How much volume per linear ft. in 3/8" hose?

[Twodose]

Anyone know of a chart online that will tell you the volume of water per linear foot in a 3/8" pipe?

 

[Mr.Aap]

Easy to figure out on your own...Graduted cylinder and a foot of tubing....

 

[mac]

The volumn of water in a cylinder is computed by multiplying the area of the cross section of the cylinder by its length. Volumn= pi x r squared x length, or V= 3.14 x 3/16 squared x 12, which equals 1.3246848 cubic inches, or there abouts. That comes out to about 3/4 of an ounce. You want an interesting fact about volumns of liquids? Well, here it is anyway. If you took the entire gulf of Mexico and represented its volumn by the interior volumn of the new Cowboy's stadium, and the compared the volumn of oil spilled by the recent leak, the leak would come out to a 24 ounce can of beer. Go figure.

 

[Twodose]

Specifically, I am looking for the amount of liquid contained in a length of hose for each bay so when I purge it with an antifreeze solution that I won’t waste the liquid I am using for the purge.

Every bay varies in length for ex:

Bay # 1 - (Length of Run) - (57'-3")

Bay # 2 - (Length of Run) - (46'-1")

Bay # 3 - (Length of Run) - (28'-2")

Bay # 4 - (Length of Run) - (36'-11")

Bay # 5 - (Length of Run) - (51'-6")

Bay # 6 - (Length of Run) - (67'-1")

Bay # 7 - (Length of Run) - (85'-6")

I can find the formula all over the internet that should be used to calculate the volume of each run, but putting it to practical use is the problem.
Saying “Graduated cylinder and a foot of tubing” is very vague unless the formula can be used to calculate the volume of a length of tubing.

Ok, V=3.14 x 3/8 id tube squared x 12 is the volume in one foot of tubing, but put it to practical use and give me an example of how it is calculated.

3/8 id tube fraction has to be converted to a decimal figure so you can do it on a calculator, so that would be .375. so do you square .375 and then times that by 3.14 then times 12? That would give you a calculated volume per ft.

I am trying to figure out the volume for different length of runs for each bay, so would the given formula be V= 3.14 x .375² x 1026 for the length of run for bay # 7 of 85’-6”?

 

[MEP001]

I used this calculator set to inches, .375 x 12 to get 5.30357 cu.in. per foot, which equals 2.94 ounces per foot. All you need from there is to multiply 3 (rounded up) by feet in length.

 

[I.B. Washincars]

so would the given formula be V= 3.14 x .375² x 1026 for the length of run for bay # 7 of 85’-6”?

The formula is pi times the RADIUS squared, not the diameter, so it would be 3.14 X .1875 sq.

 

[mjwalsh]

Anyone know of a chart online that will tell you the volume of water per linear foot in a 3/8" pipe?

Twodose,

I came up with 1.324 cubic inches per foot with a CAD program. If you multiply that by the number feet you should be fairly accurate cubic inch wise. With that figure you can use any number of online conversions to get quarts, gallons or whatever.

I hope this helps. Let us know if it verifies out with other approaches.

MJ

 

[Twodose]

I did it like this:

.375 x .375 = .140625 x 3.14 = .441562 x 1026" (85'-6") = 453.042612 Cubic Inches ÷ 231 CI per gallon= 1.961223.
Or about 2 gal.

Would this be correct?

This sounds about right for a run of 3/8ths" x 85'-6" long.

 

[mjwalsh]

I did it like this:

.375 x .375 = .140625 x 3.14 = .441562 x 1026" (85'-6") = 453.042612 Cubic Inches ÷ 231 CI per gallon= 1.961223.
Or about 2 gal.

Would this be correct?

This sounds about right for a run of 3/8ths" x 85'-6" long.

Twodose,

I came up with .49004 gallons. I will be very surprised if this figure is off based on past experience.

One way of verifying is using (12" x .375" x .375") x 85.5 = 144.28 cubic inches which converts to volume of .62459 with an online conversion. This is more volume but it seems to be somewhat of a verification visualizing the extra proportionally.

MJ

 

[MEP001]

With my formula I get 1.96 gallons as well.

 

[MEP001]

I just realized that the calculator to which I linked also asked for the radius of the tube. So 1 foot of 3/8" ID hose should contain 1.3259 cu. in. of fluid or .73 fl. oz.

FWIW, I filled a 12' bay hose with water and drained it into a measuring cup. It was about 11 1/4 ounces.

 

[Twodose]

MEP, I don’t know who you are, what you are or where you are, but I would like to let you know that since I have been in this business 1984, I have come to respect your word on whatever subject we are talking about.

What I would like to know is what is your backround, and do you live and sleep the Carwash business? You seem to know a hell of allot about allot of things pertaining to this business and to know that I respect you.

I also respect the wisdom and collective knowledge of all who post on this forum, including Bill P, who I have spoken to personally and have the utmost respect for, and all of you.

Thank you all for the intellectual input you have had on any subject I proposed to query on this forum, it is a benefit to us all.

Thank You. Thank You.

http://www.youtube.com/watch?v=l3haNcfHvhQ

Crank it all the way to the right.

 

[I.B. Washincars]

I just realized that the calculator to which I linked also asked for the radius of the tube. So 1 foot of 3/8" ID hose should contain 1.3259 cu. in. of fluid or .73 fl. oz.

FWIW, I filled a 12' bay hose with water and drained it into a measuring cup. It was about 11 1/4 ounces.

MEP, I was worried about you there for a while. I had noticed that you used the diameter to figure this out and said to myself "My god, he is losing it. We are all screwed!" I then got to pecking on my calculator to figure out the volume of this hose so I could post and verify that about 1/2 gallon was correct. Had I noticed that there was another page of posts I would have saved a little time and noticed that you had caught your mistake. Hmmm, unbelieveable, I made a mistake too.

I'll have to agree with Twodose. I wish I could soak up a lot of the stuff you have running around in that brain of yours. Do you ever get to any of the conventions? I'm sure a lot of the forum members would like to meet you.

 

[mjc3333]

Just one final thought...

If you use MEP's figure which was as close to "real" world as possible, I get 0.6226 gallons of fluid in an 85 foot 3/8 inch hose.

12 foot section of hose holds 11.25 ounces of fluid.

You have 128 ounces in 1 gallon. (11.25 ounces / 128 ounces)

That would give you 0.0879 gallons of fluid in 12 feet of 3/8 inch hose.

Then take 85 feet and divide it by the 12 feet to equal 7.0833

7.0833 times 0.0879 would yield 0.6226 gallons of fluid in 85 feet 3/8 inch hose.


Also if you go back to the very beginning, MEP's figures would yield 0.9375 ounces per linear foot of 3/8 inch hose, or 0.0073 gallons per foot.

(12 feet / 11.25 ounces) = (1 foot / x ounces) simple algebra would give you 12 X=11.25 with x equal to 0.9375 ounces.

then convert the ounces to gallons 0.9375 ounces / 128 ounces = 0.0073 gallons in 1 foot of hose.

Hope this helps......

MJC

 

[dreese]

Google "ProKon converter program". It will lead you to a shareware program ($20 if purchased if memory serves) that will not only do any conversion (feet to meters, C temps to F temps, etc) it also has a "tank volume" calculator under the misc category. Enter the diameter of your "tank" (the tubing) with the height (your run) and it will automatically give you the volume contained in that run - no need to do all the math. I use it all the time - pretty cool program.

 

[mjwalsh]

Erosion or manufacturing tolerance factor! Sleuthing along

I just realized that the calculator to which I linked also asked for the radius of the tube. So 1 foot of 3/8" ID hose should contain 1.3259 cu. in. of fluid or .73 fl. oz.

FWIW, I filled a 12' bay hose with water and drained it into a measuring cup. It was about 11 1/4 ounces.

Twodose, Mac, Mep007, Pat, & others,

Several of us came up with close to my 1.3254 per foot post. Mac came up with that figure first --- so he deserves the prize for that.

Mep007 deserves the prize for verifying it the most thoroughly at this point. Based on .73442 ounces * the 12 feet of actual real world hose that Mep tested should have been 8.81304 fluid ounces. You do know what this means ---- there are tolerances with the manufacturing process that we have to be on the alert for --- if it could potentially affect our needed analysis or decision. Wow ---- 11.25 vs 8.8 seems pretty significant. That manufacturer might want to review their specifications. 2nd thought --- I remember replacing a 3/8" supply hose to my farthest bay that lasted for 20 years & there definitely was natural erosion that made the inside diameter significantly larger! A caliper could potentially help there.

I was starting to fall asleep in the middle of the day today --- thanks for rattling my cage & waking me up you guys!

Mep007, was that a brand new hose? That fact would have a bearing on our detective work!

MJ

 

[pitzerwm]

Two dose, thanks for the kind words, but all I do is to keep the cats going the same direction on the freeway.

 

[I.B. Washincars]

I was actually going for the prize for getting those guys away from multiplying the diameter instead of the radius.

I wonder if a HP hose grows a little after it's been under pressure?

 

[MEP001]

there are tolerances with the manufacturing process that we have to be on the alert for

That's certainly true with GoodYear hose. I make my own fragrance and shampoo hoses out of blue Neptune (Looks better and it doesn't leave black marks on the door sills) and I can feel variances in the inside diameter when I'm pulling the hose over the tubing.

I remember replacing a 3/8" supply hose to my farthest bay that lasted for 20 years & there definitely was natural erosion that made the inside diameter significantly larger! A caliper could potentially help there.

I hadn't thought of that - the hose I used had been on for at least a year, maybe two. I'll take a new piece and run the test again.

 

[Twodose]

The formula is pi times the RADIUS squared, not the diameter, so it would be 3.14 X .1875 sq.

How do you figure the radius is 3/16 on a 3/8 id pipe? Is it half the diameter?