HVAC Pipe Sizer - Gas Plus

HVAC Pipe Sizer - Gas Plus

High/Low press. gas pipe calcs

1 ratings
5 reviews
$7.99
In-App Purchases

Details

  • Released
  • Updated
  • December 5, 2009
  • December 12, 2025

Features

HVAC Pipe Sizer - Gas Plus screenshot #1 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #2 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #3 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #4 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #5 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #6 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #7 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #8 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #9 for iPhone
HVAC Pipe Sizer - Gas Plus screenshot #10 for iPhone
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About

Calculate gas piping systems for low and high pressure. Input flow, pressure, or diameter to find pipe sizes, velocity, and equivalent lengths. Supports English and metric units, with extensive pipe fitting data.

Low and high pressure gas pipe sizing
Calculate flow, pressure drop, diameter, and velocity
Universal app for iPhone and iPad
English and metric unit support
Built-in pipe fitting equivalent length tables
Slider controls for quick adjustments
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What's New in HVAC Pipe Sizer

5.2

December 12, 2025

1. Added a Share button to the iPhone and iPad versions of the app, so you can now text, email, and download reports. 2. Updated help. 3. Optimized for iOS 26.

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In-App Purchases

$9.99

HVAC Equipment Locator

This in-app purchase allows you to add an unlimited # of customized inputs for buildings, equipment, and maintenance items. It also allows you to add more than 5 photos or 1 document for each building, equipment, and maintenance item.

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User reviews

Crap

Load of crap all in wg no millibar settings and useless. Not worth the money.

Good simple tool for gas pipe sizing

I mainly do high pressure gas pipe sizing for my job at a processing plant. This handy little tool helps me spot check the velocities, diameters, etc. for some of those pesky pipes that are giving me troubles.

This app is quite versatile since it allows me to first specify gas flow and then upstream/downstream pressures to get predicted diameters and velocities. It also allows me to specify diameters and pressure loss to get gas flows.

Great app!
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Great value and useful for HVAC techs

Simple interface. Good tools for sizing low and high pressure
gas piping. I have used this app in the field to guestimate the size
of natural gas piping into homes. Quite accurate. I've already gotten
3 or 4 updates since I bought the app and they were all very useful
updates, not just bug fixes. I see Carmel as a long-term company, not
just a fly-by-night. Good work!
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Good stuff

High pressure calcs: Good stuff and accurate after comparing to the Waymouth equations that I have programmed into my Excel spreadsheet.

Low pressure calcs: These calcs appear accurate. I use this the most to look at natural gas piping into homes, etc.



Useful app

This is very useful for my business involved with process piping. I often go into the field and need to do some quick calcs of gas flow rates based upon the pipe diameter. The calcs are quite accurate after comparing to my desktop-based calcs. I use the high-pressure calcs more than the low-pressure, but they both seem accurate.

Great work.

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Developer apps

FAQ

What types of gas pressure does HVAC Pipe Sizer support?

HVAC Pipe Sizer - Gas Plus supports both low pressure (less than or equal to 1.5 psi) and high pressure (greater than 1.5 psi) gas piping systems.

What information can I input to size a gas pipe?

For low pressure, you can input total gas flow and either pressure drop, pipe internal diameter, or gas velocity. For high pressure, you input total gas flow, upstream pressure, and either downstream pressure, pipe internal diameter, or gas velocity.

What results does HVAC Pipe Sizer provide?

The app provides exact and nominal pipe diameters, calculated velocity, and total pipe equivalent length. It can also derive gas flow if you input existing pipe dimensions.

Can I use HVAC Pipe Sizer on my iPad?

Yes, HVAC Pipe Sizer - Gas Plus is a universal app that works on both iPhone and iPad, adjusting its screen size accordingly.

Does HVAC Pipe Sizer have ads?

No, HVAC Pipe Sizer - Gas Plus does not contain advertisements. It is a paid application.

How often is HVAC Pipe Sizer updated?

The latest version, 5.2, was last updated on December 12, 2025, indicating regular updates to maintain functionality and compatibility.

What is the price of HVAC Pipe Sizer?

HVAC Pipe Sizer - Gas Plus is available for a one-time purchase of $7.99.

What other HVAC apps does Carmel Software Corporation offer?

Carmel Software Corporation also offers HVAC Residential Load Calcs, HVAC Quick Load Plus, HVAC Quick Load, and HVAC Toolkit for iPhone and iPad.