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Need
Status: Need is Open

Fully Automated Inspection of Girth Welds in Metallic Pipelines

Request Number

NG_2017_0006_N_022
Point of Contact
Description

Subsea 7 invites proposals from organisations and experts to provide a fully automated Non-Destructive Testing (NDT) analysis of pipeline welds. The proposed solution will determine the quality of the welds and provide automated feedback and decision making of the results against agreed acceptance values. Ideally, the inspection system would be fully automated or potentially compatible with robotic systems to minimise the operator interaction on the pipeline fabrication.

A two phased approach would be expected with both visual inspection of the weld surface and volumetric analysis of the underlying weld structure being vital to the quality control process.

The inspection system should have closed loop control with the welding system to enable real time optimisation of welding parameters based on inspection results in order to minimise the incidence of unacceptable flaws.

Background

Visual inspection of completed girth welds is currently performed by a qualified inspector

Volumetric inspection of pipeline welds during fabrication currently utilises Automatic Phased Array Ultrasonic Testing (PAUT). An array of  probes are attached to the outside of the pipe manually and move around the pipe circumference on a motorised scanning frame.

Two operators are required to supervise the rotating scanning frame and an additional skilled technician monitors and interprets the signals. Individual ultrasonic responses associated with weld flaws are accepted or rejected against pre-determined acceptance criterion.

The following characteristics should be considered in the final technology offering:

  • Suitable for fully automatic deployment
  • Suitable for in-situ pipeline fabrication inspection
  • Should not exceed critical production cycle times (3-20mins depending on pipe size and grade)
  • Required inspection equipment should be compact and non-intrusive as far as is practical
  • Required inspection procedure should not require special preparation of the pipe surfaces to be inspected

 

 

Typical girth weld surface for visual inspection

 

 

 

Typical weld through thickness section for volumetric inspection

Key success Criteria
  • Suitable for carbon steel, clad and Corrosion Resistant Alloy (CRA) metallic materials in wall thicknesses 6-45mm and diameters 150- 500mm.
  • Detect and size potential flaws >0.5mm in height.
  • Detect and size potential flaws >3mm in length.
  • Can detect both planar and volumetric flaws
Possible Approaches
  • Optical (Lasers / Cameras etc)
  • Ultrasonic
  • Hall effect
  • Magnetic Sensors
  • X-Ray
  • Radiowaves
  • Microwave
  • Vibration
  • Other non-destructive testing methods
Approaches not of Interest

Any systems that require offline inspection and analysis.

Due Date
Oct 29
Gallery Moderator(s)
Oliver Worsfold
Request Number
NG_2017_0006_N_022
Area of Interest