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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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There are two major BPAbased industrial polycarbonate processes: two-phase interfacial process (or simply phosgene process) and melt transesterification process [1], In the interfacial process, a two-phase mixture of BPA, phosgene (carbonyl dichloride), and a small amount of chain stopper dissolved in methylene chloride is polymerized with a tertiary amine catalyst and sodium hydroxide solution added to maintain the appropriate pH (10-12) at low temperature (40[degrees]C).
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.
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.
During polyurethane formation, high molecular weights can not be attained because the monol acts as a polymerization chain stopper. In addition, the unreacted polyol chain end (carbon-carbon double bond) acts as an internal plasticizer.
Rising outputs have led to the industry growths in line with that of the global GDP, further driving the demand growth for Isatoic Acid Anhydride, which is used as a chemical intermediates and chain stoppers in polymer and rubber manufacturing.
The order from Bluewater Industries covers design and delivery of eccentric fairlead chain stoppers and roller RamWinches for a deep draft production unit owned by ATP Oil & Gas Corporation, while the DSME order covers similar equipment for the Pazflor FPSO under construction by DSME in Korea.
* D4 is polymerized in the presence of a strong base like KOH where the ring opens for chain formation, and chain stoppers are used to terminate the process.
Norwegian industrial group Scana Industrier ASA said on Tuesday (30 October) that its subsidiary Scana Steel Stavanger has received an order for chain stoppers from the Norwegian deck machinery manufacturer Karmoy Winch AS.