There is a difference between pipe and tube. Pipe is usually sold as a "SCHedule" 20, 40, 80, or 120 wall. The higher the number, the thicker the pipe wall thickness. It is also measured differently than tubing. A 2" sch40 pipe will be just over 2 5/16ths" OUTSIDE diameter with a wall thickness of approx .188". A 2" sch80 pipe will be the same Outside diameter, but the inside diameter will be smaller due to the thicker wall. 2" sch80 would be closer to .250 or even .313 thick wall.

HREW Tubing is usually sold as outer dimension X wall thickness. Example being a 2" O.D. tube with a .250" wall. In the case of square tube, dimension X dimension X wall thickness.

The main difference between the two is that the SCH pipe is pressure tested to a certain pressure, which is why it is used in high pressure lines. Pipe is also usually more expensive due to the testing. But not necessarily stronger.

Some people are recommending DOM, which is the same as tube, but formed differently. HREW Tube is bent into a round shape, then welded. You can easily see a seam in it. DOM is formed by pushing steel through a mandrell, giving tighter tolerance in the size, and a seamless tube that is much stronger (and much more expensive then pipe and HREW tube). Way overkill for sliders.

DOM is used primarily is race applications like roll cages where strength is an issue. Chromoly is a stronger and much more expensive version.

You are building rock sliders. Nothing structural like a frame or a cage. Pipe or HREW tube will work very well, with strength being determined by the diameter and wall thickness. Depending on how hardcore you will pound on it is also a factor. I have sliders that are made of 2x2square x.125" wall HREW tube that I can jack the truck up with. If I came down hard on them, they would likely dent easily. Hasn't happened yet. The welds on the frame would likely break before they would bend though.

You have to choose what you want to use, but both pipe and HREW will work extremely well for your application, as long as your welds are good enough, and you use heavy enough wall thickness for your application.

 

i made my sliders out of pipe from my pop's shop and they've been hit on the trail 5 times. and we picked my truck up with a set of fork lifts at the shop too on just the sliders...so i don't know why pipe wouldn't be ok for sliders because it has worked well for me.

 

You have this backwards - TUBING is used at high pressure. PIPE is rarely under pressure. Pipe is ALWAYS cheaper than tubing of the same "weight".

Metallurgically, the structure of pipe is vastly inferior to tubing. Even HREW is better metallurgically than pipe, and DOM is even better. Cromoly tubing is an alloy steel that is significantly stronger than the "regular" steel. It is almost always DOM also, so you are getting the best of the best.

 

Considering we are generally talking carbon steel here, please clarify your statement.

ASME B31.1, B31.3, VIII Div 1 & 2

For structural purposes like sliders and cages, tubing is far superior and pipe is for poop.

 

i dont know what you guys are talking about, im going to make sliders out of pvc pipe

hahaha,

 

You said it best - "pipe is for poop". For hydraulics and anything under significant pressure, tubing is used (and frequently DOM at that).

 

Your previous statement that I quoted is still misleading at best.

For example, 2" Sch XXS Pipe SA-106B at 40% yield has a working pressure over 5000 PSI.

Use a higher grade CS with a higher Yield Strength and you almost quadruple that allowable working presure.

And if you get into alloy material piping you can really get pressurized.

Application is everything.

 

???? thats a really weird test, they just tested pieces of metal from pipe and tube, not actual pipe or tube??? .

 

Aside from the differing strength issues, the physical dimensions are a factor for tooling. If you plan on using mandrel bending to form the tube/pipe, mandrels for tube benders are offered in terms of outer diameter, thus a 1.75" die for 1.75" tube. You can get a pipe bender but it is not a mandrel bend, so you may see some distortion in the bent pipe.

For sliders, pipe is probably fine, as long as weight is not a big issue. Tube will be stronger, pound for pound, than pipe, so for a given weight a tube slider would be stronger than a pipe slider. For something more related to occupant safety like a roll cage, tubing would be a much better choice. And for say a full tubular chassis, you would never see pipe being used, since it is both heavier and weaker.

 

... and tubing of the same diameter and wall thickness will be higher yet. Sorry, don't have a copy of the boiler code around so can't quote the exact numbers.

The analogy is that pipe is like a cast part and tubing (even seamed) is like a forged part. Which would you rather have if your life was depending on it?

 

Seriously, you need to read my responses. You danced all around the initial issue which I will quote again.

This is a false statement. Period.

Tubing and pipe do not come in the same diameter and for a few exceptions wall thicknesses, thus pipe and tubing both have their specific applications as pressure retaining components, i.e. heat exchangers.

I agree that for rockcrawling and building sliders and cages, tubing is by far superior, but that was not the issue quoted.

 

once again nothing is wrong with pipe. i used it on my sliders and i'm using it to make my bumpers now. one of my buddies owns a fab shop (tellico tubes) he uses tubing but i checked things with him and if you use a thick enough pipe... its just as good as tubing. so use a thicker pipe to equal tubing. the only difference is the weight.

 

Here is a good thread about pipe vs tube

http://www.pirate4x4.com/forum/showt...ight=poop+pipe

 

another disadvantage of pipe no one mentioned is the black coating which sucks to take off and u def want to do this befor welding or painting it

 

You meant to say Black Iron Pipe which is actually A53 grade B mild steel.


The question posed should not be Piping vs Tubing. The question should be what base materials and wall thickness are you compairing. Provided they are the same, the end result will be the same.


You go bending an A513 3/4" schedule 40 pipe:
Outside Diameter 1.05"
Inside Diameter 0.82"
Wall Thickness 0.13"

Then bending an A513 1" 10-gauge tubing
Outside Diameter 1.000"
Inside Diameter 0.866"
Wall Thickness 0.134"


Same thing is going to happen. You go buying unknown materials at and compairing different overall sizes. Apples and oranges.