ST STI Serie



The ST-STI 6″ Constructive Series are multicellular submerged centrifugal electric well pumps for domestic, industrial, irrigation and pressurised water installations by means of hydraulic accumulators.

  • They are designed for the extraction of water from deep wells and reduced drilling diameter.
  • Its modular composition is formed by the hydraulic pump, and the submersible electric motor, which is coupled to the bottom of the pump.
  • They can work vertically or horizontally (with cooling bell).
  • The pump is supported by the tubes of columna´, which expel the water to the outside.
  • Pumps cannot run dry
  • Maximum liquid temperature 30º
  • Maximum sand 50 gr/m3
  • Built-in check valve.
  • The powers vary from 2 to 40 hp in three-phase to 220, 380, 400, 415 volts and from 2 to 3 hp in single-phase.

The installations of the series consist of three parts:

1- Hydraulic body

  • The hydraulic body is made up of a suction body, a discharge body, and stages or phases, made up of closed multi-channel axial type diffuser and impeller bodies.
  • The different stages are cased in a stainless steel casing that guarantees a high resistance to the whole pump and avoids possible deformations.
  • The diameter of the group is 6″.
  • The set of impellers driven by the central shaft that transmits the power of the motor.

2- Submersible electric motor

  • Electric submersible motor of 50 or 60 Hz with IP-68 protection that supports the axial thrust of the pump, by means of a widely dimensioned axial bearing.
  • The stator winding is flooded in oil or water, the bearings are lubricated by the internal liquid, and require no maintenance.
  • These engines are manufactured by the most prestigious specialized firms.
  • The coupling flanges are designed in accordance with NEMA standards, simplifying maintenance and repair operations.

3- Hydraulic column

  • The hydraulic column is made up of sections, depending on the depth of the well. These sections can be formed by normal commercial piping or by steel flanged piping.


  • Water supply and distribution.
  • Overpressure systems
  • Water treatment at wastewater treatment plants
  • Irrigation and sprinkler systems
  • Cooling towers
  • Chemical industries
  • Sanitary and cleaning facilities.
  • Industry in general
  • Ornamental fountains
  • Air Conditioning Installations
  • Washing systems
  • Fire-fighting installations


Aspiration body GG-25
Drive body GG-25
Diffuser body NORYL
Rodete NORYL





Submersible motors IP68 in water or oil bath Optional AISI 316



6″ Multicellular Submerged Centrifugal Electric Pumps for deep wells





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