# ISO-5167 — ISO-5167 Orifice Calculations

> ISO-5167 Orifice Calculations (iPhone/iPad app by Bjarne Berge.)

- Source: https://appshunter.io/ios/app/iso-5167/id1356345079 (this page in markdown: same URL + `.md`)
- Developer: [Bjarne Berge](https://appshunter.io/developer/1209858941)
- Category: Productivity, Utilities
- Price: $0.99 (on sale, was $6.99)
- Age rating: 17+
- Requires: iOS 15.6 · 1 MB
- Languages: Canadian English
- Released: 2018-03-07
- Data updated: 2026-07-04
- User reviews in markdown: https://appshunter.io/ios/app/iso-5167/id1356345079/reviews.md

## What is ISO?

ISO-5167 Orifice calculates size, flow-rate or pressure drop for gas and liquid flow orifice meters based on the International Standard Organization's ISO-5167.
Orifice Size is calculated from given flow-rate and pressure drop, Flow-rate is calculated from given size and pressure drop and Pressure Drop requires orifice size and flow-rate.  
Different taps can be selected: Flange Taps, D and D/2 or Corner taps. 
Fluids include gases: Natural Gas (Specific Gravity must be provided), Air and Nitrogen, or liquids: Crude Oil, Water, Methanol, Mono-ethylene Glycol, Diethylene Glycol and Triethylene Glycol.  
In addition, selecting orifice material will adjust the sizing parameter of the orifice depending on temperature.
Customary (US-units) or SI-units can be selected.


## Version history (last 5 releases)

### 6.0 — 2026-01-26

Updated with Xcode 26

### 5.0 — 2024-03-05

Updated with Xcode 15 to IOS 17.

### 4.1 — 2022-03-08

Updated to IOS 15.

### 4.0 — 2020-10-25

Upgraded to SDK 13
Added 'Share' button to enable sharing, saving, printing of results
Changed color-scheme to work in Dark Mode
Updated layout and fonts to work better with iPads (better layout/larger fonts)

### 3.0 — 2019-05-19

Updated to include Liquids (Crude Oil, Water, Methanol, MEG, DEG and TEG) in addition to gases (Natural Gas, Air and Nitrogen).
Bug Fixes.

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## More apps by Bjarne Berge

- [Gas-Liquid Leak](https://appshunter.io/ios/app/gas-liquid-leak/id1209858942)
- [AGA-3 Orifice](https://appshunter.io/ios/app/aga-3-orifice/id1350504597)
- [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 2026-07-04.*