Multi-stage rotodynamic pumps

Multi-stage rotodynamic WH pumps

The WH series pumps are centrifugal, multi-stage horizontal pumps with ring sections with closed impellers and centrifugal-centripetal stators. The WH pumps are designed for pumping clean or slightly polluted liquids (maximum content of impurities – 100 mg/dm3o for the WHA type pumps and traces of non-abrasive particle content for the WHI, WHS and WHG) with temperatures of up to 140oC, within the resistance range of the materials used for their construction.

Application

  • Power industry – boiler feedwater, hot water, condensate,
  • Industrial, pressure boosting and fire-fighting systems,
  • Utility, municipal and drinking water systems,
  • Distillate, solvents, fuels (including LPG) pumping stations,
  • Filtration and reverse osmosis systems,
  • Irrigation and snow-making systems,
  • High pressure car washes.

Advantages:

  • High efficiency,
  • Good anti-cavitation properties,
  • Variety of material versions,
  • Ability of liquid self-priming (WHS, WHG)
  • Simple design,
  • Possibility of changing the angle of the suction flange,
  • Application of shaſt protection sleeves and replaceable wear rings.

TECHNICAL DATA

  • Capacity Q: up to 700 m3/h
  • Delivery head* H: up to 700 m
  • Temperature of pumped liquid* t: up to 140oC (150oC)
  • Ambient temperature: up to 40oC
  • Maximum pressure in housing*: 75 bar
  • Maximum supply pressure*: 15 bar
* Concerns selected constructions

WHA/WHP pumps - general application

The WHA/WHP pumps are horizontal multistage pumps with a self-priming member, designed for pumping water at temperatures of up to 140oC and liquid fuels and other liquids within the range of resistance of the materials used for their construction. In the WHA/WHP pumps the discharge flange is directed upwards, when the suction flange can be set as desired every 90o. The first stage of the pump is equipped with a special impeller with increased anti cavitation properties. The impellers of the WHA/WHP pumps are sealed with replaceable wear rings. The shaſt is protected with protective sleeves and sealed with gland packing or front mechanical sealing. High pressure in the discharge gland is reduced with a special pressure stuffing system, which reduces substantially the sealing load.

WHS pumps - with self-priming member

The WHS pumps are horizontal multistage pumps with a self-priming member, designed for pumping water at temperatures of up to 80oC and liquid fuels and other liquids within the range of resistance of the materials used for their construction. The WHS pumps are the special development of the WHA pump, in which aſter the last stage an additional circulation-vacuum member was applied. The ability of self-priming is executed by the circulation member with side channels and an open impeller, which sucks gas from the inlet space of the centrifugal impeller of the last stage via unloading holes and pumps it directly to the discharge casing. This solution enables suction of the gas from the working space of the pump and the suction installation, resulting in lack of the need for application of additional priming systems. The WHS pump sucks by itself the liquid from the tank located below the pump axis, provided its previous priming.

WHI pumps - with an initial impeller with lowered NPSH

A pump of general purpose, adapted to pump a medium in temperature up to 140oC within the resistance range of the materials used for its construction with increased suction properties (with lowered NPSH). The pump is provided with an additional initial axial impeller mounted before the centrifugal impeller of the first stage in the suction casing with the axial inlet, which results in the fact that the required anti-cavitation NPSH surplus of the WHI pump is lower than for the WHA pump.

WHG pumps - with the self-priming member and the initial impeller

A self-priming pump, adapted to pumping of the medium with temperatures of up to 80oC within the resistance range of the material used for its construction, with increased suction properties (with lowered NPSH). The WHG pump sucks by itself the liquid from the tank located below the pump axis, provided its previous priming. The ability of self-priming is performed identically as in the WHS pump. The WHG pump is provided with an additional initial axial impeller mounted before the centrifugal impeller of the first stage in the suction casing and with the axial inlet, which results in the fact that the required anti cavitation NPSH surplus is lower than for the WHA and WHS pumps.
  • The impeller separates the gas from the liquid due to centrifugal force.
  • The self-priming member sucks the gas through relief holes and pumps it into the discharge body.
  • The barrier liquid is held in the centrifugal guide and spiral body due to:
    • from inflow acts the centrifugal force of the rotor,
    • from the discharge acts the gas pressure generated in the self-priming member

Principle of operation of the self-priming stage:

Pole pracy

Hydro-Vacuum S.A. Pump Selection Progam.

Quick and simple online tool for pump selection based on set criteria.

Thanks to the PDP, by means of the "Hydraulic Selection" function, specific pumps can be selected by configuring, among other things, the area of application, pump type, pump design, medium to be pumped, operating point, etc. Alternatively, by using the "Product Catalogue", you can conveniently browse through the pump catalogue which is Hydro-Vacuum S.A. 's production offer.

The result of the selection is a data sheet for the pump containing all the necessary hydraulic (characteristics), electrical, material, construction, dimensional, etc. data.

The first thing to do is to register a new account. After entering some necessary data and approving the form, an activation link will be sent to the e-mail address provided. After clicking on the link, you will be able to make full use of the Hydro-Vacuum S.A. Pump Selection Software.

We encourage you to create an account and try our program.
Technical assistance in the operation of the program tel. 56 45 07 545 (working days 7:00-15:00)

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