8/11/2019 Steel Pipe Sizes

1/6

Standard Pipe Sizes

Except for specialist

applications, commercially available pipe comes in standard sizes. Pipes in a variety of materials - including carbon

steel, steel alloys, as well as some plastics - are manufactured in these standard sizes.

The pipe size is specified with two numbers: the nominal pipe diameter or bore! and the pipe schedule. This then

sets the outside pipe diameter, the wall thic"ness and hence the internal diameter!. # list of common standard pipe

sizes are given below.

A Table of the Most Common Standard Pipe Sizes

8/11/2019 Steel Pipe Sizes

2/6

8/11/2019 Steel Pipe Sizes

3/6

Nominal Bore 2 inch (DN mm!" #$tside Diameter )%& mm

$chedule $ch. % $ch. &' $T( )$ $ch. &*' ))$

+all thic"ness mm! &. .0 .2 %.% 0. &&.&

1nternal (iameter mm! %*.2 %/. %.% /2. /.2 0.&

$chedule /' has same dimensions as $T(. $chedule 0' has same dimensions as )$.

Nominal Bore & inch (DN + mm!" #$tside Diameter ++%, mm

$chedule $ch. % $ch. &' $T( )$ $ch. &*' ))$

+all thic"ness mm! .& .' %.% .* &&.& &%.

1nternal (iameter mm! 0/. 0.2 .2 . **. %0.%

$chedule /' has same dimensions as $T(. $chedule 0' has same dimensions as )$.

Nominal Bore ' inch (DN 1 mm!" #$tside Diameter 11'%& mm

$chedule $ch. % $ch. &' $T( )$ $ch.&' $ch. &*' ))$

+all thic"ness mm! .& .' *.' 0.* &&.& &./ &.&

1nternal (iameter mm! &&'.& &'0. &'. 2.& 2.& 0.% 0'.&

$chedule /' has same dimensions as $T(. $chedule 0' has same dimensions as )$.

Nominal Bore inch (DN 12 mm!" #$tside Diameter 1'1%& mm

$chedule $ch. % $ch. &' $T( )$ $ch. &' $ch. &*' ))$

+all thic"ness mm! .0 ./ *.* 2.% &. &%.2 &2.'

1nternal (iameter mm! &%. &/.% &0.& &. &&%.2 &'2.% &'.

$chedule /' has same dimensions as $T(. $chedule 0' has same dimensions as )$.

Nominal Bore ) inch (DN 1 mm!" #$tside Diameter 1)+%& mm

$chedule $ch. % $ch. &' $T( )$ $ch. &' $ch. &*' ))$

+all thic"ness mm! .0 ./ .& &&.' &/. &0. .'

1nternal (iameter

mm!&*. &*&.% &%/.& &/*. &2. &&. &/.

$chedule /' has same dimensions as $T(. $chedule 0' has same dimensions as )$.

Nominal Bore + inch (DN 2 mm!" #$tside Diameter 21,%1 mm

8/11/2019 Steel Pipe Sizes

4/6

$chedule $ch. %$ch.

&'

$ch.

'

$ch.

'

$ch.

/'

$ch.

*'$ch. 0'

+all thic"ness mm! .0 .0 *./ .' 0. &'. &.

1nternal (iameter

mm!

&.% &&.% '*. '%.& '. &20.% &2.

$chedule $ch. &'' $ch. &' $ch. &/' $ch. &*' ))$

+all thic"ness mm! &%.& &0. '.* .' .

1nternal (iameter mm! &00.2 &0. &.2 &.& &/.

Nominal Bore 1 inch (DN 2 mm!" #$tside Diameter 2*&% mm

$chedule $ch. % $ch. &' $ch. ' $ch. ' $ch. /' $ch. *' $ch. 0'

+all thic"ness mm! ./ /. *./ .0 2. &. &%.&

1nternal (iameter mm! **. */.* *'. %./ %/./ /.* /.0

$chedule $ch. &'' $ch. &' $ch. &/' $ch. &*' ))$+all thic"ness mm! &0. &./ %./ 0.* %./

1nternal (iameter mm! *.* '. . &%.0 .

Nominal Bore 12 inch (DN & mm!" #$tside Diameter &2&%, mm

$chedule$ch.

%s$ch. % $ch. &'

$ch.

'

$ch.

'

$ch

/'s$ch. /'

+all thic"ness mm! /.' /. /.* *./ 0./ 2.% &'.

1nternal (iameter

mm! &%.2 &%.% &/. &&.& '.& '/.2 '.

$chedule $ch. *' $ch. 0' $ch. &'' $ch. &' $ch. &/' $ch. &*'

+all Thic"ness mm! &/. &.% &./ %./ 0.* .

1nternal (iameter mm! 2%. 0.2 0&.& .& **. %.

Nominal Bore 1' inch (DN & mm!" #$tside Diameter &%) mm

$chedule$ch.

%s

$ch.

&'$$ch. &'

$ch.

'$ch. ' $ch /' )$

+all thic"ness mm! /.' /.0 *./ .2 2.% &&.& &.1nternal (iameter

mm! /. /*.' /.2 2.0 *.* . '.

$chedule $ch. *' $ch. 0' $ch. &'' $ch. &' $ch. &/' $ch. &*'

+all Thic"ness mm! &%.& &2.& .0 .0 &.0 %.

1nternal (iameter mm! %./ &.% '0.' ''.' 2.& 0/.

$T( has same dimensions as $chedule '.

8/11/2019 Steel Pipe Sizes

5/6

Nominal Bore 1) inch (DN ' mm!" #$tside Diameter ')%' mm

$chedule $ch. %s $ch. &'$ $ch. &' $ch. ' $ch. ' $ch /'

+all thic"ness mm! /. /.0 *./ .2 2.% &.

1nternal (iameter mm! 20.' 2*.0 2. 2'.* 0./ 0&.'

$chedule $ch. *' $ch. 0' $ch. &'' $ch. &' $ch. &/' $ch. &*'

+all Thic"ness mm! &*.* &./ *. &.' *.% /'.%

1nternal (iameter mm! .& *.% %/.' //.% ./ %./

$T( has same dimensions as $chedule '. )$ has the same dimensions as $chedule /'.

Pipe Diameters

There are two common pipe size standards: the #merican #7$18#$9E8#P1! standard, which is in imperial units, and

the European (17! system which uses metric units. 1n the #merican system, the pipe diameter is "nown as

7ominal Pipe $ize 7P$! or 7ominal ;ore 7;!. 1n the European system, it is "nown as the 7ominal (iameter

(7!. The most common standard diameters are as follow: '.% inch &% mm!, '.% inch ' mm!, & inch % mm!, &.%

inch /' mm!, inch %' mm!, inch 0' mm!, / inch &'' mm!, * inch &%' mm!, 0 inch '' mm!, &' inch %'

mm!, & inch '' mm!, &/ inch %' mm!, &* inch /'' mm!, &0 inch /%' mm!, ' inch %'' mm!, inch %%'

mm! and / inch *'' mm! - further sizes up to * inch are also available. 1t should be noted that some intermediate

standard pipe sizes are available commercially, such as % inch &% mm!, however these are less common.

3or pipe sizes with a 7; of &/ inch (7 %' mm! and above, the nominal bore is the same as the pipe

8/11/2019 Steel Pipe Sizes

6/6

as the pipe schedule changes, the internal diameter of the pipe changes. # spreadsheet for calculating pressure

drops in li6uids! is givenhere.

The 1( can be easily calculated, as long as the pipe 7; 8 (7 and schedule are "nown. The pipe 1( is given by the

pipe 7; minus double the pipe wall thic"ness which can be obtained from the pipe schedule!.

3or example, for a & 7; (7 '' mm! pipe, schedule /', the