HG/T 20623-2009: Large diameter steel pipe flanges (PN designated)

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Scope

1.0.1 This national standard specifies nominal dimension, nominal pressure, material,
pressure-temperature rating, flange type, dimension, seal contact face, tolerance and marking
of larger diameter steel pipe flanges (Class designated).
1.0.2 This Standard is applicable to larger diameter weld neck steel pipe flanges and blind
flanges with nominal pressure of Classl50 (PN20)~Class900 (PN150). The nominal pressure
grade of the flange is denoted by Class, including the following four grades. Classl50,
Class300, Class600 and Class900.
1.0.3 This Standard includes A and B two dimensions series of larger diameter steel pipe
flange, and clear marking must be indicated when being adopted.
1.0.4 The applied nominal dimension DN and outside diameter of the steel pipe in this
Standard are in accordance with those specified in Table 1.0.4.
Table 1.0.4 Inside Nominal Diameter and Outside Diameter of the Steel Pipe
Nominal dimension
DN 650 700 750 800 850 900 950 1000
NPS 26 28 30 32 34 36 38 40
Outside diameter of the steel pipe (mm) 660 711 762 813 864 914 965 1016
Nominal dimension
DN 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500
NPS 42 44 46 484 50 52 54 56 58 60
Outside diameter of the steel pipe (mm) 1067 1118 1168 1219 1270 1321 1372 1422 1473 1524
1.0.5 This Standard is also applicable to valve, pump, chemical engineering machinery,
pipeline fittings and equipment spares with flanges being used as type of attachment.
1.0.6 This Standard excludes selection principle for materials under particular fluid operating
conditions.

Basic Data

Standard ID	HG/T 20623-2009 (HG/T20623-2009)
Description (Translated English)	Large diameter steel pipe flanges (PN designated)
Sector / Industry	Chemical Industry Standard (Recommended)
Classification of Chinese Standard	J15
Classification of International Standard	23.040.60
Word Count Estimation	54,590
Date of Issue	2009-02-05
Date of Implementation	2009-07-01
Older Standard (superseded by this standard)	HG 20623-1997
Quoted Standard	JB 4728; JB 4726; GB/T 152.4; HG/T 20615; HG/T 20627; HG/T 20628; HG/T 20630; HG/T 20631; HG/T 20632; HG/T 20633; HG/T 20634; HG/T 20635; JB 4727
Regulation (derived from)	Engineering [ 2009 ] No. 27
Issuing agency(ies)	Ministry of Industry and Information Technology
Summary	This standard specifies the large diameter steel pipe flanges (Class Series) nominal size, nominal pressure, the material, the pressure temperature rating, flange type and size, sealing surfaces, tolerances and markings. This standard applies to nominal Class150 (PN20) to ~ Class900 (PN150) large-diameter welded steel pipe flange with neck and flange cover. Nominal grade flange using Clas said, including the following four levels: Class150, Class300, Class600, Class900. This standard covers both A and B size series of large diameter steel pipe flanges, the choice must be clearly marked. This standard applies to the nominal size of the pipe and the pipe diameter DN requirements in Table 1. 0. 4. This standard also applies to the use of flange connection form as valves, pumps, chemical machinery, piping accessories and equipment components. This standard does not include special fluid conditions from material selection principles.