What is the maximum engine pressure allowed for older standpipe systems when supplying the FDC?

The maximum engine pressure allowed for older standpipe systems when supplying the Fire Department Connection (FDC) is 175 PSI. This standard is rooted in ensuring that the pressure delivered to the standpipe system does not exceed the design limitations set forth by the manufacturers and to minimize the risks associated with excessive pressure, such as potential damage to the system’s components, hoses, and fittings. Older standpipe systems often have less tolerance for high pressures and can be prone to leaks or catastrophic failures if pushed beyond their limits. It's important for fire service professionals to adhere to this maximum pressure to ensure the safety and functionality of the standpipe system during firefighting operations.