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Posted on Jan 02, 2017

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You can convert pipe size to gallons per minute of flow by calculating the cross-sectional area of the pipe and making some reasonable assumptions about pipe volume and the rate of flow. Pipe sizing is measured by the internal diameter of the pipe, not the overall outside diameter. Once determined, the overall volume can be calculated. Pipe flow is described in gallons per minute. Shorter lengths of pipe will have a greater flow than a longer length of the same diameter. This is caused by internal resistance of the pipe itself. By the same reasoning a larger diameter pipe will have a greater flow or GPM than a smaller pipe at the same pressure or flow rate. Pressure is described as pounds per square inch. The square-inch measurement is determined by the area of the pipe. The pounds are the amount of force that is placed on the liquid to push it through the enclosed space.With that background, you can estimate the flow based on the pipe size.

Find the cross-section area of the pipe. Area is equal to pi times the radius squared or a = 3.14 x r2. A two-inch diameter pipe would have a cross-section area of 3.14 x 12 or 3.14 square inches.

Understand that water has a certain pressure associated with the height of that water. One pound of water pressure, or 1 PSI, is equal to 2.31 feet of elevation in height. In other words, a 1-inch column or pipe of water that is 2.31 feet high will have a pressure of 1 PSI. The overall height -- not volume -- of the pipe corresponds to the pressure. A 6-inch diameter pipe that is 2.31 feet high will only have 1 PSI.

Find the volume of the 2-inch diameter pipe in Step 1 that has a length of 10 feet. Ten feet is equal to 120 inches. Multiply 3.14 square inches, the cross sectional area, times the length. The volume of the pipe is equal to 376.8 cubic inches of volume.

Convert cubic inches into cubic feet. One cubic foot equals 1,728 cubic inches. Divide 376.8 cubic inches by 1,728 cubic inches per cubic foot and the answer is .218 cubic feet. This means that the 2-inch diameter pipe that is 10 feet long has an internal volume of .218 cubic feet.

Calculate the amount of water that can be contained in the section of pipe at any given time. One cubic foot of water is equal to 7.48 gallons. Multiply 7.48 gallons by .218 cubic feet and the amount of water in the pipe is equal to 1.63 gallons.

Find the GPM if the flow of water is one foot per second. Multiply the one-foot per second flow by 60 seconds per minute and the flow is now 60 feet per minute. In other words the water will flow through the 10-foot pipe six full volumes for every minute. Since the piping contains 1.63 gallons per 10 feet of pipe, multiply 1.63 by six and the final GPM is equal to 9.78 GPM of water flow from the 2-inch diameter pipe.

Find the cross-section area of the pipe. Area is equal to pi times the radius squared or a = 3.14 x r2. A two-inch diameter pipe would have a cross-section area of 3.14 x 12 or 3.14 square inches.

Understand that water has a certain pressure associated with the height of that water. One pound of water pressure, or 1 PSI, is equal to 2.31 feet of elevation in height. In other words, a 1-inch column or pipe of water that is 2.31 feet high will have a pressure of 1 PSI. The overall height -- not volume -- of the pipe corresponds to the pressure. A 6-inch diameter pipe that is 2.31 feet high will only have 1 PSI.

Find the volume of the 2-inch diameter pipe in Step 1 that has a length of 10 feet. Ten feet is equal to 120 inches. Multiply 3.14 square inches, the cross sectional area, times the length. The volume of the pipe is equal to 376.8 cubic inches of volume.

Convert cubic inches into cubic feet. One cubic foot equals 1,728 cubic inches. Divide 376.8 cubic inches by 1,728 cubic inches per cubic foot and the answer is .218 cubic feet. This means that the 2-inch diameter pipe that is 10 feet long has an internal volume of .218 cubic feet.

Calculate the amount of water that can be contained in the section of pipe at any given time. One cubic foot of water is equal to 7.48 gallons. Multiply 7.48 gallons by .218 cubic feet and the amount of water in the pipe is equal to 1.63 gallons.

Find the GPM if the flow of water is one foot per second. Multiply the one-foot per second flow by 60 seconds per minute and the flow is now 60 feet per minute. In other words the water will flow through the 10-foot pipe six full volumes for every minute. Since the piping contains 1.63 gallons per 10 feet of pipe, multiply 1.63 by six and the final GPM is equal to 9.78 GPM of water flow from the 2-inch diameter pipe.

Jan 19, 2018 | Plumbing

0.23 gallons. Figured out by assuming the pipe is .75 inches inside diameter. To get the volume, calculate the area of the cross-section with the formula Pi times the radius squared. Which is 0.375 squared times Pi = 0.441786. Multiply that times 12 inches per foot times 10 feet = 53 cubic inches. One gallon = 231 cubic inches.

Jun 03, 2015 | Cars & Trucks

Surely it depends on the material used in the manufacture of the pipe? This would include but is not restricted to the thickness of the pipe wall and the type of joints used between lengths.

A half inch ABS pipe will respond differently to a half inch copper pipe or a half inch PVC pipe. Joints may be push-fit, soldered or welded (plastic weld)

A half inch ABS pipe will respond differently to a half inch copper pipe or a half inch PVC pipe. Joints may be push-fit, soldered or welded (plastic weld)

Jan 06, 2015 | Garden

look up inside diameter of your 2' pipe

area inside a circle = 3.1415 (pi) x radius squared

for example if inside diameter of pipe is 1.75", then radius is half or .875

radius squared is .7656 x 3.1415 = 2.4 square inches

160 feet pipe = 1920 inches

2.4 square inches x 1920 = 4618 cubic inches

Then convert cubic inches into gallons:

http://www.metric-conversions.org/volume/cubic-inches-to-gallons.htm

If water is hot, then that can affect final calculation

Gene

area inside a circle = 3.1415 (pi) x radius squared

for example if inside diameter of pipe is 1.75", then radius is half or .875

radius squared is .7656 x 3.1415 = 2.4 square inches

160 feet pipe = 1920 inches

2.4 square inches x 1920 = 4618 cubic inches

Then convert cubic inches into gallons:

http://www.metric-conversions.org/volume/cubic-inches-to-gallons.htm

If water is hot, then that can affect final calculation

Gene

Aug 26, 2014 | Water Heaters

18,600 gallons (length x width x depthx 7.51 =gallons)

Aug 23, 2014 | Pool & Spa

9.31 US Gallons

May 12, 2014 | Office Equipment & Supplies

I don't have the number for you, but I can offer a method for measuring it. First, the next time you do laundry, set the water level switch to where you will use it for the dyeing task. With the lid open, but with no clothes inside, turn on the washing machine. Observe and note the level of the water when the machine stops filling. Measure the depth of the water. Add clothes and detergent and wash in the usual manner - you don't need to waste that water.

Next, pour four gallon jugs of water into a clean five-gallon pail, and mark the level in the pail (four gallons in the pail is much easier to handle than a brim-full five gallons). Pour that into the machine, and measure the depth. Put in another four gallons of water, and measure the depth again. If the bottom part of the agitator is covered by the first four gallons, you can can calculate from the increase in depth made by the second four gallons how many more gallons you need to get to the fill depth. (The bottom of the agitator takes up more volume per inch of depth than the center and top,) If the bottom of the agitator is not covered by the first four gallons, but is covered by the second four, then add a third four-gallon pour and measure the depth once more.

Here is an example measurement: water depth on chosen load size setting: 16 inches.

Depth on first four gallons: 2 1/2 inches (some of the water is under the bottom of the inner tub). The agitator bottom taper is almost covered, but not quite.

Depth on second four gallons: 7 inches. The water level is above the bottom section of the agitator, so from this point the water depth will increase by the same amount per gallon added.

Depth on the third four gallons: 11 inches. We can now see that from this point, adding four gallons makes the water level go up four inches, so to reach the 16 inch mark,we need five more gallons. The total will be 4+4+4+5 = 17 gallons.

For what it's worth, there's about 7.48 gallons per cubic foot. If your machine's outer tub holds an additional cubic foot of water, my example numbers may be roughly what you will get.

Next, pour four gallon jugs of water into a clean five-gallon pail, and mark the level in the pail (four gallons in the pail is much easier to handle than a brim-full five gallons). Pour that into the machine, and measure the depth. Put in another four gallons of water, and measure the depth again. If the bottom part of the agitator is covered by the first four gallons, you can can calculate from the increase in depth made by the second four gallons how many more gallons you need to get to the fill depth. (The bottom of the agitator takes up more volume per inch of depth than the center and top,) If the bottom of the agitator is not covered by the first four gallons, but is covered by the second four, then add a third four-gallon pour and measure the depth once more.

Here is an example measurement: water depth on chosen load size setting: 16 inches.

Depth on first four gallons: 2 1/2 inches (some of the water is under the bottom of the inner tub). The agitator bottom taper is almost covered, but not quite.

Depth on second four gallons: 7 inches. The water level is above the bottom section of the agitator, so from this point the water depth will increase by the same amount per gallon added.

Depth on the third four gallons: 11 inches. We can now see that from this point, adding four gallons makes the water level go up four inches, so to reach the 16 inch mark,we need five more gallons. The total will be 4+4+4+5 = 17 gallons.

For what it's worth, there's about 7.48 gallons per cubic foot. If your machine's outer tub holds an additional cubic foot of water, my example numbers may be roughly what you will get.

Apr 24, 2014 | KitchenAid KAWS850L Top Load Washer

(1.5ft)^2 * Pi * 30 ft * 62.4 lbs/cu-ft = 13232.4 pounds plus the weight of the pipe which will vary depending on the material of the pipe.

You can find the weight of the pipe if you know the brand and material as most manufacturers will list the weight per foot in their catalog.

30 feet has about 11.94 cubic feet of whatever material the pipe is made of.

You can find the weight of the pipe if you know the brand and material as most manufacturers will list the weight per foot in their catalog.

30 feet has about 11.94 cubic feet of whatever material the pipe is made of.

Apr 07, 2010 | Mountain Plumbing Plumbing

3.14 x Diameter x Diameter / 4 x length= Volume in Cubic inches
Diameter and Length are in inches.

Multiply the above volume by 0.004 to get gallons.

Multiply the above volume by 0.004 to get gallons.

Jun 11, 2009 | Plumbing

That is your problem.

The plastic supply lines over time deteriorate and wind up causing the water to smell.

Replace the plastic line with a stainless steel ice maker water supply line available at any home improvement center. They are 1/4 inch inside diameter lines and fittings.

They come in 5/10 and 20 foot lenghts.

After you do this run about 2 gallons of water through the water in the door dispenser. Discard the first 3 drops of ice from the ice maker.

Your ice quality will improve.

The plastic supply lines over time deteriorate and wind up causing the water to smell.

Replace the plastic line with a stainless steel ice maker water supply line available at any home improvement center. They are 1/4 inch inside diameter lines and fittings.

They come in 5/10 and 20 foot lenghts.

After you do this run about 2 gallons of water through the water in the door dispenser. Discard the first 3 drops of ice from the ice maker.

Your ice quality will improve.

Mar 25, 2009 | GE Profile PFS22 33" Artica French Door...

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