Visual Pipe Sizing Calculator

Stop risking compliance failures on manual math and generic tables. GasCalc transforms complex multi-branch layout sizing via AS/NZS 5601.1 Appendix F equations into a rapid, error-free digital workflow.

Multi-Branch Visual Drawing Tool
Automatic Pressure Drop Sizing
AS/NZS 5601.1 Appendix F Equations
Inspector-Ready PDF Reports
See How It Works

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).
  • Extensive Material Database: Beyond Type A Copper, GasCalc supports sizes exceeding standard tables. Select from exact manufacturer data for PE-X & Multilayer Composite Pipes (GasPex, Austec, Forza, DuoPEX, Auspex, UNIPEX, Ezipex, Sharkbite, Gastite/FlashShield, OmegaFlex) and Stainless Steel Press-Fit (EuroPress) permitted by Clause 5.2.4(b).

Customizable Materials & Shopping Lists

Customize your workspace by toggling off materials and specific pipe sizes you don't typically use. When calculated, the tool automatically generates a consolidated shopping list detailing the exact material, DN size, and total meters required.

This shopping list and your step-by-step mathematical audit trail are instantly added to your project report in the Saved Report Manager, which you can easily save, print, or email to suppliers, clients, and Technical Regulators.

Seamless Project Workflow

Pipe size the entire installation visually by drawing your pipe lengths and adding appliances. Select from our massive database of materials—including copper, stainless steel, and composite pipes like GasPex, Sharkbite, or Gastite, utilizing exact manufacturer data.

Once sized, easily push your piping sections to the Tightness Testing calculator to automatically determine test times and pressures. From there, push to the Purging calculator to instantly calculate precise purge volumes and nitrogen requirements.

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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