I would like to get a response from the rope supplier, as the offshore industry is debating the use of this type of rope for use on platform cranes while the API Specification 2C eighth edition rewrite process is in progress. Wilfred Guidry Jr, competence lead, Sparrows A: Offshore cranes and mobile cranes are different applications. For mobile cranes, the use of nylon sheaves is acceptable with synthetic rope, as proved by multiple years of application use. For offshore cranes, many cranes employ an active heave compensation (AHC) system. This system is designed to maintain position of a load under the waterline while the vessel is moving with the ocean waves/swells. The AHC system requires that the position of the rope on the sheaves be adjusted with every wave cycle (912 second cycles) while under load. Also, in order to maintain the same winches payload position, the same section of rope repeatedly passes through the bend zone, generating heat at the rope and sheave, which can damage both. Therefore, steel or aluminium sheaves, which act as heat sinks, are recommended for these types of systems. Michael Quinn, director of new business development, Samson Rope Bend fatigue testing at Samson Rope, which offers the K-100 synthetic rope as an alternative to wire rope. A crane rope testing rig at the Teufelberger rope-technology centre.