I gave up on "primary" and "secondary" to describe filters... I use
"initial" and "final" to describe mine. Oh yea, there's the polishing F-1
filter that works great!

"Doug Dotson" wrote in message
...
But the reality is that these things do work. There is tons of
annecdotal evedence. Please explain to me how it is that after
hours of polishing, the TP element is black with gunk and the
2uM Raycor following it still relatively clean. I really don't need
all these specs to allow me to believe what I can see with my own
eyes. Plus having the 2 uM Raycor at the end gives me a safety net
in case any of the little bugger sneak around the TP. Then another
couple filters (Raycor + engine filter) further protect the engine.

Is the filter on the engine the Primary or Secondary. DIfferent folks
seem to use different terminology.

Doug
s/v Callista

"Rich Hampel" wrote in message
...
Thats entirely untrue (Im being 'kind' here)

If you generate a bacterial slime/gel, that slime will 'de-polarize'
and block the flow based on surface area. Just compare the surface of
an open spaced (pleats not toughing together) pleated filter versus the
surface area of a cylindrical paper roll.

Also show me ANY data that you have on removal capacity on a per weight
basis vs. particle retention for a "roll of paper" filter.
You can of course document to an industry wide standard OSU F-2 test
stand test regime ???? I think not.
Do you have any retention efficiencies versus face velocity or
gpm/psid??
Whats the wet-strength of a roll of Charmin? Bounty? What is thier
average retention rating?


If you cant, its just SNAKE-OIL.







In article , Keith
wrote:

You need to look at depth filtration for polishing vs. surface
filtration
like the Racors. They will clog up very fast if you have dirty fuel.
See
the
link I posted earlier, and take a look at depth filters like the GCF
F-1
or
Jr.

"Doug Dotson" wrote in message
...
I don't have a filter problem, I have a pump question.

Doug

"Lew Hodgett" wrote in message
hlink.net...

"Doug Dotson" writes:
I am designing a fuel polishing and transfer system. My thought
is to use valves to route fuel from any tank to any tank. No
problem with that part. I want to be able to just transfer fuel
or switch in a filter to polish the fuel while transferring.
Since
I can select the same tank for source and destination, I can
polish fuel in place as well. The problem comes with the
selection
of a pump. I was looking at a Groco or Jabsco pump which seems
good for transfer purposes, but way exceeds the flowrate of the
filter when polishing. A Walbro fuel pump (which I have as a
priming
pump now) seems like a good fit for polishing (33 GPH) but will
be
slow
when just transferring fuel. What happens when a 5.5 GPM pump
(Jabsco) is pushing fuel through a filter rated at 60 GPH (RACOR
500)?

Have built the system above which BTW, uses a lot of 1/2" bronze
ball
valves.

You solve the filter problem in a straight forward fashion.

Multiple filters (Larger than 500) in parallel to reach at least
60
GPH.

I'd built in a safety margin and shoot for at least 75 GPH.

HTH


--
Lew

S/A: Challenge, The Bullet Proof Boat, (Under Construction in the
Southland)
Visit: http://home.earthlink.net/~lewhodgett for Pictures