What is MFL pigging?

MFL ILI PIGs use powerful magnets to magnetize the pipe wall. Tri axial hall sensors positioned between the magnetic poles then measure flux leakage originating from anomalies.

What is a MFL tool in pipeline?

Magnetic Flux Leakage (MFL) testing is a widely used, Non-Destructive Testing (NDT) method for the detection of corrosion and pitting in steel structures. MFL is often used for integrity assessment of pipelines and storage tanks, but the principle can be applied to assets in any industrial sector.

What is used in MFL PIGs to measure thickness in pipeline?

A magnetic flux leakage inspection pig uses magnetism to detect changes in the thickness of the pipe wall (see Figure 1). The pipe wall is magnetised using a strong magnet. Any metal-loss in the pipe wall will cause the induced magnetic field to change.

What are inline inspection tools?

In-line inspection (ILI) “tools”, referred to as “intelligent” Pipeline Integrity Gauges (PIG’s) or “smart” PIG’s, carry a variety of sensors to inspect pipelines for internal and external corrosion, geometric deformation, lamination, cracks, and other defects.

How does a pig move in a pipeline?

The pipeline pigs (the projectiles that travel along the pipes or tubes to transfer residual product) are solid objects with no moving parts. They are unable to propel themselves, so instead are propelled along the pipes or tubing by a liquid or a gas.

What is MFL inspection?

Magnetic flux leakage (MFL) is a magnetic method of non-destructive testing that is used to detect corrosion, pitting and wall loss in steel structures. Magnetic flux leakage (MFL) is commonly used for inspecting tank floors in the petrochemical industry.

What is magnetic particle inspection used for?

Magnetic Particle Inspection (MPI) is a non-destructive testing method that can detect surface and subsurface flaws in ferromagnetic materials. Magnetic particle inspection is often carried out to help determine an item’s fitness for use or conformity.

What is an ILI tool?

Sophisticated and sensitive in-line inspection (ILI) tools travel through the pipe and measure and record irregularities that may represent corrosion, cracks, laminations, deformations (dents, gouges, etc.), or other defects.

What are the different type of inspection?

Types of inspection and methods of quality control inspections differ for a reason so it’s good to know the details.

  • Sample Checking.
  • Pre-Production Inspections (PPI)
  • During Production Inspection (DPI)
  • Pre-Shipment Inspection (PSI)
  • Piece by Piece Inspection (or Sorting Inspection)
  • Metal Detection.

What is an oilfield pig?

1. n. [Production Testing] A device with blades or brushes inserted in a pipeline for cleaning purposes. The pressure of the oil stream behind pushes the pig along the pipeline to clean out rust, wax, scale and debris. These devices are also called scrapers.