Posted: 2/20/2017 9:52:09 PM EDT
|
Do I need to upsize my gas line?
I added a 90k BTU furnace last year and now we're adding a 62k BTU gas range. I'm worried my 3/4" line is too small EDIT: The 2" is a typo. I meant 8" according to the contractor that moved our meter a couple weeks ago. 
UPDATE: So I downloaded Size-It software and this is what it came up with for a 1.5" WC Overall Pressure Drop. Looks like if I use 3/4" to my drop down the wall for my new range I'll be okay, right? 
|
|
I think you are okay. Most of your lines are larger, just that 10' of 3/4" supporting both appliances. But I don't know how much you can add to one gas line regardless of size before you run in capacity problems.
You probably need to talk to someone that can actually get you a 100% answer. |
|
No way gas meter is 2IWC, if regulated it's 7IWC or around 12IWC if non regulated standard pressure. Propane will be 10-11 IWC. With natural gas you need at least 5 IWC at the appliance which will then regulate it down to 3.5IWC at the appliance regulator or gas valve.
what is your total house load, I am guessing you have a standard 250 meter on the house and no elevated pressure. [due to a large generator or other high demand device] |
|
Quoted:
No way gas meter is 2IWC, if regulated it's 7IWC or around 12IWC if non regulated standard pressure. Propane will be 10-11 IWC. With natural gas you need at least 5 IWC at the appliance which will then regulate it down to 3.5IWC at the appliance regulator or gas valve. what is your total house load, I am guessing you have a standard 250 meter on the house and no elevated pressure. [due to a large generator or other high demand device] |
|
Your service pressure downstream of the regulator should be 12" w.c. for all residential application.
If sized exact per code, your 3/4" pipe is probably undersized. However, it is most unlikely you would have all appliances running @ max output simultaneously and remember the pressure drop shown in Table 402 is a total of 0.3" w.c. Your appliance needs 7" w.c. to operate. There is plenty of "spare". No need to worry. International Plumbing Code - Gas piping table |
| Why not have a manifold where the main line enters the house, and then run separate lines from there to each appliance, instead of having a branching arrangement? My house has black iron pipe from the meter through the wall into the basement, where the manifold is located. From there, separate copper lines run to the furnace, water heater, and stove. I believe the copper pipe is 1/2" or 3/4", depending on the appliance. (The furnace has the larger pipe size.) There are a couple of more unused connections still available at the manifold. |
|
Quoted:
Why not have a manifold where the main line enters the house, and then run separate lines from there to each appliance, instead of having a branching arrangement? My house has black iron pipe from the meter through the wall into the basement, where the manifold is located. From there, separate copper lines run to the furnace, water heater, and stove. I believe the copper pipe is 1/2" or 3/4", depending on the appliance. (The furnace has the larger pipe size.) There are a couple of more unused connections still available at the manifold. Because I'd rather not repipe everything if I don't need to..... |
