PDF GB/T 17241.6-2008 English (GB/T 17241.6-1998: Older version)
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Integral cast iron flanges [including MODIFICATION 1]
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Integral cast iron pipe flanges
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GB/T 17241.6-2008: PDF in English (GBT 17241.6-2008) GB/T 17241.6-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040.60
J 15
Replacing GB/T 17241.6-1998 and GB/T 2503-1989
Integral Cast Iron Flanges
ISSUED ON. AUGUST 25, 2008
IMPLEMENTED ON. APRIL 1, 2009
Jointly Issued by. General Administration of Quality Supervision,
Inspection and Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Types and Dimensions ... 5
4 Technical Requirements ... 19
No.1 Modification List... 20
Foreword
"Cast Iron Pipe Flanges" (GB/T 17241) is divided into 7 parts.
— GB/T 17241.1 Synoptic Table for Cast Iron Pipe Flanges;
— GB/T 17241.2 Cast Iron Pipe Blank Flanges;
— GB/T 17241.3 Hubbed Threaded Cast Iron Pipe Flanges;
— GB/T 27241.4 Hubbed Slip-on-welding and Hubbed Socket Welding Cast Iron
Pipe Flanges;
— GB/T 17241.5 Loose Hubbed Cast Iron Pipe Flanges for Lapped Pipe End;
— GB/T 17241.6 Integral Cast Iron Flanges;
— GB/T 17241.7 Specifications for Cast Iron Pipe Flanges.
This part adopts the relevant parts of ISO 7005-2.1988 "Metallic Flanges - Part 2. Cast
Iron Flanges" by reference. The types and dimensions of the integral cast iron flanges in
this part are consistent with those specified in ISO 7005-2.1988, but compiled in different
formats.
This part is the revision of GB/T 17241.6-1998 "Integral Cast iron Pipe Flanges" and GB/T
2503-1989 "Marine Cast Iron Pipe Flanges".
Compared with the original standard, the main changes of this standard are as follows.
— The original two standards are integrated into one; and the standard name and
compiling format are modified;
— The flange rating marks belonging to American System in the former standard are
modified, e.g. PN20 is marked as Class150, and PN50 is marked as Class300;
— Marking examples are modified.
This standard shall replace GB/T 17241.6-1998 and GB/T 2503-1989, from the
implementation date.
This part was proposed by China Machinery Industry Federation.
This part shall be under the jurisdiction of National Technical Committee on Pipe Fitting of
Standardization Administration of China.
Drafting organizations of this part. China Productivity Center for Machinery, and Zhejiang
Gaoqiangdu Fasteners Co., Ltd.
Participating drafting organizations of this part. China Technology Research & Economy
Development Institute, and Jinan Meide Casting Co., Ltd.
Chief drafting staffs of this part. Li Junying, Luo Fayuan, Ge Haiquan, Feng, and Zang
Guiming.
The previous editions replaced by this part are.
— GB/T 17241.6-1998;
— GB 2503-81 and GB/T 2503-1989.
Integral Cast Iron Flanges
1 Scope
This part of GB/T 17241 specifies the types and dimensions of the integral gray cast iron,
malleable cast iron and ductile cast iron flanges with the nominal pressure of PN2.5, PN6,
PN10, PN16, PN25, PN40, Class150, and Class300.
This part is applicable to the design, manufacture and acceptance of DN10~DN4000 gray
cast iron, malleable cast iron, and ductile cast iron integral cast iron flanges.
2 Normative References
The following standards contain provisions which, through reference in this part of GB/T
17241, constitute provisions of this part. For dated reference, the subsequent
amendments (excluding correction) or revisions of these publications do not apply.
However, the parties who enter into an agreement based on this part are encouraged to
investigate the possibility of applying the most recent editions of the standards. For
undated references, the latest edition of the normative document referred to applies.
GB/T 17241.7 Specifications for Cast Iron Pipe Flanges
3 Types and Dimensions
3.1 The types and dimensions of PN2.5, PN6, PN10, PN16, PN25 and PN40
flanges shall meet the requirements of Figure 1 and Tables 1 ~ 6.
3.2 The types and dimensions of Class150 and Class300 flanges shall meet the
requirements of Figure 1 and Table 7 ~ Table 8.
500 670 620 28 20 M24 582 4 3d 26.5 — 559 12
600 780 725 31 20 M27 682 5 36 30 — 658 12
700 895 840 31 24 M27 794 5 40 32.5 — 772 12
800 1015 950 34 24 M30 901 5 44 35 — 876 12
900 1115 1050 34 28 M30 1001 5 46 37.5 — 976 12
1000 1230 1160 37 28 M33 1112 5 50 40 — 1080 12
1200 1455 1380 40 32 M36 1328 5 56 45 — 1292 12
1400 1675 1590 43 36 M39 1530 5 62 46 — 1496 12
1600 1915 1820 49 40 M45 1750 5 68 49 — 1712 12
1800 2115 2020 49 44 M45 1950 5 70 52 — 1910 15
2000 2325 2230 49 48 M45 2150 5 74 55 — 2120 15
Table 4 Dimensions of PN 16 Integral Cast Iron Flanges
mm
Nominal
dimension
DN
Connection dimension Sealing surface Flange thickness
Neck
diameter
Corner
radius
Outer
diameter of
flange D
Diameter of
center circle
of bolt hole
Diameter of
bolt hole
Bolt Outer
diameter
Height
Number
Thread
specification
Gray cast
iron
Ductile cast
iron
Malleable
cast iron
10 90 60 14 4 M12 41 2 14 — 14 28 3
15 95 60 14 4 M12 46 2 14 — 14 32 3
20 105 75 14 4 M12 56 2 16 — 16 40 4
25 115 85 14 4 M12 65 3 16 — 16 50 4
32 140 100 19 4 M16 76 3 18 — 18 60 5
40 150 110 19 4 M16 84 3 18 19 18 70 5
500 730 660 37 20 M33 609 4 52 36.5 — 580 12
600 845 770 40 20 M36 720 5 56 42 — 684 12
700 960 875 43 24 M39 820 5 — 46.5 — 780 12
800 1085 990 49 24 M45 928 5 — 51 — 882 12
900 1185 1090 49 28 M45 1028 5 — 55.5 — 982 12
1000 1320 1210 56 28 M52 1140 5 — 60 — 1086 12
1200 1530 1420 56 32 M52 1350 5 — 69 — 1296 12
1400 1755 1640 62 36 M56 1560 5 — 74 — 1508 12
1600 1975 1860 62 40 M56 1780 5 — 81 — 1726 12
1800 2195 2070 70 44 M64 1985 5 — 88 — 1920 15
2000 2425 2300 70 48 M64 2210 5 — 95 — 2150 15
Table 6 Dimensions of PN 40 Integral Cast Iron Flanges
mm
Nominal
dimension
DN
Connection dimension Sealing surface Flange thickness
C Neck
diameter
Corner
radius
Outer
diameter of
flange
Diameter of
center circle
of bolt hole
Diameter of
bolt hole
Bolt Outer
diameter
Height
Number
Thread
specification
Gray cast
iron
Ductile cast
iron
Malleable
cast iron
10 90 60 14 4 M12 41 2 16 — 14 28 3
15 95 65 14 4 M12 46 2 16 — 14 32 3
20 105 75 14 4 M12 56 2 18 — 16 40 4
25 115 85 14 4 M12 65 3 18 — 15 50 4
32 140 100 19 4 M16 76 3 20 — 18 60 5
40 150 110 19 4 M16 84 3 20 19 18 70 5
No.1 Modification List
GB/T 17241.6-2008 "Integral Cast Iron Flanges"
National Standardization Committee approved to implement from July 1, 2011.
1. Page. 3
The thickness “c” of integral cast iron flange corresponding to the nominal dimension
of DN 500 in "Table 2 Dimensions of PN 6 Integral Cast Iron Flanges" is changed
from 20 to 30.
2. Page. 5
Table 4 Dimensions of PN 16 Integral Cast Iron Flanges
Nominal dimension DN Previous – Thread specification of bolt
Modified to be –
Thread specification of bolt
250 M20 M24
300 M20 M24
350 M20 M24
400 M24 M27
450 M24 M27
500 M24 M30
600 M27 M33
700 M27 M33
800 M30 M36
900 M30 M36
1000 M33 M39
1200 M36 M45
1400 M39 M45
1600 M45 M52
1800 M45 M52
2000 M45 M56
3. Page. 8
The diameter “L” of bolt hole corresponding to the nominal dimension of
NPS24/DN600 in "Table 7 Dimensions of Class150 (PN20) Integral Cast Iron
Flanges" is modified from 32.5 to 35.5.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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