{"id":2763,"date":"2026-07-02T06:42:37","date_gmt":"2026-07-02T06:42:37","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/trailing-suction-dredger-heave-compensation-cylinder\/"},"modified":"2026-07-02T06:42:42","modified_gmt":"2026-07-02T06:42:42","slug":"trailing-suction-dredger-heave-compensation-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/ru\/product\/trailing-suction-dredger-heave-compensation-cylinder\/","title":{"rendered":"Trailing Suction Dredger Heave Compensation Cylinder"},"content":{"rendered":"

<\/p>\n
\n Trailing Suction Dredger<\/span><\/p>\n

Trailing Suction Dredger Heave Compensation Cylinder<\/h2>\n

The sea moves. The draghead must not. When a trailing suction dredger rides 2-metre swells, the hull rises and falls \u2014 but the draghead must stay pressed against the seabed at constant force. The heave compensation cylinder absorbs the wave motion, extending and retracting with every wave to keep the suction pipe stable.<\/p>\n

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\u2264400mm<\/span>Bore<\/span><\/div>\n
\u22644,000mm<\/span>Stroke<\/span><\/div>\n
1,600 KN<\/span>Thrust<\/span><\/div>\n
32 MPa<\/span>Pressure<\/span><\/div>\n<\/p><\/div>\n<\/section>\n
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Technical Specifications<\/h2>\n
<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Product Name<\/td>\nTrailing Suction Dredger Heave Compensation Cylinder<\/td>\n<\/tr>\n
Features<\/td>\nCompensate relative displacement of draghead and hull during wave heave<\/td>\n<\/tr>\n
Bore Diameter<\/td>\nUp to 400 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\nUp to 360 mm<\/td>\n<\/tr>\n
Stroke<\/td>\nUp to 4,000 mm<\/td>\n<\/tr>\n
Thrust Force<\/td>\nMaximum 1,600 KN<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 32 MPa<\/td>\n<\/tr>\n
Temperature Range<\/td>\n-40 \u00b0C to +100 \u00b0C<\/td>\n<\/tr>\n
Application<\/td>\nTrailing Suction Dredger<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n
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How Heave Compensation Keeps the Draghead on the Seabed<\/h2>\n
<\/div>\n

\"Trailing<\/p>\n

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A trailing suction dredger (TSHD) sails over the dredging area at 1\u20133 knots while a draghead on the seabed sucks up sediment through a trailing suction pipe. The pipe hangs from the hull into the water, and the draghead drags along the bottom. In calm water, this works smoothly \u2014 but in waves, the hull heaves up and down by 1\u20134 metres with every swell cycle (5\u201310 seconds per wave).<\/p>\n

Without heave compensation, this vertical hull motion would lift the draghead off the seabed on every wave crest (losing suction) and slam it into the bottom on every trough (risking structural damage). The heave compensation cylinder solves this by acting as a spring-damper between the hull and the suction pipe: when the hull rises, the cylinder extends to pay out slack; when the hull falls, the cylinder retracts to take up the excess. The draghead pressure on the seabed stays nearly constant throughout the wave cycle.<\/p>\n

The system uses a nitrogen gas accumulator connected to the cylinder \u2014 the gas provides a pneumatic spring force that can be tuned to match the draghead weight and desired seabed contact pressure. Korea Ever-Power supplies the heave compensation cylinder with matched accumulator sizing within the offshore hydraulic cylinder<\/a> range.<\/p>\n<\/div>\n<\/section>\n

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Passive vs Active Heave Compensation<\/h2>\n
<\/div>\n

\"Trailing<\/p>\n

Heave compensation systems for trailing suction dredgers fall into two categories. The choice affects cylinder design, system complexity, and performance in heavy seas:<\/p>\n

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Passive System (Standard)<\/strong><\/div>\n
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The cylinder is connected to a nitrogen accumulator that acts as a gas spring. The gas compresses and expands with wave motion, allowing the cylinder to extend and retract passively \u2014 no active control, no electronics, no sensors.<\/p>\n