chain stopper

chain stopper

[′chān ‚stäp·ər]
(naval architecture)
A short chain with a hook attached to a ship's forecastle, used to secure the anchor chain when the anchor is raised or lowered, thus relieving the windlass from strain, or to quickly release the anchor.
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Parent company Aker Solutions says the fairlead chain stopper is an innovative system designed to constrain the mooring load to a limited area on the hull.
The order comprises 14 Pusnes fairlead chain stoppers and three moveable Pusnes windlasses for 165 mm (6 1/2 in) chain size.
2 mole % with respect to the total number of amine groups) of the chain stopper phthalic anhydride was added portionwise to the DAB/NMP solution under stirring at room temperature.
Contrary to the poly(BTDA-DAB) synthesis described before (16), where a dianhydride solution in NMP was added to a DAB/NMP solution, in this study the dianhydride (and optionally the chain stopper phthalic anhydride, PA) was added as a solid.
In the case of PIs 6 and 7, a 2 mole % excess of BTDA was used instead of the monofunctional chain stopper phthalic anhydride (PA).
During polyurethane formation, high molecular weights can not be attained because the monol acts as a polymerization chain stopper.
For this newbuilding NDM will supply the following equipment: Two combined windlass/moowing winches (electrical, frequency controlled, driven), two off chain stoppers, two off tugger winches (hydraulic driven), two off capstans (hydraulic driven) and six off cargo securing winches (hydraulic driven).