# Gas-Liquid Leak — Gas-Oil-Water Leak Calculation

> Calculates gas, oil, and water leak rates from piping and vessels. (iPhone/iPad app by Bjarne Berge.)

- Source: https://appshunter.io/ios/app/gas-liquid-leak/id1209858942 (this page in markdown: same URL + `.md`)
- Developer: [Bjarne Berge](https://appshunter.io/developer/1209858941)
- Category: Productivity, Utilities
- Price: $0.99
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 17+
- Requires: iOS 13 · 1 MB
- Languages: American English
- Released: 2017-03-01
- Data updated: 2026-09-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gas-liquid-leak/id1209858942/reviews.md

## What is Gas?

Gas-Liquid Leak provides quick and accurate estimates of leak-rates of Natural Gas, Crude Oil or Water from piping and tanks/vessels given hole-size (or seal-leak) with given operating pressure and temperature, assuming the leak is to the atmosphere. 
The Gas-Liquid Leak app is provided as a tool for use in oil and gas pipelines, pipes or vessels/tanks or offshore oil and gas installations.  The app gives quick and accurate estimates of leak rates of gas, oil and water from piping and equipment cracks, holes, seals directly on your iPhone without having to run simulations on a computer.

For natural gas the assumption is that the pressure difference across the leak-point (hole) is large enough to cause critical flow across the hole. Flow-rate is calculated based on restriction orifice correlations, i.e., sonic velocity exists at the leak-point orifice and further decrease in the upstream and downstream pressures ill not change the leak-rate. 

For liquids, critical (choked) flow occurs when a cavitation barrier exists across the leak-point (hole) and the downstream pressure (atmospheric) is below the liquid vapor pressure. At this point the liquid will start to flash into bubbles of vapor. For crude oil below about 35 degree and water, the vapor pressure will normally be less than atmospheric pressure.  Therefore, in this app, if vapor pressure is found to be lower than atmospheric pressure, the flow-rate is calculated based on control valve pressure drop calculations as defined in the documentation of the app (download from URL).

The app also lets the user select US-Customary or SI-Metric units.

## Key features

- Leak rate estimation
- Natural gas, crude oil, water
- Piping and tank leaks
- US-Customary or SI-Metric units
- Atmospheric leak assumption
- Critical flow calculations

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/gas-liquid-leak/id1209858942/reviews.md

### 5/5 — useful app

*2021-09-29*

Dear sir,

Could you help to add some popular gases inside? like methane, H2s, H2. Thank you very much.

## Frequently asked questions about Gas

### What types of leaks can Gas-Liquid Leak calculate?

Gas-Liquid Leak can calculate leak rates for natural gas, crude oil, and water. It estimates leaks from piping and tanks/vessels, assuming the leak is to the atmosphere.

### Does Gas-Liquid Leak support different measurement units?

Yes, the app allows users to select between US-Customary or SI-Metric units for their calculations, providing flexibility for different regional standards.

### Can I use Gas-Liquid Leak offline?

The provided data does not specify offline functionality. However, as a calculation tool, it is likely designed to function without an internet connection once installed.

### What is the price of Gas-Liquid Leak?

Gas-Liquid Leak is a paid application, priced at $0.99. This one-time purchase grants access to its leak calculation features.

### What devices is Gas-Liquid Leak compatible with?

Gas-Liquid Leak is compatible with iPhone, iPad, and iPod devices, making it accessible to a wide range of Apple users.

### How often is Gas-Liquid Leak updated?

The app was last updated on January 26, 2026, indicating recent development activity. The version number is 9.0.

### What is the age rating for Gas-Liquid Leak?

Gas-Liquid Leak has an age rating of 17+, suggesting it is intended for mature audiences due to the nature of its industrial application.

### Does Gas-Liquid Leak have ads?

No, Gas-Liquid Leak does not contain advertisements. The app is ad-free, providing an uninterrupted user experience.

## Version history (last 5 releases)

### 9.0 — 2026-01-26

Minor Bug-fixes

### 8.0 — 2025-12-09

Updated with Xcode 26.
Minor Bug-fixes

### 7.0 — 2021-02-17

Upgraded to latest IOS SDK
Added 'Share' button to enable sharing, saving, printing of results
Changed color-scheme for Dark Mode
Updated layout and fonts to work better with iPads (better layout/larger fonts)

### 6.0 — 2019-09-19

New version upgraded to also include Crude Oil and Water Leak calculations in addition to Natural Gas.

### 4.0 — 2018-03-04

Minor bug-fix.

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## More apps by Bjarne Berge

- [AGA-3 Orifice](https://appshunter.io/ios/app/aga-3-orifice/id1350504597)
- [ISO-5167](https://appshunter.io/ios/app/iso-5167/id1356345079)
- [Gas-Liquid RO](https://appshunter.io/ios/app/gas-liquid-ro/id1374664837)
- [Line-Fit](https://appshunter.io/ios/app/line-fit/id1448053643)
- [Curve-Fit](https://appshunter.io/ios/app/curve-fit/id1450077815)

All apps by Bjarne Berge: https://appshunter.io/developer/1209858941

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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 2026-09-10.*