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post #1 of (permalink) Old 11-11-2002, 01:15 PM Thread Starter
 
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Any conclusion? (Pipe Vs. tube)

Did we ever get to a solid conclusion in the Pipe Vs. Tube debate for cages?

I'm planning on building one and there are dozens of people in the local club who are using SCH 40 pipe. They have rolled, but I've never seen the results.

Would it make a difference if I told you I wanted to be relitively safe in a rollover at highway speeds? If you can call it safe.. Spending $1.60 a foot instead of $1.12 a foot isn't a big deal if it means it will actually hold up.

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post #2 of (permalink) Old 11-11-2002, 03:29 PM
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Re: Any conclusion? (Pipe Vs. tube)

Pipe is designed and certified to carry fluids and resist internal pressure.

DOM tube is designed and certified for structural applications, to carry tensile, beam and compression loads.

That should be all you need to know.
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post #3 of (permalink) Old 11-11-2002, 03:41 PM
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Re: Any conclusion? (Pipe Vs. tube)

A lot of people build cages out of pipe and survive another day. I have used it before for straight sections and bracing that survived thru a roll or two. For the main structure itmes I prefer .120 wall DOM or HREW, and a good design. I have seen pipe work better in some areas like rock sliders and fenders, the pipe seems to scratch on things, whereas the tube will gouge or dent from the same impact.
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post #4 of (permalink) Old 11-11-2002, 03:47 PM Thread Starter
 
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Re: Any conclusion? (Pipe Vs. tube)

Gouge Vs. Scratch...

Wouldn't that mean the tube has more flex and give and is less likely to fracture but more likely to bend a bit over pipe which would fracture, crack or shatter because it;s more brittle? Sharper, Stronger surface strength but more prone to clean breaks.. kind of like those expensive swiss knifes?
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post #5 of (permalink) Old 11-11-2002, 04:11 PM
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Re: Any conclusion? (Pipe Vs. tube)

From what I have read is that pipe is more brittle and can shatter with certain impacts(haven't witnessed it though) whereas DOM & HREW will absorb the impact. The few situations I have seen were on a rig with rock sliders that got gouged a few times, he switched to some sch. 40 ones and they haven't gouged, just scratched. From some other articles I have read on roll cages is that DOM & HREW are better structurally since they dissipate the energy from a roll better.
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post #6 of (permalink) Old 11-11-2002, 08:23 PM
 
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Re: Any conclusion? (Pipe Vs. tube)

I'm with pb... on this one.
Some say the only place for pipe is to use on your lower control arms because they bend less (stiffer/brittler).
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post #7 of (permalink) Old 11-12-2002, 01:23 AM
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Re: Any conclusion? (Pipe Vs. tube)

read any rule book for drag cars or racing...NO PIPE. I've even got a metal fab book that says pipe is for plumbing not racing [img]images/graemlins/blush.gif[/img], my dad swears up and down he can build a perfectly good cage out of sch.40 but I've seen cages like that and I think they look like sh!t, the bends look awful and I think pipe is a lot heavier then tube too. My bender is going to have 1-3/4" die for .120" wall TUBE.
post #8 of (permalink) Old 11-12-2002, 06:13 AM
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Re: Any conclusion? (Pipe Vs. tube)

Pipe is not ment to be bent. That is why they make so many pipe fittings. When you put a piece of plumbing pipe in a bender you really stress it. They are not designed for that kind of added Tensil stress. And the fittings a desinged with the idea of keeping the pipes from coming apart. Not holding them ridged. If you are going to build a cage that could someday save your life, don't risk it. Get the best marerial for the job.
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post #9 of (permalink) Old 11-12-2002, 06:29 AM
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Re: Any conclusion? (Pipe Vs. tube)

In the old days race cars were made out of pipe. We just finished restoring a late 60's or 70's asphalt modiefied car. Well most of it was pipe. The roof had been changed somewhere along the years and was replaced with tube. The racers then couldnt afford tube so they used pipe. Whats better??? Of course tube is, but there are more cages out there made of pipe then people will admit.
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post #10 of (permalink) Old 11-12-2002, 08:56 AM
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Re: Any conclusion? (Pipe Vs. tube)

How 'bout PVC? ---- Just kiddin, no, never!

But a friend recently bought a pretty CJ - had a nice full
cage - with thick padding. He paid a premium price for it
too, mainly because of the cage.

I was looking it over when he brought it home really proud.
I had my hands hanging on the cage as I was talking to him -
it moved a little!

Shook it - moved alot.

Turned out the entire cage was PVC covered in tape and
padding!

Please -- If you didn't build it or know for sure it's built
right, pull all the tape and foam off and inspect it carefully.

While you are still alive!



If whoever sold it reads this, stay out of dark alleys and
lonely places.
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