Replacing tank on vfd

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Greenmonster304

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The tank for my vfd started to leak so I want to replace it but I am not sure what pressure to charge the new tank to. I wasnt sure if the vfd tanks get charged differently. Thanks in advance for your help.
 

JPat

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Hmmm. Every VFD we have installed, the manufacturer recommends 70% air pressure to running pressure...Doing the math for you; if your running pressure is 60psi the pre-charge in the tank should be 42psi.
 

JPat

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Meh, tanks go bad all the time. The rubber that most companies are using is recycled... "Do it yourself" tanks have a high failure rate as well. 5yr warranty on all tanks!!!
 

Valveman

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Bladder or diaphragm type tanks only go bad for two reasons. Either they rust through, or the bladder breaks. Most of the busted bladders I see on tanks with a VFD, are from the pump not shutting off when it should, causing the pressure to spike and bust the bladder.

One of the big box stores has a 32 gallon tank with a lifetime warranty. I guess it doesn’t have recycled rubber.
 
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