World’s largest 1800 mm marine dredging sand pump localization project ｜ China

Application scenario: domestically localized ultra-large dredging sand pump certified by CCS + BV. Main unit 1800 mm single-stage split-case sand pump: flow 45,600 m³/h, head 92 m, matched with 10,800 kW motor; capable of handling 260 mm gravel, solids content 70%; global record in commercial pump flow/diameter. Double-stage series head 185 m for 120 m deep hopper dredgers; 1600 mm submersible pump rated 0.4 MPa / 38 m depth full electric explosion-proof. Used in trailing suction hopper dredgers, cutter suction dredgers, offshore sand mining, land reclamation, river dredging, Belt and Road projects. Marine conditions: high-speed sand/stone erosion + chloride corrosion; cast iron wears through in 3 months; 50-ton casting deformation risk; wide voltage ±25%; low NPSHa cavitation; compact engine room requiring quick maintenance; salt fog condensation requiring marine protection.

 

Solution content: six breakthroughs by M&W ENERGY SAVING —

1）CFD two-phase flow simulation + wide-flow 3D impeller, efficiency 83%–85.2%, 12%–18% energy saving vs imported pumps;

2）graded wear resistance: offshore Cr33 high-chrome alloy (HRC62), inland 2507 duplex + silicon carbide lining, polyurethane liner; ZG20Mn casing -22℃ no brittle fracture + double marine coating; stainless fasteners 316L;

3）100-ton furnace integral casting + 5-axis machining, split-plane flatness ≤0.03 mm, 4340 shaft deflection <0.1 mm;

4）world-unique ultra-large horizontal split quick opening: upper casing lifted without disturbing pipelines, maintenance 12h → 3.5h;

5）190–480V intelligent VFD + PT100 / vibration / slurry concentration monitoring + AI fault prediction; diesel-electric hybrid reducing fuel consumption >20%;

6）1600 mm submersible pump fully sealed pressure-resistant oil chamber + explosion-proof zero leakage design. CCS + API610 + DNV certification + IPPC export packaging.

 

Project results: import price >12 million RMB per unit reduced by 40%; annual procurement saving over RMB 100 million; wear life extended from 6 months to 18 months; maintenance downtime reduced by 70%; dredger annual fuel/electric saving over RMB 1 million per vessel; system energy saving 12%–18%; full domestic supply chain for 800–1800 mm dredging pumps; replicable to global dredging equipment manufacturers and Belt & Road projects.

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