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Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often used to keep waterways navigable.
It is also used as a way to replenish sand on some public beaches, where sand has been lost because of coastal erosion. Dredging is also used as a technique for fishing for certain species of edible clams and crabs, see fishing dredge.
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.
The process of dredging creates spoils (excess material), which are carried away from the dredged area. Dredging can produce materials for land reclamation or other purposes (usually construction-related), and has also historically played a significant role in gold mining. Dredging can create disturbance in aquatic ecosystem, often with adverse impacts.
370HP Principal Dimensions and ParticularsMetric English GENERAL Hull Length 10.98 m 36 ft. Hull Width 3.66 m 12 ft. Hull Depth 1.22 m 4 ft. Length Overall 17.53 m 57.5 ft. Height Overall (spuds installed and elevated) 8.88 m 29.13 ft. Height Overall (Spuds, spud hoists, and muffler removed) 3.2 m 10.7 ft. Draft - Max. with spuds and ladder raised .81 m 2.67 ft. Fuel Storage Capacity 3050 L 800 gals. Approximate Weight - Lt. and Dry 25,396 kg 56,000 lbs. DIGGING DEPTH Maximum (*) 6.10 m 20 ft. Minimum 0.9 m 3 ft.
CHANNEL WIDTHMaximum @ 40' Swing each side CL @Min. Digging Depth 22.25 m 73 ft. @ Max. Digging Depth 18.29 m 60 ft. Minimum @ Minimum Digging Depth (Hull Grounded) 9.3 m 30.5 ft. PRIME MOVER Caterpillar Diesel Engine Choice of models available: CAT 3406 CAT C15 306 kw 328 kw 410 HP 440 HP CUTTER Shaft Power 30 kw 40 SHP Cutting Force 1,815 kg 4000 lbs Cutting Force per Linear Inch of Edge 29 kg 64 lbs. Cutter Speed
0 - 39 RPMCutter Diameter 800 mm 31.5 in SWING WINCHES Shaft Power 15.4 kw 20.6 HP Line Pull - First Layer 3,629 kg 8000 lbs Line Speed - First Layer 0-22.8 m/min 0-75 ft/min Wire Size 12.7 mm 1/2 in Drum Capacity 61 m 200 ft.
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