GB/T 1047-2019Pipework components - Definition and selection of nominal size (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 1047-2005, Pipework components - Definition and

selection of DN (nominal size). Compared with GB/T 1047-2005, in addition to editorial

changes, the major technical changes are as follows:

-- it adds nominal sizes DN 550, DN 650, DN 750, DN 850, DN 950, DN 1050, DN

1150, DN 1300, DN 1700, DN 1900, DN 2100, DN 2300, DN 2500, DN 2700, DN

2700 and DN 2900 (see 3.1; Clause 3 of 2005 edition);

-- it adds the correspondence between nominal size DN and NPS (see Annex A).

This Standard was redrafted by referencing to ISO 6708:1995, Pipework components

- Definition and selection of DN (nominal size). This standard was nonequivalent to

ISO 6708:1995.

This Standard was proposed by the China Machinery Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee 237 on

Pipeline Fittings of Standardization Administration of China (SAC/TC 237).

The drafting organizations of this Standard: China Productivity Center for Machinery,

Sinopec Engineering Incorporation, MCC Capital Engineering and Research

Incorporation Co., Ltd., China Sinogy Electric Engineering Co., Ltd., China Energy

Engineering Group Guangdong Electric Power Design Institute Co., Ltd., Chaoda

Valve Group Co., Ltd., China Institute of Marine Technology and Economy, Saint-

Gobain Pipework System Co., Ltd., East China University of Science and Technology.

1 Scope

This Standard gives the definition of DN (nominal size) of pipework components, and

specifies the nominal size series used for pipework components.

This Standard applies to pipework components which use the DN designation system.

2 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

2.1

nominal size

An alphanumeric designation of size for components of a pipework system, which is

used for reference purposes. It comprises the letters DN followed by a dimensionless

whole number.

NOTE 1: This dimensionless number is directly related to the physical size, in millimetres, of

the bore or outside diameter of the end connections.

NOTE 2: The number following the letters DN does not represent a measurable value and

should not be used for calculation purposes except where specified in the relevant standard.

3 DN series and selection