In-Line ERW Tubes (EMAT)

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TEMATE BW-LT(ERW) is an automated system for ERW inspection of longitudinal welds in ERW tubes. The couplant-free EMAT technique permits inspection immediately after welding and reliable detection of all API ERW defects and poor ID scarfing.


  • Non-contact EMAT technique.
  • In-line & fully automated.
  • Inspection Immediately After Welding.
  • Meets All API Standards.
  • Real Time Process Control.

General Specifications

Materials Inspected

  • Carbon Steel Tube and Castings (all API carbon steel grades).
  • Diameter: 60.33mm (2.375”) to 406mm (16”). Consult with Innerspec for other diameters.
  • Thicknesses Range: 5mm (0.188”) to 16mm (0.623”). Consult with Innerspec for other diameters.
  • Provides inspection of ID, OD and mid-weld.
  • For inspection, the pipe should be secured by pinch rollers separated by ~2m (7’) and be relatively straight and level.

Defect Detection

  • ½” / 1” (12.7 mm/25.4 mm) N10 and N5, ID and OD longitudinal notches.
  • 1/16” (1.6 mm) through drilled hole(TDH).
  • Hook cracks, pinholes, mismatch, skelp burrs, poor scarfing (OD & ID) and point defects such as inclusions and penetrators not easily detected with conventional systems.
  • Meets all API Standards and the most stringent oil company requirements.

Inspection Technique

  • Multi-mode shear wave technique in pulse-echo and pitch-catch configuration with sensors on both sides of the weld.
  • Sensors located offset from the weld seam avoiding direct heat from the weld. Permits up to 6mm (0.25”) of weld wander without reducing sensitivity.
  • Maximum sample rate of 2000 pulses per second for inspection speed of 1m/s.


  • Sensor:
    – Two sensor assemblies (one on each side of the weld) with independent air cooling.
    – Each sensor assembly includes an electromagnet and two EMAT RF Coil circuits.
  • Data Acquisition Cabinet: Enclosure is 24” (610mm) W x 32.3” (820 MM) L x 69” (1750 mm) H, weighing 500 lbs (225 Kgs).