On what basis shall system demand for class 2 standpipes be established?

The system demand for class 2 standpipes should be established based on standards at the time of installation. This approach is critical because it ensures compliance with the codes and regulations that were applicable when the standpipe system was originally designed and installed. Fire safety systems, including standpipes, must adhere to the specific requirements in effect at the time of installation to ensure that they are adequate for the intended protection and functionality.

Using historical averages or present standards may not accurately reflect the original expectations and guidelines that governed the performance and requirements of the standpipe system when it was first put into service. Manufacturer recommendations, while valuable, should also be viewed within the context of the standards that were in effect at the time the system was installed, as they may be updated over time and not applicable to older systems. This ensures that the analysis and determination of system demand are both accurate and compliant with the original installation standards.