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Natural gas line sizing question.

5K views 11 replies 2 participants last post by  240sx4u 
#1 · (Edited)
I have natural gas in my home. I have a natural gas furnace in the house AND in the garage 45k btu. I use natural gas for my dryer as well. I would like to install a natural gas cooktop in the kitchen but don't want to create a situation where I end up with undersized gas lines running from the meter into the house. Everything plumbing wise is right under the kitchen. My oven is electric.

Is there a table I can use to calculate needed pipe size by btu's used? I am not sure I am up to the task of this installation. I am capable but after seeing someones home vaporized by a gas leak earlier this year I am afraid to do it myself. I just need to know if the run into the basement is going to be adequate or if I should just sell the cooktop I got and get an electric one!

EDIT; This cooktop will draw about 43,000 btu if every burner was on full tilt.

Thanks guys.

Evan
 
#8 ·
Mark, The order of appliances goes;

H/W heater 12' from meter (looks like 1" pipe)

Furnace (2' from HW to here) (same 1")

Dryer is about 16' further down the line on 3/4", which necks down right after the furnace drop.

Garage heater (60ft of 3/4" pipe including bend calculation if memory serves)


Thanks Mark; Luckily the room that has the gas line run from the meter is drop ceiling so if I need to have that part replaced it won't destroy the house.

Evan
 
#9 ·
Ok Heres what I come up with,

Entering pressure (based on normal residential pressure) - 16" WC
Gas SG - .6
OA of pipe - 125' (added 25% for fittings)
Pipe Size Worse Case 3/4" Sch 40 - ID - .824"
Pressure Drop to Last Device 2" WC
Available Gas - 309 CFH
Required Gas - 245 CFH
Pressure Drop at 245 CFH - 1.2"

Results, Line size will not require any modifications.

Mark
 
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