# I've made a 10m water level using two 5m lengths of clear 6mm internal diameter pipe joined in the middle with a proprietary tube connector. I looped the tube with both ends next to each other and the centre much lower. I filled the tubes with coloured water and made sure all the air bubbles escaped but the liquid fails to equalise in the two tubes! Both tubes are open to the atmosphere but the level in one is about 50mm above the other! I've repeated the filling procedure about 10 times now with the same result, any ideas?

Posted by on

### Obertelli

• Level 3:

An expert who has achieved level 3 by getting 1000 points

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

An expert that has over 10,000 points.

• Master

The internal diameter is notional and if the two lengths you have used came from different production batches then their average internal diameter along the length of one half may be different to the other. The fact that there is such large ratio between the length of the tube and the internal diameter only makes matters worse.

You need ideally to source a single 10m length and to select a larger internal diameter to maximise accuracy: 10mm i/d will be better but if you can cope with the extra volume of liquid then 15mm or even 20mm will be much more accurate.

Posted on Jul 28, 2010

×

my-video-file.mp4

×

## Related Questions:

### Can you help me i need a pump that will produce 1 GPM thru 250' x 1/2" tubing @ 10psi

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.

Jan 19, 2018 | Plumbing

### I have a Hoover Contour HE430TF fridge leaking water to the bottom of the crisper. There is no internal drain hole. Hoover has no record of a 20 yr old model & is no help. How can I fix the problem?

it's not leaking water.. it's condensation running down the back of the fridge.. normally this is channelled into a hole that has a tube on it, that allows the water to go to a drip tray on top of the (warm) compressor, which then evaporates it.. Please re-check for a "V" shape moulding on the back if the fridge.. there SHOULD be a hole smack bang in the middle, which may have clogged up in the pipe with gunk, causing water to refreeze and block the hole completely.. best to do a full empty and clean, and use a chopstick, or better still a cheap pipe-brush from the £ shop, to clear that tube (about 1/2 inch diameter, or maybe less.)

Apr 24, 2017 | Hoover Refrigerators

### What is a water level

A water level is a long clear tube filled with water within a couple of inches at either end.( No limit to length.) Mark water level at one end and hold it to what you're measuring. Walk the tube to the next spot and hold it up When the water is at the same spot on the end tube, both spots are the same level. I think the Egyptians used a version of this to build the pyramids.

Jun 30, 2014 | Measuring Tools & Sensors

### The water dispenser is not working. I here a click but the water is not being pumped. It is making ice. I have replaced the filter. I have confirmed the reserve the line is not frozen.

I often find this if I put my ice compartment onto high setting that the feed line freezes quickly. If you are sure this is clear (you can get water through the entire length via other means) then I would trace back to the start of your pipes look for leaks at joins from source to outlet, blockages/crimps etc. I also found on one of my lines that the transition near the door hinge was both leaking and crimped.

Remedy = I bought a larger bore plastic tube that would not quite press fit over it and bored it out lengthways with a drill bit the same diameter as the outer diameter of the pipe to perform a splice. The reaming leaves some debris which helps seal everything and if you get a good 3" overlap you will be water tight. I recommend to use an elbow rather than an in-line connection if your pipes change direction but be careful where you choose to put it. other than that if your model uses a pump? Beyond that, I am stumped.

Dec 28, 2013 | GE PFCS1RKZSS Bottom Freezer French Door...

### I need help finding a waterproof connector for a shielded coax wire approx. 5/32" in diameter.

If you cannot find a water proof connector from a radio parts shop may be you should consider using some shrink electrical spaggetti . Cut a length and place it over the cable--connect up the connector then shrink the tube down onto the cable around the connection. It will be as water proof as you will get. Only problem is that if you want to disconnect and reconnect the fitting you will have to replace the tubing.

Sep 22, 2013 | Cars & Trucks

### How to change the hose that leads to water dispenser. has a hole and is located on the back of refrige

Hello,
Typically that line is 5/16 diameter and depending where its broke a connector can be used to to cut out leaking section and use connector to join. The part number for the 5/16 inch connector is WR02X11330 typically the tubing to icemaker(not door dispenser) is 1/4" diameter and it is sold at Lowe's HomeDepot ect ect usually they dont sell the 5/16" diameter but in some case have both the tubing and connectors in stock. The connector part number i gave you(WR2X11330) can be purchased from your local appliance parts store if Lowe's HomeDepot doesn't have it. This link http://www.go2marine.com/product.do?no=52075F&WT.mc_id=gb1&utm_source=googlebase&utm_medium=productfeed&utm_campaign=googleshopping sells the tube by the inch their part# for it is 52077 MFR#1500566FT

Gene

Aug 12, 2011 | Kenmore Refrigerators

### Water takes 30 sec to cover 10m from heater to tap

body { background: #FFFFFF; margin: 0px; padding: 4px; font-family: arial, verdana, sans-serif; font-size: 10pt; } p { margin:0px; padding:0px; } .spwrap { background: transparent url(/wysiwyg_rte/misspell.gif) repeat-x scroll center bottom; } You are talking about length of time to get hot water from water heater.What diameter pipe are you talking about? What type of faucet do you have?
1/2" pipe has inside diameter of .54" and holds 1.2 gallons per 100 feet
10 meters is 32 feet and holds .4 gallons
Average faucet puts out 2 gallons per minute, so 30 seconds you should get 1 gallon of water.
Put a bucket under faucet and check amount of water flow.

Assuming you draw just hot water from the faucet, then 30 seconds is slow for receiving hot water.
If you have single-handle faucet and raise handle straight up in middle, then you are drawing half hot and half cold, so it would take 30 seconds for hot to arrive.

If hot water is slow, the problem might be crossover.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Low-hot-water-pressure.html
Other problems could include clogged water filter, clogged water softener, defective pressure valve, and low water pressure.

Sources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/Water-heater-recirculation-system.html

Jul 10, 2011 | Bosch Outdoor Gas Tankless Water Heater...

### Can i bypass the heater core?

Yes. You would need to join both hoses from the firewall into a loop to circulate the water back into the engine. You will need to measure the hose sizes and make a connector. You will need to clamp the hoses to the connector.

If you use copper tubing, you should flare the ends to insure a good seal.

May 09, 2010 | 1995 Ford Escort

### Volume of water in pipe work

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.

Jun 11, 2009 | Plumbing

### Diplomat 8512 Washing machine - water spilling out of detergent tray? Here's hoping for a simple solution.... When I start any program the water fills up the drum and then starts to pour out of the...

This is a problem with the pressure system usually caused by a build up of powder residue but can be caused by other blockages. Remove machine lid and locate pipe which is about 6mm in diameter. follow pipe down which will lead to pressure bottle. Clean out and replace and should be ok. If bottle is clear check pipes for other blockages and check preesure pipe for damage.

Nov 07, 2008 | Washing Machines

## Open Questions:

#### Related Topics:

54 people viewed this question

Level 2 Expert

Level 3 Expert