GB/T 1047-2005 English PDF (GBT1047-2005)

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GB/T 1047-2005: Pipework components -- Definition and selection of DN (nominal size)
GB/T 1047-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040.60
J 15
Replacing GB/T 1047-1995
Pipework components - Definition
and selection of DN (nominal size)
(ISO 6708.1995, MOD)
ISSUED ON. JANUARY 13, 2005
IMPLEMENTED ON. AUGUST 01, 2005
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Definition ... 4 
3 DN series ... 4 
Pipework components - Definition
and selection of DN (nominal size)
1 Scope
This standard specifies the definition and series of DN (nominal size).
This standard applies to pipework components specified in the relevant
standards using the DN marking.
Note. Other size marking methods different from this standard can also be used,
such as the pipework components of threading, press fitting, socket welding or
butt welding, or the pipework components which are marked by NPS (nominal
pipe size), OD (outer diameter), ID (inner diameter) or G (pipe thread size
marking).
2 Definition
DN. Size marking for the combination of letters and numbers for piping system
components. It consists of the letter DN followed by a dimensionless integer
number. This number is directly related to the feature size such as the hole
diameter or outer diameter (in mm) of the end connector.
Note 1. Except as otherwise provided in the relevant standards, the number
after the letter DN does not represent the measured value and cannot be used
for calculation purposes.
Note 2. For those standards using the DN marking system, it shall give the
relationship between the DN and the size of the pipework components, such as
DN/OD or DN/ID.
3 DN series
The preferred DN values are as follows.