Hyd hose diameter

[Mace Canute]

According to that chart, 3/16" hose performs better than 1/4" hose on total psi loss, heat gain and horsepower loss. I would have expected to be worse. What gives?

 

[AKKAMAAN]

According to that chart, 3/16" hose performs better than 1/4" hose on total psi loss, heat gain and horsepower loss. I would have expected to be worse. What gives?

Thats my point....I do not trust these online calculators....that's a big bug in that 1/4" calculation......the other numbers for 3/16" and 3/8", 1/2" correlates well though

 

[Chilly807]

Thats my point....I do not trust these online calculators....that's a big bug in that 1/4" calculation......the other numbers for 3/16" and 3/8", 1/2" correlates well though

I feel the same way, some free stuff works great, others not so much. It makes me wonder what's going to happen when a lot of the old-time guys with experience retire and we're at the mercy of youngsters that want to just plug the numbers into a computer and we pay for the results.

I know there's an increase in restriction over a longer hose of the same diameter due to friction, there has to be. Whether it's SIGNIFICANT or not is another matter.

There, I used it too...

Sean

 

[jake98]

Cylinder with two 20' x 1/4" hoses drops the rpm from 2000 to 1800, about 50 less than the loader does.

 

[AKKAMAAN]

Cylinder with two 20' x 1/4" hoses drops the rpm from 2000 to 1800, about 50 less than the loader does.

Is that with or without load on the cylinder?
compared to the loader with an empty bucket?
What size loader?
etc etc....

That rpm drop do not say so much when we do not know the friction and load in the cylinder. It might say more about engine/motor...

The pressure differential between the and of the hoses 2x20' with no cylinder, is what we need to say any about the power loss in the hose...

If a gauge (0-3000psi to start and the switch to a 0-1000psi, or smaller if possible) sits at the front of the 2x20' hose (no cylinder), and the other end into tank. If we get the pressure and a good number on the flow, and we can tell the power loss.

 

[J_J]

jake98,

You already know what the engine rpm will do, What kind of power loss are you looking far. If you lose pressure, you lose some force. Is the force satisfactory now, or do you want more? Do you want more speed from the cylinders?

 

[jake98]

I'm going to use it to yank stumps, so I don't care how slow it goes. I was thinking that since it slows the rpm less than the (empty) loader does, that's a good thing. The loader actually has a grapple on it that's a bit oversized, so it's not really empty.

 

[J_J]

How large a cyl are you planning on using. Even the large track hoes with very large cyl have trouble pulling stumps. I assume you are planning to use chain attached to a cyl to pull the stumps. Check the test rating on the chain. You can figure the force on the cyl.

 

[SPYDERLK]

I would love to see Bill (wdchyd) or someone else with a "shop", to set up his pump and flow meter test rig, and push 0-20 gpm through a 10ft long 1/4" hose with 2 straight fittings. Same test with a 20ft hose to determine the impact of length. Same test with 1/2"x10ft to determine impact of size. Pressure gauge T'd in front of the hose and the other end into the the tank fill hole. Document oil viscosity grade and operating oil temperature. That video documentation would show the truth!

[[With a 1/4" hose, I guess somewhere between 250-500psi pressure at 12 gpm...]]

What length 1/4 hose? I do not have a flowmeter, but have a pressure gauge plumbed to the output of my pump. I have verified the pumps 17gpm output by timed loader lift. At 17 gpm the pumps pressure is 500 psi to deliver that output dirctly back to sump thru the loader valve power beyond. When I use that PB output thru a remote feeding a 25' loop of 3/8 hose it takes a pretty high pressure for that flow. Its been a while but as I recall it took near 2kpsi. Thats 1500 for the 4 extra associated QCs and 25' hose + end fittings. I could do it again -- even splice in a 1/4" 6' hose between the two 3/8 pieces. It would have to be quick. The ID of 1/4 fittings is only 5/32. I would expect the crimp composite to be damaged by heat in less than a minute at 17gpm.
larry

 

[AKKAMAAN]

What length 1/4 hose? I do not have a flowmeter, but have a pressure gauge plumbed to the output of my pump. I have verified the pumps 17gpm output by timed loader lift. At 17 gpm the pumps pressure is 500 psi to deliver that output dirctly back to sump thru the loader valve power beyond. When I use that PB output thru a remote feeding a 25' loop of 3/8 hose it takes a pretty high pressure for that flow. Its been a while but as I recall it took near 2kpsi. Thats 1500 for the 4 extra associated QCs and 25' hose + end fittings. I could do it again -- even splice in a 1/4" 6' hose between the two 3/8 pieces. It would have to be quick. The ID of 1/4 fittings is only 5/32. I would expect the crimp composite to be damaged by heat in less than a minute at 17gpm.
larry

Wow...that would be great SPYDERLK!! Your numbers seems to back my estimate up pretty well!

My example was referring to a 10 ft piece of 1/4" hose. To make the test relevant, the gauge need to be T'd at the beginning of the 10ft 1/4" hose, and the other end (also with a straight crimp fitting) can go straight into the tank fill hole. That way we will measure the true DELTA P, over the hose.....GAUGE PRESSURE MINUS 0 psi (atmospheric pressure in the other end/tank). A good "ball park" estimate of the flow will be needed too.

To make the test show the impact of hose length, the test can be repeated with another 10ft 1/4" added to the first one, to a total of 20ft.

To make the test show the impact of increased size, the test can be repeated with a 10ft piece of 3/8" or 1/2" hose.

Very important that all three tests are done with the same flow (rpm). My example was calculated at 12.9 gpm.