Universal California Active Type Dredge Drag Head

Features: 1. Easy to maintenance. 2. Suction pipe diameter from 400 to 1300mm. 3. Efficient hydraulic design. 4. Replaceable wear blocks and side skirts. 5. Replaceable teeth system Dredge Drag Head Type: 1. Universal drag heads. 2. California drag heads. 3. Active drag heads. The dredge drag...



1.Easy to maintenance.

2.Suction pipe diameter from 400 to 1300mm.

3.Efficient hydraulic design.

4.Replaceable wear blocks and side skirts.

5.Replaceable teeth system

Dredge Drag Head Type:

1.Universal drag heads.

2.California drag heads.

3.Active drag heads.

The dredge drag head is a steel structure that is connected to the dredger by a suction pipe. Supported by the gantries and by using hydraulic winches the dredge drag head and suction pipe are let down onto the sea bottom in order to suck a mixture of water and sand.

To cut the sea bed, the dredge drag head is equipped with replaceable teeth and water jet nozzles. The nozzles are placed at the front of the dredge drag head and used to cut the sand at the sea bed vertically. While the replaceable teeth are placed at the back to cut horizontally.

Application: Dredge drag head is used by a trailing hopper suction dredger to collect sand from the sea floor.

Suction Pipe Dia. (mm)

Body Length


Active Cover

Length (mm)

Body Breadth


Active Cover

Breadth (mm)






Note: Dredge drag heads can be designed according to client’s special requirements.

Types of vessel


Tankers are vessels that carry liquids in bulk.


80,000-120,000 dwt- only carry crude oil.

Chemical tanker Usually vary from 5,000-40,000 dwt. They carry small parcels of high value chemicals.

Liquid natural gas (LNG) Vary in size from under 20,000 dwt to over 130,000. They only carry natural gas in liquid form.

Liquid petroleum gas (LPG) These vary in size, but are usually around 80,000 dwt.

The carry liquefied petroleum gas- such as butane and propane –and a small selection of other liquefied gases like ammonia.

Product tanker Vary from 10,000-100,000dwt. They usually carry refined petroleum products (white oils) and black oils in greater volumes than chemical tankers do.

Suezmas 120,000-200,000 dwt. Only carry crude oil. They are the largest vessels capable of passing through the Suez Canal.

VLCC(very large crude carrier)Up to 200,000 dwt. They only carry crude oil.

ULCC(Ultra large crude carrier)

Bulkers, or bulk carriers, are vessels that carry bulk solids.

Capersize> Panamax>Handymax>Handysize

80000 > 50000 > 35000 >10000


These are 80,000 dwt and over. They normally carry cargoes such as iron ore, coal and so on.


50,000-80,000 dwt typical cargoes include coal, fertilizer and so on. They are the largest vessels which can pass through the Panama Canal.


35,000-50,000 dwt. They carry a wide range of bulk cargoes such as fertilizer, scrap etc.


10,000-35,000 dwt. They carry general bulk solids.


OBO stands for ‘ore/bulk/oil’ and the vessels are sometimes called combined carriers. They can carry solids (ore and bulk cargoes) and crude oil, but not at the same time.


PROBO stands for ‘product ore/bulk/oil’. They carry the same cargo as OBOs, but can also carry refined petroleum products. This is because the cargo holds are usually coated with a cargo tank coating.

Container ship

These carry a cargo of containers on scheduled routes. Size is normally measured in teu (the size of a 20 foot standard container). The biggest can be up to 8100 teu.

General cargo

These are small vessels carrying a wide range of paletted and individual cargoes-for instance, machinery, drums, bags and so on.


RORO stands for ‘roll on, roll off’. These vessels carry road and rail vehicles and can be unloaded by wheeled transport.

Car carrier

Car carrier, or vehicle carriers, carry newly manufactured cars.


Reefers are refrigerated cargo vessels. They are similar to general cargo vessels, but the holds are refrigerated. They usually carry perishable foods like and meat.


FPSO are floating production storage and offloading vessels. They take crude oil from undersea wells, process it and store it before loading it into tankers to be carried to a refinery or land storage.

Passenger ship

Vessels either carrying passengers between ports (a ferry) or for pleasure (a cruise vessel).


There are a number of vessels designed to carry the particular type of cargo they named after- for instance, wood chip carrier, cement carrier. They have a similar design to tankers (for specialize liquids) or bulkers (for particular cargoes). They are also likely to have specialized equipment.

Ferry, Barge, Tug boat Ice Breaker Dredger, Supply vessel, Drill ship,Semi-Submersible, Salvage vessel, Life boat, Sampan, Destroyer,Frigate, Cruiser, Submarine,Aircraft carrier

Should you have any preference for the universal california active type dredge drag head, welcome to buy the quality equipment with our factory. As one of the most professional marine equipment manufacturers and suppliers in China, we will offer you good after-sale service and fast delivery.

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