Posted by hydraulic lines on March 05, 2008 at 21:16:16 from (68.149.51.25):
In Reply to: Re: Steel Hyd. lines posted by Bruce Hopf on March 05, 2008 at 20:24:44:
JIC are flare fittings that are used on hydraulics. They don't need to be reefed super tight and don't need any tape or sealant. O-Ring fittings are also used. JIC and O-ring fittings have straight thread. NPT pipe thread is tapered. Galvanizing can flake off and ruin hydraulic components. There is no comparison to gas lines for your house and hydraulic lines. Hydraulic tubing is smaller to take up less space and is about the highest quality tubing you can buy. Hydraulic tubing is also sized to prevent turbulance from different size fittings which will cause excess heat which you don't want. Water pipe isn't seamless. For a low pressure system like on a tractor (2500 psi), water pipe can work. Hydraulic tubing can be bent to go around corners and fit exactly. Water pipe needs a bunch of fittings and can't come close to being tucked in as nice. More fittings equals more potential for leaks and heat. I've never seen large expensive machines use regular pipe for hydraulic lines. I would think the manufactures would want to use the best lines they could.
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