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Old 02-11-2011, 10:33 AM   #1
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Natural gas line sizing question.


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


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Old 02-11-2011, 10:47 AM   #2
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Natural gas line sizing question.


What is the furnace btu rating for your house, how about hot water heater?

What is the current line size?

Mark

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Old 02-11-2011, 10:48 AM   #3
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Natural gas line sizing question.


Mark, I knew I forgot something. The hot water heater. I will have to check the BTU rating of those when I get home tonight.

Thanks!
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Old 02-11-2011, 10:50 AM   #4
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Natural gas line sizing question.


Need that for both the hot water and the furnace.
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Old 02-11-2011, 10:50 AM   #5
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Natural gas line sizing question.


Can do, thank you.
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Old 02-12-2011, 07:29 AM   #6
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Natural gas line sizing question.


100,000 btu on the furnace and 32,000 on the water heater.

Thanks.
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Old 02-12-2011, 07:34 AM   #7
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Natural gas line sizing question.


Approximately how long is the line from the meter to the furthest appliance and what is the furthest appliance.

What is the current line size?

Mark
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Old 02-12-2011, 07:41 AM   #8
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Natural gas line sizing question.


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
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Old 02-12-2011, 08:05 AM   #9
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Natural gas line sizing question.


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.

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Old 02-12-2011, 08:08 AM   #10
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Natural gas line sizing question.


Thanks for the information Mark! I really appreciate you taking the time to help me out.
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Old 02-12-2011, 08:20 AM   #11
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Natural gas line sizing question.


I have my own spread sheet to do the calculations but here is a great web site for future reference.

http://www.engineeringtoolbox.com/na...or-d_1042.html

It has alot of information with all the links in one place, so much so I am suprised its free.

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Old 02-12-2011, 08:21 AM   #12
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Natural gas line sizing question.


That is some good stuff, thank you.

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