MAR/Specific/TBT-MAR-008

Dredging Operations Safety

Marine & Coastal Works › Specific › Dredging Operations Safety

Presenter		Project
Location		Date

Dredging removes sediment from rivers, harbours, and channels to maintain navigable depths or create new formations.
Methods include mechanical dredging with grabs or backhoes, and hydraulic dredging with suction cutters.
Dredging vessels and barges operate in waterways with other marine traffic, creating collision risks.
Workers on dredging plant are exposed to drowning risk from falling overboard into deep turbid water.
Dredged material may be contaminated with heavy metals, hydrocarbons, or other pollutants requiring special handling.
Noise from dredging equipment regularly exceeds safe exposure levels for operators and deck crew.
Mooring lines, anchor cables, and wire ropes under tension create fatal snap-back zones on vessels.
Transfer of personnel between vessels and shore requires controlled procedures to prevent falls into water.
The Marine and Coastguard Agency regulations and the Port Marine Safety Code apply to dredging operations.
Environmental restrictions may limit dredging during fish spawning seasons or near protected habitats.

Drowning risk	Falls overboard from dredging plant into deep, turbid water are frequently fatal due to rapid incapacitation.
Contaminated material	Dredged sediment often contains toxic contaminants that cause skin irritation, respiratory harm, and long-term disease.
Snap-back injuries	Mooring lines and wire ropes under tension snap back violently when they fail, causing fatal impact injuries.

Don't

Wear a personal flotation device at all times when on the dredging vessel.
Use controlled access procedures for all transfers between vessels and shore.
Test dredged material for contamination before deciding the disposal method.
Identify and avoid snap-back zones around mooring lines and wire ropes.
Wear hearing protection when working near dredging pumps and equipment.
Maintain man overboard rescue equipment ready for immediate deployment.
Brief all crew on emergency procedures including man overboard and vessel flooding.
Comply with environmental restrictions on dredging seasons and disposal locations.
Handle contaminated dredged material with gloves, coveralls, and respiratory protection.
Coordinate with harbour authorities and other vessels regarding dredging movements.

DON'T work on the dredging vessel without wearing a personal flotation device.
DON'T stand in the snap-back zone of mooring lines or wire ropes under tension.
DON'T transfer between vessels by jumping; use approved gangways or platforms.
DON'T handle contaminated dredged material without protective gloves and clothing.
DON'T dispose of dredged material without testing for contamination first.
DON'T operate in restricted zones without environmental authority consent.
DON'T ignore hearing protection requirements near dredging equipment.
DON'T leave man overboard rescue equipment stowed in lockers during operations.
DON'T work on deck in rough conditions without securing your position.
DON'T enter confined spaces on dredging vessels without a confined space permit.

See also: Marine Works Safety Awareness | Man Overboard Procedures

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