Rich Hampel wrote:

There is a valid doctoral discertation awating the person who solves
this dilemma ...

It is not a dilemma that keeps many boaters awake at night,
trust me.

Rick

In article t,
Rick wrote:

Rich Hampel wrote:

There is a valid doctoral discertation awating the person who solves
this dilemma ...

It is not a dilemma that keeps many boaters awake at night,
trust me.

Rick


It's keeping SOME boaters awake tonight ;-)

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

In article t,
Rick wrote:

Rich Hampel wrote:

There is a valid doctoral discertation awating the person who solves
this dilemma ...

It is not a dilemma that keeps many boaters awake at night,
trust me.

Rick


It's keeping SOME boaters awake tonight ;-)

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

In article ,
Rick wrote:

The element cannot possibly know what mechanism is used to
establish fluid flow through the filter. The only thing the
filter sees is rate of flow and as it clogs, differential.
Anyone who claims otherwise is ignoring some other factor or
talking BS.

ONLY if you're only looking at the filter.

The casing is a different story. For instance, I don't feel that the
Racor 500's center-screw, edge-seal casing could handle "high" pressure.
It "feels" safer to limit it to the 14.7# maximum vacuum differential.

In addition, the 500's plastic bowl seems quite adequate for up to 15#
suction, but I'm not sure I'd trust it to 15# (or more) pressure.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

In article ,
Rick wrote:

The element cannot possibly know what mechanism is used to
establish fluid flow through the filter. The only thing the
filter sees is rate of flow and as it clogs, differential.
Anyone who claims otherwise is ignoring some other factor or
talking BS.

ONLY if you're only looking at the filter.

The casing is a different story. For instance, I don't feel that the
Racor 500's center-screw, edge-seal casing could handle "high" pressure.
It "feels" safer to limit it to the 14.7# maximum vacuum differential.

In addition, the 500's plastic bowl seems quite adequate for up to 15#
suction, but I'm not sure I'd trust it to 15# (or more) pressure.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

You are probably thinking of a Hilsch vortex tube. I agree, they are
neat devices. For seaparation, a hydrocyclone would also be a
possibility, but I imaginge they do not get rid of the really fine
particles as efficiently as a centrifuge.

While looking around yesterday, I stumbled over an interesting device
here, which has no moving parts and works along the same lines:

http://www.quantum-dynamics.com/Centrifugal.html


"BW" == Brian Whatcott writes:

BW On 08 Jan 2004 11:23:20 +0100, Ole-Hjalmar Kristensen
BW wrote:

"R" == Rick writes:
BW ///

R This is all assuming you don't have access to a centrifuge which is
R really the best way to handle the process.


R Rick

Do you happen to know if there is any centrifugal separator on the
market suited to small boats? I cannot really think of any technical
reasons why not, but perhaps the market isn't there. Btw., I once had
a Scania truck diesel engine which had a centrifuge for its
lubrication oil. Judging from the amount of gunk it separated out of
the oil, it worked very well.


BW Now *that* is an interesting question!
BW The pneumatic tube freezer/heater comes to mind immediately.

BW I can't recall the appropriate name - but the principle is incredibly
BW simple: introduce the pressurized fluid tangentially to a short
BW cylinder, and at one end of the cylinder, the spinning fluid meets a
BW washer with a central hole - the lighter fraction goes through here.
BW At the other end of the cylinder, the spinning fluid meets a central
BW barrier, with an annular gap - so the heavier fraction goes through
BW here. You can make them with plumbing fittings and minimal
BW machining or filing.
BW With pressurized air, these gadgets separate cooled air from heated
BW air (though the power efficiency is not compretitive with
BW regular fridges...)

BW With pressurized fuel, this gadget ought to do a very creditable job
BW of spinning out water and particles....

BW Brian Whatcott Altus OK

--
This page intentionally left blank

You are probably thinking of a Hilsch vortex tube. I agree, they are
neat devices. For seaparation, a hydrocyclone would also be a
possibility, but I imaginge they do not get rid of the really fine
particles as efficiently as a centrifuge.

While looking around yesterday, I stumbled over an interesting device
here, which has no moving parts and works along the same lines:

http://www.quantum-dynamics.com/Centrifugal.html


"BW" == Brian Whatcott writes:

BW On 08 Jan 2004 11:23:20 +0100, Ole-Hjalmar Kristensen
BW wrote:

"R" == Rick writes:
BW ///

R This is all assuming you don't have access to a centrifuge which is
R really the best way to handle the process.


R Rick

Do you happen to know if there is any centrifugal separator on the
market suited to small boats? I cannot really think of any technical
reasons why not, but perhaps the market isn't there. Btw., I once had
a Scania truck diesel engine which had a centrifuge for its
lubrication oil. Judging from the amount of gunk it separated out of
the oil, it worked very well.


BW Now *that* is an interesting question!
BW The pneumatic tube freezer/heater comes to mind immediately.

BW I can't recall the appropriate name - but the principle is incredibly
BW simple: introduce the pressurized fluid tangentially to a short
BW cylinder, and at one end of the cylinder, the spinning fluid meets a
BW washer with a central hole - the lighter fraction goes through here.
BW At the other end of the cylinder, the spinning fluid meets a central
BW barrier, with an annular gap - so the heavier fraction goes through
BW here. You can make them with plumbing fittings and minimal
BW machining or filing.
BW With pressurized air, these gadgets separate cooled air from heated
BW air (though the power efficiency is not compretitive with
BW regular fridges...)

BW With pressurized fuel, this gadget ought to do a very creditable job
BW of spinning out water and particles....

BW Brian Whatcott Altus OK

--
This page intentionally left blank

On Fri, 09 Jan 2004 07:51:04 GMT, Jere Lull wrote:

In article ,
Rick wrote:

The element cannot possibly know what mechanism is used to
establish fluid flow through the filter. The only thing the
filter sees is rate of flow and as it clogs, differential.
Anyone who claims otherwise is ignoring some other factor or
talking BS.

ONLY if you're only looking at the filter.

We are only looking at the filter, not taking into account the casing,
plumbing, etc.

Steve

On Fri, 09 Jan 2004 07:51:04 GMT, Jere Lull wrote:

In article ,
Rick wrote:

The element cannot possibly know what mechanism is used to
establish fluid flow through the filter. The only thing the
filter sees is rate of flow and as it clogs, differential.
Anyone who claims otherwise is ignoring some other factor or
talking BS.

ONLY if you're only looking at the filter.

We are only looking at the filter, not taking into account the casing,
plumbing, etc.

Steve

Another good reason NOT to pull vacuum on fuels and other volitile
liquids is that if the vacuum exceeds the vapor pressure of the fluid
the liquid with boil (flash) or you will separate out the lighter
fractions (lighter weight hydrocarbons). If youve ever had a gasoline
that had 'vapor-lock' problems you'll understand this phenomenom. I
dont have by me at this time a listing of the vapor pressure range of
#2 diesel fuel but you must understand that #2 is a mix of various
fractions. From that standpoint alone and the potential of 'flashing
by vacuum application make vacuum a less conservative approach to fuel
delivery systems.