House natural gas pipe

[cda]

Anyone know how and can calculate the pipe size I need????



So I have another plumbing company coming out to give an estimate.

I want it done right. I have had prices from $100 to $3000.

I have existing natural gas already.

Appears 3/4 inch line running from the meter through most of the attic. One story.

Currently running:
HVAC 75,000 BTU
Water heater 40,000 BTU

I need to either run a separate line for the gas range, or if luck extend what I have.

I want to add a gas range, maybe around 60,000 BTU.

The range will be the last appliance, about 80 feet from the meter.

Trying to figure out cubic feet of gas per hour

Size of pipe needed to the gas range

Does it need a separate pipe run from the meter?

Thanks


I do not know how much pressure is coming into the house. Will try to call the gas company, and see if I can get an answer.

 

[north star]

* + * + *

So, at your existing gas meter you have steel piping entering
your house.....What size enters the house ?.........After the steel
piping enters the house, what size is it in the attic ?.......What
type is it in the attic [ i.e. - steel piping, corrugated stainless
steel tubing, copper lines, plastic, other ? ].

Recommend that you sketch out a gas supply line diagram of
all gas lines in your attic & their sizes........Also, apply their
lengths.........Next, have you gone online to look for Gas Piping
Calculators ?.........This will be much easier than looking through
the various Tables in the IRC or the IFGC........And "Yes, you
will need to know the pressure at your meter".

* + * + *

 

[ICE]

If the pipe is extended the minimum size at the start would be 1". If a new pipe is installed from the meter to a 60,000 BTU stove 80' away 1/2" would work. One more foot in length and it will not work. This is based on 1,100 BTU per cubic foot. Your location may have a different value.

 

[cda]

* + * + *

So, at your existing gas meter you have steel piping entering
your house.....What size enters the house ?.........After the steel
piping enters the house, what size is it in the attic ?.......What
type is it in the attic [ i.e. - steel piping, corrugated stainless
steel tubing, copper lines, plastic, other ? ].

Recommend that you sketch out a gas supply line diagram of
all gas lines in your attic & their sizes........Also, apply their
lengths.........Next, have you gone online to look for Gas Piping
Calculators ?.........This will be much easier than looking through
the various Tables in the IRC or the IFGC........And "Yes, you
will need to know the pressure at your meter".

* + * + *

Steel

I think it is 3/4 run all the way

With 1/2 inch drops tees to the hvac and water heater,

 

[cda]

If the pipe is extended the minimum size at the start would be 1". If a new pipe is installed from the meter to a 60,000 BTU stove 80' away 1/2" would work. One more foot in length and it will not work. This is based on 1,100 BTU per cubic foot. Your location may have a different value.

That is my other problem I cannot ever determine pipe size

It looks 3/4, I do know the drops are 1/2, because they are marked.

House built in the 70’s

Whatever is off the meter runs almost to with in 15- 20 feet of where the range would be.

I hope I can just extend and not have to do a separate run.

 

[cda]

Od

Not sure how it translates to ID

That is why I r a fire inspector

 

[cda]

Almost at the end of the run
1/2 tees to left for water heater

Tees right for old gas dryer valve not in use.



Right before the tee shown above :::

 

[HForester]

Those pipe sizes are 1" and 3/4", I do believe from my memory. Here's my check:

SCH 40 Bare & Black Standard Steel Pipe

Item Size Outside Diameter
SCH 40 Pipe-1/2 0.840 in
SCH 40 Pipe-3/4 1.050 in
SCH 40 Pipe-1 1.315 in

 

[mtlogcabin]

Tees right for old gas dryer valve not in use.

So what BTU was the old gas dryer no longer in use?
I will bet it was at least 1/2 the BTU in size to the stove you want to install.

 

[cda]

So what BTU was the old gas dryer no longer in use?
I will bet it was at least 1/2 the BTU in size to the stove you want to install.

Never had a gas dryer before. The pipe is there, just capped.

I looked at different stoves and they seem to average around 60000 btu
I get that from adding all the burners,,,, If that is the right way to do it ???

 

[cda]

Those pipe sizes are 1" and 3/4", I do believe from my memory. Here's my check:

SCH 40 Bare & Black Standard Steel Pipe

Item Size Outside Diameter
SCH 40 Pipe-1/2 0.840 in
SCH 40 Pipe-3/4 1.050 in
SCH 40 Pipe-1 1.315 in

Thanks

 

[SCBO1]

About the only place I see 1/2" gas piping used is on the dirt leg (sediment trap) or entering the furnace or appliance after being tee'd off of a larger branch line.

The IFGC has an appendix-A that might be of help but may also confuse us more.

 

[SCBO1]

Also see IFGC Chapter 4, section 402.

cda, thanks for the question, it's an area that I frankly don't venture into, calculating gas pipe size.

Wonder how many plumbers just do what they did on the last house and claim, "That's how we've always done it?"

 

[cda]

Also see IFGC Chapter 4, section 402.

cda, thanks for the question, it's an area that I frankly don't venture into, calculating gas pipe size.

Wonder how many plumbers just do what they did on the last house and claim, "That's how we've always done it?"

That is what I am afraid of.

I have not found a company to trust yet, except the $ 3000 one. And to maybe add just 20 ft of pipe, seems just a little high, but they did say they would calculate it.

 

[ADAguy]

Have you spoken with your local gas company?
Checked the label on the new stove to verify MFG's requirements?

 

[cda]

Have you spoken with your local gas company?
Checked the label on the new stove to verify MFG's requirements?

Going to call today

Most stove install instructions are vague

Some have none, some say give 1/2 or 3/4 pipe, You pick the size.

 

[mtlogcabin]

Your system should already be sized for the gas dryer @ 35,000 BTU per the IFGC. Your new stove/oven will be 65,000 BTU per the IFGC.
Post #7 picture I believe is a 3/4" line. If the tee is 3/4" x 3/4" x 3/4" and then reduced to the 1/2" line and cap You should be able to start at the 3/4" tee and run the line from there.
You need the following info from the gas company to properly size the line

Inlet Pressure

Pressure Drop

Specific Gravity

 

[cda]

Your system should already be sized for the gas dryer @ 35,000 BTU per the IFGC. Your new stove/oven will be 65,000 BTU per the IFGC.
Post #7 picture I believe is a 3/4" line. If the tee is 3/4" x 3/4" x 3/4" and then reduced to the 1/2" line and cap You should be able to start at the 3/4" tee and run the line from there.
You need the following info from the gas company to properly size the line

Inlet Pressure

Pressure Drop

Specific Gravity

Thanks,

Just got off the phone, they are supposed to have someone call me, and hopefully they have the answers to above.


Yes, my hope is add to the 3/4 and extend it.

They still want a lot of money for that. Will see what the next plumber quotes.

Have not had/ used an electric induction stove, but they do not look cool friendly.

 

[ADAguy]

What ever floats your boat? Gourmet cook? Most resterants only use gas.

 

[cda]

Neighbors meter, he has a pool, may have a heater ??






My meter::

Appears 175 cfh???

Maybe 5 psi??












Ok learning more than I want to know about natural gas piping

 

[ADAguy]

You asked (smiling) save a dime, spend a dollar.

 

[ICE]

For $3000 I’ll do it myself and calc twice.

 

[cda]

For $3000 I’ll do it myself and calc twice.

Where’s the forum discount???

 

[cda]

Well plumber came by

I do have one inch feed into attic

Somewhere, more than likely at the first tee/ hvac, it must reduce to 3/4.

Good news 3/4 runs to about 20 feet of where the stove will be.

No calculations done and he was not sure about the capacity of the existing meter,,,

But felt just add onto the 3/4 and run 3/4 to the stove, and all should be good.

I guess should not have hvac/ water heater and all burners running at the same time, anyway.


Going to go to the shop a figure the dollar damage and call me.