GB/T 12459-2017 (GB/T 12459-2005) PDF English
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GB/T 12459-2005: Steel butt-welding seamless pipe fittings---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12459-2005
J 15
National Standard of the People's Republic of China
GBff 12459-2005
Replace GBff 12459-1990
Steel Butt-welding Seamless Pipe Fittings
(ASME Bl6.9.2001, Factory-made Wrought
Butt-welding Fittings, MOD)
Issued on: FEBRUARY 21, 2005
Implemented on: AUGUST 1, 2005
Issued by General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China
Standardization Administration of the People's Republic of China
Foreword
This standard is the revision of GB/T 12459-1990 Steel Butt-welding Seamless Pipe
Fittings.
This standard is modified in relation to ASME B 16.9.2001 Factory-Made Wrought
Buttwelding Fittings and is development according to domestic manufacturing conditions and
the original standard.
Compared with ASME Bl6.9.2001, this standard contains the following main
differences.
--Type (seamless), dimension (DN800 and lower) and technical requirements are
basically identical to ASME B 16.9, but adopt different format.
--Dimension ("series" dimensions) of welding end of pipe fittings connected to
"metric pipe" which is usually adopted in China is added;
--Decimal place of specific specifications of "outside diameter at the groove" is
slightly different from that in ASME B 16.9, such as "outside diameter at the groove" of DN20
pipe fitting is "26.7mm" in ASME Bl6.9, but is "26.9mm" herein.
--Symbols, codes, material, manufacturing, heat treatment, inspection, protection,
packaging and product quality certificate are addedo
Compared with GB/T 12459 - 1990, this standard contains the following main
amendments.
--Explanation for symbols of pipe fittings are added;
--Dimension of lapped nipple for flanged connection is added according to ASME
Bl6.9;
--Dimension scope is enlarged from the original DNl5-DN500 up to DN15-DN800.
Dimensions of long radius elbow, Tee, cross Tee, pipe cap and reducing connectors are
enlarged from DNl 5-DN500 up to DN15-DN 800.
--Requirements for materials and manufacturing process are added, requirements for
design and verification are supplemented and technical content, such as test, are amended.
Appendix A and Appendix B attached hereto are informative.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of Technical Committee of Standardization for
Pipe Fittings.
Drafting Organizations. China Academy of Machinery Science and Technology, Wuxi
Xinfeng Pipe-fittings Co., Ltd., Cangzhou Bohai Pipe Fittings
Co., Ltd., Jiangyin Nanfang Pipe Fitting Making Company
Ltd., Shanghai Gaoqiao Pipe Fitting Co., Ltd., Tianjin Jinding
Pipe Co., Ltd., Jiangyin Jintong Petrochemical Pipe Fittings
Co., Ltd., Jiangyin Hailu High Pressure Pipe Fittings Co., Ltd.,
Bangbu Pipe Fitings Factory, Baogang Xingyuan Seamless
Welfare Pipe Fittings Factory, Luoyang Petrochemical
Engineering Corporation, Central Southern China Electric
Power Design Institute and Northeast Electric Power Design
Institute
Chief Drafting Staff. Li Junying, Guo Shunxian, Zhu Quanming, Liu Shangci,
Shen Peizhong, Xin He, Yao Mingwen, Zhu Xiaofeng,
Wang Qingyao, Wang Hanqing, Li Suqin, Wen Qiding,
Huang Tao, Wang Junsheng, Huang Guohong
National Standard of the People's Republic of China
GBff 12459-2005
Replace GBff 12459-1990
Steel Butt~welding Seamless Pipe Fittings
1 Scope
This standard specifies requirements for symbols, codes, dimensions, tolerances,
materials, manufacturing, inspection, test, marking, protection and packaging of butt-welding
seamless pipe fittings made of DN15-DN800 (NPS1/2-NPS24) carbon steel, alloy steel and
stainless steel.
2 Normative Reference
The following documents contain contents which, through reference in this text,
composite provisions of this standard. For dated reference, subsequent amendments
(excepting corrigenda content) to, or revisions of, any of these publications do not apply.
Parties to agreements based on this standard are encouraged to investigate the possibility of
applying the most recent editions of the standards indicated below. For undated references,
the latest edition of the normative document referred to applies.
GB 150 Steel pressure vessels
GB/T 710 Hot-rolled quality carbon structural steel sheets and strips
GB/T 711 Hot-rolled quality carbon structural steel plates and wide strips
GB/T 713 Carbon and low alloy steel plates for boilers carbon and alloy steel plates for
boilers
GB/T 912 Hot-rolled sheets and strips of carbon structural steels and high strength low
alloy structural steels
GB/T 1047 Pipework components Definition and selection ofDN (nominal size)
GB 3087 Seamless steel tubes for low and medium pressure boiler
GB/T 3274 Hot-rolled plates and strips of carbon structural steels and high strength
low alloy structural steels
GB/T 3280 Cold rolled stainless steel plate sheet and strip
GB 3531 Low alloy steel plates for low temperature pressure vessels
GB/T 4237 Hot rolled stainless steel plate sheet and strip
GB/T 4238 Heat-resisting steel plate sheet and strip
GB 5310 Seamless steel tubes and pipes for high pressure boiler
GB 64 79 Seamless steel tubes for high-pressure for chemical fertilizer equipments
GB 6654 Steel plates for pressure vessels
GB/T 8163 Seamless steel tubes for liquid service
GB/T 9118.1-2000 Loose hubbed steel pipe flanges with welding neck collar with
raised face
GB/T 9118.2-2000 Loose hubbed steel pipe flanges with welding neck collar with
ring-joint face
GB/T 9124-2000 Specification for steel pipe flanges
GB/T 9948 Seamless steel tubes for petroleum cracking
GB/T 14976 Stainless steel seamless tubes for fluid transport
JB 4730 Nondestructive testing of pressure vessels
ASME B 16.5 Pipe Flanges and Flanged Fittings
ASME B 16.9.2001 Factory-Made Wrought Buttwelding Fittings
ASME B 36.10M.l996 Welded and Seamless Wrought Steel Pipe
ASME B 36.19M.1985 (Rl994) Stainless Steel Pipe
3 Symbols and Codes
3.1 Symbols
DN--Nominal dimension of metric pipe fittings; it is a non-measured value (see GB/T
1047);
NPS--Nominal size of pipe fittings using inch unit; it is a non-measured value;
A--Distance from the center on one end face of the 90° elbow to another end face
and from the center of 180° elbow to the center on the end face;
B--Distance from the center of 45° elbow to the end face;
C--Distance from the axial line of branch outlet of Tee and cross Tee to the end face
of the center part;
.D-Outside diameter at the groove of elbow, straight Tee, cross Tee and pipe cap;
outside diameter of the groove at the larger end ofreducing fittings;
D1--0utside diameter of groove at the smaller end of reducing fitting;
E--Total height of pipe cap (pipe end cover);
F--Length of lapped nipple;
G---Outside diameter of lapped nipple;
H--Distance from the one end face ofreducingjoint to the other end;
K--Distance from the end face of l 80°elbow to the top;
M--Distance from the central line of main body of Tee and cross Tee to the end face
of branch;
0-Distance from one end face of 180°elbow to the center of the other end face;
R--Fillet radius;
t--Specified wall thickness of the welding end of pipe fittings or the larger end of
reducing fittings;
t1--Specified wall thickness of welding end at the smaller end of reducing fittings;
T--Thickness of the lapped nipple.
3.2 Codes
For types and codes of butt-welding seamless pipe fittings, see Table I.
Table 1 Type and Codes of Pipe Fittings
Product Type Code
45° elbow Long radius 45E (L)
Long radius 90E (L)
90° elbow Short radius 90E (S)
Long radius reducing 90E(L) R
180° elbow
Long radius 180E(L)
Short radius 180E (S)
Concentric
Reducing joint (big and small ends) R(C)
Eccentric R (E)
Same T(S)
Tee
Reducing T(R)
Same CR(S)
Cross Tee
Reducing CR (R)
Pipe Cap c
Lapped Nipple
Long SE (L)
Short SE (S)
4 Dimensions and Tolerances
4.1 Standard dimension
4.1.1 Dimension of pipe fittings shall be in accordance with those specified in Figures I to
I 0 and Tables 3 to 12; Outside diameter at the end of pipe fittings have two series, including
series I and series II, the former of which is the series generally adopted internationally.
Classification of wall thickness of seamless steel pipe used to connect with series I pipe
fittings is listed in Appendix B.
4.1.2 For the convenience of international trade, inch dimensions of series I pipe fittings are
listed in Appendix A.
4.1.3 Due to the fact that metric unit and inch unit are not accurately identical, so users must
adopt these two kinds of units separately. Nominal dimension of pipe fittings adopting metric
unit shall be expressed as DN; nominal dimension of pipe fittings adopting inch unit shall be
expressed as NPS; for relations between these two symbols, see Table 2.
Table 2 Relations between DN and NPS
DN 15 20 25 32 40 50 65 80 90 100
NPS 1/2 3/4 I I V. Iv. 2 2\1, 3 3\1, 4
Note. Where NPS is larger than 4, DN = 25 x (NPS).
4.2 Particular dimension
4.2.1 Where fatigue loading is considered in the application, the purchaser shall provide the
minimum dimension required.
4.2.2 Requirements for the length of lapped nipple are usually determined by the service
condition and connection structure. Therefore, the purchaser must specify long lapped nipple
or short stub end in the order (see note 2 in Table 10).
4.3 Tolerances
Dimension deviation and geometrical tolerance of pipe fittings shall be in accordance
with those specified in Table 13 and Figure 11.
...
.@
Figure 1 Long Radius Elbow
___ ... A__ _ __
Figure 2 Long Radius Reducing Elbow
Table J Dimension of Long Radius Elbow Unit in millimeter
Outside Diameter at Groove Center to End Face Nominal Dimension D
DN Series I Series II 90°Elbow 45°Elbow
A B
15 21...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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