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Published Cable and Individual Wire Breaking Strengths

Cable Breaking Strength

Camesa publishes for each type of cable we manufacture a minimum breaking strength. The cable breaking strength can be calculated fairly accurately as well as measured on a breaking bench. The wires making up all Camesa cables are specified to have a breaking strength lying in the range 267,000 to 300,000 psi. A calculation of a cable's minimum breaking strength could be carried out as follows. Consider a 5/16" diameter monocable, a 1N32PP. The catalog lists an 11,000 lb. minimum breaking strength. All 12 inner and 18 outer armor wires are .0445" in diameter and have a minimum breaking strength of

267.OOOlb/sq.in.X.0445inx.0445inx3.14159/4 = 415 lbs.

This is the strength of the individual wires that we use to calculate the minimum breaking strength of the cable. The minimum breaking strength calculation is

MIN BS	=	M X 415 lb X COS(A) + N X 4151b X COS(B)
	=	18 X 415 1b X COS(19.2) + 12 X 4151b X COS(21.5)
MIN BS	=	11,687 lbs.

Where,

N = number of outer armor wires

N = number of inner armor wires

A = outer armor lay angle

B s = inner armor lay angle

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Camesa, Inc · 1615 Spur 529 · P.O. Box 1048 · Rosenberg, Texas 77471 Phone: (281) 342-4494 · Fax: (281) 342-0531