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post #1 of (permalink) Old 02-18-2005, 12:58 AM Thread Starter
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hrew safe??

I was down at the racecar shop near me looking for Dom tubing. The mechanic who builds their chassis told me that they use all hrew tube in for their chasis. Just wondering if it is tough enough to obsorb the crashes they are involved in would it work in a Jeep? I was thinking 120 wall. He did say that you had to plan your bends carefully around the seam.
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post #2 of (permalink) Old 02-18-2005, 07:14 AM
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Re: hrew safe??

if your only planning low speed offroad rolls then it should be fine.....if your thinking highway speed rolls then i'd go DOM, I'd be worried about the seam splitting in a hard rolls and someone getting hurt because the cage bent too much

if its a trailer queen then its all good
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post #3 of (permalink) Old 02-18-2005, 08:36 AM
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Re: hrew safe??

[ QUOTE ]
if its a trailer queen then its all good

[/ QUOTE ]

If it's a trailer queen then why not save some money and go with Sched 40 ABS...would cut out the need for a bender...just grab some fittings at your local plumbing supply...and it's much lighter than any metal pipe... [img]images/graemlins/grin.gif[/img]
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post #4 of (permalink) Old 02-18-2005, 12:08 PM
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Re: hrew safe??

somebody dig up the old "poop pipe" thread...
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post #5 of (permalink) Old 02-18-2005, 12:11 PM
 
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Re: hrew safe??

nooooooo...... not this thread again.
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post #6 of (permalink) Old 02-18-2005, 12:23 PM
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Re: hrew safe??

before someone starts ranting......

HREW is a tube...so it has tube dimensions, but is seam welded like pipe.
these are OK for a cage IF
1)you use the correct grade structural steel (not cheapy stuff)
2)you are not having a hgih speed roll situation like racing

IF both of these are not met, THEN you will have problems, and should use DOM tubing.

soo...no digging up old posts, i think Jeff knows not to use old cast sewer pipes as a roll cage.
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post #7 of (permalink) Old 02-18-2005, 12:59 PM Thread Starter
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Re: hrew safe??

[ QUOTE ]
you are not having a hgih speed roll situation like racing

[/ QUOTE ]

So then how is it that the race shop who has to pas inspection on their cars and build them to the standars of the sanctioning body use it??
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post #8 of (permalink) Old 02-18-2005, 01:07 PM
 
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Re: hrew safe??

Doesn't dom start out as ew? Only seamless, is seemless.
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post #9 of (permalink) Old 02-18-2005, 01:31 PM
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Re: hrew safe??

[ QUOTE ]
[ QUOTE ]
you are not having a hgih speed roll situation like racing

[/ QUOTE ]

So then how is it that the race shop who has to pas inspection on their cars and build them to the standars of the sanctioning body use it??

[/ QUOTE ]

The answer is simple. The race cars often build internal cages and frames that are engineered to sustain the forces required to keep the driver as safe as possible at those speeds.

Jeeps are much heavier and can roll at 70MPH on a freeway, or 4MPH on the side of a 40* hill. Now sit down and engineer a cage/frame that will sustain the forces necessary to keep you and your passengers safe in both conditions. I think you'll find that DOM will be a heck of a lot safer.

So, what ever you use, you're betting your life on...

For my life, and that of my family... I'll take DOM and never look back.
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post #10 of (permalink) Old 02-18-2005, 01:32 PM
 
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Re: hrew safe??

Ok, I went to the SCCA website and viewed the pdf of the 2005 rules. I can't post a page, as its an 11mb pdf file SCCA Page to download the rules . See GCR Section 18. They allow chromoly, dom, seamless and ERW tubing for cages. They specify minimum diameters and wall thicknesses for each material. For ERW it is a minimum of 120 wall thickness and they specify various diameters and wall thicknesses up to 180 wall depending on the weight of the car (some over 4000 lbs). I would think if its good enough for race cars, it would be good enough for a jeep. It seems to me you need to pick the right diameter and thickness of ERW for the job.
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