Vertical long shaft semi submersible turbine pump solution applied in the shipbuilding industry

In the field of ships, vertical long shaft semi submersible turbine pumps can be applied to various specific scenarios such as seawater lifting, boiler feedwater, fire protection systems, and sewage discharge.
1、 Specific scenario solutions:
1. Sea water lifting system
Application scenario: During navigation, ships need to extract seawater from the ocean for cooling, ballast and other purposes, providing cooling seawater for the main and auxiliary engines of the ship, extracting ballast water to adjust the ship's draft depth, requiring compact volume, shock and vibration resistance, and adapting to ship swaying conditions.
Solution:
Pump type selection: Choose a vertical long shaft semi submersible turbine pump, whose long shaft design allows the pump body to penetrate deep into seawater and efficiently extract seawater.
Material selection: The overcurrent components are made of corrosion-resistant materials, such as duplex steel or super duplex steel, to resist the corrosion of seawater.
Structural design: The vertical long shaft semi submersible turbine pump adopts a vertical suction inlet and horizontal outlet layout, with a direct motor drive. The vertical structure occupies less space in the ship's cabin bottom, and the direct motor drive reduces vibration. The long shaft support structure is adapted to the deep water level of the ship's cabin bottom for water intake, and the fully sealed structure can adapt to the swinging conditions of ship navigation to avoid leakage risks. The pump body is submerged in seawater for operation, effectively reducing the risk of cavitation and ensuring stable water absorption.
Intelligent Control: Equipped with an intelligent control cabinet, it realizes functions such as automatic start stop, overload alarm, and remote monitoring based on liquid level, improving the automation level of equipment operation.
2. Boiler feedwater system
Application scenario: Boilers on ships require a stable water supply to ensure their normal operation.
Solution:
Pump type selection: Choose a vertical long shaft semi submersible turbine pump, whose high temperature and high pressure resistance can meet the requirements of the boiler feedwater system.
Material selection: The overcurrent components of the vertical long shaft semi submersible turbine pump are made of high-temperature and high-pressure resistant materials, such as stainless steel or alloy steel, to ensure stable operation of the equipment in high-temperature and high-pressure environments.
Sealing design: Adopting a dual mechanical seal structure to prevent boiler feedwater leakage and ensure system safety.
Energy recovery: Integrating an energy recovery device in the boiler feedwater system, utilizing the energy of high-pressure water to increase the raw water feed pressure and reduce the total energy consumption of the system.
3. Fire protection system
Application scenario: The ship's fire protection system needs to be quickly activated and provide high flow water supply to respond to emergency situations such as fires.
Solution:
◦ Pump type selection: Choose a vertical long shaft semi submersible fire turbine pump, which has the characteristics of high flow rate, high head, rapid start-up, and stable operation to meet the needs of ship fire protection systems.
◦ Drive mode: The pump set driven by diesel engine and right angle gearbox can solve the problem of inability to provide fire water supply in case of power shortage, ensuring the reliability of the fire protection system.
◦ Marine life prevention device: using electrolytic water pollution prevention method, electrolytic copper aluminum anode pollution prevention method, or electrolytic seawater and electrolytic copper aluminum combined anti fouling method, effectively preventing marine attached organisms from adhering to the pump filter screen and inlet, ensuring the normal operation of the equipment.
Heating device: In cold sea areas, to prevent ice formation inside the pump body, a heating device can be installed on the water lifting pipe near the water surface and at a certain distance below the water surface to ensure that the fire pump can be put into normal operation during the severe winter season.
4. Sewage discharge system
Application scenario: Ships generate a large amount of sewage during navigation, which needs to be efficiently and reliably discharged into designated areas.
Solution:
◦ Pump type selection: Choose a vertical long shaft semi submersible sewage collection pit pump, which has a wear-resistant design that can handle media containing particles and fibers, meeting the needs of ship sewage discharge systems.
Material selection: The overcurrent components are made of wear-resistant materials, such as high chromium cast iron or rubber lining, to extend the service life of the equipment.
Self lubrication design: The guide bearing relies on the conveying medium for self lubrication. For sand or corrosive media, an external clean water lubrication system can be configured to improve durability.
Intelligent monitoring: equipped with intelligent sensors, real-time monitoring of parameters such as vibration, wear, temperature, etc., to achieve full lifecycle management of equipment, supporting remote monitoring and early warning.
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2、 Overall solution
Material selection:
The overcurrent components of the vertical long shaft semi submersible turbine pump are made of various high-strength and corrosion-resistant materials such as 304/316/904L stainless steel, duplex steel, super duplex steel, nickel bronze, etc., ensuring long-term stable operation of the equipment in extreme environments.
For specific working conditions, such as areas with high sediment content, sand prevention structures can be used to avoid wear and tear on the pump caused by sand particles.
Structural design:
The vertical long axis semi submersible turbine pump adopts a layout of vertical suction inlet and horizontal outlet, with a direct motor drive, compact structure and small footprint.
The pump body is submerged in liquid during operation, effectively reducing the risk of cavitation and ensuring stable water absorption.
The impeller adopts a balance hole to balance the axial force, and the front and rear cover plates of the impeller are equipped with replaceable sealing rings to protect the impeller and guide vane body.
The central axis and lifting pipe are designed with multiple sections, connected by threaded couplings or sleeve couplings. The number of lifting pipes can be increased or decreased according to user needs to adapt to different underwater depths.
Sealing and lubrication:
Adopting a dual mechanical seal structure to prevent seawater from infiltrating the bearing box and prevent bearing corrosion and failure.
The guide bearing relies on self lubrication of the conveying medium. For sand or corrosive media, an external clean water lubrication system can be configured to improve durability.
When the installation plane of the pump is more than a certain distance away from the water surface, an oil lubricated closed shaft structure should be selected to solve problems such as sand protection and long shaft lubrication.
Intelligent control:
Equipped with an intelligent control cabinet to achieve functions such as automatic start stop, overload alarm, and remote monitoring based on liquid level, improving the automation level of equipment operation.
Some models are also equipped with intelligent sensors that can monitor real-time parameters such as vibration, wear, temperature, etc., achieving full lifecycle management of the equipment.
3、 Supporting optimization measures
Anti marine biological device:
The use of electrolytic water pollution prevention method, electrolytic copper aluminum anode pollution prevention method, or electrolytic seawater and electrolytic copper aluminum combined anti fouling method effectively prevents marine attached organisms from adhering to the vertical long axis semi submersible turbine pump filter screen and inlet, ensuring the normal operation of the equipment.
Heating device:
In cold sea areas, to prevent ice formation inside the pump body, a heating device can be installed on the lifting pipe near the water surface and at a certain distance below the water surface to ensure that the vertical long shaft semi submersible turbine pump can be put into operation normally in the harsh winter season.
Modular design:
Adopting modular design, the vertical long axis semi submersible turbine pump is more easily adapted to emerging scenarios such as distributed energy and sponge cities, continuously promoting the upgrading and iteration of infrastructure in multiple fields.
4、 Application Cases and Effects
Ocean platform seawater lifting system:
A certain offshore platform uses a vertical long axis semi submersible turbine pump for seawater lifting. The pump body is made of super duplex steel material and equipped with an intelligent control system and anti marine biological device. After the project was put into operation, the pump operated stably without obvious corrosion and wear problems, saving millions of yuan in maintenance costs every year.
Ship fire protection system:
A large ship adopts a vertical long shaft semi submersible fire turbine pump as the core equipment of the fire protection system. The pump body is made of corrosion-resistant materials, equipped with a dual mechanical seal structure and an intelligent control cabinet. In fire drills, pumps can quickly start and provide high flow water supply to meet the needs of the fire protection system.
Ship sewage discharge system:
A certain ship adopts a vertical long shaft semi submersible turbine pump for sewage discharge, and the pump body adopts wear-resistant design, which can handle media containing particles and fibers. After the project was put into operation, the efficiency of sewage discharge significantly improved, while reducing environmental pollution.