Help sizing gas line - with diagram

[Andy_GTS]

Hello,

I have a newly built garage and I'm looking to install a 75k BTU heater in the garage. In the diagram attached I have shown my home layout and gas requirements. I need help determining if I will need to upgrade the existing 3/4 inch home piping to 1in. I also am looking for advice on the TBD piping (purple). I have a partially finished basement and all gas pipe connections are accessible. I currently do not have a gas range but I would like the ability to install one in the future.

Any advice on my gas piping? Thanks.

 

[R.Anderson]

Hello,

I have a newly built garage and I'm looking to install a 75k BTU heater in the garage. In the diagram attached I have shown my home layout and gas requirements. I need help determining if I will need to upgrade the existing 3/4 inch home piping to 1in. I also am looking for advice on the TBD piping (purple). I have a partially finished basement and all gas pipe connections are accessible. I currently do not have a gas range but I would like the ability to install one in the future.

Any advice on my gas piping? Thanks.

Picture is too small. What pressure is in the line already?
BTUs for the other units will be needed to for this to be figured out.

 

[Andy_GTS]

Picture is too small. What pressure is in the line already?
BTUs for the other units will be needed to for this to be figured out.

I loaded the picture again. Not sure why it was so tiny.

 

[UpstateNY]

I have the same config, same pipe size, same lengths, but I have even a greater BTU load than you do. You do not need to upgrade any pipe, install it as you show in the diagram. 3/4" for TBD pipe will be fine and you give you room for a larger heater if desired. For the future range you may need to have the meter upgraded to a larger size. Utility will do that for free. You're all set for now. Git 'er done.

 

[Andy_GTS]

Update:

All the lines in red I have upsized to 1 inch. I did this because I have the finished basement ceiling removed for other projects and I may want a gas range and dryer in the future.

My next question is what line should I run in the garage? Its will be 1 inch from the meter to the garage exterior. Is 3/4 enough or should I keep going with the 1 inch. The "longest run method" would have me continuing with 1 inch, but I'm wondering if its REALLY necessary?

Thanks

 

[Yamaguy]

If your furnace is truly 40k btu's you will be okay. I would run 1" poly out to the building for a bit of extra capacity in case needed in the future.

 

[Andy_GTS]

If your furnace is truly 40k btu's you will be okay. I would run 1" poly out to the building for a bit of extra capacity in case needed in the future.

Yes, my furnace is a 40K input 90% furnace. I have a 998 sqft house and its pretty well insulated. The buried line is already in and is 1 inch poly courtesy of the local utility company. They fused it and sold it to me.

 

[Jackfre]

I'd carry 1" to the edge of the house, 1" poly to the shop and I'd stub up with 1" before reducing to 3/4 for the heater. That will give you a bit of oversizing, but you want that. Build in a bit of extra capacity. You just don't know what you are going to want in the future. The real test is when you get it all in. Fire up all the appliances and see if you are holding pressure with your manometer.