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  • HVAC Pipe Sizer - Gas Low screenshot 1
  • HVAC Pipe Sizer - Gas Low screenshot 2
  • HVAC Pipe Sizer - Gas Low screenshot 3
  • HVAC Pipe Sizer - Gas Low screenshot 4

About HVAC Pipe Sizer - Gas Low

The "HVAC Pipe Sizer - Gas Low" application allows you to quickly size a simple low pressure (less than 1.5psi) gas piping system by inputting a number of piping and gas properties. You can specify the total gas flow in cuft/hr (CubicM/hr) and one of either pressure drop (in. wg or Pa), pipe internal diameter (inches) or gas velocity (ft/s) parameters. The results include both the exact and nominal pipe diameters and the calculated velocity and total pipe equivalent length. If you are analyzing an existing pipe system, there is an option to input the existing pipe internal diameter and one of either pressure drop or gas velocity parameters to derive the calculated gas flow and other remaining properties. You can specify additional parameters such as the type of gas, various properties of the gas, the pipe material type, the total length of pipe, quantities for up to 11 different types of pipe fittings, and much more. You can also choose to display values in either english or metric units. This application includes built-in pipe fitting equivalent length and nominal pipe sizing tables for a wide variety of pipe material types and diameters. The "HVAC Pipe Sizer - Gas Low" application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. You can also manually input exact values. All values can be displayed in English (IP) and Metric (SI) units. This application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. We also offer the following additional applications for the iPhone/iPad: 1. HVAC Duct Sizer 2. HVAC Pipe Sizer – Gas Low Pressure 3. HVAC Pipe Sizer - Gas High Pressure 4. HVAC Pipe Sizer – Liquid 5. HVAC Pipe Sizer – Steam 6. Steam Tables 7. Psychrometric Plus 8. Psychrometric LT 9. HVAC Pipe Sizer Plus 10. HVAC Pipe Sizer Gas Plus 11. HVAC Toolkit 12. HVAC Toolkit Ultimate 13. HVAC Residential Load Calcs 14. HVAC Load Plus 15. HVAC Equipment Locator 16. ASHRAE Duct Fitting Database 17. ASHRAE 62.1 Ventilation Load Calcs 18. HVAC Psych HD 19. HVAC ResLoad-J 20. HVAC Residential Load Calcs HD

What’s new

Version 5.1 · Updated October 12, 2026

1. A modernized interface built around Apple's latest UI/UX guidelines, including a full iPad layout. 2. Reports can be sent as PDF, CSV (Excel), and HTML and by email, text message, or any other Share option. 3. A color picker lets you choose the color of the calculated output values. 4. Fully updated and formatted help. 5. Many smaller refinements throughout.

App privacy

The developer, Carmel Software Corporation, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

Alternatives to HVAC Pipe Sizer - Gas Low

Looking for apps like HVAC Pipe Sizer - Gas Low? Here are 6 similar apps on the App Store. The highest rated is Natural Gas Pipe Size (5.0/5), and 5 of the 6 are free to download.

HVAC Pipe Sizer - Gas Low vs. alternatives
App Rating Price Last updated Compare
HVAC Pipe Sizer - Gas Low 5.0 / 5 (2 ratings) 4.99 USD October 12, 2026
Natural Gas Pipe Size 5.0 / 5 (1) 6.99 USD Mar 19, 2026 Compare
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Johnson Controls CWa 2.5 / 5 (24) Free Jun 22, 2026 Compare
CE HVAC Pro+ 4.7 / 5 (1,598) Free Oct 16, 2026 Compare

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