Total load of 1170 CFH, see attached roof plan and riser. Furthest RTU is 200' from the meter. Lengths of the branches on dwg
How do we determine which chart to use 402.4---(1) , (2) or (3). If we can reduce the gas pressure to any of these charts then are we allowed to use any or smallest pipe possible or is there a code requirement.
Standard equipment, RTU's and a gas fired heater.
Adjacent suite is similar. Their load is 760 MBH, with 5 RTU's and two water heaters.
Their meter reads 630 CFH at 1/2" diff, 1320 CFH at 2" diff. MAOP 25 psi, main is sized at 3" and furthest equipment is 150'
Incoming main is 1-1/2"
If sized using chart 402.4(2), will this work?