Thetys Pumps SRL
Tel: +40 744 595 445
Str. Teheran, nr. 11, sector 1,
011931 Bucuresti, Romania

Because life is fluid.


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MD high-pressure stage casing pump – Thetys Pumps
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MD high-pressure stage casing pump

Thetys Pumps / Products  / Pumps  / Ring section pumps / MD high-pressure stage casing pump

MD high-pressure stage casing pump

Customized high-pressure pump with clever modular design

Both investment costs and lifecycle costs are taken into consideration when designing the optimal pump. An optimized hydraulic design guarantees maximum efficiency. M-series high-pressure stage casing pumps have a modular design. This allows Sulzer to find the most efficient solution to meet customer requirements, typically for feedwater pumps and start-up feedwater pumps for gas-fired combined-cycle power plants, among other applications.

Main benefits
  • Modular hydraulics for high efficiency in a wide range of operating conditions as required for gas-fired combined-cycle power plants
  • Optimized design for thermal conditions as applicable in gas-fired combined-cycle power plants
  • Centerline mounted with large branch sizes for optimized inlet flow, low noise level, and higher allowable forces and moments
  • Unaffected by rapid temperature variations and therewith highly suitable for gas-fired combined-cycle power plants where frequent start-stop operation is specified
  • Stiff shaft design for critical speeds above the maximum operating speed
  • Multiple screws mechanical tensioners are used on large sizes to allow simpler tightening and loosening
Main applications

The MD pumps are suitable for pumping clean or slightly polluted, hot or cold water. They have been specifically designed for application such as:

  • Main boiler feedwater pump in captive, independent, biomass, and industrial power plants
  • Main feedwater pump in gas-fired combined-cycle and concentrated solar power plants
  • Start-up boiler feedwater pump in utility thermal power plants
  • High-pressure water pump in general industry
Features and benefits
Cutaway of MD1. Casing support

Centerline mounting absorbs high forces and moments. Pre-warming not required

2. Impeller
  • Several hydraulic sets per pump size guarantee high efficiencies and low operating costs over a wide operating range
  •  Low Net Positive Suction Head Required (NPSHR) first stage; double suction first stage can be provided for selected sizes
3. Shaft

Transmits the required torque and minimizes deflection

4. Rotor design

Stacked rotor with staggered keyways to transmit torque

5. Intermediate take-off

Reduces head losses; large take-off flow is available on certain sizes

Operating data
50 Hz 60 Hz
Discharge sizes up to 200 mm up to 8 in
Capacities up to 1,200 m3/h up to 5,300 US gpm
Heads up to 2,800 m up to 9,200 ft
Suction pressures up to 50 bar up to 725 psi
Discharge pressures up to 350 bar up to 5,080 psi
Temperatures up to 210°C* up to 410°F*
Performance range

Performance range 50 Hz

Performance range 60 Hz

Pump part Material
Suction stage and discharge casings Chrome steel
Impellers Chrome steel
Shaft Chrome steel
Balancing system Chrome steel