My house's 70' of iron natural gas piping is mostly 1-1/4" tapering to 1" at the end. It is oversized, because original plan included a 190k btu on-demand water heater that will never be installed & only a gas range and a 60k btu furnace are connected. I want to extend the piping 5' to a gas log burner which wants 110-130K btus. But the route is super tight, and 1/2" flexible CSST is the only reasonable logistical choice. Per a length schedule for my local utility I would need 3/4" pipe to provide the btu capacity at that length. But could the 1/2" coming off of 1" for just 5' be enough?
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source https://hvac-talk.com/vbb/showthread.php?2222149-Gas-Piping-Capacity-Question&goto=newpost
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