Safety Instrumented System Cause and Effect Matrix / HAZOP Worksheet

Plant-specific process safety engineering records: HAZOP (hazard and operability) study worksheets with node / guide word / deviation / causes / consequences / safeguards / recommendations columns, and safety instrumented system (SIS) cause and effect matrices and safety requirements with trip tags, voting (1oo2, 2oo3) and SIL ratings. Populated worksheets and matrices tie instrument tags and trip logic to a real facility, which is why enforcement needs populated tags and structure, not the methodology vocabulary that appears in standards, training and textbooks.

Type: regex
Engine: boost_regex
Confidence: medium
Confidence justification: Medium: the methodology vocabulary (guide words, deviations, SIL, voting) is common to standards, courses and textbooks, so enforce tiers require populated instrument tags and worksheet structure. ISA-5.1 tag shapes are a convention (the standard is paywalled and its full letter table was not verified), so only a whitelist of common tag prefixes is used and at least 5 distinct tags are required. IEC 61882 worksheet columns were verified only from secondary sources. 85/75 are heuristic evidence tiers, not measured accuracy; test values are synthetic.
Jurisdictions: global
Regulations: Security of Critical Infrastructure Act 2018 (Cth), Work Health and Safety Regulation 2011 (Qld)
Frameworks: IEC 61511, IEC 61882, ISA-5.1
Data categories: infrastructure, technology
Scope: narrow
Risk rating: 8
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Degraded, Netskope: Unsupported

Pattern

(?i)\b(?:HAZOP|hazard\s+and\s+operability\s+(?:study|review|worksheet)|cause\s*(?:&|and)\s*effects?\s+(?:matrix|chart|diagram)|C&E\s+matrix|safety\s+instrumented\s+(?:functions?|systems?)|safety\s+requirements?\s+specification)\b

Corroborative evidence keywords

P&ID, action owner, node, trip setpoint, safeguards, SIL, voting, interlock

Proximity: 1000 characters

Should match

HAZOP worksheet - Boiler 2 feedwater system - P&ID DWG-BLR2-PID-004 Rev C Node 4: Deaerator to boiler feed pumps Guide word | Deviation | Causes | Consequences | Safeguards | Recommendations | Action owner No | No flow | FV-2104 fails closed | Boiler low level | LSLL-2110 trips burner (2oo3), LT-2108 alarm | Review FV-2104 fail position | J. Teston More | High level | LIC-2108 fault | Carry-over to turbine | LSHH-2112 trip, PIC-2120 control | Confirm SIL 2 for LSHH-2112 | R. Staffson — 85 - populated HAZOP worksheet with header row, 5+ distinct tags, voting/SIL and P&ID reference
Cause and effect matrix - Gas turbine fuel skid, SIF-017 (SIL 2) Causes: PSHH-3301 fuel gas pressure high high (2oo3); TSHH-3310 exhaust temperature high high; LSLL-3320 knock-out drum level low low; FIC-3302 flow deviation; PT-3304 transmitter fault Effects: close ESDV-3300, close XV-3305, trip unit - trip setpoint 45 barg — 85 - cause and effect matrix with 5+ distinct tags, voting/SIL and trip setpoint
Hazard and operability study - chlorine dosing room Node | Guide word | Deviation | Causes | Consequences | Safeguards | Recommendations 1 | Less | Less dosing | Dosing pump failure | Low residual in reservoir | Residual analyser alarm | Add standby pump — 75 - HAZOP worksheet header row with one populated row, no tag set
Safety requirements specification - pump station wet well: safety instrumented function SIF-004 requires 1oo2 voting on the high high level switches. — 75 - safety instrumented function with a voting value, no worksheet or tag set

Should not match

IEC 61882 describes the HAZOP method: the team applies guide words such as No, More, Less, As well as, Part of, Reverse and Other than to each node to identify deviations, their causes and consequences, and the safeguards in place. — Standard / methodology description (no populated worksheet)
HAZOP worksheet blank template Node | Guide word | Deviation | Causes | Consequences | Safeguards | Recommendations ______ | ______ | ______ | ______ | ______ | ______ | ______ — Blank HAZOP worksheet blank template
HAZOP training exercise: for the example reactor in this course, the deviation "more temperature" could be caused by TIC-101 failing; safeguards include TSH-102 and PSV-103. Quiz: which guide word applies? — Training course example with a few textbook tags
The operator engaged consultants to run a HAZOP and review its safety instrumented systems before the new unit is commissioned next year, the company said. — News text naming the activities

Known false positives

Standards, textbooks, courses and consultant marketing use the HAZOP and SIS vocabulary. Mitigation: Enforce tiers need populated worksheet structure, a set of distinct instrument tags or voting / SIL values; training, course, textbook and example framing is excluded.
Instrument-tag shapes resemble part numbers and document codes. Mitigation: Only a whitelist of common ISA-style tag prefixes is used, and at least 5 distinct tags are required.
Worksheets laid out as images or in columns far apart after text extraction. Mitigation: Proximity is 1000 characters; image-only worksheets are not detected.