Pipe fitting

[bfullmer]

why don’t they make a fitting like this in galvanized a reducing street nipple ? Had to buy coupler and close nipple ??

 

[matthies]

Look at hydraulic fittings.

 

[Jim.ME]

Gates hydraulic catalog calls that an increasing bushing. A nipple would have male threads on both ends

What are you doing that requires galvanized? Plumbers would use a galvanized bell coupling and nipple of the appropriate size and length.

 

[bfullmer]

Gates hydraulic catalog calls that an increasing bushing. A nipple would have male threads on both ends

What are you doing that requires galvanized? Plumbers would use a galvanized bell coupling and nipple of the appropriate size and length.

View attachment 134524

On hyd equipment that stays outside

 

[Jim.ME]

On hyd equipment that stays outside

You should not be using galvanized plumbing fittings for hydraulics. Most plumbing fittings are only rated for 150 to 300 PSI working pressure and the galvanizing can flake off and cause problems. You should use fittings designed and rated for hydraulics. Your equipment, your choice.

 

[Fritz Maurer]

That's the general consensus, it's even printed on the pipe in some cases... I've got a 252 Oliver disc that had 1/2 " black pipe goober welded to the frame by the previous owner 50 years ago to control an 18 foot harrowgator...never had any trouble with it.

Ford 730 loader is equipped with 3/8 black pipe for much of the circuit.

 

[rustred]

why don’t they make a fitting like this in galvanized a reducing street nipple ? Had to buy coupler and close nipple ??

that sure is a small fitting, not sure what its used for ? but there is all kinds of hyd. fittings available. plus black pipe. what your showing is brass , no good.

 

[bfullmer]

that sure is a small fitting, not sure what its used for ? but there is all kinds of hyd. fittings available. plus black pipe. what your showing is brass , no good.

Actual steel hydraulic tubing seems thin how does it hold the pressure is it better steel ??

 

[Jim.ME]

Actual steel hydraulic tubing seems thin how does it hold the pressure is it better steel ??

There are differences in the material composition and the manufacturing processes.

 

[m16ty]

You should not be using galvanized plumbing fittings for hydraulics. Most plumbing fittings are only rated for 150 to 300 PSI working pressure and the galvanizing can flake off and cause problems. You should use fittings designed and rated for hydraulics. Your equipment, your choice.

I've also heard that the galvanizing can react with the oil and cause problems.

 

[m16ty]

That's the general consensus, it's even printed on the pipe in some cases... I've got a 252 Oliver disc that had 1/2 " black pipe goober welded to the frame by the previous owner 50 years ago to control an 18 foot harrowgator...never had any trouble with it.

Ford 730 loader is equipped with 3/8 black pipe for much of the circuit.

Yes, you see regular pipe fittings in hydraulic systems all the time, but I've also seen them bust before. Regular pipe fitting threads also often won't seal high pressure hydraulics. Hydraulic pipe threads are formed to different specs to hold the higher pressure.

 

[m16ty]

Actual steel hydraulic tubing seems thin how does it hold the pressure is it better steel ??

The main thing is hydraulic steel tubing is alloy steel, where regular pipe fittings are cast.

 

[Fixingfarmer]

Use what you have in the picture or go find a stainless version. Galvanized pipe should not be used

 

[rustred]

We have no idea what hyd equipment he is even talking about nor pressure , yet all kinds of answers. 500 lbs vs 5000 lbs. ???

 

[DanielW]

I'd tend to agree with those that say get a proper hydraulic fitting, and especially avoid galvanized. Regular sched pipe is sometimes used in ag hydraulic systems. It really shouldn't be, because 95% of hydraulics will have relief pressure of several hundred to several thousand psi. But folks still use it sometimes, and mostly without issue. As noted above, it's plenty thick and probably a similar alloy. It's not that sched pipe can't handle the pressure - it's rather that it just isn't tested/QA-checked for those pressures. Similarly, you can buy round structural tube that's exactly the same as sched pipe in every way - it just hasn't been pressure rated/tested with the same QA. If you were to use it in plumbing instead of sched-rated pipe, it'd do fine in 99% of cases. But you may get the occasional weld defect on the seam, etc, because QA and testing procedures aren't the same. I've used regular sched fittings for hydraulics myself several times. But most importantly: If you are going to use regular sched pipe/fittings, you want black pipe - not galvanized. The galvanizing can flake off - especially from internal threads and elbow fittings.

When I bought my Allis 180, one of the remote pairs wasn't working properly. The loader the previous owner had on it had several home-brewed galvanized pipe lengths and fittings (I left the loader for him to scrap, because it was a cobbled-together mess). When I took the coupler apart on the bad remote, I found a pile of galvanizing flakes jammed in it. Cleaned it up and it works now, but I'm sure those flakes floating around the hydraulic system didn't do it any favours.

Similarly at work we often used to (and still do... for some reason...) use galvanized sched 40 for running a lot of pneumatic lines. Twice in the past few years we've had to make warranty trips to customer's sites to repair/replace pneumatic solenoid valves and cylinders that have had galvanizing flake off and bungle them up inside. The galvanized elbows seem to be the worst offenders.

Even if this is a low-pressure system, the proper hydraulic reducing bushings are only a couple dollars. Better to just do the thing properly in the first place. But if you are going to use regular sched fittings from the hardware store, better to use black instead of galvanized. See link below for an example: For less than $2 you could get the proper hydraulic bushing:

https://www.new-line.com/fittings/npt-jic-hydraulic-adapters/jic-orb-and-npt-hydraulic-adapters/mnpt-x-fnpt-bushing

 

[bfullmer]

I'd tend to agree with those that say get a proper hydraulic fitting, and especially avoid galvanized. Regular sched pipe is sometimes used in ag hydraulic systems. It really shouldn't be, because 95% of hydraulics will have relief pressure of several hundred to several thousand psi. But folks still use it sometimes, and mostly without issue. As noted above, it's plenty thick and probably a similar alloy. It's not that sched pipe can't handle the pressure - it's rather that it just isn't tested/QA-checked for those pressures. Similarly, you can buy round structural tube that's exactly the same as sched pipe in every way - it just hasn't been pressure rated/tested with the same QA. If you were to use it in plumbing instead of sched-rated pipe, it'd do fine in 99% of cases. But you may get the occasional weld defect on the seam, etc, because QA and testing procedures aren't the same. I've used regular sched fittings for hydraulics myself several times. But most importantly: If you are going to use regular sched pipe/fittings, you want black pipe - not galvanized. The galvanizing can flake off - especially from internal threads and elbow fittings.

When I bought my Allis 180, one of the remote pairs wasn't working properly. The loader the previous owner had on it had several home-brewed galvanized pipe lengths and fittings (I left the loader for him to scrap, because it was a cobbled-together mess). When I took the coupler apart on the bad remote, I found a pile of galvanizing flakes jammed in it. Cleaned it up and it works now, but I'm sure those flakes floating around the hydraulic system didn't do it any favours.

Similarly at work we often used to (and still do... for some reason...) use galvanized sched 40 for running a lot of pneumatic lines. Twice in the past few years we've had to make warranty trips to customer's sites to repair/replace pneumatic solenoid valves and cylinders that have had galvanizing flake off and bungle them up inside. The galvanized elbows seem to be the worst offenders.

Even if this is a low-pressure system, the proper hydraulic reducing bushings are only a couple dollars. Better to just do the thing properly in the first place. But if you are going to use regular sched fittings from the hardware store, better to use black instead of galvanized. See link below for an example: For less than $2 you could get the proper hydraulic bushing:

https://www.new-line.com/fittings/npt-jic-hydraulic-adapters/jic-orb-and-npt-hydraulic-adapters/mnpt-x-fnpt-bushing

This thread kind of got off track I was wondering why they make a street “L “ but not a street coupling in pipe fittings

 

[rustred]

If u mean street 90 degree elbow , yes.

 

[Fritz Maurer]

This thread kind of got off track I was wondering why they make a street “L “ but not a street coupling in pipe fittings

I would venture to guess that because of the number of straight street combinations possible, that the inventory of individual pieces is more likely to move as opposed to special pre-made, seldom used fittings.

 

[m16ty]

We have no idea what hyd equipment he is even talking about nor pressure , yet all kinds of answers. 500 lbs vs 5000 lbs. ???

I know of no hydraulic system that operates as low as 500 lbs. Even if it did, that’s still beyond the pressure rating of regular pipe fittings. Most are rated at 250 psi max, you will sometimes see them rated as high as 300 psi.

 

[rustred]

If u mean street 90 degree elbow ,

I know of no hydraulic system that operates as low as 500 lbs. Even if it did, that’s still beyond the pressure rating of regular pipe fittings. Most are rated at 250 psi max, you will sometimes see them rated as high as 300 psi.

neither do i, i am giving an example , wondering why the OP dont tell us what he is working on is more fitting here. it all depends on the pipe schedule for psi ratings. 40,80,160 example. which is the wall thickness of the pipe. perfectly fine for hydraulics. ok never mind the 500 psi , go 1000 psi on old tractors then, picky picky. who was talking regular pipe anyhow , not me. maybe he has the relief valve set at 500 psi, who knows whats going on here, yet all kinds of off the street info is thrown in the soup pot.