Norsk Induksjonsrørbøying AS

Induction Bending

Factors:

Heating Speed Bending Temperature

Cooling Speed Mother Pipe Material Properties

Bending Machine:

Air-ringInductorQuench ring

PB450-18”Induction Bending Machine

PB400-16”Induction Bending Machine

Profiles:

All materials that can conduct electricity are bendable, almost regardless of the profile shape!

Induction bending gives you great freedom of choice:• Bending radius: Step-less from 60 mm to 22.000 mm• Bending angle: 0 to 300 degrees• Profile dimensions: max. 300 X 600 mm (width x

height).

Pipe dimensions from 16 mm to 457,2 mm (18”)

Ω – Spool reduced with8 welds and better flow

ExamplesOf cost reducing designs

Ex. 1. Traditional method, with welded standard pipes.6 welded joints

Ex. 2. Induction bends, with long straight ends.1 welded joint

Ex. 3. Induction spool.0 welding

Ex. 4. Induction bends, with long straight ends.2 welded joints

Heating Speed:

Bending Temperature/temperature tolerance

Material Grade Carbon material (870º – 930º)

Duplex / Super Duplex

(1050º – 1120º)

Mother pipe material certificates

Wall thickness

Induction coil

Cooling Speed:

Motherpipe Material Properties

Carbon steel / Stainless steel

Seamless / longitudinal welded

Weld cap (G48)

Segregation / Intermetallic phases in the middle of the plate thickness

Post Bend Heat Treatment (PBHT)

Heating of steel

Capacity: 3,5 tons

Temperature 580°C to 1150°C

Carbon steel - Tempering (SML 360 / 415) - Quenching and Tempering (SML 415 / 450) - Normalizing (SML 360)

Duplex / Superduplex - Wall thickness - Pipe manufacturer - Seamless / Seamwelded - Bending radius

PBHT – Increasing Cost - PBHT - PBHT Batch test - Blasting / Pickling - Single bends = more welds

• NORSOK M-630, • DNV OS-F101, • ISO 15590-1, • TR 2000• TR 1969• TR 1120• And a lot of other

specifications

Specifications:

How do we ensure the quality of the bends?

Mechanical Testing

1. Qualification Test2. Production Test3. Batch Test

Norsk Induksjonsrørbøying AS - NIRASBø Industriområde 23802 Bø i Telemarkniras@online.noTlf: (+47) 35 06 13 10Faks: (+47) 35 06 13 11

Contact Info:

Induction Bending