Magnetic Particle Testing (MT)
Magnetic Particle Testing (MT)
Magnetic Particle Testing (MT) is a highly effective non-destructive testing method used to detect surface and near-surface discontinuities in ferromagnetic materials. At Assessfie, our MT inspections accurately identify defects such as cracks, laps, seams, lack of fusion, and fatigue-related flaws that could compromise structural integrity. Using certified personnel, calibrated equipment, and standardized procedures, we deliver reliable inspection results for safety-critical components without damaging the asset.
How Magnetic Particle Testing Works
- The test component is magnetized using either a yoke, coil, or current flow technique.
- Magnetic particles (dry powder or wet suspension) are applied to the surface.
- Surface or near-surface defects cause magnetic flux leakage, attracting particles to form visible indications.
- Certified MT inspectors evaluate the indications against acceptance criteria and issue a clear inspection report with findings and recommendations.
Technologies We Use
- Yoke Magnetization (AC & DC)
- Prod Technique
- Coil / Central Conductor Technique
- Dry Magnetic Particle Testing
- Wet Fluorescent Magnetic Particle Testing
- Residual and Continuous Magnetization Methods
- Portable MT equipment for site and offshore inspections
Magnetic Particle Testing Applications in the Oil & Gas Industry
Magnetic Particle Testing plays a vital role across upstream, midstream, and downstream operations by detecting early-stage defects that can lead to failures. Common applications we support include:
Pipeline Weld Inspection — Detection of surface cracks in girth welds and tie-in welds
Pressure Vessels & Storage Tanks — Inspection of nozzles, attachments, and shell welds
Structural Steel & Fabrication — Beams, frames, brackets, and load-bearing members
Valves, Flanges & Fittings — Surface crack detection in forged and cast components
Offshore & Marine Structures — Welded joints in jackets, decks, and support structures
Heat Exchangers & Boilers — Weld toes, supports, and attachment points
Maintenance & Shutdown Inspections — Detection of fatigue cracks and service-induced damage
Weld Repair Verification — Confirmation of defect removal after grinding or repair welding
Standards & Regulations
Our Magnetic Particle Testing services strictly comply with international codes, industry best practices, and personnel qualification standards to ensure accuracy, repeatability, and global acceptance.
International Standards
- ISO 9934-1 — General principles for magnetic particle testing
- ISO 9934-2 — Detection media (dry and wet particles)
- ISO 9934-3 — Equipment requirements
ASTM Standards
- ASTM E709 — Guide for magnetic particle testing
- ASTM E1444 / E1444M — Standard practice for magnetic particle testing
- ASTM A275 / A275M — Magnetic particle examination of steel forgings
Industry-Specific Standards
- API 1104 — Welding of pipelines and related facilities
- API 650 — Weld inspection for welded tanks for oil storage
- API 570 — In-service piping inspection
- ASME Section V — NDT requirements for pressure equipment
Personnel Qualification Standard
- SNT-TC-1A — Qualification and certification of NDT personnel
