Ultra long vertical multi-stage long shaft semi submersible  deep well turbine pump with ultra long shaft system structure and segmented support design as the core

The ultra long vertical multi-stage long shaft semi submersible deep well turbine pump is a "steel submersible" that can reach a depth of up to 400 meters underwater. It uses segmented stainless steel long shafts and titanium alloy pump casings, with a pressure resistance of 40MPa and a head of 450m, designed specifically for deep-sea mining and ultra deep oil and gas extraction.
The ultra long vertical multi-stage long shaft semi submersible deep well turbine pump is a depth conqueror for deep well mining, deep-sea engineering, and ultra deep liquid tank working conditions. With an ultra long shaft system structure and segmented support design as the core, it breaks through the conventional pump body immersion limit and becomes a "steel submersible" underwater up to 100 meters deep! Here is a hardcore analysis of its core features and applications:
Core structure
Ultra long shaft system design:
⊙ Segmented stainless steel long shaft (shaft length ≤ 120m, single section ≤ 6m, flange connection), suitable for deep well suction (such as oil reinjection, seabed mining).
The spacing between segmented guide bearings is ≤ 3m, equipped with wear-resistant shaft sleeves and lubricating water film, and the radial runout is ≤ 0.08mm/m.
Anti torsion material:
The shaft material is made of 316L stainless steel or titanium alloy (tensile strength ≥ 550MPa), which is resistant to seawater corrosion and high torque loads.
The impeller is made of duplex stainless steel 2205, which is resistant to chloride ion corrosion (Cl ⁻ ≤ 50000ppm).
High pressure sealing system:
Multi stage series mechanical seal (3-layer SiC sealing ring), pressure bearing ≥ 10MPa, leakage rate<0.1ml/h.
Inject anti scaling lubricating fluid (such as ethylene glycol solution) into the sealed chamber to prevent deep well high-temperature scaling.
Working mechanism
Multi stage head superposition:
The double suction impeller is used for segmented pressurization, and the fluid is gradually pressurized through the guide shell, resulting in a total head of up to 400m.
Anti bending and anti vibration control:
The damping system of the guide bearing absorbs the energy of the long axis swing, with an amplitude of ≤ 0.05mm (working condition at a water depth of 100m).
Deep sea adaptability:
Pump body pressure resistant shell design (pressure resistance ≥ 15MPa), suitable for underwater mineral extraction below 3000 meters.
Performance advantages
Characteristic parameters and description
Maximum immersion depth of 400m
Ultra high lift multi-stage impeller stacking lift of 45-450m, flow rate of 100-2000m ³/h
Deep sea pressure resistant titanium alloy pump casing with a pressure resistance of ≥ 30MPa (suitable for seabed manganese nodule mining)
Life guarantee: The life of the guide bearing is ≥ 15000 hours, and the maintenance free cycle of the whole machine is>1 year (deep-sea working conditions)
Typical applications
Energy extraction:
Enhancement of produced fluids from ultra deep oil and gas wells (media containing H ₂ S ≤ 20%).
Extraction of combustible ice from the seabed (temperature 2-4 ℃, pressure ≥ 20MPa).
Mining metallurgy:
⊙ Gold mine deep well drainage (well depth 120m, solid content 30%, pH 3-4).
⊙ Ultra deep backfilling of copper mine tailings pond (lift 200m, flow rate 500m ³/h).
Ocean Engineering:
Discharge of ballast water from deep-sea drilling platforms (with a salt content of 3.5% and particles ≤ 5mm).
⊙ Subsea pipeline cleaning (high-pressure water jet pressure ≥ 15MPa).
Key points of operation and maintenance:
⊙ Coaxial calibration: During installation, the coaxiality error of the segmented axis is ≤ 0.02mm/m, with laser calibration assistance.
Lubrication enhancement: Inject synthetic hydrocarbon deep-sea grease (NLGI grade 2) into the guide bearing every 1000 hours.
Fault warning: Equipped with fiber optic vibration sensors and AI diagnostic system to monitor the health status of the shaft system in real time.
⊙ Anti biological attachment: The surface of the deep-sea pump body is coated with a silicon-based anti fouling coating to inhibit the growth of barnacles and algae.