Is it true that modified existing standpipe systems do not require hydrostatic testing for the new piping?

Modified existing standpipe systems must undergo hydrostatic testing for the new piping to ensure that they meet safety and performance standards. Hydrostatic testing is a critical procedure that checks for leaks and verifies the integrity of a piping system under high pressure. This testing is essential, even for modifications, because it ensures that any new addition integrates seamlessly with the existing system and maintains its overall reliability during an emergency.

Performing hydrostatic testing on modified systems helps to detect any issues that could compromise the system's function, particularly in a fire emergency when the standpipe system needs to deliver water effectively and reliably. Therefore, the requirement for testing applies universally to any new piping that is added to ensure safety compliance and reduce risks.