API 9A:2004 pdf download

API 9A:2004 pdf download.Specification for Wire Rope.
5.1.4.2 M.thod 2— Calculated measured (post-spin) breaking force
Add together the measured breaking forces of all individual wires after they have been removed from the rope and multiply this vakie by either
a) the spinning loss factor derived from Annex F, or
b) the partial spinning loss factor obtained from the results of type testing.
The partial spinning loss factor used in the calculation shall be the lowest of the three values obtained from type testing
In the case of triangular strand ropes, the tnangular centre of the strand may be considered as an individual wire.
Test the wires in accordance with the wire tensile test specified In Clause B.2 or In ISO 6892. NOTE The result from this test is known as the calculated measured (post-spin) breaking forc&
When this method (i.e. Method 2) is used for the periodic test (see Table 4) and the calculated measured (post-spin) breaking force value is less than the intended minimum breaking force value, carry out another test using Method 1.
If the measured (actual) breaking force in this second test fails to meet the intended minimum breaking force value, de-rate the minimum breaking force to a value not exceeding the measured (actual) breaking force value and repeat the type testing using Method 1.
In such cases, either de-rate the rope grade in line with the dc-rated minimum breaking force value or delete it from the rope designation.
5.1.4.3 Method 3 — Calculated measured (pre-spln) breaking force
Add together the measured breaking forces of all the individual wires before they are laid into the rope and multiply this value by the total spinning loss factor obtained from the results of type testing. The total spinning loss factor used in the calculation shall be the lowest of the three values obtained from type testing.
The wires shall be tested in accordance with the wire tensile test specified in ISO 6892.
NOTE The result from this test Is known as the calculated measured (pre-spin) breaking force.
When this method (i.e. Method 3) is used for the periodic test (see Table 4) and the calculated measured (pie- spin) breaking force value Is less than the Intended minimum breaking force value, carry Out another test using Method 1.
If the measured (actual) breaking force in this second test fails to meet the Intended minimum breaking force value, de-rate the minimum breaking force to a value not exceeding the measured (actual) breaking force value and repeat the type testing using Method 1.
In such cases, either de-rate the rope grade in line with the dc-rated minimum brealcing force value or delete it from the rope designation.
5.1.5 Tests on wires from the rope
When tests. if any, are requied to be performed on wires taken from the rope after fabrication, and unless specified otherwise by the purchaser, sampling, test methods and acceptance criteria shall be in accordance with Annex I.
If tests on the wires are required to be carried out, this should be stated in the purchaser’s order.
E.3 Selection of test piece
The test piece shall be representative of the rope as a whole. The selected test piece shall have its ends secured to ensure that the wires and strands remaán undisturbed. Simalarty secure the end of the rope from which the test piece is taken.
When cutting the test piece from the rope. neither the test piece nor the main part of the rope shall be damaged.
E.4 Method of test
E.4i Preparation
Mount and secure the test piece in the machine so as to ensure that all wres in the rope are subjected to the force dunng the test.
If sockets or cones are to be used. sockeUng shall be in accordance with the appropriate ISO, or equivalent. procedure.
After 80 % of the minimum breaking force of the rope has been applied. Increase the force at a rate not more than 0.5 % of the minimum breaking force per second.
The measured breaking force is reached when no further Increase in applied force is possible.
The test may be terminated without breaking the rope when the minimum breaking force is achieved or exceeded.
The test may be discounted where the rope fracture occurs within a distance equivalent of six rope diameters from the base of the grip or the termination and the intended minimum breaking force has not been reached.