BS EN ISO 2307:2010 pdf download – Fibre ropes — Determination of certain physical and mechanical properties (ISO 2307:2010)
5.2 Balance, allowing measurement of mass to an accuracy of ±1 %.
6 Sampling
6.1 Sample size When specified by the purchaser, a lot sample for acceptance testing shall be taken at random in accordance with 6.4.
6.2 Sample unit If required, test samples shall be taken from each shipping unit, in the lot in the number and the length required to perform the specified tests. The test samples shall be included in the delivered mass or length. As an alternative, the manufacturer’s production and inspection records may be used, if agreed upon between the purchaser and the manufacturer.
6.3 Composition of the batch to be sampled Samples shall be taken from a homogeneous batch, i.e. consisting of ropes of the same size and same dimensions and which have been subject to the same series of manufacturing operations and the same control procedure.
6.4 Selection of samples Take the number N S of samples at random from the batch in accordance with Equation (1): S 0,4 N N = (1) where N is the batch size, expressed as the number of 220 m coils. When the calculated value of N S is not a whole number, the number obtained shall be rounded to the nearest whole number. EXAMPLE 27,5 and 30,35 are rounded to 28 and 30, respectively. Where N S < 1, take one sample length. 7 Test pieces for tensile testing and force-elongation 7.1 Length The test piece shall be of adequate length to give an effective length, L u (see 9.3), between terminations which is at least equal to that given in Table 1, when mounted on the tensile testing machine (see Figures 1, 2 and 3). 7.2 Number of test pieces Take one test piece from each sample. 7.3 Taking the test pieces Take the test piece either from one end of the samples, or from the body of the samples if they are intended to be cut. Take all necessary steps to prevent unlaying. If necessary, remove slightly unlaid ends. 8 Conditioning Ropes shall be tested in the ambient atmosphere, except in cases of dispute, when the test piece shall be placed in the atmosphere specified in ISO 139 for at least 48 h, immediately prior to testing. 9 Procedure 9.1 General For the measurement of force-elongation and breaking force, perform the procedures specified in 9.2 to 9.7 sequentially. For the linear density, perform the procedures specified in 9.8. 9.2 Initial measurements Lay the test piece out straight on a flat surface by pressing with a slight force of the hand (not exceeding 20 % of the reference tension) (see Annex A). Make two “w” marks on the test piece, spaced symmetrically with regard to its mid-point, and at a distance apart of l 0 that is greater than 400 mm. In exceptional circumstances, when L u < 400 mm, l 0 and l 2 (see 9.4) are measured on a separate test piece, with a minimum length of 400 mm, following the same procedure; the value l 2 is obtained by applying the appropriate tension by means of weights and a pulley. 9.3 Mounting the test piece on the testing machine Fix the ends of the test piece onto the machine, in order to obtain the effective length of the test piece specified in 7.1. In the case of a test on splices, the eyes shall have a minimum internal length of 6 times the rope diameter when closed; their production is left to the manufacturer's discretion. In the case of man-made fibre ropes, it is recommended that the ends of the splices be tapered to finish. Outside the segment l 0 , make two “r” marks on the test piece, delimiting the section in which a rupture is considered as normal, as shown in Figures 1 to 3. The distance from each mark “r” to the end of the splice (or to the tangent point in the case of a “ cors de chasse ”) shall be a minimum of twice the diameter and a maximum of three times the diameter of the rope.