3 replies to this topic

[Anil Panchal]

i am m.tech student in industrial process equipment design. What is the exact definition of pipe and tube? what is the difference among them?

[kumaqal.engr]

Sir,
In simple words
A pipe is a vessel
A tube is structural.

We measure pipe by Internal Dia. As pipes have a consistent id regardless of wall thickness. e.g 3 inch pipe available in different Schedule no 40, 80 but it's Internal dia "ID" remain same

In case of TUBE it's Outer Dia "OD" remain same. As wall thickness vary so It's InnerDia vary but It's outer dia remain same.

[fallah]

Sir,
In simple words
A pipe is a vessel
A tube is structural.

We measure pipe by Internal Dia. As pipes have a consistent id regardless of wall thickness. e.g 3 inch pipe available in different Schedule no 40, 80 but it's Internal dia "ID" remain same

In case of TUBE it's Outer Dia "OD" remain same. As wall thickness vary so It's InnerDia vary but It's outer dia remain same.

As far as i know, in the case of the pipe OD will remain same with increasing Schedule No. while ID is decreased due to wall thick. increasing.Therefore your statement in this regard isn't true.

[srtools1980y]

hi!

2 parameters decide whether it's a tube or pipe. they are wall thickness & dia.

if the wall thickness is expressed in ga(u)ge no. it's tube, whereas if it is in schedule no. or class then it's pipe.

if the dia is 6mm (1/4'') or less it's tube, whereas if it is more than 6mm it's pipe.


tube is available in coil form, not pipes due to the simple fact that pipe wall thickness does not permit coiling.

hose is non metallic tube/pipe available in coiled form.

above information holds good for sheets & plates also.

sheet thickness is expressed in gage nos. (5/6mm & less) and available in rolls, whereas plate thickness is expressed in mm/inch (5/6mm & more) & available in straight form only due to the simple fact, the thickness does not permit coiling.

hope this is useful.

goodday

srt.