Marine CWD Series Horizontal Multistage Centrifugal Pump

Best Marine CWD Horizontal Multistage Centrifugal Pump

The CWD centrifugal pump adopts a horizontal layout with a multistage segmented design, utilizing multiple impellers arranged in series to achieve high head and high-efficiency liquid delivery. Its main components include the suction casing, intermediate casing, discharge casing, impellers, guide vanes, pump shaft, shaft sleeves, bearings, and a balancing mechanism. The balancing mechanism effectively offsets the axial thrust generated by multistage impeller operation, ensuring stability and reliability during long-term continuous operation.

The pump casing interfaces are secured with high-strength bolts and sealed with gaskets, enabling the pump to withstand vibration and pressure fluctuations in demanding marine environments. The impellers and guide vanes feature optimized hydraulic design, improving efficiency and reducing cavitation risks, while the pump shaft undergoes heat treatment and anti-corrosion processing, allowing it to handle seawater and various liquids with properties similar to fresh water over extended periods.

• Main applications: Widely used in marine cooling systems, ballast systems, bilge drainage, boiler feed water, high-pressure washing, and fire-fighting water supply, especially suitable for large flow rates and medium to high heads in continuous operation.

CWD Horizontal Multistage Centrifugal Pump Features

Balancing Mechanism

The CWD pump adopts a combined balancing ring and balancing disc axial thrust balancing structure, which effectively offsets the axial thrust generated by multistage impeller operation through precisely designed balancing ring clearances and back-chamber pressure distribution. This significantly reduces bearing loads, prolonging the service life of bearings and shaft seals. During operation, special attention must be paid to the discharge and circulation of the balancing liquid, preventing abnormal pressure or stagnation in the balancing chamber, thereby ensuring stable and reliable performance under high head and long-duration continuous operation conditions.

Shaft Sealing Design

The pump offers high-performance packing seals or mechanical seals, with the sealing type selected based on the conveyed medium, temperature, and operating conditions.

• Packing seal: Suitable for general temperature and pressure conditions, requiring seal water for lubrication and cooling of the sealing chamber.
• Mechanical seal: Designed for high-speed, high-pressure applications and demanding sealing requirements. For high-temperature media (>80 °C), an independent cooling and flushing system is required to ensure reliable long-term operation of the seal faces, preventing failure caused by dry running or overheating.

High-efficiency Operation

The CWD pump features an advanced hydraulic model and optimized impeller–diffuser matching design, improving fluid flow uniformity, reducing hydraulic losses, and achieving higher operating efficiency. The pump components undergo dynamic and static balance calibration, resulting in smooth operation with low vibration and minimal noise, meeting the low-noise and high-reliability requirements of marine and industrial applications. Furthermore, the pump maintains an excellent efficiency curve across a wide operating range, ensuring high economic performance even under varying operating conditions.

Marine CWD Series Horizontal Multistage Centrifugal Pump Parameter