Greenmonster304
New Member
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.
Replacing tank on vfd
- Thread starter Greenmonster304
- Start date
The tank precharge is usually about 30% less than the running pressure.
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JPat
New Member
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.
Hi JPat. Doing the math I think 70% of, or 30% less than 60 is still the same 42 PSI. The real question is why did the tank go bad?
JPat
New Member
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!!!
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.
One of the big box stores has a 32 gallon tank with a lifetime warranty. I guess it doesn’t have recycled rubber.
Texas Wellman
In the Trades
"Lifetime warranty"...when it breaks, the life is over!!
Greenmonster304
New Member
The tank rusted out because it was in a pit that was always damp.
Good to know. These are the kind of installations that can benefit from a fiberglass tank.
Yeah "lifetime warranty". Can you believe that? I think the company might just change names every few years to get out of warranties.
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