Hydraulics Flow questions. 22gpm pump and 1/2" ports??

[oldnslo]

LD1,
22 GPM through 1/2" schedule 80 pipe is around 6 PSI/foot pressure loss. If you are using 5/8 or 3/4" hose you will not see any loss of speed or performance with 1/2" connections on the cylinder presuming they do not have any reduced hole size into the cylinder bore.

 

[LD1]

You could call Baileynet who make cyl and ask them about the option of changing port sizes and the effect it will have . They probably have engineers that know that kind of data.

You could put a flow meter and pressure gage in the circuit and determine the outcome of modifying the ports.

I did call them and not sure who I spoke with, but they said things should be fine with 22gpm and 1/2" port. And also inquired about custom cylinder with larger ports and possibly larger ram. Without going through all the details, he said custom cylinders start at $500 or $600 minimum (cant remember for sure), and go up from there. So that is out. I would rather but a 4" cylinder for $200 and enlarge the ports myself.

LD1,
22 GPM through 1/2" schedule 80 pipe is around 6 PSI/foot pressure loss. If you are using 5/8 or 3/4" hose you will not see any loss of speed or performance with 1/2" connections on the cylinder presuming they do not have any reduced hole size into the cylinder bore.

Thats sort-of the confirmation I am looking for. Wanting to make sure I wont suffer a big speed loss with 1/2" ports flowing 22gpm. And even if I loose a little, like down to 18 or 20GPM, I will still stick with the 22gpm pump cause in low speed it still flows 7gpm. But a 16gpm pump in low only flows 4-4.5gpm. So still worth getting a 22gpm just for the low speed flow rate.

 

[oldnslo]

LD1,
As long as the pressure seen at the pump outlet is less than the switch over point from hi flow - low pressure to low flow - high pressure you will not see any speed loss. Depending on pump brand model, etc this switch point can range from 600 - 800 PSI or possibly more.

 

[SPYDERLK]

LD1,
As long as the pressure seen at the pump outlet is less than the switch over point from hi flow - low pressure to low flow - high pressure you will not see any speed loss. Depending on pump brand model, etc this switch point can range from 600 - 800 PSI or possibly more.

.... And losing around 10psi at the ports instead of 3 with larger ports just wont be any issue. An extra droplet of gasolene per cycle. :confused3:
larry

 

[CJONE]

1/2" pipe actually has a ID of close to a 3/4" hose fitting. Anyway like JJ said use sweep 90 and 45deg fittings and you will have no problem. Most valves are only rated for 25 gpm and that is where your main restriction is at. The last splitter I built for myself had a 22gpm pump and you could run that thing all day with no heat issues. 1/2" work lines, 3/4" pressure and a 1" return line, 15 gallon res and no cooler, the hottest I had it to was 140 deg after about 3+hours of continuous use. CJ

 

[LD1]

1/2" pipe actually has a ID of close to a 3/4" hose fitting. Anyway like JJ said use sweep 90 and 45deg fittings and you will have no problem. Most valves are only rated for 25 gpm and that is where your main restriction is at. The last splitter I built for myself had a 22gpm pump and you could run that thing all day with no heat issues. 1/2" work lines, 3/4" pressure and a 1" return line, 15 gallon res and no cooler, the hottest I had it to was 140 deg after about 3+hours of continuous use. CJ

Thats good to hear. But I have a few more questions about that splitter...

22gpm pump and 1/2" lines. Was it homemade? and what size cylinder were you using on it?

 

[buickanddeere]

Is splitting wood a race?
What kind of wood? Some is tough to split and a 5" ram is sometimes required.
With a pump and motor that size , it's going to travel like a rat trap.
Is it a constant gpm pump or one of those high flow-low pressure pumps that swap to low flow-high pressure when heavily loaded?

 

[buickanddeere]

As previously stated. The line size to really be concerned about is from the sump or reservoir to the pump inlet. It's only atmospheric pressure feeding oil into the pump.
Can't pump oil out of the pump if it can't get into the pump.
Where is the filter-strainer? That could be of more concern than 1/2 or 3/4 pressure lines.
Better if possible to have the reservoir above the pump rather than below.

 

[LD1]

Not a race, but when splitting 20+ cord a year, I like to be productive. And the 4.5" ram 11gpm combo on the husky is just too slow. I would rather the splitter be waiting on me than the other way around.

I have split probably 150 cord of all kinds of hard wood in the last 10 years. Elm, oak, maple, etc. NEVER had anything the 4.5" cylinder wouldnt bust. So I see absolutely no need for a 5" ram.

Its a 2-stage pump. With 22gpm high flow, and 7gpm on the low.

Reservoir WILL be above the pump. And the inlet size is limited by whatever the pump inlet is. Which is 1" IIRC. And will likely run 1.5" line to it since that is what I already have from another project. So the only restriction in suction will be the pump itself.

Filter will be a return line filter with bypass. No issues there.

And pressure lines WILL be 3/4". I dont have any other concerns at all. Just the 1/2" ports in the cylinder is all.

 

[CJONE]

Thats good to hear. But I have a few more questions about that splitter...

22gpm pump and 1/2" lines. Was it homemade? and what size cylinder were you using on it?

Yes, I built it myself. I used a 4" bore cyl 24" stroke set at 3000psi. The 4" bore was for speed and the pressure gives me the force to split just about anything. You could put a chunk of 10" maple sideways and it would cut it in 2. Most splitters say they build 3000psi but normally not when you put a gauge on them. Anyway use a sharp wedge with kickers on the back side, that worked the best for me. Think of a Y shape. It was built out of 1/2" plate. I am still hesitant on the 22 GPM pump it may have been a 28, can't remember 100%. Anyway any questions just ask.
Oh 1 other tip, put your valve or splitting handle just above the rod end cap on the cylinder. YOU want to be running the valve because this combo is fast and you don't want to loose any body parts. Mine would cycle out and back in less than 7 seconds. 4 out and -3 in. Buddy would not run it, said it scared him!! Just perfect. IMHO.