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Why do they put the scuba tank in water while refilling it??

When scuba diviers take their tank to be refilled, the shop ppl put it in a tub of water while refilling it. does anyone know why?

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A scuba tank is design to hold a certain volume of air, at a particular at a particular temperature. In the US, the standard tank is an aluminum 80 CF tank. At room temperature and 3,000 psi, the tank holds 72 CF of air (yeah, I know they round up calling it 80 CF tank). When you are filling the tank, the air and tank will become warm/hot. If you check the pressure guage while the tank is warm, it will give you a reading of X. Once the tank cools, it will give you a reading that is less than X. They put the tanks in the water in the hopes of keeping the temperature do, and filling the tanks closer to the design pressure and temperature. Some examples that you can see... In Mexico, many of the tanks will be sitting in the sun while on the boat. The tank may have a reading of 3,200 psi. Once you jump in the water, and the tank cools down, the new reading may be 2,800 psi without ever breathing any of the air. I have been ice diving, the tank was acutally colder than the water. Since the water temperature was warmer than the tank, me pressure reading was slightly higher.

Posted on Dec 01, 2008


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Posted on Jan 02, 2017


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Morgan hot tub

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How to fix a refill valve

  • Brass-style toilet refill valves can often be repaired. To take a valve apart, remove the lever's screws. This allows you to lift out the float arm and valve plunger. Check the flat rubber washer on the end of the plunger. If it's worn, you can pull it out with pliers and either turn it around or replace it. This procedure usually corrects an overfilling problem. Next, reassemble the valve. If the tank continues to overfill, check to make sure the operating lever at the end of the float arm is functioning properly.

  • New refill valve. To replace the entire refill valve assembly, first turn off the water supply. The tank should then be flushed and sponged out, as detailed previously. Remove the inlet nut and riser tube from the bottom of the refill valve beneath the tank. Hold the refill valve inside the tank with a padded locking plier/wrench to keep it from turning, and remove the nut beneath the tank. With the nut off, the refill valve assembly can be lifted out and a new one inserted in its place. Follow the exact instructions included with the unit you purchase.

  • Finally, reconnect the riser tube and turn the water on. The tank should fill, allowing you to adjust the water level according to the instructions that were included with the valve.

  • Anti-siphon valves. The best refill valves offer anti-siphon protection. In fact, this may be a requirement. This protection prevents back siphonage of toilet tank water into your home's potable water supply system if a vacuum occurs in the toilet's water supply system. Whether or not this is a code requirement, the anti-siphon valve is a good idea to protect your family and public health.

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How often does sand need to be changed? Cloudy water a symptom?

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Toilet tank fills slowly

My sister has a two year old Jacuzzi toilet that worked fine until a few months ago. Then it started to take 10 minutes to shut off after each flush. I lifted the tank cover and immediately saw the problem; at least 90% of the refill water was going into the refill pipe instead of the tank. Upon examination I discovered that the plastic part that holds the flexible refill tube to the vertical refill pipe was broken. This part not only holds the refill tube in place, it also has a small orifice at the end to restrict the flow into the pipe. The part was broken in such a way as to let nearly all the water go into the refill pipe instead of the tank, hence it would run for 10 minutes after the toilet bowl was full and waste all that water. I found a small coarse thread stainless steel screw that fit into the plastic attachment piece to help plug the orifice and cut down the amount of water going to the refill pipe. Now the toilet flushes and refills in less than 2 minutes. I'm in the process of trying to find a replacement for that part but so far no luck.

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After flushing the toilet with the fluidmaster 300 installed, and during the tank refill, the refill valve emits an extremely high pitched squeal until just a second or two prior to the tank being...

hiya:) This is a result of a very minor design error (i am a big fan of FluidMaster products) combined w/a slightly higher than normal water pressure situation or foreign matter stuck in the valve somewhere. try turning down the water pressure via the shuttoff under the toilet tank:)

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I believe you have a high water pressure going to the
tank. Minimize the water volume going to your tank. This is done by fully closing the inlet valve under the tank. Then open about 1/4 to 1/3 of the inlet valve. To do this, count the number of turns to get it full close from full open position. For 1/4, divide the number of turns by 4 and divide it by 3, for 1/3 open. Hope this will solve your problem.

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I hope this helps

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1 Answer

Toilet tank is refilling slowly.

Hi AaronYC,

I'm Harvey the Master Plumbe.

Your problem is: Installed a new American Standard Cadet 3 toilet bowl and tank at home. When you turn the water supply on, the tank refills normally and stops normally. After you flush, the refill is very slow. When it refills normally the water comes out from the bottom of the pipe (i.e. the pipe that houses the float cup) and when it is refilling slowly, it comes from the top of the pipe. Sometimes (but not always), you can shut the water supply off and when you turn it back on, the flow of water goes from slow to fast instantly - but you haven't been able to recreate this consistently.

These are the facts. American Standard has been keeping costs down by out sourceing. Their toilets are now built in third world countries and parts are made cheap. They're all doing it. Quality control is pretty good but your toilet came with a bad "ballcock". That's the refill part on the left. Because it's new, if you take the ball **** back to place of purchase they should give you new. If not, they cost less than $ 10.00 and easy to replace.

Feel free contact me again!
Please give me a rating here at before you sign off
Thank you,
Harvey your Master Plumber

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1 Answer

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