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Brittleness Tests

Regarding your inquiry about brittleness tests for armor wire on used cables, Camesa does not have a specific test to determine when armor wire has acceptable or unacceptable brittleness in a used cable.   However, we can offer some suggestions and background information.

When Camesa manufactures logging cables, one of the tests of incoming wire is that the wire be capable of being wrapped around its own diameter 5 times without breaking or fracturing.  This is a severe test of brittleness for hard drawn steel wire.  The test is necessary because in the manufacturing process, the wire must go around a perform head which shapes the wire into a helix just before it goes over the core to form the armor layer.

Once the cable is made there is no requirement for the individual wires to undergo such a severe bend during normal operation.  With ' respect to bending, during normal operation the toughest requirement on the wire is that it be capable of acting without failure during the fabrication of the cablehead.

In many cable heading operations, a certain percentage of inner and outer armor wires are bent in a fairly sharp bend at the bottom of two wedges.  If the wire can be bent around the radius or diameter necessary to make up the cablehead properly, without have the wire crack or break, then our suggestion would be that the wire is not excessively brittle.  To our knowledge, no other normal logging operations require the wire to be bent at such a small diameter. Thus, we suggest that several wires in the cable in question be checked for brittleness by bending or wrapping the subject wires around a diameter corresponding to the bend the wires will suffer in the normal re-heading operation of joining the cable to the logging tool.  If the wires pass this test, then the cable should not fail due to the wires failing because of excessive bending.

Please contact me if you need additional details.

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