Phased Array Ultrasonic Testing (PAUT) is an Advanced NDT technique that employs a set of ultrasonic testing (UT) probes comprised of small conventional transducer elements. Each transducer can be
Remote Field Electromagnetic Inspection
The Remote Field Eddy Current (RFET) is a variation of Eddy Current send-receive probe technique. RFET technique allows the use of the differential- and absolute mode This technique is capable for the detection of localized defects with the differential mode and gradual defects with the absolute mode The detector coils are separated by a distance equivalent to two or three times the tube diameter. The receiving coils sense the flux lines that cross the tube wall twice Remote field has an equal sensitivity to internal and external indications while the phase shift is directly proportional to wall loss.
Advantages of Remote Field Electromagnetic Testing
Up to 500 tubes of 6 meters length can be inspected in 12 hrs.
Can inspect ferromagnetic tubes up to 3.5 inches in diameter with 0.125 inches wall thickness.
Inspection speed (up to approx. 40 feet per minute).
Can detect large-area discontinuities such as steam erosion and baffle wear.
Amplitude changes in the signals sensed are not speed sensitive.
Flexible probes can be used to inspect and travel through U-bend areas..
Permanent records can be obtained on test results.
Limitations of Remote Field Electromagnetic Testing
Limitation to distinguishing ID from OD defects..
Evaluation of small flaws such as pits can be difficult..
Instrumentation and test probes can be very expensive..
Tubes must be cleaned..
Inaccuracy in test results could occur if a discontinuity encountered differs in geometry from calibration discontinuities..
NFT technology uses two coils — a transmitter and a receiver. Typically, the receiver coil is close to the transmitter coil, taking advantage of the transmitter’s near-field zone —
MFL probes incorporate a magnetic detector placed between the poles of the magnet where it can detect the leakage field. During inspection, a magnetic circuit of sorts forms between the part and the
Tubes are found commonly in all the major sector like marine, industrial these are also asset for oil gas petroleum and other nuclear industries. Inspection of heat exchanges is crucial as it
Remote visual inspection is a non-destructive testing technique that employs the use of remotely operated cameras and crawlers in order to assess the integrity of components and infrastructure in
Internal Rotary Inspection System (IRIS) is used for inspection of tubes of heat exchangers and steam generators. The system displays circumferential cross section of tubes (wall thickness of tubes)
Long Range UT (LRUT)
Corrosion under insulationThere are certain sections of the pipelines like portions crossing under the road crossing/culverts, underground portion, where online inspection using