Re: linear piston pumps

[Tony Terceira <terceira at ride_ri.net>]

         Do not bleed off air with these linear pumps, you are forcing them 
to work harder.  the piston adjusts  to the back pressure in the 
system.   I was bleeding mine and Jehmco informed me that I was not using 
the pump efficiently.  have shut off all bleeding and pump ( 80 watt) has 
been running for 2 years non stop







At 06:06 PM 7/20/02 -0400, you wrote:
>I recently bought the smallest sized Jehmco pump (26 watts). I mostly
>wanted to save electricity and figured it would be adequate for my needs.
>So far is has plenty of air to drive airstones and sponge filters in:
>
>14 - 10 gallon
>6 - 15 gallon
>5 - 20 longs
>1 - BS hatchery
>
>I leave one of the extra valves pretty much wide open to bleed off the
>excess air, and some of the other valves are obviously leaking (I hear the
>hiss). I'm not sure I could run twice as many tanks, but I'm sure I
>could add another 10 or so without any problem. Notice, all these tanks
>are only 12 inches deep, and I think that's why I have excess air.
>
>If you are not sure you need even this much air, I'd suggest you get a
>regular pump like the Rena 400 several people have raved about, and build
>your air distribution system with 3/4 inch PVC and quality valves. If you
>find that the pump is not powerful enough to drive all your tanks, then
>get the linear pump from Jehmco. I think you'll be amazed at how much air
>one of those Rena pumps can produce if the distribution system is really
>good. Pumping air through airline tubing requires a lot more from the pump
>than if it goes via PVC pipe. I try to make the final runs to the tanks
>as short as possible.
>
>Dennis
>
>  On Sat, 20 Jul 2002, William Ruyle wrote:
> > I would like some info from end-users on those Japanese pumps Jehmco 
> sells. What's
> > there longevity, how much upkeep, and what's the minimum # of tanks to 
> even consider their smallest model. Thanks in
> > advance for any advice given.
> > Bill
>
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Tony Terceira
terceira at ride_ri.net

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