# PetroFrac — Petroleum Property Calculator

> Calculates refinery petroleum fraction properties from distillation and API gravity data. (iPhone/iPad app by Richard H Street.)

- Source: https://appshunter.io/ios/app/petrofrac/id954888337 (this page in markdown: same URL + `.md`)
- Developer: [Richard H Street](https://appshunter.io/developer/954888336)
- Category: Utilities, Reference
- Price: $1.99
- Rating: 5.00/5 from 3 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 3 MB
- Languages: English
- Released: 2015-01-11
- Data updated: 2026-08-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/petrofrac/id954888337/reviews.md

## What is PetroFrac?

PetroFrac calculates properties of refinery petroleum fractions based on the D86 distillation and API gravity.   You enter the 10%, 50% and 90% D86 distillation temperatures along with the API gravity.

The program calculates:

SG, Specific gravity
Watson K
MW, molecular weight

Once you enter the flow temperature the program calculates:

Density at flow temperature, g/cm3
Viscosity at flow temperature, cSt
Cp, Heat capacity at flow temperature, BTU/(lb Deg F)
H Liquid, Enthalpy of liquid at flow temperature, BTU/Deg F
H Vapor, Enthalpy of vapor at flow temperature, BTU/Deg F
Heat Vap, Heat of vaporization at flow temperature, BTU/Deg F

Any values that are extrapolated beyond the ranges of the correlations are displayed in purple text.

The calculations are based on:

“New correlation for predicting the viscosity of heavy petroleum fractions”
H. M. Moharam, R. A. Al-Mehaideb and M. A. Fahim
Fuel vol. 74, 1995.  
I have extended the correlation range using ASTM Designation: D341 – 93 (Reapproved 1998).

“New correlation predicts density of petroleum fractions”
Jose Vicente Gomez, Oil and Gas Journal, July 13, 1992

“Improve Predicted Enthalpy of Fractions”
M. G. Kesler and B. I. Lee
Hydrocarbon Processing 55, No. 3

American Petroleum Institute
Technical Data Book – Petroleum Refining

## Key features

- Calculate specific gravity
- Calculate Watson K
- Calculate molecular weight
- Calculate density at flow temperature
- Calculate viscosity at flow temperature
- Calculate heat capacity
- Calculate enthalpy

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/petrofrac/id954888337/reviews.md

### 5/5 — straightforward and handy

*2015-01-23*

I needed to do some pressure drop calculations to check if we could use a transfer line.  This tool allowed my to calculate the naphtha viscosity and specific gravity.  This was pretty handy, since I didn’t have to run Hysis to calculate the properties.  It’s a pretty simple application, but it does exactly what I need.

### 5/5 — Very Handy

*2015-01-12*

This is exactly what I was looking for.  It's great for meter calculations.

## Frequently asked questions about PetroFrac

### What properties does PetroFrac calculate?

PetroFrac calculates specific gravity, Watson K, molecular weight, density, viscosity, heat capacity, and enthalpy for refinery petroleum fractions. It uses D86 distillation temperatures and API gravity as inputs.

### How does PetroFrac handle extrapolated data?

Any values that are extrapolated beyond the ranges of the correlations used in PetroFrac are displayed in purple text. This helps users identify data that may be less precise.

### What is the price of PetroFrac?

PetroFrac is a paid application priced at $1.99. This one-time purchase grants access to all its calculation features.

### On which devices can I use PetroFrac?

PetroFrac is available for iPhone, iPad, and iPod touch devices. It is designed for iOS users.

### How often is PetroFrac updated?

The latest version of PetroFrac is 1.9, last updated on September 28, 2023. This indicates regular maintenance and potential feature additions.

### What is the age rating for PetroFrac?

PetroFrac has an age rating of 4+, making it suitable for a wide range of users. It does not contain mature content.

### Does PetroFrac have ads?

No, PetroFrac does not contain advertisements. As a paid application, it offers an ad-free experience for its users.

### What scientific correlations are used in PetroFrac?

PetroFrac's calculations are based on established correlations for viscosity, density, and enthalpy of petroleum fractions, including research published in Fuel and Oil and Gas Journal, as well as the American Petroleum Institute Technical Data Book.

## Version history (last 5 releases)

### 1.95 — 2026-07-30

Updated to support Dark Mode

### 1.9 — 2023-09-28

Updated for current version of iOS.

### 1.8 — 2020-07-29

Updated for iOS 13.

### 1.7 — 2019-05-03

Minor bug fixes and cosmetic changes

### 1.6 — 2018-04-22

Bug ixws and updated to latest version of iOS.

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## More apps by Richard H Street

- [PIDTune](https://appshunter.io/ios/app/pidtune/id1045174726)
- [SourDoughWaterTemperature](https://appshunter.io/ios/app/sourdoughwatertemperature/id6745718336)

All apps by Richard H Street: https://appshunter.io/developer/954888336

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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 2026-08-01.*