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Posted: 1/17/2006 11:34:14 AM EDT
[#1]
Eyeball it.
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Posted: 1/17/2006 11:36:04 AM EDT
[#2]
If I remeber correctly Gas Pipe is OD. It is usualy printed all over it. I don't know about the ID measurement of gas pipe. I know that the ID and OD of copper varies by and 1/8. If all else fails, get a fitting and put it on the end and you will know what you have.
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Posted: 1/17/2006 11:36:08 AM EDT
[#3]
+ JB weld |
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Posted: 1/17/2006 11:36:30 AM EDT
[#4]
I'm assuming that you are talking about schedule 40 pipe or "black pipe."
Inside diameter generally determines pipe size, while OD determines tubing size. 3/4" pipe should be about 3/4" ID. According to the book, it specs out at .824" ID and 1.050" OD. |
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Posted: 1/17/2006 11:37:36 AM EDT
[#5]
use one of them tape-like measuring devices that I'm sure your wife has to get the circumference, then google for the formula that changes circum to diameter. Atleast, that's what I had to do last time 
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Posted: 1/17/2006 11:37:46 AM EDT
[#6]
See I was wrong.
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Posted: 1/17/2006 11:45:17 AM EDT
[#7]
You're probably thinking of refrigeration line. Although the specs are the same, the terminology is different. 3/4" copper pipe is, indeed, 1/8" larger OD, measuring 7/8". 7/8" refrigeration tubing would technically be the same thing, except it comes plugged and purged with nitrogen. They are both the same size (we're talking copper here), although one is considered pipe while the other is considered tubing. |
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Posted: 1/17/2006 11:45:27 AM EDT
[#8]
You can't eyeball it without looking past the Sphincter.
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Posted: 1/17/2006 11:51:08 AM EDT
[#9]
Beat me to it.
My gas pipe is OEM diameter thank God. ;) |
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Posted: 1/17/2006 11:51:30 AM EDT
[#10]
+ an O ring for the extractor! |
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Posted: 1/17/2006 11:52:43 AM EDT
[#11]
Saw it in half and take it to the hardware store...
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Posted: 1/17/2006 12:39:36 PM EDT
[#12]
Let me try again, but I think I got the answer.
I am still looking at hot water heaters, and one company said I could not go tankless without a gas pipe change. Another I went through to get a standard tank one started pushing the tankless one again. Since I never had the first company come out,(they wanted 40 bucks to look around,) I wanted to make sure the second one doesn't try to sell me something that won't work. Both agreed that a 3/4 gas line would be necessary. I have a set of dial calipers so I can check the OD, but didn't know what I was checking for. It is the standard black steel pipe coming out of the wall to the hot water heater. So if it is 3/4 pipe, I should see a little over an inch, if it is less than that, it is 1/2 pipe? |
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Posted: 1/17/2006 12:52:17 PM EDT
[#13]
Yes...... 3/4" pipe will be approximately 1" external diameter, probably a little bit over. 1/2" pipe will be approximately 3/4" external diameter, again, prob. a little bit over. This is for black iron pipe only, but you wont SEE copper gas line often, unless you're in the building trades. It's actually used for underground utility co. feeders to your house, and some 'flexible' connector pipe is made out of copper. (looks like bendy straws) I'm no plumber, (just a dumb wire puller)  but we had an on-demand gas water heater in our house when I was younger. I'm pretty sure we had 3/4" black iron. They DO work nicely tho, that much I CAN say for sure 
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Posted: 1/17/2006 12:58:33 PM EDT
[#14]
Thanks.
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Posted: 1/17/2006 1:04:48 PM EDT
[#15]
Pre-Brokeback Mountain gas pipe, or Post-Brokeback Mountain?
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Posted: 1/17/2006 7:07:52 PM EDT
[#16]
Most of the gas lines I run into are 3/8 or 1/2 inch!!! Some may be 3/4 or one inch! They will be black pipe!
You can couple up or down with a bushing!! Bob 
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Posted: 1/17/2006 7:21:15 PM EDT
[#17]
It's easier if you use a cutting torch. 
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Posted: 1/18/2006 5:52:20 AM EDT
[#18]
I know you can up size and down size, but I understood it was a supply issue. It doesn't increase supply by installing a coupling to move it up from 1/2 inch to 3/4.
It has to go from supplying around 40k btu to as much as 190k btu. I think 1/2 inch (which I am pretty sure I have now, since it measured about .89 OD,) maxes out at like 170btu. Well, depending on how far it is tapped off from the one inch main. |
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