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ELECTRO MAGNETIC INSPECTION
(EMI)
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Arctic Pipe Inspection's Electromagnetic Inspection Unit
(EMI) utilizes the finest and latest developments of electro-magnetic, gamma
ray, and eddy current detection devices, combined with automation, to offer
fast, sure and cost efficient pipe inspection. The pipe is subjected to five
electronic inspection functions with just one pass through the unit.
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Plant 3500 EMI unit inspects tubes up to 3-1/2" in
diameter
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Plant 6000 EMI unit inspects tubes
up to 13-3/8" in diameter
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The inspection is performed as follows:
1. Wall thickness variations are detected by means of gamma ray source
applied the length of the pipe. This assures accurate wall thickness
measurement as well as eccentricity detection.
2. Detection and locating defects is achieved through the transverse
magnetic energizing of each length of pipe. Defects of longitudinal origin
are sensed by rotating scanner as flux variations.
3. Grade verifications utilize an electronic comparison of the length being
inspected to a length of pipe with a known standard grade.
4. Detecting and locating transverse defects id performed as the entire
length is conveyed through the ROBCO V detection system where it is scanned
for variations in magnetic field caused by both internal and external
defects having a transverse dimension. Transducers, which are sensitive to
these flux variations caused by defects, are positioned around the pipe so
as that complete coverage is obtained.
5. Demagnetization of the entire length occurs as the final function of the
ROBCO v unit.
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