Hydraulic tank suction discharge size?

[moored4]

No filter on suction side ever, have to be on return line...I would skip suction strainer too, but go for a fill cap strainer...

If you start with a clean system, this is the way to go, just monitor pressure drop over the return filter, get a housing with built in indicator...

Since you got this filter on the return line would you be watching pressure drop or pressure increase.

If you have a filter with one of those little pop-ups then your reading pressure not drop! Even if your installing a guage your reading pressure increase.
When mounted after the filter then you will only see atmosphere which is not an indicator of a dirty filter.

 

[AKKAMAAN]

Since you got this filter on the return line would you be watching pressure drop or pressure increase.

If you have a filter with one of those little pop-ups then your reading pressure not drop! Even if your installing a guage your reading pressure increase.
When mounted after the filter then you will only see atmosphere which is not an indicator of a dirty filter.

"Pressure drop" is a hydraulic slang term for pressure differential....sorry for the confusing...

If the pressure differential (drop) is low over the filter, it is not clogged....usually a spin-on filter manifold have a 15-30 psi by-pass valve that by passes flow when filter gets clogged with dirt...other wise pressure can increase till paper filter get damaged and contaminates the fluid in the tank...

Pressure is supposed to be almost 0psi (atmospheric pressure) down stream the return filter....I would put a permanent 0-50 psi gauge on the inlet to filter, and that way monitor filter status...

Also do not under size filter capacity, use filter that are 25-50% higher rated than pump flow...

 

[techman]

If you want to follow good design, go 1.5" to keep the suction velocity under 4"/sec, as stated earlier. This will also give you some margin in cold weather when the oil is thicker, and suction conditions degrade. Also do not use a suction strainer. More pumps have been ruined by dirt clogging a strainer, then strainers have saved. Also a baffle in a reservoir is nice if you have enough volume and room. Using a baffle, the suction and return flow should be on opposite sides of the baffle. If you do not use a baffle, have the suction and return on opposite corners, as much as is practical. This allows the oil to release any entrained air by traveling further.

paul

 

[KWentling]

If you want to follow good design, go 1.5" to keep the suction velocity under 4"/sec, as stated earlier. This will also give you some margin in cold weather when the oil is thicker, and suction conditions degrade. Also do not use a suction strainer. More pumps have been ruined by dirt clogging a strainer, then strainers have saved. Also a baffle in a reservoir is nice if you have enough volume and room. Using a baffle, the suction and return flow should be on opposite sides of the baffle. If you do not use a baffle, have the suction and return on opposite corners, as much as is practical. This allows the oil to release any entrained air by traveling further.

paul

Great recommendations. I would go for about a 15 gallon tank capacity.

Kim

 

[moose13]

Ok, please bear with me here just trying to do it right. The in and out ports on the splitter valve are 3/4" and the working ports are 1/2". If i do 1" suction from the tank and 1" return to the tank wouldn't that suffice? If i am wrong please explain, seems to me if the valve will only take 3/4" that any more than that is not used anyways? Also the filter housing is 1" in and 1" out. Plan on putting it on the return side.

I cut the pipe and plate for the tank today, so will add the ports tomorrow. I will update with some pics.

Thanks!

 

[J_J]

My thoughts on this is that you should use the same ID on the hoses as on the valve. There is some logic as to increasing the size if there is a long run of hose, and some say to use a larger hose on the suction side if using the machine in a cold climate.

 

[kubotakid USA]

If you want to follow good design, go 1.5" to keep the suction velocity under 4"/sec, as stated earlier. This will also give you some margin in cold weather when the oil is thicker, and suction conditions degrade. Also do not use a suction strainer. More pumps have been ruined by dirt clogging a strainer, then strainers have saved. Also a baffle in a reservoir is nice if you have enough volume and room. Using a baffle, the suction and return flow should be on opposite sides of the baffle. If you do not use a baffle, have the suction and return on opposite corners, as much as is practical. This allows the oil to release any entrained air by traveling further.

paul

Iam not intrested in starting any arguments, Iam just pretty set in my beliefs, That oil strainers are PUMP SAVERS,...And they are also called filters, And just like maintaining your tractor,car,etc IF YOU DONT DO REGULAR SERVICE LIKE FILTER MAINTENCE, THEN YOU SHOULD EXPECT PREMATURE FAILURES, If the pump is ruined besause the strainer is pluged, That CLEARLY indicates (no) maintence, Common sence tells you,..THAT A STRAINER, IS NEEDED,... OR It WOULDNT BE PLUGED IN THE FIRST PLACE !!! Eric

 

[AKKAMAAN]

Iam not intrested in starting any arguments, Iam just pretty set in my beliefs, That oil strainers are PUMP SAVERS,...And they are also called filters, And just like maintaining your tractor,car,etc IF YOU DONT DO REGULAR SERVICE LIKE FILTER MAINTENCE, THEN YOU SHOULD EXPECT PREMATURE FAILURES, If the pump is ruined besause the strainer is pluged, That CLEARLY indicates (no) maintence, Common sence tells you,..THAT A STRAINER, IS NEEDED,... OR It WOULDNT BE PLUGED IN THE FIRST PLACE !!! Eric

As long as the pressure drop over the strainer stays under recommended 0.5 to 0.7 psi (clean strainer), I can let you use one....LOL...if you also use a vacuum gauge on the pump inlet, to monitor the inlet pressure (vacuum)...should not be lower than pump manufacturers recommendation....usually not lower than 11.5-12 psi absolute pressure....14.7 psi=atmospheric pressure

The entire pressure drop, through the reservoir to the pump inlet, is an accumulation of each individual pressure drop from air breather, suction filter, each fitting, and each piece of hose and tube and each bend of hose.
So the argument that the port size on pump, valve or filter housing is deciding the size of hose/tube is wrong. The smaller port size, the more reason to up size the hose.

 

[kubotakid USA]

As long as the pressure drop over the strainer stays under recommended 0.5 to 0.7 psi (clean strainer), I can let you use one....LOL...if you also use a vacuum gauge on the pump inlet, to monitor the inlet pressure (vacuum)...should not be lower than pump manufacturers recommendation....usually not lower than 11.5-12 psi absolute pressure....14.7 psi=atmospheric pressure

The entire pressure drop, through the reservoir to the pump inlet, is an accumulation of each individual pressure drop from air breather, suction filter, each fitting, and each piece of hose and tube and each bend of hose.
So the argument that the port size on pump, valve or filter housing is deciding the size of hose/tube is wrong. The smaller port size, the more reason to up size the hose.

I agree that a vacume gage takes the guess work out, and is a necessary option, Also I think its nice to see how the cold starts affect the flow of oil, and further will suggest that your oil is too thick for the temp, assuming that you are sure the strainer is (clean) , Its like having a high pressure gage, only more Important,.. Ill admit Iam a gauge type person, And feel that they tell a story ONLY a gage can tell, :thumbsup: Eric

 

[AKKAMAAN]

I agree that a vacume gage takes the guess work out, and is a necessary option, Also I think its nice to see how the cold starts affect the flow of oil, and further will suggest that your oil is too thick for the temp, assuming that you are sure the strainer is (clean) , Its like having a high pressure gage, only more Important,.. Ill admit Iam a gauge type person, And feel that they tell a story ONLY a gage can tell, :thumbsup: Eric

Good you mention cold start, a good idea to get a suction strainer with a 2-3psi by pass valve