# HVAC Pipe Sizer - Gas High

> Calculates high-pressure gas pipe sizes based on flow, pressure, and pipe properties. (iPhone/iPad app by Carmel Software Corporation.)

- Source: https://appshunter.io/ios/app/hvac-pipe-sizer-gas-high/id341828523 (this page in markdown: same URL + `.md`)
- Developer: [Carmel Software Corporation](https://appshunter.io/developer/317970398)
- Category: Utilities, Business
- Price: $4.99
- Rating: 5.00/5 from 3 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 17 MB
- Languages: American English
- Released: 2009-12-04
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/hvac-pipe-sizer-gas-high/id341828523/reviews.md

## What is HVAC Pipe Sizer?

The "HVAC Pipe Sizer - Gas High" application allows you to quickly size a simple high pressure (> 1.5psi) gas piping system by inputting a number of piping and gas properties.

This is now a universal app that works on both the iPhone and iPad and sizes the screen size accordingly.
 
You can specify the total gas flow in ft^3/hr (m^3/hr), the upstream pressure (psig or kPa), and one of either downstream pressure (psig or kPa), 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, the upstream pressure, and one of either downtream pressure 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.

This 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.

This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539 

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

## Key features

- High-pressure gas pipe sizing
- Input flow, pressure, and pipe parameters
- Calculate exact/nominal diameters
- Determine velocity and equivalent length
- Supports English and metric units
- Includes pipe fitting tables
- Universal app for iPhone and iPad

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/hvac-pipe-sizer-gas-high/id341828523/reviews.md

### 5/5 — Good app

*2010-05-24*

I've been looking for an app like this for a while. Finally
found it and it works great for doing quick take-offs in the office.
Good work.

### 5/5 — I like it a lot

*2010-05-16*

Carmel has really done a nice job designing this and other apps. So simple yet contains lots of good functionality to truly make it useful in the field and office.

I'm always a little skeptical of these engineering apps because you never know how well they really work on these little iPhone screens, but sometimes simple is better. 

So far, the results appear to be quite accurate and even the fitting equivalent lengths for the different pipe materials look correct. 

I use this app a couple times a week so it's more than paid for itself.

### 5/5 — Impressive

*2010-05-16*

This is the only high-pressure gas piping software app I've found on the Appstore. I'm in the field a lot and this is perfect for doing quick rule-of-thumb calcs on some of the process piping that I often run across. I like that I do not have to input a value into the box, just slide the control. Great effort!

### 5/5 — Easy to use, but I wish it had a little more

*2010-01-04*

This app is very easy to use. I simply slide the input controls, and it updates the results. For example, I can slide the gas flow control to quickly change the cubic ft/hr of gas flow to see how it affects the internal diameter and downward pressure. I can also slide the upstream pressure input slider to see how it affects results.

I wish it allowed you to store info for each "pipe run" so I could build a simple pipe system to see the entire pressure loss, etc. Also, I wish you could email or upload the results somewhere so I could easily plug them into my spreadsheet. Maybe the next version.

Great work, though.

## Frequently asked questions about HVAC Pipe Sizer

### What is HVAC Pipe Sizer - Gas High used for?

HVAC Pipe Sizer - Gas High is a utility application designed to quickly size simple high-pressure gas piping systems. It allows users to input various gas and piping properties to determine key parameters like pipe diameter and velocity.

### What are the key inputs for HVAC Pipe Sizer - Gas High?

You can specify total gas flow, upstream pressure, and one of either downstream pressure, pipe internal diameter, or gas velocity. Additional parameters like gas type, pipe material, and length can also be entered.

### What outputs does HVAC Pipe Sizer - Gas High provide?

The application provides the exact and nominal pipe diameters, calculated gas velocity, and the total pipe equivalent length. It also offers an option to derive gas flow and other properties if analyzing an existing system.

### Does HVAC Pipe Sizer - Gas High support different units?

Yes, HVAC Pipe Sizer - Gas High allows you to choose to display values in either English or metric units, making it versatile for different regional standards.

### What kind of pipe fitting data is included?

This application includes built-in pipe fitting equivalent length and nominal pipe sizing tables for a wide variety of pipe material types and diameters, simplifying the calculation process.

### Is HVAC Pipe Sizer - Gas High available on multiple devices?

Yes, HVAC Pipe Sizer - Gas High is a universal app that works on both the iPhone and iPad, adjusting its screen size accordingly for an optimal user experience on each device.

### How often is HVAC Pipe Sizer - Gas High updated?

The latest version of HVAC Pipe Sizer - Gas High is 4.77, which was last updated on December 3, 2025. This indicates a commitment to maintaining and improving the application.

### What is the price of HVAC Pipe Sizer - Gas High?

HVAC Pipe Sizer - Gas High is a paid application priced at $4.99. It is a one-time purchase with no in-app purchases or subscriptions required.

## Version history (last 5 releases)

### 4.77 — 2025-12-03

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.

### 4.5 — 2023-03-10

1. Optimized for iOS 16 and iPhone 14
2. Updated help

### 4.2 — 2021-11-12

Minor UI update

### 4.1 — 2021-11-04

1. Optimized for iOS 15 and iPhone 13
2. Updated help

### 3.8 — 2020-08-03

Updated Google Analytics and Crashlytics

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## More apps by Carmel Software Corporation

- [HVAC Duct Sizer](https://appshunter.io/ios/app/hvac-duct-sizer/id317970395)
- [HVAC Pipe Sizer - Liquid](https://appshunter.io/ios/app/hvac-pipe-sizer-liquid/id325069065)
- [HVAC Pipe Sizer - Steam](https://appshunter.io/ios/app/hvac-pipe-sizer-steam/id336112747)
- [Steam Tables](https://appshunter.io/ios/app/steam-tables/id339948012)
- [HVAC Pipe Sizer - Gas Low](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-low/id341688321)

All apps by Carmel Software Corporation: https://appshunter.io/developer/317970398

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*