Incredible Modern Monster Ship Anchor Handling Offshore Technology

Anchor Handling Tug Supply (AHTS) vessels are mainly built to handle anchors for oil rigs, tow them to location, and use them to secure the rigs in place. AHTS vessels sometimes also serve as Emergency Response and Rescue Vessels (ERRVs) and as supply transports.
Many of these vessels are designed to meet the harsh conditions of the North Sea, and can undertake supply duties there between land bases and drilling sites. They also provide towing assistance during tanker loading, deepwater anchor handling, and towing of threatening objects.

AHTS vessels differ from platform supply vessels (PSVs) in being fitted with winches for towing and anchor handling, having an open stern to allow the decking of anchors, and having more power to increase the bollard pull. The machinery is specifically designed for anchor handling operations. They also have arrangements for quick anchor release, which is operable from the bridge or other normally manned location in direct communication with the bridge. The reference load used in the design and testing of the towing winch is twice the static bollard pull.
Even if AHTS-vessels are customized for anchor-handling and towing, they can also undertake, for example, ROV (remotely operated underwater vehicle) services, safety/rescue services, and supply duties between mainland and offshore installations.

Anchor handling winch is specially designed for anchor handling towing operations installed on vessel deck, and it can be driven by electric motor, hydraulic pump pack or diesel engine unit. To release undesired tension, the winch is fitted with emergency release mechanism. The anchor handling winch and the winch rope is designed depending on the bollard pull needs. The breaking strength of the windlass rope should be twice to two and a half times of bollard pull force. The braking holding of the winch should be 1.5 times of the bollard pull or 80% of the rope breaking force.
The anchor handling towing winch can be driven by hydraulic pump station or electric power unit or diesel driven system. It generally has two or more drums and they can be placed side by side or in waterfall arrangement; there are a variety of winch systems and configurations and they share common features on modern ships. The anchor handling drum or drums share a common driven system with the towing drum, and the dimension and rated capacity of the former are almost the same as these of the latter. The anchor handling winch drum usually has a faster pulling speed or multiple gear range to allow the high hauling force at low gearing. Many vessels tend to equip with high or low pressure hydraulic winch systems and some favor electric or diesel driven winch systems. The spooling gear is not often outfitted because it restrains some aspects of anchoring handling operations especially during fast pay-out and recovery work. Chain wheel is usually fitted for the winch chain.

In the video below, we can see Incredible Modern Monster Ship Anchor Handling Offshore Technology
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