We have a project in an old building (historic city) that has 3/4-inch branch pipe in their sprinkler system. We've recommended, based on good practice, to change these out for minimum 1-inch due to the potential of obstructions, and that NFPA 13 has not recognized 3/4-inch branch pipe for over 50 years now.
The client is pushing back asking for a reference stating that 3/4-inch lines need to be replaced. I cannot find anything in NFPA standards which would "require" it.
Do you have any helpful references on this that would help educate the client here?
Thanks in advance.
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