Final answer:
D-shackles and bow shackles are the two types of shackles used in salvage operations, with each having different shapes and construction. D-shackles have a D-shaped body, while bow shackles have a bow-shaped body. D-shackles are used for temporary connections, while bow shackles are used for permanent connections.
Step-by-step explanation:
The two types of shackles used in salvage operations are D-shackles and bow shackles. They differ in their shape and construction.
A D-shackle, also known as a chain shackle, has a D-shaped body with a small loop on one end and a threaded pin or bolt on the other end. It is mainly used for temporary connections and has a high working load limit. The D-shaped body allows for a higher degree of angular movement.
On the other hand, a bow shackle, also known as an anchor shackle, has a bow-shaped body with a large, rounded loop on one end and a threaded pin or bolt on the other end. It is primarily used for permanent connections and has a higher strength-to-weight ratio compared to D-shackles. The bow shape provides a larger internal space for connecting multiple objects.