Pump selection help needed for tank circulation...
Pump selection help needed for tank circulation...
(OP)
I have a 50 gallon tank containing a Black Oxide chemical solution for blackening metal.
Tank operating temp is 200 deg F.
the MSDS for this solution shows:
Sodium Hydroxide <30%
Sodium Nitrate <10%
Sodium Nitrate <1%
This concentrated basic solution gets mixed 50-50 with water.
I would like some help on selecting a suitable pump (or maybe something else?) for circulating this tank for even temperature dispersal.
Right now all i have in the tank is water, and there is a huge temp difference between the top and bottom of the tank, I was thinking of an external pump that would take the hot fluid from the top of the tank and pumping it down to the bottom.
This pump would be in continious operation pretty much all of the time, so something reliable with a long life span would be what I'm after.
Any help would be greatly appreciated.
Tank operating temp is 200 deg F.
the MSDS for this solution shows:
Sodium Hydroxide <30%
Sodium Nitrate <10%
Sodium Nitrate <1%
This concentrated basic solution gets mixed 50-50 with water.
I would like some help on selecting a suitable pump (or maybe something else?) for circulating this tank for even temperature dispersal.
Right now all i have in the tank is water, and there is a huge temp difference between the top and bottom of the tank, I was thinking of an external pump that would take the hot fluid from the top of the tank and pumping it down to the bottom.
This pump would be in continious operation pretty much all of the time, so something reliable with a long life span would be what I'm after.
Any help would be greatly appreciated.





RE: Pump selection help needed for tank circulation...
RE: Pump selection help needed for tank circulation...
RE: Pump selection help needed for tank circulation...
There is not much room in the tank when the chainsaw bars get dipped in.
RE: Pump selection help needed for tank circulation...
If you do go for a centrifugal pump, I would recommend a low speed pump for several reasons, namely the lower PV values on the mechanical seal (sealed pump) or plain bearings (mag drive). The cheaper neo magnets used are temperature sensitive, so you may need to compensate for them (they lose strength and higher temps, but if the pump was designed appropriately, you shouldn't have much of a problem at 200. Get above 250, and SamCo magnets are much better. Also, low speed pumps last longer as the bearings don't have near as much load (assuming sotck motors, etc) on them.
All things considered, in a sealled pump the only wear item is the seal. The pump should last a long time, but you may have to spend $200 or so every 6 months or so on a seal.
RE: Pump selection help needed for tank circulation...
Can somebody concur with what was suggested?.
many thanks
RE: Pump selection help needed for tank circulation...
RE: Pump selection help needed for tank circulation...
RE: Pump selection help needed for tank circulation...
In relation to the Mag Drive pump these pumps are quite sensitive to the bearings running dry. Cavitation is also a problem. You may be getting more problems than you are solving.
HEC
RE: Pump selection help needed for tank circulation...
RE: Pump selection help needed for tank circulation...
RE: Pump selection help needed for tank circulation...
RE: Pump selection help needed for tank circulation...
Primary component is a big PVC sweep ell, of the kind they sell for plastic conduit, 2" size or bigger. This is suspended in the tank with one leg horizontal and one leg pointed down, flush against a side or an end.
Second major component is a little porous plastic throwaway air line muffler, 1/4"NPT or so, suspended just inside the distal end of the vertical leg of the big ell and supplied with compressed air at ~<3 psi. An air line regulator with 1/4" npt ports is plenty big enough.
Set the regulator so there is just enough pressure to offset the static head at the muffler. The muffler emits a fine cloud of bubbles, which travel upward within the big elbow, then emerge in a stream from the horizontal leg, inducing a nice circulation around the tank, while drawing dense liquid from the bottom.
You'll be amazed at how effective it is, and how strong a circulation it can induce.
The ones I made for our acid pickling and passivation tanks were actually supported by the air feed, an inverted 'J' constructed of 1/4" sch80 PVC pipe and fittings, with the vertical leg stuck through a milled hole in the outer radius of the big PVC ell. Next time I'd use a bigger, stronger air feed or put the whole thing in a sturdy box; our guys managed to destroy all of them in less than a month by dropping heavy workpieces on them. Maybe your gorillas are more gentle.
Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA
RE: Pump selection help needed for tank circulation...
I wish there was room in these tanks for some of the ideas you guys mentioned.
http:
http:
the only room i can use inside these POS tanks is pretty much just below these heaters.
Thanks for all your help guys!.
RE: Pump selection help needed for tank circulation...
http://www.sethco.com/html/mag_3.htm