hydraulic hose size

[rasorbackq]

What decides hydraulic hose size . I want to get a single arm pallet grapple and need to run hoses from bucket area to rear remotes . Also my tractor has looks like steel lines that run down the loader arms for loader operation. I have a lot of SS 3/8 rolls of new line ( was going to be used as air line s many years ago.)
. Can I use that ??

 

[oldnslo]

Required Hose size is determined by several factors some of which are:
Desired flow rate
usage - momentary or continuous
bend radius
pressure rating

What is the pressure rating on your 3/8 SS? Doubt it will be adequate for hydraulic pressure.

 

[mcfarmall]

Run lines the same as the nominal port size on the cylinder you wish to use. 1/2" NPT ports use 1/2" ID hose or 1/2" OD steel tubing rated for the system pressure.

 

[MtnViewRanch]

Run lines the same as the nominal port size on the cylinder you wish to use. 1/2" NPT ports use 1/2" ID hose or 1/2" OD steel tubing rated for the system pressure.

While this might be considered a safe way to plumb, (as in you can't go wrong by doing this) There are 2 1/2" dia cylinders with 1/2" ports as well as 3", 3 1/2" & 4" dia cylinders all with 1/2" ports. They do not all require the flow that a 1/2" line provides. In fact even my 4" cylinders on my rear blade are fed with 3/8" hose.

For the OP, I would recommend that you use 3/8" hose. As far as your SS line, I sort of doubt that it is properly rated for high pressure hydraulic systems. Not saying that it is not, but without being 100% sure that it has the proper rating, I would not use it. :no:

 

[Leejohn]

I used 1/4" and the speed is just right. I am not going to be running a hyd motor or anything that needs a lot of flow.

 

[rasorbackq]

The steel coils I have are
BLT -6
Product code 503-011
3/8 x 25'
Best I could find.

BLT - Steel Brake Line SAE 527 Tube

This is used for hydraulic brake systems (rated SAE 527) and is typically cut into short brake line assemblies (typically 8", 12", 20", 30", 40", 51", 60"). It is also available with a green anti-corrosion poly coating which complies to GM123M-ASV and SAE J527B requirements (part # BLT-xGRNX25).

Typical Fittings: Inverted Flare fittings and 181- Threaded Sleeve Tube Fittings.

Construction: Flexible steel tube.

Can I use this ?? for some of the way from front to back?

 

[bcp]

From:

Full text of "SAE J527: Brazed Double Wall Low Carbon Steel Tubing"

...
BRAZED DOUBLE WALL LOW
CARBON STEEL TUBING SAE J527a

Scope This standard covers brazed double wall low carbon steel
tubing intended for general automotive applications and other similar
uses.
...
Pressure Proof Test Unless otherwise specified, the finished
tubing shall withstand a hydrostatic proof test, with no evidence of
failure, at a pressure which will subject the material to a yield stress
of 20,000 psi. Test pressures shall be as determined by Barlow's
formula for thin hollow cylinders under tension:

D where: D = outside diameter of tubing, in.

P = hydrostatic pressure, psi

S = allowable unit stress of material = 20,000 psi

T =r minimum wall thickness of tubing, in.

No tube shall be tested beyond a hydrostatic pressure of 5000 psi.
unless so specified.

=================================================

I wonder if this is the same standard for tractor hydraulic tubing. Doesn't some equipment use pressures near 5000 psi?


Bruce

 

[BrokenTrack]

One mistake I see a lot of people make regarding hoses is swapping out steel lines for rubber hoses. I know why they do so, heck I have done it, but those steel lines help cool the hydraulic system too. Rubber contains the heat.

In this case it has no bearing, but I post it for further thought. When replacing steel hydraulic lines, it should be replaced with them, NOT hydraulic hoses.

 

[rasorbackq]

One mistake I see a lot of people make regarding hoses is swapping out steel lines for rubber hoses. I know why they do so, heck I have done it, but those steel lines help cool the hydraulic system too. Rubber contains the heat.

In this case it has no bearing, but I post it for further thought. When replacing steel hydraulic lines, it should be replaced with them, NOT hydraulic hoses.

Good point I never thought about a steel line cooling the fluid.