Elbow

Short Description:


  • Keywords(pipe type): 45 Degree,90 Degree,180 Degree Elbow,Long Radius,Short Radius Elbow
  • Size: NPS: 1/2''~24''(Seamless), 24''~72''(Welded);DN: 15~1200, WT: 2~80mm, SCH 5~XXS
  • Bending Radius: R=1D~10D, R=15D, R=20D
  • Material & Standard: Carbon Steel --- ASME B16.9, ASTM A234 WPB Stainless Steel --- ASTM A403 304/304L/310/310S/316/316L/317L/321 ;Alloy Steel --- ASTM A234 WP1/5/9/11/12/22/91
  • Ends : Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
  • Delivery: Within 30 days and Depends on your order quantity
  • Payment: TT, LC , OA , D/P
  • Packing: Packed in Wood Cabins/Wood Tray
  • Usage: For conveying gas, water and oil either in the oil or natural gas industries
  • Description

    Specification

    Standard

    Painting & Coating

    Packing & Loading

    Seamless Elbow Manufacturing Process (Heat Bending & Cold Bending)

    One of the most common methods for manufacturing elbows is using hot mandrel bending from straight steel pipes. After heating the steel pipe at a elevated temperature, the pipe is pushed, expanded, bended by the inner tools of mandrel step by step. Applying hot mandrel bending can manufacture a wide size range seamless elbow. The characteristics of mandrel bending are strongely depend on the intergrated shape and dimensions of the mandrel. The using advantages of hot bending elbows include smaller thickness deviation and stronger bending radius than other bending methond type. Meanwhile, using bending instead of prefabricated bends substantially reduces the number of welds needed. This reduces the amount of work required and increases the quality and usability of pipes. However, cold bending is the process to bent the straight steel pipe at normal temperatures in a bending machine. Cold bending is suitable for pipes with an outer diameter of 17.0 to 219.1 mm, and wall thickness 2.0 to 28.0 mm. The recommended bending radius is 2.5 x Do. Normally at a bending radius of 40D. By using cold bending, we can get small radius elbows, but we need to pack the internals with sand to prevent wrinkling. Cold bending is a quick and inexpensive bending method. It is a competitive option for making pipelines and machine parts.

    Welded Elbow Manufacturing Process (Small & Large)

    Welded elbows are made from the steel plates, so it is not seamless steel elbows. Use a mould and press the steel plate to the shape of the elbow, then weld the seam to be a finish steel elbow. It is the old production method of the elbows.  Recent years the small sizes elbows are almost manufactured from the steel pipes now. For the big size elbows, for example, it is very difficult to produce elbows over 36” OD from the steel pipes . So it is commonly made from the steel plates,  pressing the plate to the shape of half elbow, and welding the two halves together.  Since the elbows are welded in its body , the inspection of the welding joint is necessary . Commonly we use the X-Ray inspection as the NDT.

    Elbow-01


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  • Nominal pipe size

    Outside Diameter
    at Bevel

    Center to End

    Center to Center

    Back to Faces

    45°Elbows

    90°Elbows

    180°Return

    H

    F

    P

    K

    DN

    INCH

    Series A

    Series B

    LR

    LR

    SR

    LR

    SR

    LR

    SR

    15

    1/2

    21.3

    18

    16

    38

    -

    76

    -

    48

    -

    20

    3/4

    26.9

    25

    16

    38

    -

    76

    -

    51

    -

    25

    1

    33.7

    32

    16

    38

    25

    76

    51

    56

    41

    32

    11/4

    42.4

    38

    20

    48

    32

    95

    64

    70

    52

    40

    11/2

    48.3

    45

    24

    57

    38

    114

    76

    83

    62

    50

    2

    60.3

    57

    32

    76

    51

    152

    102

    106

    81

    65

    21/2

    76.1(73)

    76

    40

    95

    64

    191

    127

    132

    100

    80

    3

    88.9

    89

    47

    114

    76

    229

    152

    159

    121

    90

    31/2

    101.6

    -

    55

    133

    89

    267

    178

    184

    140

    100

    4

    114.3

    108

    63

    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

    126

    305

    203

    610

    406

    414

    313

    250

    10

    273.0

    273

    158

    381

    254

    762

    508

    518

    391

    300

    12

    323.9

    325

    189

    457

    305

    914

    610

    619

    467

    350

    14

    355.6

    377

    221

    533

    356

    1067

    711

    711

    533

    400

    16

    406.4

    426

    253

    610

    406

    1219

    813

    813

    610

    450

    18

    457.2

    478

    284

    686

    457

    1372

    914

    914

    686

    500

    20

    508.0

    529

    316

    762

    508

    1524

    1016

    1016

    762

    550

    22

    559

    -

    347

    838

    559

    Note:
    1. Do not use the figures in the parenthesis as far as possible
    2. Please first select A series.

    600

    24

    610

    630

    379

    914

    610

    650

    26

    660

    -

    410

    991

    660

    700

    28

    711

    720

    442

    1067

    711

    750

    30

    762

    -

    473

    1143

    762

    800

    32

    813

    820

    505

    1219

    813

    850

    34

    864

    -

    537

    1295

    864

    900

    36

    914

    920

    568

    1372

    914

    950

    38

    965

    -

    600

    1448

    965

    1000

    40

    1016

    1020

    631

    1524

    1016

    1050

    42

    1067

    -

    663

    1600

    1067

    1100

    44

    1118

    1120

    694

    1676

    1118

    1150

    46

    1168

    -

    726

    1753

    1168

    1200

    48

    1220

    1220

    758

    1829

    1219

     

    ASTM A234

    This specification covers wrought carbon steel & alloy steel fittings of seamless and welded construction. Unless seamless or welded construction is specified in order, either may be furnished at the option of the supplier. All welded construction fittings as per this standard are supplied with 100% radiography. Under ASTM A234, several grades are available depending upon chemical composition. Selection would depend upon pipe material connected to these fittings.

    Tensile Requirements

    WPB

    WPC, WP11CL2

    WP11CL1

     WP11CL3

    Tensile Strength, min, ksi[MPa] 60-85 70-95 60-85  75-100
    (0.2% offset or 0.5% extension-under-load) [415-585] [485-655] [415-585]  [520-690]
    Yield Strength, min, ksi[MPa] 32 40 30 45
    [240] [275] [205] [310]

    Some of the grades available under this specification and corresponding connected pipe material specification are listed below:

    Elbow-05

    ASTM A403

    This specification covers two general classes, WP & CR, of wrought austenitic stainless steel fittings of seamless and welded construction.
    Class WP fittings are manufactured to the requirements of ASME B16.9 & ASME B16.28 and are subdivided into three subclasses as follows:

    • WP – SManufactured from seamless product by a seamless method of manufacture.
    • WP – W These fittings contain welds and all welds made by the fitting manufacturer including starting pipe weld if the pipe was welded with the addition of filler material are radiographed. However no radiography is done for the starting pipe weld if the pipe was welded without the addition of filler material.
    • WP-WX These fittings contain welds and all welds whether made by the fitting manufacturer or by the starting material manufacturer are radiographed.

    Class CR fittings are manufactured to the requirements of MSS-SP-43 and do not require non-destructive examination.

    Under ASTM A403 several grades are available depending upon chemical composition. Selection would depend upon pipe material connected to these fittings. Some of the grades available under this specification and corresponding connected pipe material specification are listed below:

    Elbow-06

    ASTM A420

    This specification covers wrought carbon steel and alloy steel fittings of seamless & welded construction intended for use at low temperatures. It covers four grades WPL6, WPL9, WPL3 & WPL8 depending upon chemical composition. Fittings WPL6 are impact tested at temp – 50° C, WPL9 at -75° C, WPL3 at -100° C and WPL8 at -195° C temperature.

    The allowable pressure ratings for fittings may be calculated as for straight seamless pipe in accordance with the rules established in the applicable section of ASME B31.3.

    The pipe wall thickness and material type shall be that with which the fittings have been ordered to be used, their identity on the fittings is in lieu of pressure rating markings.

    Steel No.

    Type

    Chemical composition

    C

    Si

    S

    P

    Mn

    Cr

    Ni

    Mo

    Other

    ób

    ós

    δ5

    HB

    WPL6 0.3 0.15-0.3 0.04 0.035 0.6-1.35 0.3 0.4 0.12 Cb:0.02;V:0.08 415-585 240 22
    WPL9 0.2 0.03 0.03 0.4-1.06 1.6-2.24 435-610 315 20
    WPL3 0.2 0.13-0.37 0.05 0.05 0.31-0.64 3.2-3.8 450-620 240 22
    WPL8 0.13 0.13-0.37 0.03 0.03 0.9 8.4-9.6 690-865 515 16

     Light Oiling, Black Painting, Galvanizing, PE /3PE Anti-corrosion Coating

    Packed in Wood Cabins/Wood Tray

    Elbow-07

    Elbow-09 Elbow-08