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Centralizer Instrument (ECTL) The Centralizer Instrument (ECTL) runs in conjunction with instruments such as the Acoustic logging to provide centralization in the borehole.

The ECTL consists of a central mandrel with integral upper tool joint, four bow spring arms with replaceable wear plates, adjustable tension springs, and a lower sub

The material of centralizer mandrel is 17-4 P.H. Stainless Steel. At the upper end the tool joint incorporates a SPLIT COLLAR fabricated from Aluminum Bronze.

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