GB/T 1048-2019Pipework components - Definition and selection of nominal pressure (English PDF)

Foreword

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

This Standard replaces GB/T 1048-2005, Pipework components. Definition and

selection of PN. Compared with GB/T 1048-2005, the main technical changes,

except editorial changes, are as follows:

-- Add the definition of the nominal pressure that is marked by Class (see

Chapter 2);

-- Add nominal pressure values PN 160, PN 250, PN 320 and PN 400 (see

Table 1);

-- Delete PN 20, PN 50, PN 110, PN 150, PN 260 and PN 420; replace with

Class 150, Class 300, Class 600, Class 900 and Class 1500 (see Table 1,

Chapter 3 of version 2005);

-- Add preferred values for the Class series (see Table 1).

This Standard uses the redrafting method to refer to ISO 7268:1983, Pipe

components - Definition of nominal pressure, NEQ; its degree of consistency

with ISO 7268:1983 is non-equivalent.

This Standard was proposed by China Machinery Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee

237 on Pipe Fitting of Standardization Administration of China (SAC/TC 237).

The drafting organizations of this Standard: China Productivity Center for

Machinery, Sinopec Engineering Incorporation, Capital Engineering &

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

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

Chaoda Valves Group Co., Ltd., China Institute of Marine Technology &

Economy, Saint Gobain Piping System Co., Ltd.

The drafters of this Standard: Li Junying, Feng Feng, Zhao Yong, Wu Shiming,

Li Qilue, Huang Tao, Qiu Xiaolai, Zhang Meiling, He Gen, Zhang Lanzhu.

The previous versions of the standards which are replaced by this Standard are:

-- GB/T 1048-1970, GB/T 1048-1990, GB/T 1048-2005.

Pipework components - Definition and selection of

nominal pressure

1 Scope

This Standard gives the definition of nominal pressure of the pipework

components, and specifies the nominal pressure series that are used for the

pipework components.

This Standard applies to pipework components which use PN or Class to mark

nominal pressure.

2 Terms and definitions

The following terms and definitions are applicable to this document.

3 Nominal pressure series and selection

The nominal pressure includes two series, namely PN and Class; the nominal

pressure values shall be selected from Table 1.

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