We are getting a plumbing department reviewer's comment that the combined sprinkler/domestic water service cannot exceed a flow of 5 feet per second.
Their justification is that flow above 5 ft/s will negatively impact the "coating" on the inner surface of the copper pipe.
I've never heard of such a concern, and 5 ft/s is far slower than the hydraulic calculations can support. This is for small diameter services on an NFPA 13R project that is 3 stories in height.
The difference in tap fees between a 2-inch combined service (with an automatic domestic shutoff in this case) and a 3-inch ductile iron is at least ten thousand to the owner.
Is there some truth or justification to limit fire sprinkler flow to 5 ft/s on copper pipe?
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