What is the maximum unsupported length of an arm over if the system pressure exceeds 100 psi?

The maximum unsupported length of an arm over when the system pressure exceeds 100 psi is determined by industry standards and codes designed to ensure the safety and effectiveness of sprinkler systems. In this case, when the system pressure is above 100 psi, the span that can be unsupported is limited to 12 inches. This restriction is put in place because higher pressures increase the risk of stress on the pipe, which can lead to failure if spans are too long without proper support. Ensuring that there is adequate support for piping under higher pressures is essential to maintaining system integrity and preventing leaks or damage. Choosing a span that exceeds this limit could compromise the entire system, making proper adherence to these guidelines crucial for safety and functionality.