This standard applies to pipe fittings with longitudinal welds made of carbon steel, low alloy steel and austenitic stainless steel plates, including tees (equal diameter and reducing diameter), elbows (short radius 90 and long radius 90 450), reducers (concentric and eccentric), divided into two series 1 and I. HG/T 21631-1990 Steel seam butt welding pipe fittings HG/T21631-1990 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
HG/T21631-1990
Steel Seam Butt-Welded Pipe Fittings
1991-02-01
Ministry of Chemical Industry of the People's Republic of China
1991-05-01
According to the spirit of the notice on the standard use of standard codes issued by the State Bureau of Petroleum and Chemical Industry, the State Bureau of Quality and Technical Supervision and the Ministry of Construction, after rectification and in accordance with the provisions of the leading departments on the conversion of standard codes, the original HGJ528-90 standard number is converted to HGT21631-1990. All standard numbers "HGJ528-90" appearing in this standard should be understood to have been converted to "HG/T21631-1990", that is, the original standard number HGJ528-90 has been cancelled and replaced by the new standard number HG/T21631-1990. All users and relevant personnel are requested to comply with the implementation. This is to inform you.
National Chemical Engineering Construction Standard Editing Center Industry Standard of the People's Republic of China
Steel Seam Butt-Weld Pipe Fittings
HG/T21631-1990
Editor: Chemical Process Piping Design Technology Center of the Ministry of Chemical Industry Approved by: Ministry of Chemical Industry of the People's Republic of China Implementation Date: May 1991
National Chemical Engineering Construction Standard Editing Center (formerly the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry) 2002
According to the arrangement of the Infrastructure Department of the Ministry of Chemical Industry, the Chemical Process Piping Design Technology Center of the Ministry of Chemical Industry organized the compilation of the design standards and technical regulations for the chemical process piping design profession as a ministerial directive technical document to guide the design and manufacture of process piping. "Steel Seam Butt-Weld Pipe Fittings" stipulates the testing, acceptance and packaging of equal-diameter tees, reducing tees, elbows, reducing pipes and finished products.
This standard is edited by Feng Shuyuan of the Chemical Process Piping Design Technology Center of the Ministry of Chemical Industry. Tang Shixuan checked and Xia Dekai reviewed. This standard was extensively investigated and studied during the preparation process, summarizing the design experience of various chemical design units over the years. It was finalized after review by the central station and submitted to the Ministry for approval. In the process of implementing this standard, if any units find that there is a need for modification or supplementation, please provide your opinions and relevant information to the Chemical Process Piping Design Technology Central Station of the Ministry of Chemical Industry for reference in future revisions. Chemical Process Piping Design Technology Center of the Ministry of Chemical Industry December 1990
Equal Diameter Tees
Reducing Tees
Reducing Pipes,
Fitting End Bevels
Technical Requirements
Finished Product Test
10 Acceptance·
11 Marking and Printing
1 Packaging
Appendix A Instructions for the Preparation of the Wall Thickness Grading Table for the Ends of Steel Butt-Welded Pipe Fittings
(14)
(15)
1 General
This standard applies to pipe fittings with longitudinal weld chains made of carbon steel, low alloy steel and austenitic stainless steel plates, including tees (equal diameter and reducing diameter), elbows (short radius 90° and long radius 90%, 45°), and reducers (concentric and eccentric), which are divided into two series: [and 1.
According to the current domestic production needs and manufacturing possibilities, the diameter ranges of three types of pipe fittings are determined: the nominal diameters of equal-diameter (reducing-diameter) tee main pipes, elbows, and reducers are from 300 to 1000 mm (12″ to 40), and the nominal diameters of reducing tee branches and reducers are from 150 to 900 mm (6 to 36*). The wall thickness series of pipe fittings are listed in Table A1 and Table A2 in Appendix A for reference by manufacturers and users. The units used in this standard are: length is mm, pressure is MPa1| |tt||Nominal diameter
2Equal diameter tee
Equal diameter tee
End outer diameter
1 Series
323.9
Straight series
Distance from center to end face
300×300×250
300×300×200
300×300×150
350×350×300
350×350×250
350× 350×200
400×400×350
400×400×300
400 50×450×300)
(450×450×250)
12×12×10
12×1 2 × 8 | | tt | | 12 × 12 × 6 | | tt | | 14 × 14 × 12 | | tt | 18×16
18×18×14
18×18×12
18×18×10
3.Reducing tee
, "series
straight series
1 series
219.1
355.6
325,
center to end face distance
continued table 2
500×500×400
500×500×350
500×500×300
500×500×250||tt ||(550×550×500)
(550×550×400)
(550×550×350)
500×600×500
600×600×400
600×600×350
(650×650×600)
（650×650×500）
（650×650×40 0)
700 × 700 × 600 ||tt | 16
20×20×14
20×20×12
2 0 × 20 × 10 | | tt | | 22 × 22 × 20 | | tt | t||26×26×16
28×28×24
28×28×2 0
28×28×16
30×30×24
30×30×20
30×30×16
1 series
I series
1 series
406.4
Distance from center to end face
Continued Table 2
(mm）
800×800×700
800× 800 × 600 | | tt | | 800 × 800 × 500 | 900×900×600
(950×950×800)
(9 50×950×700)
(950×950×600)
1000×1000×900
1000×1000X800
1000×1000×700
32×32×28
32×32×24
32×32×20
34×34×32
34×34×28| |tt||34×34×24
36×36×32
36×36×28
36×36×24
38×38×32
38×38×28
38×38×24
40×40×36
40×40×32
40×40×28
Note: The values ​​in brackets are not recommended. I series
1 series
「series
1 series
Distance from center to end face
45° elbow (long radius)
(mm）
90° elbow (short radius)
45° elbow, 90° through-head series dimensions
Outer diameter
1 series
1 series
|90 head (long radius)
Distance from center to end face
45\elbow B
Long radius
90\elbow A
Short radius
90°elbow A
Long radius
(mm）
399x250www.bzxz.net
300×200
305×150||t t||350 × 3C0 ||tt | |tt||14×12||tt| |14×10
16×14
16×15
18×16
18×14
18×12
5 Reducers
Reducers
1 Series
1 Series
1 Series
：373
Positive Series
Hood Surface to End Surface
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