Rope strengths are tested according to Marlow’s QA25 and 26 quality procedures. Generally these procedures are in line with
BS EN ISO 2307, however, a number of other internationally recognised test standards are used including
EN 1891, EN 1892 and
EN564
Marlow Ropes generally specify a Minimum Breaking Load (or sometimes an Average Breaking Load). It is the responsibility of the user to determine an appropriate factor of safety and Safe Working Load. This factor of safety must be determined after considering all the risks, the strength reducing factors, and the expected life of the rope. The table on the left shows some of the factors that may affect the determination of the factor of safety.
La plupart des résistances des cordes du catalogue sont données en kilogrammes (kg). Cependant, la mesure correcte de la force ou de la résistance à la rupture est le Kilonewton (kN). Les facteurs de conversion de l'un à l'autre sont les suivants:
1 Kg = 0.00981 kN
1 kN = 101.972 kg
Rope mass is determined be weighing a sample of rope whose length has been measured at a reference load. For most ropes this load is calculated as:
Charge de référence (kg) = D 2 / 8
Où: D est le diamètre nominal de la corde (mm)