Marelli VS4 vertical inline shaft sump pump

Designed for processes engineers requiring reliable operation in the full range of high pressure services

The Marelli VSMK VS4 type sump pump series are vertical process pumps, single volute, radial split, self-venting, vertical split casing and single stage.  Developed for the medium-pressure movement of water, hydrocarbon, CO2 and other process liquids, our solutions meet the most stringent customer specifications.

  • Flows to 7,000 gpm (1,600 m³/hr)
  • Heads to 1,180 ft (360 m)
  • Suction Pressure: Flooded
  • Temperature Range -22 to 752°F (-30 to 400°C)


  • Refineries
  • Desalination plants
  • Process charge
  • API basins
  • Condensate extraction
  • Tank farms
  • Tanks fluid transfer
  • Petrochemical plants
  • Fertilizers
  • Oil fields and terminals
  • Offshore and onshore petroleum and gas
  • Reverse osmosis
  • Synfuels
  • Paper mills
  • Pharmaceutical industry

Marelli has more than 50 years of experience in centrifugal pump design, development, manufacturing and service, to fulfill the latest standards for the petroleum, petrochemical, and heavy duty processing industries.

  • Fully compliant API-610 11th Edition/ISO 13709
  • All VS4 series pumps are suitable for 50 Hz and 60 Hz operation
  • Higher efficiencies
  • Labyrinth bearing seals to avoid external contamination and maximize seal/lubrication life
  • API-682, 3rd edition mechanical seal chamber.  Also complies with API-610 standards
  • Choice of multiple impellers in each hydraulic pump casing for optimum efficiency
  • Instrumentation options available

US 60 Hz

  • Heads to                                                  1,180 ft
  • Flows to                                                   7,000 gpm
  • Standards                                               API 610 VS4
  • Maximum Motor Power                           939 HP
  • Temperature Range                                -22 to 752°F
  • Maximum Case Working Pressure          580 psi
  • Maximum Suction Pressure                    Flooded
  • Differential Head                                      820 ft
  • Maximum Viscosity                              Consult Factory
  • Mounting Configuration                    Submersible Vertical
  • Seal Configurations                                 API 682

Metric 50 Hz

  • Heads to                                                  360 m
  • Flows to                                                   1,600 m3/hr
  • Standards                                                ISO 13709
  • Maximum Motor Power                           700 kW
  • Temperature Range                                -30 to 400°C
  • Maximum Case Working Pressure         40 bar
  • Maximum Suction Pressure                 Flooded
  • Differential Head                                      250 m
  • Maximum Viscosity                                 Consult factory
  • Mounting Configuration                     Submersible Vertical
  • Seal Configurations                                 API 682
Pressure CasingCarbon Steel (A216 WCB)12% CHR316 AUSDuplex
ImpellerCast IronCarbon Steel12% CHR316 AUS12% CHR316 AUSDuplex
Wear RingsCast Iron12% CHR HardenedHard-faced 316 AUS12% CHR HardenedHard-faced 316 AUSHard-faced Duplex
ShaftCarbon SteelAISI 4140316 AUS12% CHR316 AUSDuplex
Bearing HousingCarbon Steel (A216 WCB)
Base GasketAUS, Spiral Wound316 AUS Spiral WoundAUS, Spiral Wound316 AUS, Spiral WoundDuplex SS Spiral Wound

About Sundyne

Sundyne is the world leader in delivering low-flow, high-head, integrally geared centrifugal pumps and compressors, sealless magnetic drive pumps and diaphragm gas compressors. Sundyne’s precision-engineered, highly reliable, safe & efficient pumps and compressors are used in chemical, petrochemical, hydrocarbon, hydrogen, pharmaceutical and industrial applications. Sundyne pumps and compressors are also available in API, ANSI/ASME, ISO, and other industry compliant designs.