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Old 06-13-2013, 03:50 PM   #16
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Reasonable price to run a gas line inside


Hammerlane, hot water heater is not going to be a continious semand, neither will the furnace. As for the double oven, at most only one would be on for four hours maybe.

Today's appliances are a lot more efficient for using gas and electric, you would be surprised, that the 3/4" supply can keep up with that demand.

Now if it was only 1/2" all the way, I would be worried. Personally, I think they will be fime with what they have, and would have no problem adding that new line.

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Old 06-13-2013, 03:57 PM   #17
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Reasonable price to run a gas line inside


This thinking that a pipe will handle the demand- without consulting a sizing chart is part of the reason homeowners shouldn't run gas......what are you going say when the AHJ asks for the loads and sizing?
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Old 06-13-2013, 04:34 PM   #18
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Reasonable price to run a gas line inside


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Originally Posted by TheEplumber View Post
This thinking that a pipe will handle the demand- without consulting a sizing chart is part of the reason homeowners shouldn't run gas......what are you going say when the AHJ asks for the loads and sizing?
" Duh , I dont know " "Whats a load and the pipes are about this big " shows 2 fingers to estimate size.
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Old 06-13-2013, 04:40 PM   #19
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Reasonable price to run a gas line inside


You size pipe for the possibility of the full load being consumed at once, never for intermittent load. It may never happen that you run all the appliances at once, but if it does happen one appliance or all of them will suffer and it can get dangerous from there.

I won't get into the timeless debate about DIYers doing their own gas piping.
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Old 06-13-2013, 06:26 PM   #20
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Reasonable price to run a gas line inside


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Originally Posted by rosem637 View Post
Wow thats alot of information to consider just for adding a cooktop. I wonder if the OP considered all that when switching from electric to gas cooking.
A funny but true story.

My brother once asked what size gas to feed his outdoor pool heater.
I told him to run 1 inch from the meter itself underground..

His handyman ran 1/2 inch

Later that fall I get a phone call from my brother. His pool heater keeps going out....

He ended up running the 1 inch....
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Old 06-13-2013, 06:27 PM   #21
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Reasonable price to run a gas line inside


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****Don't look at it as you pay him $100 for 1 hour of work, look at it as he saved you 10 hours of work****
Quoting this for posterity.

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Old 06-13-2013, 07:10 PM   #22
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Reasonable price to run a gas line inside


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Originally Posted by TheEplumber View Post
This thinking that a pipe will handle the demand- without consulting a sizing chart is part of the reason homeowners shouldn't run gas......what are you going say when the AHJ asks for the loads and sizing?
Here is part of the 2012 NFGC sizing charts.
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Reasonable price to run a gas line inside-close-up-cap-cubic-feet-gas-per-hour.jpg  
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Old 06-13-2013, 08:59 PM   #23
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Reasonable price to run a gas line inside


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Originally Posted by gregzoll View Post
Hammerlane, hot water heater is not going to be a continious semand, neither will the furnace. As for the double oven, at most only one would be on for four hours maybe.
I agree that furnace and hot water are not continuous demand.

Do you have a reason why the Natl Fuel & Gas Code says "The total connected hourly load shall be used as the basis for piping sizing assuming all appliances are operating at full capacity simultaneously."

I personally am not going to lose any sleep over whether the poster keeps 3/4" or not. Seems his home was built with electric for cooking so thats why the 3/4" was used. When he gets a pipefitter in to do the work they may refuse to run 3/4" for him for the cooking appliances.
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Old 06-13-2013, 09:23 PM   #24
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Reasonable price to run a gas line inside


Only line in my house that is 1/2", is the one that goes to the Water heater. I have about 2 feet 10" of 1" that comes in mine, then a T for a 3/4 line that goes about 20 feet to the stove. From the T for the 1" & 3/4", it goes about 12 feet to the furnace, with a T that reduces to 3/4" to the Water heater, then reduces to 1/2" to feed the Water heater. At the T for the Water heater, it mine goes down about 2 feet to a 3/4" feed to the furnace.

I personally do not like the two runs of gas line, but if they ran them that way for a reason, I am leaving it until like I stated before, to go all 1" to where the Furnace is, then put in a manifold for 3/4" for the water heater & stove, so I do not have 20 feet of 3/4" along side the 12 feet of 1".
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Old 06-14-2013, 05:17 AM   #25
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Reasonable price to run a gas line inside


The OP has not responded since the 3rd post. Something may have scared him away?
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Old 06-14-2013, 08:44 AM   #26
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Originally Posted by rosem637 View Post
The OP has not responded since the 3rd post. Something may have scared him away?
They were on here this morning around 4:20 am., and replied to another topic. Most likely a lot to take in on this topic for the discussion.

Even if it was about plumbing potable water lines, same thing goes with running water lines, in how to size them for the demand, not the fixture.
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Old 06-14-2013, 09:15 AM   #27
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Originally Posted by rosem637 View Post
The OP has not responded since the 3rd post. Something may have scared him away?

Been busy with DIY projects ..... I got my answer ... No need to drag out this thread .....

Thanks for chiming in though
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Old 06-14-2013, 09:29 AM   #28
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Reasonable price to run a gas line inside


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Originally Posted by hammerlane View Post
Reason I asked all above questions is say the point in your photos is 30 feet of developed pipe length from the meter and is all 3/4".

By developed pipe length I mean the actual length may only be 22 feet but you have to add in any 90's or Tee's as its equivalent length of pipe.
A 3/4" 90 is equal to 2.06 feet and a 3/4" Tee is equal to 4.12 feet


So that point in the photo is 30 feet from the meter. 30 feet of 3/4" can deliver 151 cubic feet per hour. This is about 153,000 BTU per hour.

If your furnace is 100,000 BTU.
If your hot water tank is 45,000 BTU
If your cooktop is 36,000 BTU

This all adds up to 181,000 BTU per hour needed at the point in your photo.

Now you need to add in the developed length of pipe from the point in your photo to the cooktop which you say is 35 feet which is propably more like 43 feet when you factor in equivalent lenths.

An upsize to 1" from your meter may be needed to the point in your photos. Then possibly 1/2" or 3/4" can be run to furnace, hot water and cooktop.

Thirty(30) feet of 1" pipe can deliver 284 cubic feet per hour. This is about 288,000 BTU per hour.


BUT>>>>>>>>>>>>>>>>>>>

I've got 1 inch pipe up to POINT B (per above that 288,00 BTU to point A then 3/4 inch pipe to furnace and hot water heater.

I can't determine the furnace BTU, but lets say 100,000 as you posted, 50,000 is on the tag on the hot water heater .... both of these units are 7 feet straight down from point A. My cook top is a total of 51,000 BTUs (the sum of all 6 burners) approximately 30 feet away. I was going to put a Tee at point C and run CSST to my cook top. SO I should be OK .....

Last edited by CitadelBlue; 06-14-2013 at 09:42 AM.
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Old 06-14-2013, 02:42 PM   #29
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Reasonable price to run a gas line inside


CSST has a different flow rate chart than Sched 40 "black pipe". It will be a little less.

I believe 40 ft of CSST delivers about 20-25% less gas per hour than does black pipe.

I can find sizing chart for CSST and post the specifics if wanted.

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