It’s a Chock

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A guide for a mooring line, or steel towing wire which enables the line to pass through a ship bulwark or other barrier. 

Double chock – A large chock capable of withstanding the stress caused by a load of two towing wires. According to requirements of the Panama Canal the double chock is a closed chock that has a throat opening of not less than 900 cm2 area, and is capable of withstanding the stress caused by a load of 64,000kg from the towing wires in any direction.

Single chock – Chock designed for a single towing wire. According to the requirements of the Panama Canal the single chock is a closed chock that has a throat opening of not less than 650 cm2 area, and is capable of withstanding the stress caused by a load of 45,360kg from a towing wire in any direction.

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Source: Wartsila

1 COMMENT

  1. It’s not a chock, it’s a panama lead (or panama fairlead) – never heard in 40 + years at sea of these being called chocks – a chock is something to stop vehicle wheels rolling ….

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