FAQ – Frequently asked questions

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Yes, CSE PROSaR offers a free trial period of two weeks. During this time, you can explore and try out the functions of the standard modules without any obligation.

No, CSE PROSaR is a web-based application and requires an internet connection.

To use CSE PROSaR, a license agreement must be established. The license specifies the number of users authorized per customer. Access to the application is assigned to individual users; the customer is responsible for managing and authorizing their users.

Users can register independently at www.cse-prosar.de and use the application without any installation.

License agreements are typically valid for 12 months.

Yes, CSE PROSaR can be provided under a company license that enables access for all authorized employees. For detailed information and individual offers, please contact us directly at support@cse-prosar.de.

Currently, calculations for safety valves and rupture discs can be performed. In the Standard Edition, the “Sizing” and “Review” modules can be used. The Advanced Edition includes the “Review” module for all available valve types.

The “Sizing” module is used for the new sizing of a valve based on process conditions. It provides a specific suggestion for a suitable valve, permissible piping lengths, and manufacturer-specific proposals.

The “Review” module is used to validate existing valves. It calculates the dischargeable mass flow/volume flow and the resulting pressure losses, and checks whether they comply with the relevant standards.

The Standard Module can be used for simple designs for valves with single-phase flows, meaning either gas/steam or liquid. The definition of piping is simplified.
With the Advanced Module, in addition to single-phase flows, two-phase flows (gas and liquid mixtures) can also be calculated. The methodology for pure gas flows also differs from the Standard Module, as real gas effects are considered. Piping can be taken into account in detail.

On each module page, you will find a question mark icon at the top right corner that leads you to instant help. By clicking on the section “Data Required,” you will receive an explanation for each input field.

For safety valves, data from Leser, IMI Bopp&Reuther, Goetze, Herose, and Richter are available. For rupture discs, data from Rembe and Striko are available.

You can also manually input custom valves and perform calculations. The essential parameters needed are nominal size and characteristic values (KR- / Kd-value).

<p>If your fluid is not listed in the CSE PROSaR database, you can still perform the calculation by manually entering the required material data (e.g., density, heat capacity, vapor pressure, etc.) under your operating conditions.</p>
<p>To do this, go to the “Fluid” section and select “Custom Data.” There, you can individually enter all relevant material data.</p>

Important Notes:

• Custom substance data is treated as constants by CSE PROSaR. Users must decide whether using constant substance data is acceptable for their application.
• Two-phase flows cannot be calculated using custom substanc data.
• Ensure that the manually entered material data matches the given process conditions to obtain meaningful results.

Yes. All fluids in the CSE PROSaR database have a valid range for pressure and temperature. If values outside the valid range are entered, PROSaR will stop the calculation and issue an error message.

<p>In rare cases, the calculation may not complete – for example, with extreme input values or conditions close to physical limits. The system automatically detects such cases and displays an appropriate message. Whenever possible, CSE PROSaR provides hints about parameters that may have caused the calculation to stop.</p>
<p>If this happens, try slightly adjusting the input values. If the issue persists, please contact support at support@cse-prosar.de.</p>
<p>Describe the situation as accurately as possible and, if possible, attach a file or a screenshot. This helps us quickly analyze and resolve the issue.</p>

If you experience technical issues, you will find a button labeled “Give Feedback” at the bottom right corner. Clicking it allows you to describe your problem and attach a file if needed.

For professional questions regarding the use of CSE PROSaR, please contact the engineering department at support@cse-prosar.de.

The user can select the standard to be used for the calculation (parameter “Certification / Design Equation”). The following standards can be chosen:

• DIN EN ISO 4126-7 (commonly used in Europe)
• API 520 (U.S. standard)

In the Advanced modules, the fluid state automatically determines the calculation model. If CSE PROSaR detects a phase change during the calculation, the appropriate model is automatically selected. The model used is specified in the report.

• DIN EN ISO 4126-10
  Two-phase flows are calculated according to the model in DIN EN ISO 4126-10:2024, which includes an updated omega model (HNE-CSE model).
• DIN EN ISO 4126-7
  Two-phase flows are calculated according to the model in DIN EN ISO 4126-10:2024, which includes an updated omega model (HNE-CSE model).
• Direct Integration Model (DIM)
  Pure gas flows are solved using direct numerical integration. With direct numerical integration, the mass flow is not calculated via simplified analytical formulas (such as those for ideal gases or isentropic flow), but rather by integrating the local flow properties along the system.
  The main advantage is that real thermodynamic properties (such as nonlinear pressure-volume behavior, variable specific heats, and compressibility) are taken into account.
  This allows for a significantly more accurate determination of mass flow under real operating conditions, for example, at high pressures, low temperatures, or near phase boundaries, where ideal gas assumptions fail.

You must define whether the fluid is gas, liquid, or two-phase at the moment the safety valve or rupture disc activates.

The normal operating condition is not relevant — only the fluid state at activation must be considered. Effects like flashing must be taken into account.

The standard DIN EN ISO 4126-10:2024 describes a method for this determination.

For support, you can also contact the CSE-Engineering team (Leistungen – CSE-Engineering).