Orifice and Venturi Flow Meters. ROX™ is a unit operation for orifice and venturi flow meters (ISO 5167) and restriction orifice modelling.

What is ROX™

ROX™ is a process simulator unit operation for Orifice and Venturi Flow Meters and Restriction Orifice Modelling.

ROX™ for can be used in both Steady State and Dynamic Simulations.

Since Orifice and Venturi Flow Meters are not commonly available as standard unit operations in process simulators, if a model or either unit is required, the user currently has to estimate or approximate the operation of this equipment.

This software comes as an extension for Petro-SIM from KBC Advanced Technologies and Aspen HYSYS from AspenTech.

Core Benefits

No user estimate calculations needed

BPT ROX uses the Homogenous Equilibrium Method (HEM) as the general flow calculation method for restriction orifices and uses ISO5167 as the basis for calculation of orifice flow meters and venturi flow meters


ROX™ is not intended to be an orifice plate design tool, but if the user wishes to do a design, he or she can quickly adjust the main dimensions to find an orifice/throat size that fits the needs of the process.

Specification Requirements

Operating System
Windows 7 (64 bit) The software has been tested using Windows 7 (64 bit), but Windows 7 (32 bit) should work as well.
Aspen HYSYS V7.3 (CP3) or later
The software has been qualified with Cumulative Patch 3 installed, but earlier installations of HYSYS V7.3 may also work. Minimum licenses required: HYSYS_Process
Microsoft .NET Framework
.NET Framework 3.5 SP 1 Usually installed as part of HYSYS installation.
Hardware Requirements
BPT ROX has no specific hardware requirements beyond the specifications required for running Aspen HYSYS.

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