NFPA 13 2013 is the applied standard. I have a location with outside canopies protected by a dry pipe system. They have removed the solid panels covering the canopies and installed translucent panels covering the top now. A informal temperature measurement survey was done at the level of the existing sprinkler heads and it topped out at 102 degrees. It was not the hot part of the year when this survey was done outside temperatures reached a high of 75 that day. We are looking to change the existing 155 degree 5.6K upright sprinkler heads to 200 degree 5.6K upright sprinkler heads (Same manufacturer Same type). We are having to send the drawings through the state fire marshal's office for review per the local AHJ. The state is requesting Hydraulic Calculations per 2013 NFPA 13 – 23.3 for the review. There are not drawings of most of the system to allow full recreation for calculations without an extensive survey of the location. Is it the intent of 2013 NFPA 13 – 23.3 to require calculations for something that does not change the hydraulics of the system?
Pye Barker Fire Safety