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A deep-penetrating anchor (DPA) is conceptually similar to a torpedo anchor: it features a dart-shaped, thick-walled, steel cylinder with flukes attached to the upper section of the anchor. A full-scale DPA is approximately 15 metres (49 ft) in length, 1.2 metres (4 ft) in diameter, and weighs on the order of 50–100 tonnes (49–98 long tons ...
Aiviq is an American icebreaking anchor handling tug supply vessel (AHTS) built in 2012 to support oil exploration and drilling in the Chukchi Sea off Alaska. The vessel's primary task was towing and laying anchors for drilling rigs, and oil spill response. [6] [7] [8] In December 2024, the USCG finalized the contract for the acquisition of ...
A marine parachute anchor for a large yacht awaiting bagging up. A conical sea anchor with tripline (from an illustration in The Sailors Handbook by Halsey C. Herreshoff). An early wooden drogue. A sea anchor (also known as a parachute anchor, drift anchor, drift sock, para-anchor or boat brake) is a device that is streamed from a boat in heavy ...
Dimethyl carbonate (DMC) is an organic compound with the formula OC(OCH 3) 2. It is a colourless, flammable liquid. It is classified as a carbonate ester. This compound has found use as a methylating agent and as a co-solvent in lithium-ion batteries. [1] Notably, dimethyl carbonate is a weak methylating agent, and is not considered as a ...
A stream anchor, which is usually heavier than a kedge anchor, can be used for kedging or warping in addition to temporary mooring and restraining stern movement in tidal conditions or in waters where vessel movement needs to be restricted, such as rivers and channels. [43] Charts are vital to good anchoring. [44]
Deadweight tonnage is a measure of a vessel's weight carrying capacity, not including the empty weight of the ship. It is distinct from the displacement (weight of water displaced), which includes the ship's own weight, or the volumetric measures of gross tonnage or net tonnage (and the legacy measures gross register tonnage and net register tonnage).
The term can be applied to many nautical situations: Foul hawse — when a ship lying to two anchors gets the cables crossed. [2]Foul bottom — in reference to a seafloor that has poor qualities for securing an anchor, such as hard rocks, coral, wreckage, or other impediments that would make securing or unsecuring an anchor difficult or impossible.
An anchorage is a location at sea where ships can lower anchors. Anchorages are where anchors are lowered and utilised, whereas moorings usually are tethering to buoys or something similar. The locations usually have conditions for safe anchorage in protection from weather conditions, and other hazards.