Engineering firm (building services engineering planning) seeks calculation software

We are an engineering firm based in northern Germany (specializing in technical building equipment and building services) and are looking for calculation software.

The software should meet the following requirements:

• Pipe network calculation (e.g., length, dimensioning) Fire extinguishing systems with inert gases, e.g., nitrogen (e.g., fire extinguishing systems in data centers, server rooms)
• Windows-compatible
• Support for mobile devices is not necessary

One to two software workstations are planned.