Appendix A: Nominal Sizes - Sullair ShopTek ST45 Operation & Maintenance Manual

ShopTek™ ST45, ST55, ST75 (U.S.A. & Mexico) Operation & Maintenance Manual
Appendix A:
Metric nominal size (DN) is the nominal size for valves,
flanges and fittings as defined by ISO 6708-1980. DN
designates the size of all components in a piping system
other than components designated by outside diameters
or by thread size. For example, steel tubes are desig-
nated and ordered by outside diameter and thickness.
Because DN is a round number that cannot be
measured and is only loosely related to manu-
facturing dimensions, you should only use the
DN number for reference and never for calcula-
tions.
A metric nominal size is indicated by the letters "DN" fol-
lowed by a number without any unit of measure. For met-
ric to imperial nominal size equivalents, refer to Table A-
1: Metric to Imperial nominal sizes.
Nominal Sizes
NOTE
Subject to EAR, ECCN EAR99 and related export control restrictions.
Table A-1: Metric to Imperial nominal sizes
Metric DN
(Nominal Size)
A dimensionless designation
6
8
10
15
20
25
32
40
50
65
80
88292021-240 R01
A: Nominal Sizes
Imperial NS
(Nominal Size)
Designated in inches
sometimes as ND, NB or NPS
⅛"
¼"
⅜"
½"
¾"
1"
1¼"
1½"
2"
2½"
3"
75