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  • Large diameter butt welding elbow
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  • Large diameter butt welding elbow
    The large-diameter butt-weld elbow is a steel hot-pressed or forged elbow. Its connection form is to directly butt-weld the elbow and the steel pipe.

     
    Standards for large-diameter butt-welding elbows:
    GB / T12459, GB / T13401, ASMEB16.9, SH3408, SH3409, HG / T21635, HG / T21631, SY / T0510, GB / T10752-1995.

     
    Material
    Carbon steel: 10 #, 20 #, A3, Q235A, Q345B, ASTM A234, ASTM A105, St37, ASTM A403, etc.
    Alloy steel: 20G, 16Mn, 12Cr1MoVG, P11, P22, etc.
    Stainless steel: TP304, TP316, TP310S, TP321, etc.



    Specification

    公称通径

    Nominal Diameter 
    端部外径

    Outside Diameter 
    at Bevel 
    中心至端面 
    Center to End
    中心至中心
    Center to Center
    背面至端面
    Back to Face

    45°弯头
    45°Elbow

            90°弯头
      90°Elbow

    180°弯头 
    180°Elbow
    B
           A
          O
           K

    DN

    NPS

    A 系列
    Series A
    B 系列
    Series B
    长半径
    Long 
    Radius
    长半径
    Long 
    Radius
    短半径
    Short
      Radius
    长半径
    Long 
    Radius
    短半径
    Short
      Radius
    长半径(A系列)
    Long 
    Radius
    短半径(A系列)
    Short
      Radius
    15
    1/2
    21.3
    18
    16
    38
    -
    76
    -
    48
    -
    20
    3/4
    26.9
    25
    19
    38
    -
    76
    -
    51
    -
    25
    1
    33.7
    32
    22
    38
    25
    76
    51
    56
    41
    32
    1.1/4
    42.4
    38
    25
    48
    32
    95
    64
    70
    52
    40
    1.1/2
    48.3
    45
    29
    57
    38
    114
    76
    83
    62
    50
    2
    60.3
    57
    35
    76
    51
    152
    102
    106
    81
    65
    2.1/2
    76.1(73)
    76
    44
    95
    64
    190
    127
    132
    100
    80
    3
    88.9
    89
    51
    114
    76
    229
    152
    159
    121
    90
    3.1/2
    101.6
    -
    57
    133
    89
    267
    178
    184
    140
    100
    4
    114.3
    108
    64
    152
    102
    305
    203
    210
    159
    125
    5
    139.7
    133
    79
    190
    127
    381
    254
    262
    197
    150
    6
    168.3
    159
    95
    229
    152
    457
    305
    313
    237
    200
    8
    219.1
    219
    127
    305
    203
    610
    406
    414
    313
    250
    10
    273.0
    273
    159
    381
    254
    762
    508
    518
    391
    300
    12
    323.9
    325
    190
    457
    305
    914
    610
    619
    467
    350
    14
    355.6
    377
    222
    533
    356
    1067
    711
    711
    533
    400
    16
    406.4
    426
    254
    610
    406
    1219
    813
    813
    610
    450
    18
    457.2
    478
    286
    686
    457
    1372
    914
    914
    686
    500
    20
    508.0
    529
    318
    762
    508
    1524
    1016
    1016
    762
    550
    22
    559
    -
    343
    838
    559
    1676 1118 1118 838
    600
    24
    610
    630
    381
    914
    610
    1829 1219 1219 914
    650
    26
    660
    -
    406
    991
    660
    1982 1320 - -
    700
    28
    711
    720
    438
    1067
    711
    2134 1422 - -
    750
    30
    762
    -
    470
    1143
    762
    2286 1524 - -
    800
    32
    813
    820
    502
    1219
    813
    2438 1626 - -
    850
    34
    864
    -
    533
    1295
    864
    2590 1728 - -
    900
    36
    914
    920
    565
    1372
    914
    2744 1828 - -
    950
    38
    965
    -
    600
    1448
    965
    2896 1930 - -
    1000
    40
    1016
    1020
    632
    1524
    1016
    3048 2032 - -
    1050
    42
    1067
    -
    660
    1600
    1067
    3200 2134 - -
    1100
    44
    1118
    1120
    695
    1676
    1118
    3352 2236 - -
    1150
    46
    1168
    -
    727
    1753
    1168
    3506 2336 - -
    1200
    48
    1220
    1220
    759
    1829
    1219
    3658 2440 - -
    The above dimensions comply with GB / T12459, GB / T13401, ASME B16.9, SH3408, SH3409, HG / T21635, HG / T21631, SY / T05010 standards


     
    Classification of butt welding elbow
    (1) Butt welding elbow is divided according to its radius of curvature, which can be divided into long radius butt welding elbow and short radius butt welding elbow. The radius of curvature of the long radius butt-weld elbow is equal to 1.5 times the outer diameter of the pipe, ie R = 1.5D. The radius of curvature of the short radius butt-weld elbow is equal to the outer diameter of the pipe, ie R = 1D. In the formula, D is the diameter of the butt welding elbow, and R is the radius of curvature. If there is no special instructions, the 1.5D elbow is generally used.
    (2) If divided by pressure level, there are about 17 kinds, which are the same as the American pipe standards, including: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80 , Sch100, Sch120, Sch140, Sch160, XXS, among which the most commonly used are STD and XS.
    (3) According to the angle of the elbow, there are 45-degree butt-welding elbows, 90-degree butt-welding elbows, 180-degree butt-welding elbows and other elbows with different angles.
    (4) Materials are: carbon steel, alloy steel and stainless steel.
     

     
    Application
    Large-diameter butt-weld elbows are mainly used to connect two sections of pipes with different end radius, or for pipe diameter reduction. This type of elbow generally needs to be produced according to specific engineering requirements or specific drawings. In addition to meeting the requirements of pipeline caliber, the specific conditions of the pipeline must also be considered, such as pipeline transportation pressure, fluid viscosity, abrasion, corrosion, fluid transportation Various factors such as temperature. Welding elbows are usually welded at the pipeline construction site. This is due to the different welding standards for various types of pipelines. It is necessary to perform on-site welding according to the pipeline weld seam level.
     

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