Visual Tools

Visual Gas Pipe Sizing: Draw, Calculate, and Comply

Stop risking compliance failures on manual math and generic tables. GasCalc transforms complex AS/NZS 5601.1:2022 regulatory requirements into a rapid, error-free digital workflow.

See How It Works

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Why Professionals Use This Tool

Stop risking compliance failures on manual math and generic approximations. GasCalc transforms complex AS/NZS 5601.1:2022 regulatory requirements into a rapid, error-free digital workflow.

Formula-Based Accuracy

Generic tables force you to round up and over-engineer. The calculator sizes consumer piping by automating the equations outlined in AS/NZS 5601.1:2022 Appendix F. It utilizes "an algorithm based on the Churchill's friction factor equation" in conjunction with the fundamental isothermal flow calculation for compressible fluids.

By analyzing exact equivalent lengths, internal roughness, and gas properties, GasCalc sizes every branch of your network perfectly.

Automated Compliance Audits

  • Pressure Verifications: Audits against Clause 5.2.4, ensuring you never deliver less than the mandatory 1.13 kPa (NG) or 2.75 kPa (LPG) to the appliance.
  • Velocity Warnings: Automatically flags sections at risk of exceeding velocity limits under Appendix F.1.6 (performance-based trigger).
  • Proprietary Systems: Supports Stainless Press, composite PEX, and pipe sizes not covered by conventional AS/NZS 5601.1:2022 lookup tables via "calculation provided by manufacturer" permitted by Clause 5.2.4(b).

Instant Shopping Lists & Audit Trails

Hit calculate, and the tool automatically generates a consolidated bill of materials, totaling up lengths required for each specific pipe diameter.

Simultaneously, it generates a transparent, step-by-step mathematical audit trail proving your friction factors, Reynolds numbers, and pressure drops to Technical Regulators.

How the Calculator Works

Sizing complex, multi-branch gas installations used to require hours of referencing tables. Now, it's as easy as drawing a diagram.

1

Draw the Network

Use the canvas to map out your gas installation. Add your meter/regulator as the starting point, then draw pipes to your various appliances.

2

Set Appliance Loads

Tap on any node to open the inspector. Assign the appliance type and its MJ/h load. The tool automatically handles the math for total run distances.

3

Auto-Size & Export

Click calculate. GasCalc instantly sizes every pipe segment to maintain the required allowable pressure drop, then exports the results to your formal PDF report.

Legislative Framework

AS/NZS 5601.1:2022, Clause 5.2.4 & Table 5.2.4: Sizing shall ensure adequate gas supply to appliances, maintaining minimum inlet pressures of 1.13 kPa (NG) or 2.75 kPa (LPG).

Appendix F.1.1 & F.1.4: The calculator sizes consumer piping by automating the equations outlined in AS/NZS 5601.1:2022 Appendix F. It utilizes "an algorithm based on the Churchill's friction factor equation" in conjunction with the fundamental isothermal flow calculation for compressible fluids.

Appendix F.1.6 & F.1.7: Velocity threshold monitoring and allowable pressure drop verification.

Regulatory Enforcement (Australia): The use of AS/NZS 5601.1 is legally prescribed for gas installations under the Gas Safety (Gas Installation) Regulations 2018 (Victoria) Regulation 14(1)(a), the Gas Standards (Gasfitting and Consumer Gas Installations) Regulations 1999 (WA) Regulation 32(1)(b), and the Gas Regulations 2012 (South Australia) Regulation 37(1)(b).

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