Bob, Check your references. You have it backwards. Refrigeration tubing (ACR) is sized by the actual OD. Plumbing & heating tubing is sized by the nominal I.D. Therefore 1/2" plumbing tubing has an actual OD of 5/8". I just checked my textbooks to verify this so as not to give dis-information.
Source: Refrigeration & Air Conditioning Technology, 3rd Edition, 1995, page 99.
I agree with Doug: i.e. pi times, the radius raised to the power 2 (squared) So; Inside diameter divided by two = Radius of X.Section. In this case one half divided by 2 = one quarter. Area of X.Section = Radius squared, multiplied by pi. This is one quarter times one quarter times pi = 1/16 x 3.142 = 0.196 Length of 100 feet = 100 x 12 inches. Thus (1/4 x 1/4 x 3.142 x 1200) = 236 cubic inches. Multiply that 236 by 0.004 to get gallons = 0.9 gallons approx. (Not sure if that's US or Imperial gallons but "A bit less than a gallon" is close enough). Anybody else agree? BTW those 236 cubic inches will weigh approx 8.5 pounds. Those 8.5 pounds will require 8.5 BTUs for every degree Fahrenheit change of temperature. So if that 8.5 lbs comes out of the tank at temperature of, say, 160 degrees, sits in the pipe and cools down, to say 60 degrees it will lose 100 x 8.5 = 850 BTUs of heat. If electrically heated that's equivalent to about one quarter of a kilowatt hour (unit) of electricity. If your electricity costs 10 cents per kilowatt hour that's a waste (sort of) of 2 to 3 cents. Of course that heat, slight though it is, could end up helping to heat the house! BTW There is a very good site at <
but not the same regardless of material. E.g. nominal 3/4" steel, copper, PVC, and CPVC pipe are different sizes.
-- Regards, Doug Miller (alphageek at milmac dot com)
Nobody ever left footprints in the sands of time by sitting on his butt. And who wants to leave buttprints in the sands of time?
Hi - No need to argue. I just wanted to find out how much water was in a 1/2 inch by 100 foot copper tubing. Just a ball park amount. I was surprised at just how little an amount of water it is. I am not worrying about wasting water - I am trying to cut down the time it takes for hot water to get to my showers. I am surprised it hold less than a gallon of water. If I insulated that 100 feet of copper tubing - the water in it will not cool off so quickly. Presently it is running through a 3/4 copper tube that is buried in the concrete slab. It is a double whammy - since it is in concrete and not insulated - you lose heat thru the heat sink - and since it is 3/4 copper the tube holds much more water. Harry
Not to nitpick, but the OP had suggested pi*radius (i.e., ID/2), not pi*radius/2.
So in terms of ID, the formula is: pi*(ID/2)*(ID/2) where pi=3.14159....
Let me write this down first you are probably right and I worked a hard day today.
7/8 Refrigeration equals.........3/4 PlumbingI just bought a few hundred refrigeration fittings today too!
My bad, thanks for the correction. My brain is right my hands are stupid today
3/4" schedule 40 steel pipe has an OD Of 1.050" and a wall thickness of 0.113" for an ID of 0.774".
See:
I didn't check on other materials but it appears that ASTM D-1785 codifies the dimensions. That'd be the place to see if the standards vary by material.
[snip]
Quick measurements of actual pipes in my basement shows the following ODs for nominal 3/4 pipe: galvanized steel 1.060 sch 40 PVC 1.055 black steel 1.030 sch 40 CPVC 0.885 copper 0.875
-- Regards, Doug Miller (alphageek at milmac dot com)
Nobody ever left footprints in the sands of time by sitting on his butt. And who wants to leave buttprints in the sands of time?
The table I published above used the formula =PI()*(B2/2)^2 in the Excel spreadsheet. The B column holds the Inside Diameter. Excel supplies the right value for pi.
So what's your point? 1/2" sched 40 is .680" OD. I think you are confusing mechanical tubing with sched 40 pipe.
My point is stated in the article. I'll repeat it now. Pipe is not measured by ID. It is measured by OD and wall thickness.
No, I am not.
,
schedule,
I'll bet the copper 'pipe' is actually 7/8" rigid copper tubing. Perhaps the same is true for the CPVC. Are they labeled ASTM D-1785
3/4" schedule 40?laziness?
it looks more about wrongness, cant solve it without excellness, argue over
1/1000 of an inch of pipe inner diameter and avoid the question entirelyness, and just plain silliness.personally, if i didnt want to do the SIMPLE math, i would have filled 6" of pipe with water, stuck my finger over one end, and drained it into a measuring cup. as for what to do once you have this measurement, ill leave as a question for all to ponder....
randy
Caught it after I posted it, that's why I reposted it.
Thought the second post would 'over-write' the first. Hmmmmmm......
later,
tom
you are dead wrong, dude.
Hi Tom - If you believe that education creates better people - and you believe that America is the best country in the world to live in - then you must therefore believe that our education system made our country better. My view point - I was a public school teacher for 33 years in the backwoods of PA. I have seen many great teachers there come and go. I feel our students do very well for themselves. Our system is not perfect and we are constantly trying to improve it. If you would spend a few years in our system - you would come out with nothing but admiration. Lots of people try to be teachers - and leave after a couple years burned out. I am no idea what you do for a living - but I am sure it is not as easy a target as public schools - everyone that goes through a school as a student thinks they are an expert on education. :-) Harry
Dear Mr Troll:
The OD for 3/4" schedule 10 pipe is 1.050". The OD for 3/4" schedule 40 pipe is 1.050". The OD for 3/4" schedule 80 pipe is 1.050".
The ID's are different for each.
I love our public school system!
Because it teaches children that school is a 100% education, I only have to compete with foreigners for my computer consulting positions. Only they are willing to self-learn nonschool taught programming languages, and since I can speak/read/write english(bad at times) and they don't, I get to name my own price.
Go America!
tom
Why did you not say that the OD for *1.050* schedule 10 (or 40 or 80) pipe is 1.050" ? Because to most of the plumbing world (and yourself), it's known as 3/4" nominal ID pipe, not 1.050 OD. Are we arguing over how a pipe is "measured" or "sized" vs. how it is "named" or "called"? How are we to reconcile that 3/4" pipe is named for its nominal ID, yet it is hardly ever called 1.050" pipe, unless it is called by something for which it is "measured"?
Because the ID was the most important characteristic in terms of determining the pipe's resistance to flow, water pipe was named for its ID. The 3/4" pipe size was thus established by some 'primordial 3/4" ID pipe' whose OD turned out to be 1.050". When they made pipe with other wall thickneses, for the sake of compatibility with existing fittings (and dies) which thread onto the OD, they varied the ID slightly to be able to keep the OD constant. Nevertheless, they persisted in calling it by its nominal ID.
However, some types of tubing were always named for their OD, thereby avoiding this whole mess.
%mod%
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