What are the vertical multi-stage semi submersible long shaft mixed flow turbine pumps used for ultra deep working conditions with ultra long underwater depths?

The vertical multi-stage semi submersible long shaft mixed flow turbine pump is suitable for ultra deep working conditions with a depth of more than 10 meters and a maximum of 300 meters underwater, especially in scenarios such as power plant circulating water systems, large mine drainage, deep well water intake, urban water diversion projects, and offshore platforms. Its segmented long shaft structure and multi-stage support design can effectively cope with vibration, deflection, and sealing challenges in deep underwater environments.
1、 Applicable underwater depth range and structural adaptability
The vertical multi-stage semi submersible long shaft mixed flow turbine pump, through modular design, can flexibly adjust the submerged length according to actual working conditions to meet different depth requirements:
·Conventional depth: 10-30 meters, suitable for urban water supply pumping stations, sewage treatment plants, etc;
·Medium depth: 30-100 meters, commonly found in swirl wells in steel plants and large water intake pump stations in reservoirs;
·Ultra deep working conditions: 100-300 meters, dedicated to extreme environments such as deep well water intake, underwater pipeline cleaning, and deep mine drainage.
The intermediate shaft, lifting pipe, and protective pipe of the pump are designed with multiple sections, connected by threaded couplings or sleeve couplings. The number of sections can be increased or decreased according to user needs, and can be flexibly adapted to different underwater depths. For example, Lijia Machinery's submersible long shaft pump can reach a maximum depth of 400 meters and is widely used in metal mines, oil wells, mines, offshore platforms, and other projects.
2、 Typical application scenarios for ultra deep working conditions
1. Power plant circulating water system
·Underwater depth: 20-60 meters
·Characteristics of operating conditions: high flow rate, continuous operation, medium of seawater or freshwater
·Technical matching: The LVG series vertical multi-stage semi submersible long shaft mixed flow turbine pump from HUNAN PERFECT industry in China is suitable for use as a circulating pump in power plants, with a flow range of 1-25000m ³/h and support for customized processing.
2. Mine deep well drainage
·Underwater depth: 100-120 meters
·Characteristics of working conditions: high head, high solid content, strong corrosiveness
·Technical matching: Adopting a multi-stage impeller series structure to increase the total head to over 250 meters; The impeller is made of duplex stainless steel or wear-resistant coating to extend its service life.
3. Urban water intake and reservoir water intake
·Underwater depth: 30-80 meters
·Characteristics of working conditions: complex water quality, large seasonal water level changes
·Technical matching: equipped with float type installation structure or adjustable bracket to adapt to water level fluctuations; Immersion operation of the pump body, no need to pump, easy to start.
4. Marine engineering and ship water intake
·Underwater depth: 10-50 meters
·Working condition characteristics: The medium is seawater, with strong corrosion and high risk of biological attachment
·Technical matching: The pump body is made of 316L stainless steel or titanium alloy, and the sealing system is equipped with a double end mechanical seal to prevent seawater from infiltrating the motor.
5. Deep well agricultural irrigation
·Underwater depth: 50-150 meters
·Characteristics of operating conditions: Long term operation, difficult maintenance
·Technical matching: using externally lubricated sliding bearings to reduce wear; Optional intelligent monitoring system to achieve remote fault warning.
3、 Technological advantages support the stability of ultra deep operation
·Multi point support system: A guide bearing is installed every 3-5 meters to effectively control the radial runout of the shaft system, suppress vibration, and ensure the smooth operation of the long shaft at a depth of hundreds of meters.
·Pump design without filling: The impeller is always immersed in the liquid, and there is no need to exhaust when starting, avoiding cavitation problems, especially suitable for closed containers or deep well environments.
·Corrosion resistant and wear-resistant design: For seawater, sewage, sand containing media, etc., fluoroplastic lining, ceramic coating or duplex steel materials are used to improve the service life of the pump body.
·Customizable service: Supports customizing pump types based on parameters such as medium type, particle size, and specific gravity. For example, when transporting sewage, the maximum particle size and sewage specific gravity need to be provided.