The in-line inspection of pipelines has been the domain of magnetic flux leakage (MFL) tools for half a century; however, there are many pipelines that cannot be inspected with MFL or Ultrasonic tools. Internal scale, tubercles and deposits in water and sewer pipes; lined pipelines (cement, HDPE, epoxy etc.), low-flow conditions in oil pipelines; elbows and pipes with multiple diameters can be insurmountable challenges for MFL tools.
For the past decade, Remote Field Technology (RFT) has been increasingly applied in these challenging conditions with good success.
We specialize in deploying RFT for in-line inspection of unpiggable pipelines. RFT tools may be used in a tethered mode (useful for distances up to 3 km) or in a free-swimming mode (distances up to 30 km), in all sizes of pipelines with wall thickness up to 16mm (steel) and 30mm (cast-iron). RFT tools have been developed for many different pipeline sizes and materials. Lines as small as 50mm and as large as 1981mm have been successfully inspected.
Note: the inspection and "direct condition assessment" of water and waste water mains is offered by Russell through its subsidiary:
PICA: Pipeline Inspection and Condition Analysis Corp. for more info: www.picacorp.com, or call (780) 468-6800