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Gas Load Pressure Drop Question
I asked a question here a year or two ago trying to understand pressure drop on gas systems, I'm hoping someone could help me with a little more thorough understanding on which table to use in the IFGC when do load calcs for pre-existing residences. These would be when we would need to submit a gas load for the addition of a tankless, gas stove...ect
For Black Iron I've always used IFGC 402.4(2) unless the inlet gas pressure is above 8", 11" or 2psi
I was speaking with a very knowledgeable inspector yesterday who made me re-think my idea's on which pressure drop tables to use. Please correct me if my new understanding is wrong.
Incoming NG pressure = 7"w.c.
Min W/H input = 5" w.c.
Min Furn input = 4.5" w.c
Pressure Drop = 2" w.c.
Would that mean my allowable pressure drop is the difference between the incoming pressure and the appliance with the highest minimum supply pressure? or a calculation between the two?
Meaning, would I have a 2" allowable pressure drop for deciding which gas pipe sizing table to use?