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Buttweld Pipe Bends

Pipe Bends : Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

Top ASME B16.9 1D, 1.5D, 2D, 3D, 5D, 8D, 10D Pipe Bend Manufacturer & Exporter – Delivering High-Quality Stainless Steel, Carbon Steel, Alloy Steel, and High Nickel Alloy Pipe Bends (Seamless & Welded, SCH 40 / SCH 80) to the UK, Canada, Singapore, Saudi Arabia, and Brazil.

buttweld pipe bends suppliers

Best Export Prices: sales@midlandforgefittings.com

At Midland Forge and Fittings Pvt. Ltd., we take pride in being a trusted name in the manufacturing of high-quality pipe bends for diverse industrial applications. With years of expertise, advanced technology, and a strong commitment to excellence, we deliver precision-engineered bends that ensure smooth fluid flow, reduce pressure drop, and enhance the durability of piping systems. 

We manufacture a wide range of carbon, stainless, and alloy steel pipe bends that comply with global standards such as ASME, ANSI, DIN, and EN. Whether it’s long radius bends, short radius bends, 3D, 5D, or 10D bends, our products are built to withstand extreme temperatures, pressures, and corrosive environments. Each bend undergoes strict quality checks to ensure optimum performance, making us a reliable partner for the oil and gas, petrochemical, power generation, and water treatment industries.

Pipe bends are precision-engineered components used to change the direction of piping systems while maintaining smooth flow characteristics and minimizing pressure loss. Manufactured to meet international standards such as ASME, ANSI, DIN, and ISO, our pipe bends are available in a variety of radii including short radius (SR), long radius (LR), and custom bends up to 10D or more. Each bend undergoes rigorous quality control and non-destructive testing (NDT) to guarantee dimensional accuracy, superior surface finish, and compliance with client specifications.

ASME B16.9 Pipe Bends Fittings

Long Radius (LR) Bends Specifications, Sizes & Standards

Size Range – Seamless

½″ NB to 24″ NB (DN15 to DN600)

Wall Thickness

SCH 10S, SCH 20, SCH 40/40S, SCH 60, SCH 80/80S, SCH 100, SCH 120, SCH 140, SCH 160, SCH XXS

Marking

Grade, Size, Schedule, Heat No., Standard, Manufacturer Name

Fitting Types

1D, 1.5D, 2D, 3D, 5D, 10D bends, long radius (LR) bends, short radius (SR) bends, miter bends, and hot induction bends

Size Range – Welded

½″ NB to 48″ NB (DN15 to DN1200)

Ends Connection

Beveled Ends as per ASME B16.25 (for butt welding)

Manufacturing Standards

ASME B16.9, ASME B16.28, MSS SP-43 (for SS light fittings), MSS SP-75 (for large diameter high-strength)

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Size Range – Fabricated

Above 24″ NB (DN600) as per drawing / custom requirement

Dimensional Standards

ANSI/ASME B36.10 (CS) & B36.19 (SS) for pipe schedules

Testing

Hydrostatic Test, Visual Inspection, Radiography (RT), Ultrasonic (UT), PMI, Third Party Inspection (BV, SGS, TUV)

Surface Finish

Pickled & Passivated (SS), Black (CS), Sandblasted or as required
ASME B16.9 / MSS-SP-43 Short Radius (SR) Bends

Buttweld Pipe Bends – Materials, Grades & Standards

Material Category Grade Standards (ASTM / ASME) Typical Use/Application
Stainless Steel 304 / 304L / 304H ASTM A403 WP304/304L/304H General purpose, corrosion resistance
316 / 316L / 316HASTM A403 WP316/316L/316HMarine & chemical applications
317 / 317LASTM A403 WP317/317LHigh corrosion resistance
321 / 321HASTM A403 WP321/321HHigh temperature, stabilized
347 / 347HASTM A403 WP347/347HHigh-temp pressure systems
904LASTM A403 WP904L / B625Acid handling, sulfuric environments
254 SMOASTM A403 / B366High chloride environments
Carbon Steel A234 WPB / WPC ASTM A234 Pressure piping & general piping systems
A420 WPL6ASTM A420Low temperature services
Alloy Steel A234 WP1 / WP5 / WP9 ASTM A234 High-temp & pressure pipelines
A234 WP11 / WP22ASTM A234Steam lines & refineries
A234 WP91ASTM A234Power generation, high performance
Duplex Steel UNS S31803 / S32205 ASTM A815 / A790 Corrosion & high strength use
Super Duplex Steel UNS S32750 / S32760 ASTM A815 / A790 Offshore, seawater applications
Nickel Alloys Nickel 200 / 201 ASTM B366 / B162 Alkali & chemical processing
Inconel 600 / 625 / 718ASTM B366Heat exchangers, aerospace
Incoloy 800 / 825ASTM B366Petrochemical & chemical processing
Hastelloy C22 / C276ASTM B366Severe corrosion resistance
Monel 400 / K500ASTM B366Seawater, chemical industries
Alloy 20ASTM B366Sulfuric acid services
Nimonic 75 / 80AASTM B366 / B637High-temp applications
Copper Nickel Cu-Ni 90/10 / 70/30 ASTM B466 / B467 Marine systems, seawater service
Titanium Grade 2 / Grade 5 ASTM B363 Lightweight, corrosion resistance
Aluminium 6061 / 5083 ASTM B361 Low-pressure, non-corrosive piping
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Dimensions of Buttweld Pipe Bends

Dimensions of ASME B16.9 Buttweld Pipe Bends
Nominal Pipe Size (NPS) Outside Diameter (D) mm Wall Thickness Range (mm) 3D Bend Center-to-Center (CLR) mm 5D Bend CLR mm 8D Bend CLR mm 10D Bend CLR mm
1/2″ 21.3 2.77 – 3.73 64 106 170 213
3/4″ 26.7 2.87 – 3.91 80 134 214 267
1″ 33.4 3.38 – 4.55 100 167 267 334
1 1/4″ 42.2 3.56 – 4.85 127 211 338 422
1 1/2″ 48.3 3.68 – 5.08 144 241 386 483
2″ 60.3 3.91 – 5.54 178 298 478 603
2 1/2″ 73.0 5.16 – 7.01 219 365 584 730
3″ 88.9 5.49 – 7.62 267 445 711 889
4″ 114.3 6.02 – 8.56 343 572 914 1143
5″ 141.3 6.55 – 9.53 432 720 1146 1413
6″ 168.3 7.11 – 10.97 508 847 1350 1683
8″ 219.1 8.18 – 12.70 660 1100 1760 2191
10″ 273.0 9.27 – 12.70 820 1365 2184 2730
12″ 323.9 9.53 – 12.70 975 1620 2591 3239
14″ 355.6 9.53 – 12.70 1067 1778 2845 3556
16″ 406.4 9.53 – 12.70 1219 2032 3245 4064
18″ 457.0 9.53 – 12.70 1372 2285 3656 4570
20″ 508.0 9.53 – 12.70 1524 2540 4064 5080
24″ 610.0 9.53 – 12.70 1829 3048 4877 6100

Weight Chart: ASME B16.9 Pipe Bend (SCH 40 / STD)

NPS (inches) 90° LR (Sch Std) kg 90° SR (Sch Std) kg 45° LR (Sch Std) kg 180° LR (Sch Std) kg
½″ 0.18 0.14 0.09 0.36
¾″ 0.19 0.15 0.10 0.38
1″ 0.40 0.31 0.21 0.80
1¼″ 0.60 0.47 0.32 1.20
1½″ 0.90 0.70 0.48 1.80
2″ 1.60 1.26 0.85 3.20
2½″ 3.25 2.55 1.72 6.50
3″ 5.00 3.90 2.63 10.00
3½″ 6.75 5.26 3.55 13.50
4″ 9.00 7.00 4.73 18.00
5″ 15.00 11.67 7.88 30.00
6″ 24.50 19.05 12.85 49.00
8″ 50.00 38.75 26.25 100.00
10″ 88.00 68.20 46.20 176.00
12″ 125.00 96.88 65.63 250.00
14″ 160.00 124.00 83.00 320.00
16″ 206.00 159.00 106.00 412.00
18″ 260.00 201.00 134.00 520.00
20″ 320.00 248.00 165.00 640.00
22″ 394.00 305.00 203.00 788.00
24″ 460.00 356.00 237.00 920.00

Hot Induction Bends, U-Bends Tolerances as per ASME B16.9

Fitting TypeParameterTolerance
Up to 4” NPSAbove 4” NPS
Pipe BendsOutside Diameter at Bevel±1.6 mm (1/16″)±1.6 mm (1/16″)
Center-to-End (A, B)±1.6 mm (1/16″)±3.2 mm (1/8″)
Wall Thickness-12.5% (no positive tolerance)
OvalityShall not exceed 1% of specified OD
How are pipe bends tested for quality?

Pipe bends are critical components in piping systems, and their quality directly affects system integrity. Common testing methods include:

  1. Dimensional Inspection:

    • Ensures the bend meets specified radius, angle, and wall thickness.
    • Tools like calipers, radius gauges, and templates are used for verification.

  2. Hydrostatic Testing:

    • The bend is filled with water or another incompressible fluid and pressurized above its operating pressure.
    • Detects leaks, weak welds, or material flaws.

  3. Non-Destructive Testing (NDT):

    • Radiographic Testing (RT): Uses X-rays or gamma rays to detect internal defects such as voids or incomplete fusion.
    • Ultrasonic Testing (UT): High-frequency sound waves identify internal discontinuities and measure wall thickness.
    • Magnetic Particle Testing (MPT/MT): Detects surface and near-surface cracks in ferromagnetic materials.
    • Dye Penetrant Testing (DPT/PT): Reveals surface cracks and porosity in non-porous metals.

  4. Material Verification:

    • Confirms chemical composition and mechanical properties through Mill Test Reports (MTRs) or Positive Material Identification (PMI).

  5. Weld Examination (for welded bends):

    • Checks weld profile, penetration, and alignment.
    • Often involves a combination of visual, radiographic, or ultrasonic inspection.
1. Hot Induction Bending
  • Process: The pipe is heated locally using an induction coil, making the steel pliable. A bending machine then gradually bends the heated section to the desired radius.
  • Advantages:
    • Produces precise bends with smooth curvature.
    • Maintains wall thickness and avoids wrinkles.
    • Suitable for large-diameter or thick-walled pipes.
  • Applications: Oil & gas pipelines, refineries, power plants.
2. Cold Bending
  • Process: The pipe is bent at room temperature using mechanical force, often with a rolling or pressing machine.
  • Advantages:
    • Cost-effective for small-diameter pipes.
    • No heat treatment required.
  • Limitations:
    • Higher risk of wall thinning or deformation.
    • Limited to larger bend radii and thinner pipes.
  • Applications: Water pipelines, HVAC systems, low-pressure applications.
3. Mandrel Bending
  • Process: A mandrel (a flexible or segmented internal support) is inserted inside the pipe to prevent collapse while bending.
  • Advantages:
    • Maintains uniform wall thickness.
    • Produces tight-radius bends without wrinkling.
  • Applications: Automotive, aerospace, and process piping requiring precise bends.
4. Miter Bending
  • Process: Pipes are cut into sections at specific angles (miters) and then welded together to form the bend.
  • Advantages:
    • Can achieve very tight angles.
    • Useful for oversized or heavy pipes.
  • Limitations:
    • Welded joints may require inspection and reinforcement.
    • Less smooth flow compared to continuous bends.
  • Applications: Large-diameter pipelines, structural piping.

The bend radius of a pipe significantly affects fluid flow, pressure drop, and the overall efficiency of a piping system. Selecting the correct radius requires considering flow requirements, pipe size, material, and available space.

1. Larger Radius Bends:

A larger bend radius allows the fluid to turn gradually, reducing turbulence and minimizing pressure losses. This is especially important for:

  • High-flow systems where smooth flow is critical.
  • Applications in petrochemical, chemical processing, and power plants.
  • Pipes carrying abrasive or erosive fluids, as smoother bends reduce wear and extend component life.
2. Smaller/Shorter Radius Bends:

Sometimes space constraints force the use of smaller radii. While practical, short-radius bends can:

  • Increase turbulence, vibration, and noise.
  • Cause higher pressure drops, possibly requiring additional pumping power.
  • Accelerate localized erosion in high-velocity flows. These bends are suitable for compact layouts, HVAC systems, or structural piping where space is limited.
3. Material and Pipe Diameter Considerations:

The choice of bend radius must account for pipe diameter and material properties:

  • Larger-diameter pipes often need proportionally larger radii to avoid wall thinning or deformation.
  • Rigid materials may require gentler curves to prevent cracking, while flexible materials like stainless steel or copper can tolerate tighter bends.
4. Industry Recommendations:

Bend radius is often defined as a multiple of the pipe diameter (D):

  • Standard radius: 1.5D to 3D for general applications.
  • Long radius: 5D or more for high-flow or critical systems.
  • Short radius: around 1D or less only when space constraints and system requirements allow.
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