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Rickkrus
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# Posted: 26 Aug 2019 06:38pm
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I'm planning on storing water in a 270 gallon tank running into a 20 gallon pressure tank then through the cabin. Does my main tank need some type of bleeder valve to equalize air pressure as water is drawn out?
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darz5150
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# Posted: 26 Aug 2019 06:58pm
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I would think so. If it is air tight. You might get vapor locked.
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Atlincabin
Member
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# Posted: 26 Aug 2019 09:14pm
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Or you might collapse the big tank. Most of the big plastic water-specific holding tanks have a pressure relief valve built into the top. I'm presuming you are not pressurizing the big tank.
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ICC
Member
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# Posted: 26 Aug 2019 09:23pm
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The big storage tank needs a vent to both allow air to exit when you fill it and to let air in when water is removed. Sure if filling involves removing a cap and sticking a hose in that opening allows venting. However, a couple of my cisterns have the inlet and exit piping configured in a more or less closed system with valves and or pumps between them. If liquid is added to or removed from a tank provision must be made for air flow. I use a rule of thumb that says the vent line should be no less than one half the diameter of the water inlet or drain pipe. Works for me.
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Aklogcabin
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# Posted: 27 Aug 2019 09:44am
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I believe it is called a sniffer valve.
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KelVarnsen
Member
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# Posted: 27 Aug 2019 09:52am
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Not exactly answering your question, but somewhat related...I've been following this couple's off grid construction on YouTube for a bit and they just did a nice job installing a pressure tank. Might find something useful on their channel: Wild Wonderful Off-Grid.
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