Gas meter connection and sizing

Hi.
I want to add a gas range to my system. I currently have 265 KBTU total. My longest run (the 160k furnace) is 30 feet with 6 elbows and 2 tee fittings between it and the meter. Everything is 3/4" pipe. I want to add a 60 KBTU gas range, bringing my total up to 325 KBTU.

So, I think I need 1-1/4" coming into the house from the meter. My plan was to come in at 1-1/4, then branch out - connecting to the existing 3/4" pipe for the current loads, and running a separate 3/4" pipe to the range.

My current meter is a Rockwell R-275. Which I think is undersized for my plan. But I contacted the gas company and they got back to me stating "...the R-275 meter will accurately pass up to 410 KBTU at its current configuration." And so, they said, I don't need an upgrade.

My questions are:
1) does what the gas company told me make sense?
2) The meter outlet has a 3/4" union connection. Should I:
a. Expand to 1-1/4" as close as practical to the meter, or
b. Expand to 1-1/4" inside the crawl space (about 2 feet and three elbows from the meter), or
c. Replace the union with a 1-1/4" union (and where can I find one of these)?

Thanks.

 

You don't mention how far away the stove will be, but assuming it's not too far away, say less than 40' you might get by with 1" pipe. You need to know how many BTUs/ cu. ft. your local supplier is supplying (probably around 1050) then use one of the gas-sizing videos on youtube to help you make the determination. You could run that 325K load on 1¼" to 125'. The gas co is most likely accurate with their meter specs. Start your run at the meter.

 

Thanks.
The run to the range will be about 25 ft.
Any idea where I can get a 1-1/4" fitting to connect to the meter Like the existing 3/4" shown here in the photo? Or should I just replace that elbow with a 3/4 x 1-1/4 elbow?

 

That would be fine.

My setup goes 3/4" from the meter up to the bottom of the floor joists where it's converted to 1".