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

1. 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*