Back to filters .... HELP!

[xtal01]

So, you guys started me on the right path a couple of weeks back. Now that I a plumbing the system, I need to order a filter.

What was on the original unit was a Baldwin BT292. Hmmmm ..... from what I can tell this was the wrong filter. Rather than a hydraulic oil filter, this was a "full flow lube spin on filter".

I am thinking this means it was meant for filtering lubrication oil.

Maybe this will work for a hydraulic filter ???? It was put on the forklift by a reputable forklift repair/maintenance shop.

Just seems odd to me .... I can't even find any specification (beta) figures on it. Cheap at $12.

I tried to read up on the Beta ratio .... tell me if I got it right.

From what I read, most companies using a minimum beta ratio of 200.

So when I look at he Baldwin site they have two columns ... Beta 75 and 1000

Is the number under this columns the micron size that will be stopped at this ratio?

For example .... BT8842-MPG ... Beta 75 - 7 and Beta 1000 - 10.

So is this telling me that for all practical purposes this is a 10 micron filter (it will stop 99.9% of all 10 micron particles ... 98.7% of all 7 micron particle)?

It costs about $45

This seems "reasonable" as there is no filter offered in their charts with a Beta 1000 higher than 10. Pressure drop at 5 gpm (my expected flow)is 2 psi and at 10 gpm, 4 psi.

The next "jump up" seems to be BT8849-MPG .... Beta 75 - 5 and Beta 1000 - 10 .... $90 Pressure drop 4 psi at 5 gpm and 8 psi at 10 gpm.

To me this still looks like a 10 micron filter but will catch 98.7% of particles 5 micron. Not sure if it is worth twice the price for the same 1000 beta rating and only 2 higher at 75 Beta?

And then the question of the day ... is this clean enough?????

The two valve manufactures I am using say 1) (Parker) ISO Code 16/13 ... SAE Class 4 or better 2) (Brand) 10 micron or better

From a chart I found (hope it is correct) 16/13 is about an SAE (749D) 4 and 10 - 12 micron at Beta 100

At one point I was thinking I would filter my oil at a 5 micron level but 10 micron is the smallest particle size (assuming this is what the number in that column means) that any of the Baldwin spin on filters will stop.

So, did I get it right ????? Any filters I should look at other than Baldwin?

Thanks ..... Mike

PS .... link to the Baldwin filter page:

http://www.baldwinfilter.com/literature/english/1 brochures/Form453.pdf

 

[hydtools]

Mike,

http://www.searspartsdirect.com/model-number/200879/0094/1500280.html

Well, look at that. A Barnes pump on a Sears log splitter.

Ted

 

[xtal01]

So I did a bunch of reading again ....

It seems according to the information I found, there is no clear cut answer when to use an inline filter and when to use a return line filter.

From what I read ..... inline ( pressure ) filters have the advantage of protecting everything past the pump. All valves and cylinders are fed with clean oil.

The disadvantage was any contaminates picked up in the system will be dumped into the tank and thus run through the pump.

And thus the opposite is true with a return line filter ... everything gets fed dirty oil from the tank ( and as was pointed out if the pump fails, everything gets hit ) but the oil in the tank should be clean and the pump should see only clean oil.

The elements are about the same price .... $45 spin on and $60 cartridge.

The housing is more .... $75 VS $400

So, is there a clear cut answer as when to use which one?

Thanks ..... Mike

 

[MikeHalloran]

No law says you have to use just one type of filtration.



Mike Halloran
Pembroke Pines, FL, USA

 

[hydtools]

If you are really fussy, use both. And maybe even a suction screen in the tank to catch the bolts and nuts.

I see the return line filter as a cost-effective (most benefit for the money) way in most power systems to keep the system clean. The rest is based on how strongly you feel you need to protect against the 'what if's.

Ted

 

[xtal01]

I do agree ... although this project has been an awesome learning experience, I have let it get totally out of hand.

When I think of the original forklift ... wrong spin on filter, petroleum based fluid, dirty factory environment ... and still it has worked for 30 plus years. From what I can tell, all the valves were original.

I do want to do the best I can take care of the system.

I agree, a good quality spin on filter will give me my best "bang for the buck".

The synthetic oil should give good protection for the pump and seals.

I truly appreciate all the input you guys have given me on this project!

Thanks ..... Mike