# ROL Assistant

> Refining advisor, unit converter, steam properties, and pressure drop calculator. (iPhone/iPad app by Astron International, Inc..)

- Source: https://appshunter.io/ios/app/rol-assistant/id775678395 (this page in markdown: same URL + `.md`)
- Developer: [Astron International, Inc.](https://appshunter.io/developer/775678398)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 11.4 · 28 MB
- Languages: English
- Released: 2013-12-18
- Data updated: 2026-07-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rol-assistant/id775678395/reviews.md

## What is ROL Assistant?

ROL Sia: Sia virtual advisor on Refining Online®. Ask Sia your refining question for answers from the Refining Online Q&A.

Unit Conversion: Length, Area, Volume, Mass, Density, Pressure, Energy, Power, Temperature, Flowrate, Viscosity, Specific Energy, Heat Flux, Heat Transfer Coefficient, Thermal Conductivity...

Steam Properties: Enthalpy, Density, Heat Capacity, Viscosity, Thermal Conductivity of saturated steam, water, and superheated steam.

Line Pressure Drop: Single phase line pressure drop calculation for different pipe sizes and materials in English or Metric units.

## Key features

- Virtual refining advisor
- Extensive unit conversions
- Steam properties calculator
- Line pressure drop calculation
- English and Metric units


## Frequently asked questions about ROL Assistant

### What is ROL Assistant?

ROL Assistant is a utility app that acts as a virtual advisor for refining questions and provides tools for unit conversion, steam properties, and line pressure drop calculations.

### What types of unit conversions does ROL Assistant offer?

ROL Assistant supports conversions for Length, Area, Volume, Mass, Density, Pressure, Energy, Power, Temperature, Flowrate, Viscosity, Specific Energy, Heat Flux, Heat Transfer Coefficient, and Thermal Conductivity.

### Can ROL Assistant calculate steam properties?

Yes, ROL Assistant can calculate Enthalpy, Density, Heat Capacity, Viscosity, and Thermal Conductivity for saturated steam, water, and superheated steam.

### Does ROL Assistant help with pressure drop calculations?

Yes, it performs single-phase line pressure drop calculations for different pipe sizes and materials, supporting both English and Metric units.

### What devices is ROL Assistant available on?

ROL Assistant is available on iPhone and iPad devices.

### What is the age rating for ROL Assistant?

ROL Assistant has an age rating of 4+, making it suitable for a wide range of users.

### How often is ROL Assistant updated?

The latest version is 1.0.30, and the app was last updated on February 18, 2026. This indicates a history of regular updates.

### Does ROL Assistant have ads?

No, ROL Assistant does not contain advertisements.

## Version history (last 5 releases)

### 1.0.31 — 2026-06-26

General Improvements.

### 1.0.30 — 2026-02-18

General imprvoments and iOS26 adaptation.

### 1.0.29 — 2026-01-18

Age rating updation.

### 1.0.28 — 2025-07-23

General Improvements.

### 1.0.27 — 2024-07-31

General Improvments.

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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.*