Leakage flux tube testing with ultra-high performance and reliability

The ROTOMAT and TRANSOMAT test systems by FOERSTER provide an economic solution for the automatic testing of ferromagnetic steel tubes (seamless or welded) for longitudinal and transverse defects using the dc-field leakage flux method. Ultra-high testing performance in terms of throughput, test sensitivity and reproducibility. The test results are ultra reliable thanks to the continuous monitoring of all functions relevant to testing.

Your advantages at a glance

  • Fully automatic testing with high throughput speeds up to 3 m/s
  • Ultra-high test sensitivity and reproducibility
  • Maximum reliability thanks to a robust design and comprehensive monitoring functions

Technical Data

Range of diameters: 20 mm - 520 mm
Range of wall thickness: 2 mm - 20 mm (thicker than 20 mm possible for exterior defect testing)
Tolerances: in accordance with API 5 CT, L and D
End consistency: serrated, non-serrated, or clinched ends, threaded or non-threaded
Test piece temperature: > 0 °C to 80 °C
Test speed: 0.3 m/s to 3 m/s (depending on external diameter and wall thickness)



Specifies the technical delivery conditions for steel tubes (housing, tubes, mechanical seals, and joint heads), coupling materials, and accessories. The requirements are also defined on three product specification levels (PSL-1, PSL-2, PSL-3).


Comprises specifications for seamless and welded steel tubes for pipelines in the crude oil and natural gas sector. The specifications of API 5L correspond to ISO 3183.


Specifies the technical delivery conditions for steel bore hole tubes with inverted tube ends and welded tool connections for drilling and production companies in the crude oil and natural gas sector.

DIN EN ISO 10893-3

Describes the method of the automated leakage flux testing of seamless and welded ferromagnetic steel tubes (except submerged arc welded tubes) across the entire tube circumference for detecting longitudinal and/or transverse imperfections.


Describes the method for testing ferromagnetic tube-shaped products using leakage flux.


Specifies the requirements for hot-molded seamless steel tubes.