Induction Bending Bends/ Spools

Principal of Induction Bending:

Induction bending uses the principal of Induction to locally heat a pipe. This results in a narrow heat band on the pipe. The heated material is shaped into a bend in a narrow zone as the pipe is pushed by a precise drive system in a heavy frame. The bend part is then cooled by water/air to make the bend shape. The bending process is continuous and automated.

Salient Features

Why Induction Bending:

Improved Quality
  • Precise dimensional controls and accuracy (radius, angle, ovality, wall thinning)
  • Uniform hardness
  • Better surface finish (no pipe wrinkles)
Processing Flexibility
  • A wide range of material like carbon steel/alloy steel/stainless steel can be bend
  • Multiple bends can be produced
  • Precise customized pipe bends can be made
Time Saving

Induction bending does not require any sand filling or insertion of inner mandrels, bending time is considerably lesser.

Integrity of pipe work

Induction bends are piggable and reduce the need of welding for many applications.

Application of Induction Bends

  • Off shore
  • On shore
  • Petrochemical
  • Ship building
  • Refineries
  • Pumping stations
  • Nuclear power
  • Infrastructure

Types of Material

Induction Bends from Different Materials:

  • Carbon Steel Pipes (API 5L Gr.B/ASTM A106 Gr.B)
  • High Strength Steel Pipes (API 5L X42 to X80)
  • Low Temperature Alloy Steel (ASTM A333 Gr.6)
  • Stainless Steel Pipes (ASTM A312, 304L, 316L, etc)
  • Duplex & Super duplex Steel, including 22% Cr (UNS S31803) & 25% Cr (UNS S32750/60)
  • High Chrome Steel Pipes (ASTM A335, P11, P22, P91)
  • High Nickel High Chrome Steel Pipes (Inconel, Hastealloy)
  • Cladded Pipes
  • Tubes & Pipes (Seamless/ERW/LSAW/HSAW)

Manufacturing of Induction Bending

Particulars Machine No. 1 Machine No. 2
Pipe Diameter 4” – 24” 16” – 48”
Pipe Thickness Upto 30 mm Upto 40 mm
Bending Radius 2D – 8D ( Max. R =4877 mm) 2D – 8D ( Max. R =9754 mm)
Bending Angle 0° – 90° 0° – 90°
Angle Tolerance ± 0.5° ± 0.5°
Radius Tolerance ≤ 5 mm ≤ 5mm
Ovality At Ends ± 1% ± 1%
Ovality on Body 4D & above to 6% 4D & above to 6%
Wall Thinning 4D & above ≤ 8% 4D & above ≤ 8%

Testing & Inspection

Ratnamani has the full-fledged in house facility for following testing

  • Mechanical testing
  • Universal Testing Machine
  • Charpy Testing
  • Hardness Tester
  • Hydro testing
  • Beveling machine
  • Thickness gauge
  • Non-destructive testing ( X-ray/UTI/MPI )
  • Microscope for metallographic analysis
  • Spectrometer for chemical analysis
  • Corrosion testing
  • Hydrogen-induced cracking (HIC)
  • Sulfide stress corrosion cracking (SSCC)

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