Ensure Safe Flammable Vapour Dilution with AS 1375 Compliance

Prevent hazardous volatile accumulation in process ovens. GasCalc implements the exact safety factors, peak evaporation multipliers, and thermal expansion corrections required by AS 1375:2023, giving you verified dilution target airflows for Type B safety cases.

See How It Works

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Core Capabilities & Calculations

AS 1375 Safety Factors (C)

Enforces strict compliance with Clause F.6.3. Automatically checks temperature limits and prevents the usage of simplified safety factors above standard-defined boundaries (e.g., C = 2 for batch processes under 260°C).

Peak Evaporation Multipliers

Calculates instantaneous peak rates for batch process ovens under Clause F.7.2, applying standard multipliers (3.0x for cycles under 20 mins, 2.5x for cycles over 1 hour) based on volatile release patterns.

Gas Thermal Expansion (F)

Includes exact mathematical corrections under Clause F.8 for exhaust volume changes as operating temperatures rise, calculating how much fresh air expansion is needed at design temperature.

Cross-Calculator Verification

Bi-Directional Bridging

Seamlessly redirect from Process Oven Dilution to Airflow Rate to input field measurements, and return directly to verify compliance status against targets.

Shared Engineering State

Saves measured airflow outputs in a secure, local session state, allowing the dilution tool to instantly import results for quick and reliable compliance audits.

Instant Compliance Badging

Render green PASS / red FAIL compliance boxes comparing measured vs. calculated target airflows, showing regulators a crystal-clear audit trail.

How the Calculator Works

GasCalc determines the target safe dilution airflow by parsing your solvent parameters, operating temperature, and process type.

1

Define Process Parameters

Choose continuous or batch oven types, enter your average solvent evaporation rate, and input the maximum operating temperature.

2

Select Solvent Properties

Choose from common industrial solvents (Toluene, MEK, Acetone) or apply the standard AS 1375:2023 unknown solvent rule-of-thumb.

3

Perform Verification Bridge

Click to redirect to the Airflow Rate calculator to measure exhaust velocity, then import it back to automatically prove compliance.

Legislative Framework

AS 1375:2023, Cl F.2: Mandates the core equation for safe dilution volumetric airflow: D = C × V₂₀A₂₀ × Q × F.

AS 1375:2023, Cl F.6.3: Prescribes Safety Factors (C = 4, 2, or 1.5) and defines temperature ceilings (C = 1.5 allowed only up to 120°C; C = 2 up to 260°C).

AS 3814:2018, Cl 2.1.1.1: Dictates that the design of industrial appliances where flammable volatiles are released must comply with AS 1375.

AS 3814:2018, Cl 2.18.2: Requires self-checking airflow proving safety devices to trigger locks if exhaust flow rate drops below safe limits.

State Regulatory Acts: The VIC Gas Safety Regulations 2018 (Reg 13), SA Gas Regulations 2012 (Reg 43(1)(a)), and WA Gas Standards Regulations 1999 (Reg 18(2)) legally mandate strict adherence to AS 3814 and AS 1375.

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