Hyd hose diameter

[kennyd]

Smaller hoses are fine between the valve and the cylinder since they are not continuously flowing fluid. They can also help keep the cylinder speed slower for better control. 1/4" hoses for example work great on TnT setups.

What is this cylinder controlling, and what size is the pump?

 

[jake98]

Under pump capacity in the manual it says:
Max. flow rate 12.9/ 1st: 8.3, 2nd: 4.5
So I guess that means two pumps?

I'm going to chain the cylinder between stumps and see if I can pull some out.

 

[Chilly807]

The larger number is the main pump for general hydraulics, usually the smaller number is devoted to power steering only.

Sean

 

[kennyd]

1/4" hose sounds perfect for your project: It's cheaper, lighter, easier to store.

 

[AKKAMAAN]

AKKAMAAN,

Is there a large difference between say a 1/4 in hose, 3/8 in hose and a 1/2 in hose to extend a cylinder?

Are we talking about time and heat?

Time basically the same as long as PRV is closed, heat differs, engine labor too

 

[J_J]

Time basically the same as long as PRV is closed, heat differs, engine labor too

The original post by jake98 wanted to know if the size and length of the hose made a significance difference. So, your answer is no, is that right. I think the reason he was asking is because of cost. However I haven't seen a lot of 4 in cyl use 1/4 hose.

 

[AKKAMAAN]

The original post by jake98 wanted to know if the size and length of the hose made a significance difference. So, your answer is no, is that right. I think the reason he was asking is because of cost. However I haven't seen a lot of 4 in cyl use 1/4 hose.

jake98 did NOT use "significance" in his post, that is your own interpretation...:laughing:
OP asked

if it makes a difference..

...and I try to explain the difference....

Obviously it depends on what values one put in the phrase "significance difference". Some posters seems to think any hydraulic design is OK as long as PRV is closed during operation....:confused2:

Choosing the "right" size hose, is most of the time a negotiation between the investment budget and the operation cost (fuel) budget. Especially when an up size force you to choose 4 wire instead of 2 wire due to pressure rating. 1/4" is cheap, and many times you can get away with 1 wire hose (up to 2750psi)

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...

power loss??
12x250/1714=1.75hp
12x500/1714=3.5hp


We are talking heat power like a furnace....

A 1/2" has 4 times larger cross section area than 1/4".

if it makes a difference..???

Does it?

 

[J_J]

Your numbers are probably right, but like you said, if the HP is there,and there is sufficient cooling of the fluid, then what. It comes down to expense. I would also like to see the test, using different hoses, pressure and volumes. I had thought you had the hyd simulation software that you could plug in the components. I appreciate your knowledge and assistance in helping us all, understanding hydraulics.

 

[glastron23]

Hi guy's AKKAMAAN we have some 55 foot bucket trucks that had a similar problem, we were experiencing very high return back pressures at the bucket (450 to 600 psi) that was interfering with same of the hand held hydraulic tools they using, the trucks were using 5 gpm OC pumps with throttle advance for 7 gpm. From the pump through the boom to the bucket controls and then back to tank we had about 165 feet of #8, 518c plastic hose ( if you want a light,some what of a tight radius,corrosion proof,cheap hose check it out) . the pressure and return were both #8, to resolve the high back pressure we had to install a second #8 return line from the bucket controls to the tank. this dropped the back pressures to 225/275 psi. as far as the flow, rates the were the same in both. Jim

 

[AKKAMAAN]

Your numbers are probably right, but like you said, if the HP is there,and there is sufficient cooling of the fluid, then what. It comes down to expense. I would also like to see the test, using different hoses, pressure and volumes. I had thought you had the hyd simulation software that you could plug in the components. I appreciate your knowledge and assistance in helping us all, understanding hydraulics.

Thx J_J!
I have been looking into HYD SIM SOFTWARE, but they are still not the "real" thing....
I used to have a "sorta complete" education lab at the school I worked for till year of 2000........

I know there are some online calculators for pressure drop, but they will always be questioned too....and I don't trust them when I can't track the formula programming....this Gates pressure drop calculator shows this result for a 1/4" 10ft hose...see the jump in numbers compared to 3/8" and 3/16"

AutomationStudio is the ultimate simulation software, but so expensive...