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Flowserve-Flowserve-Horizontal - Multistage - Double Case - WCC

Horizontal - Multistage - Double Case - WCC


The WCC is a between bearing, multistage, double case, diffuser style barrel pump designed for medium duty applications in the oil & gas, chemical process industry and general industry markets. With numerous units installed, the Flowserve WCC(D) medium duty multistage barrel pump is a unique member of the double-case barrel pump family. The operating window is set out for the standard product range; however Flowserve has numerous installations in excess of this range what would be considered as fully engineered hydraulics and pump package.


  • Chemicals
  • Oil & Gas
  • Power

industry sectors

  • Basic (Organic & Inorganic)
  • Specialty (Fine & Consumer)
  • Biofuels
  • Pharmaceutical
  • Upstream Exploration & Production
  • Midstream Transportation
  • Downstream Processing
  • Nuclear
  • Conventional Steam
  • Geothermal
  • Combined Cycle
  • ISO 13709 / API 610
  • Hydraulic Institute
  • Customer specifications
Operating Parameters
  • Flows to 1000 m3/hr (4400 gpm)
  • Heads up to 2800 m (9190 ft)
  • Pressure to 275 bar (4000 psi)
  • Temperature up to 425°C (800°F)
Design Range

Size Range: 4 Sizes (3” to 8”) with 18 available hydraulics

Features & Benefits

The WCC barrel is available as a casting with integral nozzles or a forging with weld on nozzles. The barrel is designed to suit service conditions with 10 incremental pressure steps. Suction flange and discharge flange can be rated to suit pump design pressure. The standard configuration is centre line mounted with Top/Top nozzles and is considered self venting therefore no vent connection is required. Alternative foot mounted option is available for low temperature applications and alternate nozzle configurations, like side/side, are available after engineering review.

Discharge Head
The discharge head consists of 2 configurations; - Conventional bolted head construction which combined with the center line mounted barrel allows for temperatures up to 425 ºC - Shear ring alternative for low temperature applications up to 120ºC with a foot mounted casing and optional nozzle orientation.

The complete inner cartridge consists of:

Precision cast Impellers of radial flow design. Individually dynamically balanced to G2.5 . Single suction first stage impellers on the smaller size and double suction is available on the bigger size types. Impellers are supplied with integral wear surfaces on the front and back hubs, overlay material shall be selected to suit the application, DLD is the preferred method for applying hard coating of super duplex materials. Optional renewable wear rings can be supplied and would be shrunk –on and positively fastened (pinned by means of axial grub screws) to the impeller to prevent rotation and axial movement. The standard rotor build is a stepped shaft design with shrink fit impellers individually keyed to the shaft. When required the impellers can be located to prevent axial movement in the reverse thrust direction by means of a split ring. The alternative precision fit rotor incorporates a stepped shaft and impellers individually keyed to the shaft , impellers are secured against axial movement in both directions by means of split rings.  

Stationary Wear Parts
Stationary wear parts consist of the front casing rings and back bushing rings. Stationary wear parts are shrunk and pinned ( axial grub screws) in the casing to prevent rotation. API 610 10th edition clearances are standard on the front ring with Flowserve standard clearances on the back bushing ring.

Diffuser/Channel Rings
Multi vane diffuser/ channel ring inter stage assemblies are used to balance radial loads throughout the pumps operating range. Low radius diffuser vanes ensure the shock – less transition of the fluid from impeller outlet to the impeller eye of the next stage, minimizing efficiency loss and undesirable pulsations. A metal to metal inter-stage fit prevents internal leakage and subsequent loss of performance. Designed for the optimum D5/D2 ratio to match the impeller specific speed, the compact design minimizes the barrel internal diameter and hence the overall size and weight of the pump.   Sleeves and bushings This product is provided with a balance device that balances the pressure between the inboard and outboard seal chambers and controls the axial thrust. The balance device is available as a straight drum (API 610 requirement) design or a flanged drum (clean liquids e.g boiler feed). Both drum and flanged drum options have Flowserve standard clearance, API clearance can be applied with a reduction of efficiency.

Sealing Chambers
Seal chambers meet API 682 requirements and are designed to accept single , double or tandem cartridge mechanical seal arrangements of all leading manufactures.



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