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Re: Blower
Posted By: John Dragun In Response To: Re: Blower (SVP Neon Equipment)
Date: Thursday, 15 December 2011, at 12:51 a.m.
> As you probably know, I have been a
> proponent of Roots-type blowers for years.
> This is mainly due to the volume vs.
> pressure vs. cost (relative to the available
> pressure for a given size blower). So,
> because I like very hot fires, and need
> pressure and volume without breaking the
> bank, I have used a Roots. Further, because
> I use oxygen injection in my neon burners, I
> need the pressure of a Roots. I have never
> liked the noise they make and never will;
> they are loud! The other downside is when
> they get old the seals between the gear case
> and air chamber get hard and brittle. Those
> using a Roots may never have a problem, but
> I did. When the seal blew out it pumped oil
> all through my airlines. Believe me when I
> say this is NOT something you want to
> happen! Because regenerative blowers are
> oil-less, this will never happen with them.
> So if you have an old Roots-type blower that
> has never been a problem for decades, you
> may want to seriously consider having it
> rebuilt, or at the very least have the seals
> replaced.> The standard regenerative blowers that have
> gained favor with many neon shops are much
> more quiet than a Roots. They are a single
> stage design, usually on the order of ~40 to
> 90 CFM. Gast, Fuji and Ametek are a few
> names that immediately come to mind, but
> there are others. The problem with these is
> that they do not put out sufficient pressure
> (IMO) unless you get into the 125+ CFM
> range, which is way too much volume for 1 or
> 2 sets of fires. Of course the larger the
> blower, the more it costs and the more noise
> it makes. (A 125 CFM regenerative blower is
> not cheap by any means.) Two stage
> regenerative blowers are available that
> produce sufficient pressure in a smaller CFM
> rating, but they are expensive too.> However, I have recently located and started
> selling a single stage regenerative blower
> that is rated at 68 CFM and 18 kPa (2.6
> PSIG). I have personally measured one while
> running with some blow-off and got 2.5 PSIG.
> So completely blanked off I’m sure it would
> make 2.6 PSIG. Currently the price of these
> is $495.00, which may be more than a used
> $200 eBay special, but about 1/3 the cost of
> a new comparably sized Roots. Plus you get a
> warranty!> As an alternative, you can use Larry’s
> suggestion of using a larger Medo pump for
> the cross fires, pick up a smaller Medo pump
> for your hand torch, and get a small
> regenerative blower (25-30 CFM) dedicated to
> the ribbon burner.> Mark
As always, Mark, you have all the knowledge i am looking for. I really don't want more than one pump, I have two hand torches a cannon and a ribbon, and burn them all, almost all the time. so one pump is much better then 3.......When I get some down time I may rip this old roots down and rebuild it, and look for a backup one on e-bay. I have no problem rebuilding these, or vacuum pumps, so I think that may be the way to go once I figure out what brand this one is :). It's outside in a little house for itself under the snow......
John
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