API 9A:2004 pdf download

API 9A:2004 pdf download.Specification for Wire Rope.
5.1.4.2 Method 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 value 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 triangular 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 force”.
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 de-rated minimum breaking force value or delete it from the rope designation.
5.1.4.3 Method 3 — Calculated measured (pre-spin) 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 (prespin) 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 de-rated minimum breaking force value or delete it from the rope designation.
5.1.5 Tests on wires from the rope
When tests, if any, are required 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.
5.2 Tests on well-measuring wire
The tests shall consist of a simultaneous elongation and tensile test and a separate torsion test. Testing
methods and acceptance criteria shall be in accordance with Annex C.
5.3 Tests on well-servicing strands
The tests shall consist of a measured diameter in accordance with 5.1.3 and a breaking force test in accordance with 5.1.4.1.
5.4 Facilities for witnessing tests
The manufacturer shall offer the purchaser or purchaser’s representative all necessary facilities for the witnessing of tests (when these are performed) or for the examination of records of type tests in order to be assured of compliance with this International Standard, or both.
Test lengths required by the purchaser should be ordered as additional lengths.
6 Information for use
6.1 Certificate
6.1.1 General
A certificate shall confirm conformance with this International Standard and, unless specified otherwise by the purchaser, shall give at least the following information:
a) certificate number;
b) name and address of the manufacturer;
c) rope designation or rope description;
d) minimum breaking force;
e) date of issue of the certificate and authentication. Quantity and nominal length of rope may also be included The certificate shall enable traceability of the rope.