characters

Should match

plant shutdown and startup procedure — Low-tier probe - procedure topic without executable actions
Plant shutdown procedure: isolate feed, close valve, depressurize, purge the line, verify zero energy, and complete the interlock check — Medium-tier probe - ordered process actions without populated equipment or values
Plant shutdown procedure for unit ID: U-04: isolate feed, close valve tag: XV-204, depressurize to 0.2 MPa within 15 minutes, and verify the ESD interlock — High-tier probe - ordered actions with equipment, pressure, timing, and interlock detail

Should not match

unrelated generic text without domain phrases — No relevant topic phrases present
placeholder value 12345 — Random text should not match topic-specific regex
shutdown checklist — Generic word pair from old broad template should not match
The process-safety standard describes principles for safe plant shutdown. — General safety guidance without an executable procedure
Training example: plant shutdown procedure for unit U-04, valve XV-204, 0.2 MPa within 15 minutes — Explicit training content must not enforce

Known false positives

Process-safety standards and maintenance guidance discuss shutdown, startup, isolation, purge, and interlocks without exposing an executable plant procedure. Mitigation: Keep procedure topics discovery-only and require concrete ordered process actions for enforcement.
Training simulations can include realistic equipment tags, pressures, timing, and emergency-shutdown steps. Mitigation: Reject explicit template, demo, tutorial, sample-data, and training-example framing from enforcing tiers.