From the NHRA website:
...The rollbar must be constructed of minimum 1 ｾ inch o.d. x .118 inch wall mild steel tubing
, or 1 ｾ x .083 chrome moly tubing
, and must conform to the following diagram:...
It's probably best to say generally pipe is rated for internal carrying temperature and pressure where as tubing is for structural construction.
it actualy means "TUBULAR" shape..not square or rectangular...etc...which INCLUDES pipe
dimensions because pipe is a tubular shape
So i didn't start another arguement for those who know nothing of what they talk about but just read alot of internet myths and opinions..i went right to the source
and emailed a question to the NHRA website Tech
Emailed this at noon today while i am on lunch hour in my office at work to email@example.com
word for word....
Can anyone use pipe for the roll cage as long as it is pipe..like say 1 1/2" pipe which has an outside measurement of well over 1 5/8"?
There seems to be the on-going arguements all over the place about the same exact material and manufacturing process of pipe vs tubing and the only actual difference is the way it is made for measuring purposes..pipe being inside diameter measurements and tube being outside measurements.
I was wondering this because i have access to a lot of Chromoly and DOM piping much cheaper than it would be to go out and buy Tubing,i am an International Ironworker by trade/career and can get the pipe on discounts through my company i work for and i have hands on and training experience in the actual difference in the piping and tubing.
I know the rule book says"tubular"..but pipe technicly falls under the tubular category since it is round and not square or rectangular
Here is his answer emailed back at 12:55 EST......
It makes no difference as long as it meets our minimum requirements of 1 5/8 O.D. and .118 wall thickness for mild steel, .083 for cm.
Pacific Division Technical Director
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I meant no insults by saying people don't know anything of what they speak of..its just the nature of the internet to "assume" because someone said something in a forum.
I am just an Un-bias opinionated person through and through 100% and laugh so many times when i see internet warriors make other people beleive they are "masters" at what they TRY to talk about and mis-lead info to those who don't know,but yet i DO have personal hands on expereince in this arena since i have been ironworker since 1978 and have worked in structural,ornamental,piping and countless other fab shops as a fitter..welder..rigger...hangin iron on actual structural buildings where PIPE is commonly used to for "structural" purposes...etc and etc.
So i laugh so HARD when people on the internet claim "pipe is WEAK" when the true facts and "common sense" tells you the same exact type of material and prosesses are used but one is made for inside measurements and the other is outside measurements.
And a lil info for those saying HREW is NO GOOD..DOM starts out as HREW..then drawn over a mandrel to flatten the welded seam out for a more consistant strength area.
ALL of it starts as the same exact materials as a Plate..then rolled into a tubular shape and welded..but others continue more processes for a different usage in different purpoes..and PIPE is made the same exact way as Tube is made...common sense.......................