Sensors

Specifications of Magnetic Flux Leakage Sensors

General Metal Loss Sizing Specification Nominal Pipe Case Pipe
Depth at POD = 90% 0.10t 0.20t
Depth Accuracy (80% accuracy) ± 0.10t ± 0.20t
Width Accuracy (80% accuracy) ± .75 inches
± 20 mm
± 1 inches
± 25 mm
Length Accuracy (80% accuracy) ± . 5 inches
± 12 mm
± 0.75 inches
± 20 mm
  • t = wall thickness
  • Detection threshold and sizing accuracy in bends are unspecified
  • Detection threshold increases to 0.15t and depth sizing accuracy degrades to ±0.15t in seamless pipe
  • Depth sizing accuracy degrades to ±0.20t near girth welds or in heat affected zones

Specifications of Laser Deformation Sensors

Sizing Specification Dent Case Pipe
Depth at POD = 90% 1% of pipe nominal OD 1% of pipe nominal
Depth Accuracy (80% confidence) ± 1% of pipe nominal OD ± 1% of pipe nominal OD
Width Accuracy (80% confidence) ± 2 inches ± 50 mm
Length Accuracy (80% confidence) ± 1 inches ± 25 mm