Vertical long axis semi submersible multi-stage deep well turbine pump application solution for marine engineering industry

The vertical long axis semi submersible multi-stage deep well turbine pump is a core water intake equipment in the field of ocean engineering. Through corrosion-resistant material optimization and special structural customization, it can fully adapt to the harsh working conditions of high corrosion and high sediment concentration in the ocean.
1、 Marine engineering scene
1. Water supply for offshore platform operations: Vertical long axis semi submersible multi-stage deep well turbine pumps provide production cooling water and domestic water for extracting seawater from drilling equipment, generator sets, and living facilities on the platform. They are known as the "blood" of offshore platforms and require long-term stable and continuous operation to withstand high salt corrosion and wave impact.
In response to the operational water supply needs of offshore oil and gas platforms, a seawater circulation pump scheme using a vertical long shaft semi submersible multi-stage deep well turbine pump is adopted. The metal components of the pump are made of duplex stainless steel or super duplex stainless steel, suitable for marine salt spray corrosion environment; Some models are equipped with adjustable blade structures, which can adjust the blade angle according to the water usage conditions of the platform, achieving energy-saving operation. At the same time, the motor adopts explosion-proof design to meet the explosion-proof safety requirements of offshore platforms.
2. Marine engineering construction assistance: underwater trench excavation, pipeline laying assistance, marine engineering construction drainage, marine engineering material transportation, etc
In construction scenarios such as underwater trench excavation and pipeline laying, high lift vertical long axis semi submersible multi-stage deep well turbine pumps are selected. This pump can overcome the pressure of deep-sea seawater and provide sufficient outlet pressure to complete seabed excavation operations; In response to the limited power supply of offshore operation platforms, diesel engines can be used as a power source to ensure the continuity of construction.
The specific applications of vertical long shaft pumps in auxiliary scenarios of marine engineering construction include the following categories:
Subsea trench excavation and pipeline laying assistance
Provide sufficient hydraulic support for the excavation of underwater trenches, overcome the pressure of deep-sea seawater, and ensure the smooth progress of the preliminary construction of underwater pipeline laying. In response to the limited power supply of offshore work platforms, diesel engines can be used as a power source to ensure construction continuity.
The use of high lift vertical long axis semi submersible multi-stage deep well turbine pumps can overcome the pressure of deep-sea seawater, provide sufficient hydraulic support for underwater trench excavation operations, and ensure the smooth progress of the early construction of underwater pipeline laying. In response to the limited power supply of offshore work platforms, diesel engines can be used as a power source to ensure construction continuity.
Supporting facilities for offshore platform construction
Provide stable seawater cooling and operational water supply for construction equipment on offshore platforms, ensuring stable operation of platform construction equipment in high temperature and high humidity marine environments. Adopting a corrosion-resistant vertical long shaft semi submersible multi-stage deep well turbine pump, the core components of the pump are made of duplex stainless steel material, which can resist the corrosion and wear of salt and impurities in seawater.
Marine engineering construction drainage
In the process of marine engineering construction, large flow vertical long shaft pumps can be used to quickly pump out accumulated water in the construction area, solving the problem of accumulated water in the construction area and ensuring construction progress. The pump is equipped with an intelligent control cabinet that can automatically start and stop according to the accumulated water level, achieving efficient unmanned drainage.
Marine engineering material transportation
In the material transportation process of ocean engineering, vertical long shaft pumps can be used to transport media containing solid particles, corrosive substances, etc. For such working conditions, the core components of the pump will be made of wear-resistant and corrosion-resistant materials, and the sealing structure will be optimized to prevent medium leakage and ensure the stability and safety of material transportation.
3. Marine platform fire protection water supply: The marine platform fire protection system is an important facility to ensure the safety of offshore platforms. Its specific composition can be divided into several modules: basic support, power transmission, fire monitoring, fire extinguishing execution, and emergency assistance. As the core water supply pump of the fire protection system, it requires high flow and high pressure water supply to meet the platform's fire emergency needs, requiring fast response and high reliability.
Ocean platforms have limited space, harsh environments, and are far from land, requiring extremely high reliability, corrosion resistance, and high flow transmission capacity for firefighting equipment. Vertical long shaft pumps are suitable for such scenarios based on the following characteristics:
Ultra long water intake capacity: The main shaft can reach up to 40m in length, allowing for deep water intake into seawater, solving the problem of long water intake distances on offshore platforms.
Strong environmental adaptability: The core components are made of corrosion-resistant materials such as super duplex steel, combined with filter screens and dosing devices, which can resist seawater corrosion and prevent the attachment of marine organisms; It is also equipped with a heating device to prevent seawater from freezing inside the external pipe during winter.
High reliability design: equipped with anti reverse device, the electric motor type is set on the pump body, and the diesel type is set on the right angle gearbox to prevent the pump shaft from rotating in the opposite direction after stopping, ensuring equipment safety.
Select a mining explosion-proof type (suitable for marine explosion-proof environment) high flow and high lift vertical long shaft semi submersible multi-stage deep well turbine pump, take water from the platform seawater pool, and supply water to the fire protection system. The exposed parts of the pump are prohibited from using copper materials to prevent sparks from impact. At the same time, an intelligent control cabinet is equipped, which can automatically start and stop according to the liquid level and trigger overload alarms, achieving unmanned fire water supply guarantee.
4. Port and dock ship water supply/drainage: Provide fresh water supply and transportation for docked ships, pump out accumulated water in low-lying areas of the port, and adapt to tidal water level changes and salt spray corrosion environments.
Ship water supply
It can provide domestic and industrial water for ships docking at the dock, and some special ships can also provide fire-fighting water. For the scenario of seawater intake, the vertical long axis semi submersible multi-stage deep well turbine pump can deeply extract water underwater, meet the demand for high flow water supply, and adapt to the water supply conditions of ports and docks.
Ship Drainage
• Cabin ballast water adjustment: helps ships quickly adjust ballast water, ensuring the stability and safety of ship navigation.
Dock front drainage: Timely discharge the accumulated water in the dock front area to avoid affecting ship berthing, loading and unloading operations, and to prevent erosion of dock facilities caused by accumulated water.
• Adapt to the characteristics of port terminals
1. Strong environmental adaptability
The core components of vertical long axis semi submersible multi-stage deep well turbine pumps are mostly made of duplex stainless steel material, which can resist the corrosion of seawater and can also be equipped with anti marine biological devices to prevent the attachment of marine organisms from affecting the operation of the pump; Some pump models are equipped with heaters, which can solve the problem of seawater freezing inside the external pipe in winter, and also have the ability to resist wave impact, adapting to the complex marine environment of ports.
2. Adaptation to high flow and flexible working conditions
The vertical long axis semi submersible multi-stage deep well turbine pump has a flow range covering 30-70000m ³/h and a head range of 4-400m, which can match the water supply and drainage needs of ports of different sizes and different types of ships; Some specially designed pump types can transport medium temperatures up to 150 ℃, and can also handle working conditions with large flow fluctuations, resist tilting and swaying, and adapt to the dynamic characteristics of ships.
3. Efficient and reliable operation
High pump efficiency can reduce operating costs; Reasonable structural design, convenient assembly and disassembly, easy maintenance and repair, ensuring the continuity of port and dock operations; Some pump models are equipped with intelligent control devices that can automatically start and stop according to water level, achieving efficient operation without human supervision.
 
2、 Targeted solutions for ocean engineering scenarios
Customization of fully corrosion-resistant materials: The overcurrent components (pump body, impeller, shaft) of the vertical long shaft semi submersible multi-stage deep well turbine pump that come into contact with seawater are all made of super duplex steel (2205/2507 material), which has much better resistance to intergranular corrosion and pore corrosion than ordinary stainless steel, and can resist long-term seawater corrosion. Its service life is more than three times that of ordinary stainless steel pumps.
Sand prevention structure upgrade: The pump body is equipped with a built-in sand throwing ring and a special anti sand motor, which can adapt to sand laden seawater environments up to 350g/m ³ (far higher than the industry standard of 50g/m ³), greatly reducing the wear of sand particles on the shaft and bearings.
Optimization of installation structure: Adopting a vertical long axis semi submersible multi-stage deep well turbine pump installation method with an external casing, it offsets the impact of waves on the cantilever installation pump body, and facilitates the installation of anti marine biological devices at the pump inlet. By controlling the concentration of sodium hypochlorite/copper ions, it prevents marine organisms from adhering to and blocking the filter screen.
Lubrication adaptation to deep working conditions: When the installation plane of the vertical long shaft semi submersible multi-stage deep well turbine pump is more than 15.3 meters away from the sea surface, an oil lubricated closed shaft structure is selected: the pump shaft and bearings are completely sealed in the protective tube, completely isolated from seawater, and the lubricating oil continuously lubricates the long shaft, solving the problems of long shaft lubrication and sand wear prevention under deep water level.