DOM vs. HREW

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12-12-2002, 12:33 PM
Cajun

Here's one...http://www.pirate4x4.com/forum/showt...ghlight=fatkid

The above one has a nice overall look, but I prefer the asthetics of the "halo" front, like this...http://thisdysfunctional.org/kids/album26/DSC00142.jpg
02-10-2009, 12:33 PM
KrazyKarl02

Quote:

Originally Posted by redcagepatrol

it's NOT being cheap, it't having a brain and being smart about it. The way you are talking, you would be stupid for using DOM and not true tig welded chrome-moly tubing.

You don't have to have 40 spline axleshafts on a 2000lb rig. There is a reason God made brains. Overkill is not the answer.

Not to be singleing Scott out, but I noticed in the recent tube buy thread that Scott requested DOM.

Scott have you changed your position on the strength of HREW? Why the switch to DOM?
02-10-2009, 03:09 PM
BMFScout

Quote:

Originally Posted by KrazyKarl02

Not to be singleing Scott out, but I noticed in the recent tube buy thread that Scott requested DOM.

Scott have you changed your position on the strength of HREW? Why the switch to DOM?

Scott has money now! :)
02-10-2009, 03:38 PM
Lynda

Quote:

Originally Posted by KrazyKarl02

Not to be singleing Scott out, but I noticed in the recent tube buy thread that Scott requested DOM.

Scott have you changed your position on the strength of HREW? Why the switch to DOM?

Because he loves me and his son and wants us to be safer than safe :)
02-10-2009, 03:46 PM
davido

....so is that to say that HREW is unsafe?
02-10-2009, 03:48 PM
redcagepatrol

Quote:

Originally Posted by KrazyKarl02

Not to be singleing Scott out, but I noticed in the recent tube buy thread that Scott requested DOM.

Scott have you changed your position on the strength of HREW? Why the switch to DOM?

I have not changed my position. I built Lynda's cage with DOM and learned the HUGE differnce between the two while pulling the handle on the bender... Her rig is heavy, mine is light.

I roller her rig HARD with ZERO distortion in the cage - that stuff isn't even thinking about bending unless going at high speeds (which we don't do)

I've bent (from rocks, rolling, or a crane...) several pieces of tube on the Patrol but long story short - it is adaquate to protect you in a roll - even in a significant roll. It might distort and require a new cage, BUT - it will protect you.

While offroading - I purposfully stay away from situations that could result in "significant" roll down a hill - I just pull the winch. It's just not worth the risk. I have no problems with laying the rig on it's side or even a slow roll on the lid - not a big deal.

Three reasons the "new" tube on the Patrol will be DOM
1) I have more money
2) I'm using it for the frame
3) I might make new sliders (mine are bent) and the DOM holds up better to the beating on the rocks.

SO - HREW is fine as long as the cage design, welds, and tube fits are done properly. DOM is better but not needed in most applications (low speed)
02-10-2009, 03:56 PM
uglyota

does .120 wall HREW actually measure .120? .120 DOM definitely looks thicker than .120 HREW, and pulling the handle on the bender is waaaaay harder. Maybe it has something to do with the ratings...like DOM is at least .120 and HREW is closer to actually .120?
02-10-2009, 03:58 PM
robertf03

what?
02-10-2009, 04:29 PM
uglyota

Disregarding that they are both called .120 wall, is .120 wall DOM is thicker than .120 wall HREW?
02-10-2009, 04:44 PM
robertf03

no, they are both .120

keep in mind tubing is used for more than just cages and indexed off the ID or OD so if its not consistant with the size its junk
02-10-2009, 05:11 PM
uglyota

so two pieces of tubing, both 1.75" OD, both .120" wall, both mild steel, one HREW and one DOM and somehow the DOM is thicker and heavier. Guess the welded seam saves weight? :)
02-11-2009, 08:44 AM
Lynda

Quote:

Originally Posted by davido

....so is that to say that HREW is unsafe?

No, HREW is safe...but DOM is safer :D
02-11-2009, 10:30 AM
KrazyKarl02

Quote:

Originally Posted by uglyota

so two pieces of tubing, both 1.75" OD, both .120" wall, both mild steel, one HREW and one DOM and somehow the DOM is thicker and heavier. Guess the welded seam saves weight? :)

In my opinion, Everyone thinks the seemless or DOM process has better wall control, it doesn't. DOM, Drawn over mandrel is made by extruding a billet of steel over a piercing point. It is very hard to maintain a constant wall thickness via this method. On the other hand HREW is made by rolling a strip of metal into a tube.

With HREW you can start off with 0.120 thick plate and roll it and have very consistent wall. With DOM a manufacturer will intentionally "roll heavy" or have a thicker wall to insure that it is atleast .120 all around, so one side might be .130 while the other is .120 I think that is why DOM is heavier.

The other difference is how much you trust the weld process that links the HREW together. I could see where that might have some internal stress built into it.

Just my 2 cents.
02-11-2009, 10:41 AM
jerryg79

jones is that you?
02-11-2009, 10:55 AM
KrazyKarl02

Quote:

Originally Posted by jerryg79

jones is that you?

No it was authentic Karl sharing his pipe knowledge with the the world. I like to try to contribute some technical related comments to this board every now and again. You might try it sometime..... :flipoff2:
02-11-2009, 10:59 AM
jerryg79

ok but let me send you an email making fun of jones for stating the same thing first:flipoff2:
02-11-2009, 11:02 AM
FJAggie07

Quote:

Originally Posted by KrazyKarl02

No it was authentic Karl sharing his pipe knowledge with the the world...

I got that far and didn't want to read the rest. :rainbow: :flipoff2:
02-11-2009, 11:09 AM
uglyota

Holey fawkiin shiat! Real tech! Thanks!
02-11-2009, 11:23 AM
Doug Krebs

I've always have read on the internet, that DOM starts life off as HREW and then has the drawn over mandrel pipe.

Karl however works in this industry and knows how to lay pipe!
02-11-2009, 11:42 AM
robertf03

karl are you confusing seamless and DOM? I've ordered both dom and seamless pipe and there were big price differences, but that was stainless and a long time ago. It was some indian mfg if you want to check the pipe network
02-11-2009, 12:11 PM
uglyota

Don't they sometimes call DOM "seamless"? Though it seems like I have heard of both DOM seamless and extruded seamless
02-11-2009, 01:02 PM
73bronco

I'm pretty sure DOM is just HREW thats went through a mandrel afterwards which cold rolls it making it stronger
02-11-2009, 02:10 PM
eight

I believe DOM is welded tube that has had a mandrel pulled though it. Karl is referring to seamless tube. There is an argument in the tube industry over which is stronger. It is generally accepted that seamless is stronger but but can be argued the other way. The seamless people say the welds on welded tube are a weak point. The welded people say the welded tube is stronger because of more consistent wall thickness as Karl explained above. The good stuff will not show a seam anyway. We keep both in stock at work. I use the welded unless specified otherwise. If either was crap we would have blown it up by now.
02-11-2009, 03:21 PM
KrazyKarl02

I take back my previous statement, DOM is HREW that is drawn through a mandrel. This thereby makes my theory of why DOM would be heavier a flaming pile of ****.....

I see no reason why DOM should weigh more than HREW.
02-11-2009, 03:40 PM
redcagepatrol

DOM should not weigh more, but I promise, it is significantly stronger. A big enough difference that you can tell real quick what you are pulling on in a bender.
02-11-2009, 03:47 PM
J Cooper

why dont we all just use square tube for our cages and frames like the square drive shaft kids?
02-11-2009, 04:12 PM
jerryg79

Quote:

Originally Posted by J Cooper

why dont we all just use square tube for our cages and frames like the square drive shaft kids?

too many right angles messes up the fung shui!
02-11-2009, 05:52 PM
uglyota

You die! You die and go to hell!
02-11-2009, 06:23 PM
CheapJeep

I used both chromoly and dom for my new cage and other tubework. The chromoly is a little stronger and lighter with .095" wall thickness compared to the .120 dom. Regardless they're both strong, the main gain is in weight saving.
02-11-2009, 07:56 PM
redcagepatrol

Quote:

Originally Posted by CheapJeep

I used both chromoly and dom for my new cage and other tubework. The chromoly is a little stronger and lighter with .095" wall thickness compared to the .120 dom. Regardless they're both strong, the main gain is in weight saving.

Yeah - you used chromoly DOM and regular DOM... This discussion has never even thought about getting into the chrmo stuff... - that's way up there...:)
02-11-2009, 08:23 PM
Seth

Ed Zachary - Cromo is for long haired pretty boys who....er wait. :flipoff2:

I was thinking about square tube cages the other day when I was looking at all the ROPS's on tractors. Then you could pin it and make it removeable!
02-11-2009, 08:32 PM
Sharpe

Quote:

Originally Posted by KrazyKarl02

No it was authentic Karl sharing his pipe knowledge with the the world. I like to try to contribute some technical related comments to this board every now and again. You might try it sometime..... :flipoff2:

But you do it just infrequently enough that we are genuinely suprised every time :flipoff2:

Quote:

Originally Posted by J Cooper

why dont we all just use square tube for our cages and frames like the square drive shaft kids?

Eat a bowl of dicks.
02-11-2009, 08:49 PM
Graystroke

Quote:

Originally Posted by 73bronco

I'm pretty sure DOM is just HREW thats went through a mandrel afterwards which cold rolls it making it stronger

soungs good and probably makes the seam disapear and fuse it together more.
02-12-2009, 11:03 PM
Graystroke

Quote:

Originally Posted by J Cooper

why dont we all just use square tube for our cages and frames like the square drive shaft kids?

i figured this can go here. is that square tube?
http://www.fourwheeler.com/eventcove.../photo_01.html

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