What is the difference between followings?

paresh_career001 Its a Wide subject and it will be injustice with the subject if someone try to reply in few words, I think best option for this kind of question is just type word with the question mark on google and you can get an answer close to perfection.

For example type "tube?" ON google and you can find link------

http://en.wikipedia.org/wiki/Tube

I will like to modify your suggestion.

1) Google difference plate sheet etc.

you will be surprised howmany answers are shown up.

2) Check CR4 threads the tube and pipe has been covered in detail at least 3-4 times recently/

Plate sheet - http://cr4.globalspec.com/thread/18671

Tube pipe (only one of these) http://cr4.globalspec.com/thread/11077

etc

One thing that has always stuck in my mind regarding the difference between pipe and tube (besides the manner in which they are dimensioned) is that pipes are used to convey fluids, while the main function of tubes is to convey/transfer heat.

One more difference I observed is tubes can be collapsible and closed ended, where as pipes are rigid in general with open ended, My own thought-----------

We carry a lot of hydraulics through tubes.

As I mentioned in an earlier thread the tubes have high control on OD - whether for expansion (boiler tbes) or using fittings (Swagelok or other compression fittings)

Pipes are useually not having that close control on OD - since these are usied for normally welding/ threaded connections.

Of course we do have some special fittings for pipes, but are very uncommon, as far as I know.

1) tube and pipe.

JUst want to give you and idea. A tube is measured/specified by its outside diameter and wall thickness while a pipe is measured/specified by its mean diameter and schedule.

2) plate and sheet

In english measurement, a sheet when its thickness is less than or equal to 1/8" and plate when its thickness is more than 1/8". (as our "rule of thumb")

Hi....Paresh,

Technically a tube or pipe is the ratio of the diameter to it's length. Incase the length is infinite you could continue to call it a tube e.g. the underground railway is called a tube because of it's long length.

Similarly very large sizes of flat products in a steel mill say in the continues casting section are addressed as sheets. They can call a 10mm thick plate a sheet because the lenght could be 50 or 100 meters long!!!

-- ditto --- for wires & ropes.

These are silly questions. Just try telling me difference between a screw & a bolt.

Anil Tiwari / Delhi.

thanks for reply

here is about ur question...hope i have tried for it.

From the Machinery's Handbook, 25th ed.:

"A bolt is an externally threaded fastener designed for insertion through holes...and is normally inteded to be tightened or released by torquing a nut. A screw is an externally threaded fastener capable of being inserted into holes... with a preformed internal thread or forming its own thread and of being tightened or realeased by torquing the head".

Don't forget to include a dictionary with your order of pipes/tubes. Some contractors don't know the difference between hole and whole, two and to or too, read,read and red, break and brake, where and wear, sea and see, bored and board, just to name a few.

Thats hysterical ....... I'm gonna give a copy of that to the guys in the pipe shop.

Round tube generally doesn't have a weld seam running down the length of it that you can feel with your finger and it has accurate outside and inside diameters.

Pipe generally has a seam and there is a great deal of tolerance allowed for wall thickness making it's inside diameter slightly larger then the size called out. For example the ID of a 1-1/2" Sch 40 pipe might measure as much as 1-9/16.

Sheet is identified by Gauge and Plate is identified by a fractional denomination. For example 7 Gauge Sheet, 3/16" Plate.

We've always referred raw round solid material as round bar. I think a rod refers to material that is a certain length and has a more accurate dimension then round bar.

Wire consists of a single strand or a few strands that aren't braided. Wire that has been braided together for the purpose of tying things up is wire rope, which consists of many strands for their collective strength.

thank you very much for the answer ........it is quite related to what i want....

ERW is permitted procedure for both pipes and tubes.

Seamless - pipes and tubes both are available.

1" Schedule 80 ID is 0.957" and 160 is 0.815

Plate and Sheet are based on thickness as mentioned earlier (of course gauge is OK)

Terminology is always never ending discussion.