What is the difference between pipe and tube?
The primary difference between pipe and tubing is how the size
is designated. Pipe is designated by a "Nominal Pipe Size" based
upon the ID (inside diameter) of the most common wall thickness.
Tubing is designated by the measured OD (outside diameter). For
Example: A 3/4 inch iron pipe has an OD of 1.050 inches, while a
3/4 inch steel tube has an OD of 0.75 inches.
The Copper industry calls all cooper tubular products "Tubes"
but they designate a "Type". Each type has specified OD and ID
The size of a tube is determined by it's OD and the thickness.
The actual OD of a tube is just the same as it's nominal OD. A
certain size of a tube will keep the same OD no mater what the
thickness is. It is true for pipe except that the actual OD is
larger than it's nominal OD.
For example, for a 1" schedule 5s pipe, the actual OD is 1.315",
the thickness is 0.065" and the ID is 1.185". When it's thickness
is schedule xxs (0.358"), then it's ID is reduced to 0.599" while
keeping it's OD. Furthermore, the actual OD of a pipe is just the
same as it's nominal OD when the size is the same as or larger than
14" per ASME/ANSI B36.10/19 . Consequently, both the size of tube
and pipe is measured by it's OD and the thickness.
Actually tube is used when we need to transfer heat from its
walls and we want this to be happen while in pipes we try to stop
the heat transfer such as we use tubes in boilers because we make
steam we need to transfer the heat while when we transport steam we
use pipes because we wana save heat energy.
2: pipe can be thick according to formula d/t >10 while tube
will must thin according to this formula.
The Real Difference:
Sorry to say; wrong! Pipe and tube is ever so simple. Pipes are
used to transport something, and tubes to construct something;
hence, tubes are defined by the od "outside diamater" and wt "wall
thickness" (for construction stability), and pipes id inside
diamater to allow a calculation for transportation viz., speed,
volumes etc. (od = id + 2 * wt).