Sunday, December 23, 2012

Special Cover - Kachchhpex 2005 - Dredgers

Date of Issue: November 30, 2005

A special cover was issued during Kachchhpex - Kachchh District-level Philatelic Exhibition, the cover sponsored by Jaisu Shipping Company P. Ltd. Kandla Port.

The cover illustration mentions "Role of Shipping in growth of Indian Economy" and depicts two of the dredgers from the fleet of Jaisu Shipping Company.

Dredger:  A dredger (or “dredge” as is the general usage in the Americas) is any device, machine, or vessel that is used to excavate and remove material from the bottom of a body of water. For example, a scoop attached to the end of a rope or pole by which a man can draw sediments up from the bottom of a pond is a dredger. Developing this idea further, a motorized crane equipped with a drag bucket or clamshell (grabber) that is used to scoop material from the bottom of a body of water is also a dredger. The crane could be located on the bank, or perhaps mounted on a barge. If the crane is mounted on a barge, the entire vessel is referred to as a dredger.

Kamal XXV:  Formerly Kutch Vallabh, built in 1975 at Mazagon Dock Yard, Mumbai and rebuilt in 1998 is a type of Trailing Suction Hopper Dredger - (TSHD) that trails its suction pipe when working, and loads the dredge spoil into one or more hoppers in the vessel. When the hoppers are full, the TSHD sails to a disposal area and either dumps the material through doors in the hull or pumps the material out of the hoppers. Some dredges also self-offload using drag buckets and conveyors.

Kamal XXVI:  Built in 1989 is a type of Rock Bucket Ladder Dredger - A bucket dredger is equipped with a bucket dredge, which is a device that picks up sediment by mechanical means, often with many circulating buckets attached to a wheel or chain. Some bucket dredgers and grab dredgers are powerful enough to rip out coral to make a shipping channel through coral reefs.

Source: Wikipedia,

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