化学工程
ToolFusion / Air Blast Cabinet / Engineering Tools

Project Tool: FAT/SAT execution and reporting for air blast cabinets

Specification & Integration Verification

F6 Composition for FAT/SAT execution and reporting for air blast cabinets

● Not Golden Verified ● Project Trust Verified Runnable: 7 / 9 steps
VERIFIED SCOPE
○ Determine max allowable grounding resistance per IEC 60079-14 Table 12 CALCULATION Manual Workflow
○ Assess grounding compliance by comparison PASS / FAIL capable Runnable
○ Size purge airflow to compensate for enclosure leakage CALCULATION Runnable
○ Verify purge flow meets minimum overpressure requirement per IEC 60079-2 PASS / FAIL capable Runnable
○ Determine maximum allowable E-Stop response time per IEC 62061 SIL-2 PASS / FAIL capable Runnable
○ Derive kinematic stopping time limit from hazard velocity and distance CALCULATION Runnable
○ Validate E-Stop response against stricter of two thresholds CALCULATION Runnable
○ Extract mandatory interlock states from NFPA 85 Section 5.4.3 PASS / FAIL capable Runnable
○ Compare implemented logic against NFPA 85 truth table CALCULATION Manual Workflow
⚠ This tool does not currently verify Alarm correlation sequence verification.
PROJECT INPUTS

Runnable deterministic steps: 7 / 9. Enter the project conditions used by this verification workflow. Prefilled values (12/13 inputs) are demonstration inputs, not recommended design values.

01Step 1: Determine max allowable grounding resistance per IEC 6007...Manual Workflow
dimensionless
To establish the regulatory threshold against which measured grounding resistance must be compared.
02Step 2: Assess grounding compliance by comparisonValidation Rule
Ω
To deterministically evaluate pass/fail status based on measured vs. allowed resistance.
03Step 3: Size purge airflow to compensate for enclosure leakageFormula
m³
1/h
To ensure continuous overpressure by supplying air at a rate exceeding worst-case leakage under operational conditions.
04Step 4: Verify purge flow meets minimum overpressure requirement ...Validation Rule
m³/h
To confirm that the calculated flow sustains ≥25 Pa overpressure under steady-state leakage conditions.
05Step 5: Determine maximum allowable E-Stop response time per IEC ...Validation Rule
dimensionless
To obtain the safety-integrity-based time threshold for validation.
06Step 6: Derive kinematic stopping time limit from hazard velocity...Formula
m
m/s
m
m/s
To independently verify E-Stop timing using motion physics, satisfying ANSI B11.19 Annex D ‘Stopping time calculation’.
07Step 7: Validate E-Stop response against stricter of two thresholdsFormula
s
To enforce compliance with the most restrictive requirement between functional safety and mechanical hazard mitigation.
08Step 8: Extract mandatory interlock states from NFPA 85 Section 5...Validation Rule
dimensionless
To define the authoritative reference logic for comparison.
09Step 9: Compare implemented logic against NFPA 85 truth tableManual Workflow
boolean_vector
To detect deviations in safety-critical state dependencies.

⚠ Runnable deterministic steps: 7 / 9. Steps marked "Input Required" or "Example Input Required" need user-provided engineering values before calculation.

Deterministic calculation · Results become stale when engineering inputs change.
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ENGINEERING EVIDENCE

Golden Coverage0 / 9
Project Trust11 / 11 PASS
RuntimeDeterministic
Components0 small tools, 9 steps

SCOPE & LIMITATIONS

NOT CURRENTLY VERIFIED
○ Alarm correlation sequence verification
These capabilities are outside the current verified workflow.

HOW THIS VERIFICATION WORKS

  1. Step 1: Determine max allowable grounding resistance per IEC 60079-14 Table 12 — engineering workflow step. Follow the documented method for manual execution.
  2. Step 2: Assess grounding compliance by comparison — compares engineering inputs against deterministic thresholds and produces a PASS or FAIL decision.
  3. Step 3: Size purge airflow to compensate for enclosure leakage — performs a deterministic calculation from the provided inputs. No acceptance criterion is applied; the result is CALCULATED only.
  4. Step 4: Verify purge flow meets minimum overpressure requirement per IEC 60079-2 — compares engineering inputs against deterministic thresholds and produces a PASS or FAIL decision.
  5. Step 5: Determine maximum allowable E-Stop response time per IEC 62061 SIL-2 — compares engineering inputs against deterministic thresholds and produces a PASS or FAIL decision.
  6. Step 6: Derive kinematic stopping time limit from hazard velocity and distance — performs a deterministic calculation from the provided inputs. No acceptance criterion is applied; the result is CALCULATED only.
  7. Step 7: Validate E-Stop response against stricter of two thresholds — performs a deterministic calculation from the provided inputs. No acceptance criterion is applied; the result is CALCULATED only.
  8. Step 8: Extract mandatory interlock states from NFPA 85 Section 5.4.3 — compares engineering inputs against deterministic thresholds and produces a PASS or FAIL decision.
  9. Step 9: Compare implemented logic against NFPA 85 truth table — engineering workflow step. Follow the documented method for manual execution.

This tool coordinates 4 validation steps and 5 calculation steps. The overall engineering decision uses ALL_REQUIRED_VALIDATION_PASS aggregation: only validation steps contribute to the pass/fail outcome; calculation steps produce data only.

METHODS & EQUATIONS

All formulas are resolved from canonical runtime definitions and executed deterministically by the client-side engine.

Step 1: Determine max allowable grounding resistance per IEC 60079-14 Table 12

Manual Workflow
Lookup R_max from IEC 60079-14:2023, Table 12 — 'Maximum earth resistance values for earthing systems in explosive atmospheres', selecting row corresponding to 'Zone 1 or Division 1' and 'Equipment with bonding/earthing requirements for static control and fault protection'. Value is 10 Ω.

Step 2: Assess grounding compliance by comparison

Validation Rule
measured_grounding_resistance <= 10 [engineering_standard:IEC_60079-14:2023_Table_12]

Step 3: Size purge airflow to compensate for enclosure leakage

Formulaenclosure_internal_volume * maximum_allowable_leakage_rate_fraction * 1.2

Step 4: Verify purge flow meets minimum overpressure requirement per IEC 60079-2

Validation Rule
minimum_purge_air_flow_rate >= 5.4 [engineering_standard:IEC_60079-2:2014_Annex_B.3.2]

Step 5: Determine maximum allowable E-Stop response time per IEC 62061 SIL-2

Validation Rule
DC > 90 [engineering_standard:IEC_62061:2015_Table_D.1]

Step 6: Derive kinematic stopping time limit from hazard velocity and distance

Formula2*d_stop/v_max

Step 7: Validate E-Stop response against stricter of two thresholds

FormulaCompare measured_e_stop_response_time against both (a) max_allowed_response_time from IEC 62061 SIL-2 (0.100 s) and (b) kinematic_stopping_time_limit from ANSI B11.19 (0.100 s); declare compliant only if measured_e_stop_response_time <= min(0.100, 0.100) s.

Step 8: Extract mandatory interlock states from NFPA 85 Section 5.4.3

Validation Rule
pressure >= 25 [engineering_standard:NFPA_85:2023_Section_5.4.3.2]

Step 9: Compare implemented logic against NFPA 85 truth table

Manual Workflow
Perform bitwise equivalence check across all 16 combinations of 4 binary inputs (purge_ok, door_closed, dp_ok, flame_absent); flag non-conformance if any output differs from NFPA 85 Section 5.4.3.4 prescribed behavior (i.e., output = 1 iff all four inputs = 1).

UNDERSTANDING THE RESULTS

PASS
A proven validation criterion passed. The engineering input satisfies the deterministic threshold.
FAIL
A proven validation criterion failed. The engineering input does not satisfy the deterministic threshold.
CALCULATED
A deterministic calculation completed, but no acceptance criterion exists for this step. CALCULATED does NOT mean PASS.
RESULT NOT VALID
Runtime executed but engineering validity requirements were not met.
INCOMPLETE
Required inputs or workflow steps are incomplete.

The overall decision reflects only validation steps. Calculation steps produce numerical results without pass/fail claims.

WHEN TO USE THIS TOOL

  • When deterministic Air Blast Cabinet engineering verification is needed for project-specific conditions.
  • For calculation of Determine max allowable grounding resistance per IEC 60079-14 Table 12 (Step 1).
  • For validation of Assess grounding compliance by comparison (Step 2).
  • For calculation of Size purge airflow to compensate for enclosure leakage (Step 3).
  • For validation of Verify purge flow meets minimum overpressure requirement per IEC 60079-2 (Step 4).
  • For validation of Determine maximum allowable E-Stop response time per IEC 62061 SIL-2 (Step 5).
  • For calculation of Derive kinematic stopping time limit from hazard velocity and distance (Step 6).
  • For calculation of Validate E-Stop response against stricter of two thresholds (Step 7).
  • For validation of Extract mandatory interlock states from NFPA 85 Section 5.4.3 (Step 8).
  • For calculation of Compare implemented logic against NFPA 85 truth table (Step 9).
  • For deterministic pre-checks before formal engineering review or submission.

When NOT to use this tool: This tool does not replace laboratory testing, formal engineering analysis by a licensed professional, or code-compliance certification. It performs deterministic threshold comparison and calculation only.

ENGINEERING FAQ

What does this verification tool check?

This tool performs 9 deterministic engineering steps: (1) Determine max allowable grounding resistance per IEC 60079-14 Table 12, (2) Assess grounding compliance by comparison, (3) Size purge airflow to compensate for enclosure leakage, (4) Verify purge flow meets minimum overpressure requirement per IEC 60079-2, (5) Determine maximum allowable E-Stop response time per IEC 62061 SIL-2, (6) Derive kinematic stopping time limit from hazard velocity and distance, (7) Validate E-Stop response against stricter of two thresholds, (8) Extract mandatory interlock states from NFPA 85 Section 5.4.3, (9) Compare implemented logic against NFPA 85 truth table.

What does a PASS result mean?

A PASS result means the validation step's deterministic threshold comparison was satisfied. It does not constitute laboratory certification or code compliance.

What does a CALCULATED result mean?

A CALCULATED result means the deterministic calculation completed, but no acceptance criterion is applied to this step. CALCULATED does NOT mean PASS.

What is not currently verified by this workflow?

Capabilities not currently verified include: Alarm correlation sequence verification.

How many steps are golden verified?

0 out of 9 steps have been verified with deterministic golden test cases.

COMPONENT TOOLS

This workflow currently contains no bound executable Small Tools. Steps are defined by engineering methods and reference materials.

CalculationWorkflow StepVerify grounding resistance compliance for air blast cabinet per IEC 60079-14
ValidationWorkflow StepVerify grounding resistance compliance for air blast cabinet per IEC 60079-14
CalculationWorkflow StepCalculate required purge air flow rate for ATEX-certified air blast cabinet
ValidationWorkflow StepCalculate required purge air flow rate for ATEX-certified air blast cabinet
ValidationWorkflow StepValidate emergency stop response time against ANSI B11.19 and IEC 62061 SIL-2 requirements
CalculationWorkflow StepValidate emergency stop response time against ANSI B11.19 and IEC 62061 SIL-2 requirements
CalculationWorkflow StepValidate emergency stop response time against ANSI B11.19 and IEC 62061 SIL-2 requirements
ValidationWorkflow StepConfirm interlock logic truth table alignment with NFPA 85 combustion safety requirements
CalculationWorkflow StepConfirm interlock logic truth table alignment with NFPA 85 combustion safety requirements