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tank changing pressures

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depackers91 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote depackers91 Quote  Post ReplyReply Direct Link To This Post Topic: tank changing pressures
    Posted: 06 March 2005 at 6:08pm
I have a 68/4500 tank and ever time i get it filled the gauge reads 4500 but after a few hours i checked back and the gauge read around 3600 psi.

Is ther someone thing wrong with the tank or is this normal?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BobbyG Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2005 at 10:43pm
It can be normal. If you fill a tank too quickly that will happen everytime. I would not be worried unless it bleeds all the way empty everytime.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote depackers91 Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2005 at 2:45pm
its dosent get empty it just sits at around 3600 but i still would like to have a better fill
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Post Options Post Options   Thanks (0) Thanks(0)   Quote triggerhappy1 Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2005 at 2:55pm

This is called a "hot fill". At high pressures, air can very easily create friction because of the high pressure rapidy through a small area. And it can become warm which easily happens when filled. And if the air in your tank right after a fill is warm or hot, it is expanded due to heat. But when it cools down, the pressure drops because the air molecules contract.

This can easily be avoided by slow, carefull fills. Next time you get a fill, ask them to slowly fill it because you do not want a hot fill.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote LordJovian Quote  Post ReplyReply Direct Link To This Post Posted: 08 March 2005 at 8:26am
Hot fills keep damaging my fill nipple o-ring, so if I were you check to see if it's leaking at all.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote evil_fingers Quote  Post ReplyReply Direct Link To This Post Posted: 09 March 2005 at 3:52am
There is something you should be concerned about you fill....who is filling your tank...is it jus you or is it the guy at the field or shop?
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