Abandonment & Recovery winches range launched
Markey’s type DEPS-76AR is a single drum, direct-pull type winch with level wind designed to work 3,300m of 120mm diameter wire rope.
Markey Machinery introduced its new line of innovative Abandonment and Recovery (A&R) winches in time for the 2011 Offshore Technology Conference (OTC).
Development of Markey’s technologically advanced A&R winches was facilitated through partnership with a worldwide service provider operating a fleet of marine vessels. Compared to typical traction winches, Markey’s new A&R machines are significantly more cost effective in operation and maintenance requirements.
Markey’s type DEPS-76AR is a single drum, direct-pull type winch with level wind designed to work 3,300m of 120mm diameter wire rope. Redundant vector-motors developing 1,750 hp turn the drum through an induction hardened helical transmission. AC-variable frequency drives produce retrieval speeds of 32 m/minute and enable torque control down to zero speed. Markey’s automatic Render/Recover controls tame peak loads while pulling in 450Tm- over cable weight.
Distinctive features begin with the machine’s mechanical arrangement. The form of the DEPS is single drum, direct pull style of winch. Traction heads, alternatively, require multiple sheaves to produce the same pulling force. Bending wire ropes produces uneven strand loading and internal friction, leading to accelerated wear of expensive cables. The DEPS-76 is designed to maximize the working life of ropes. Service providers that couple properly engineered machinery with sound maintenance practices enhance on-site productivity, thus enabling greater margins on each project.
Markey’s engineers designed with a 34:1 D:d ratio, substantially larger and far easier on the wire rope than the 20:1 D:d ratio of traction winch systems. The automatic fairleader withstands the breaking force120mm diameter wire. The drum-fairlead system carefully lays each adjacent wrap, protecting the exterior strands of the wire rope from abrasion. Sizing the drum to store the full scope of wire in eight layers benefits the performance of the winch and minimizes wire point loading.
To make the machine more versatile, the engineers designed a field bolt-on wire rope kit to adapt DEPS-76 grooved drum cores and sheaves to different wire diameters if needed. This advanced A&R machine is optimized and customised for a single customer’s application and specifications.
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