BS ISO 10425 pdf download – Steel wire ropes for thepetroleum and naturalgas industries —- Minimum requirements and terms of acceptance.
4.4 Lay length
For single-layer ropes of 6 7 class, tile length of lay ci the finished rope shall not exceed 8 rope diameter (d).
For other single-layer ropes with round strands (except those with three or four strands), parallel-lay closed ropes and rotation-resistant ropes with round strands or shaped strands, the length of lay of the finished rope shall not exceed 7.25 x rope diameter (d).
For single-layer ropes with shaped strands, e.g. triangular strand, the length of lay of the hushed rope shall not exceed 10 K rope diameter (d).
For well-servicing strand, the length of lay of the finished strand shall not exceed 10 x strand diameter (d).
4.5 Breaking force
4.5.1 Well-measurIng wire
The minimum breaking force for a given diameter of well-measuring wire shall be as given in Clause C. I. When tested in accordance with the method specified in Clause C.2, the measured breaking force shall be greater than or equal to the minimum breaking force.
4.5.2 Well-servicing strand
The minimum breaking force for a given chanueter and construction shall be either
a) asgiveninAnnexD.or
b) as stated by the manufacturer.
When tested I, accordance with Method I (see 5.1.4 1). the measured breaking force shall be greater than or equal to the minimum breaking force.
4.5.3 Stranded ropes and spiral ropes
4.5.3.1 General
The minimum breaking force. Fmm, for a given rope diameter and construction shall be either
a) as given in Annex G for stranded ropes, or
b) as stated by the manufacturer
NOTE I Values of miiwnum breakng force for large diameter stranded and Spiral ropes are given for iniormation in AnnexJ.
For those ropes covered in Annex G, the minimum breaking force of intermediate rope diameters shall be calculaled with the respective minimum breaking force factors in accordance with Annex F
When tested in accordance with Method I of 5,1,4.1. the measured breaking force, Fm, shall be greater than or equal to the minimum breaking force,
Breaking force testing requirements shal be in accordance with Table 4.
NOTE 2 The requirements tot breaking force take into account: (if the rope size; (II) Miether or not ropes are produced in series, i.e. repeatedly produced: (ii whether or not the mininsm breaking force factor is consistent throughout a range of diameters: (lv) whether ow not the manufacturer is operating a quality system in accordance with ISO 9001, certified by an accredited third party certification body.
4.5.3.2 Ropes produced In series — Manufacturer operating a quality system In accordance with ISO 9001, Certified by an accredited third party certification body
The manufacturer shall be able to provide the results from type testing in accordance with the sampling and acceptance criteria given in Annex H.
Type testing shall be repeated on any rope that has its design changed in any way which results in a modified (e.g. increased) breaking force. If the same design, apart from wire tensile strength grades, is used for ropes of a lower grade or lower breaking force, or both, than the one which has successfully passed the type testing requirements, it shall not be necessary to repeat the tests on those ropes provided the breaking force is calculated with the same spinning loss.
Subsequent production lengths of ropes produced in series shall be deemed to conform to the breaking force requirements when the manufacturer has satisfactorily completed
a) the appropriate type tests (see Annex H). and
b) a periodic breaking force test in accordance with Method I or one ot the alternative methods, known as Methods 2 and 3 (see 5.1.4.2 and 5.1.4.3).
on a sample Iron, every twentieth production length.
BS ISO 10425 pdf download – Steel wire ropes for thepetroleum and naturalgas industries —- Minimum requirements and terms of acceptance
