Siemens Steam Turbines

Flexible, reliable and robust

General Information

Description
Output Overview

Siemens offers a comprehensive range of steam turbines from 45 kW to 1,900 MW, with the flexibility to address the specific requirements of your particular application. With over a century of experience and continuous development in steam turbine technology, Siemens has stayed at the forefront of development and is a prime partner for your business.

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Product Information

Steam Turbine SST-400 (up to 65 MW)

Description
Technical Data
Benefits
Design Concept
Package
Service

The SST-400 is a single casing steam turbine, providing geared drive to 1,500 or 1,800 rpm generators. It has a power output up to 65 MW. The modular package design allows a wide variety of configurations to satisfy the industrial customer's individual needs in the most economical way. The utilization of selected proven components assures high reliability and easy maintenance.

Typical applications of the SST-400 include:

Industrial power plants, e.g. captive power plants in the chemical industry, sugar industry, textile industry, in pulp and paper mills, steel works, mines
Waste heat recovery in different industries, e.g., from chemical processes
Cogeneration and district heating plants
Concentrated Solar Power (CSP) plants
Biomass plants, waste to energy, e.g. waste incinerators,
Combined cycle power plant
Geothermal power plants (SST-400 GEO)

SST-400 GEO

The SST-400 GEO is a derivative of the SST-400 turbine, optimized for the harsh conditions of geothermal steam cycles. The SST-400 GEO is used in geothermal applications with superheated direct steam, flash or combined cycle, offering an outstanding reliability, flexibility and economy of operation.

The SST-400 GEO combines the proven turbine casing of the Siemens turbine as well as the steam turboset accessories (gears, generator, base frame) with the geothermal steam path and moisture removal features of the TurboCare Magma turbine family.

Joint development between Siemens and the steam turbine service provider TurboCare
Optimized for harsh conditions of geothermal steam cycles
Used in applications with superheated direct steam, flash or geothermal combined cycle,
Offers outstanding reliability, flexibility and economy of operation

SST-400 Technical Data

Power output	50 or 60 Hz, up to 65 MW
Speed range	3000-8000 rpm
Live steam conditions
Pressure	up to 140 bar / 2030 psi
Temperature	up to 540°C / 1004°F
Hot reheat conditions
Pressure	up to 30 bar / 435 psi
Temperature	up to 450°C / 842°F
Bleed	up to 60 bar / 870 psi
Controlled extraction
Pressure	up to 45 bar
Temperature	up to 450°C / 842°F
Exhaust steam conditions
Back pressure	up to 25 bar / 363 psi
District heating	up to 3 bar / 43 psi
Condensing	up to 0.6 bar / 8.7 psi

All data are approximate and project-related.

SST-400 GEO Technical Data

Power output
Condensing	50 or 60 Hz, 5-55 MW
Non-condensing	50 or 60 Hz, 5-60 MW
Speed range	3000-6000 rpm
Live steam conditions
Pressure	up to 12 bar / 175 psi
Temperature	up to 250°C / 482°F
Exhaust steam conditions
Condensing	up to 0.4 bar / 5.8 psi
Non-condensing	up to 1.4 bar / 20 psi

Fast and early layout planning
Short delivery time due to extensive pre-design
Compact design minimizes space requirements of installation
Easy access to mechanical components facilitates maintenance
Remote control for simple operation

Proven installation and maintenance concept lowers maintenance costs
Comprehensive spare-part service, repairs and maintenance solutions designed to increase reliability and availability of plants
Prepared for remote monitoring

SST-400 GEO

Proven geothermal steam path for optimized reliability with low steam parameters
Package solution for faster installation and commissioning
Advanced highly effective moisture removal techniques
Ease of maintenance due to inlets in casing lower half
Special material selection to meet geothermal specific steam chemistry
12 Cr diaphragms and 2% Cr integral forged rotor(12% Cr optional) to resist corrosion attacks and corrosion- assisted fatigue cracking

Single casing steam turbine with geared drive
Compact, base frame mounted design
Proven, modular and thermoflexible design
Customized steam path
Design for back pressure or condensing applications

Operational Flexibility

Back pressure or condensing operation with up to two internally controlled extractions and possibility of several bleeds allow the selection of optimal solutions for the majority of industrial applications. The design of the exhaust blades allows large exhaust areas with high thermodynamic efficiency and reliability. The blading design guarantees high efficiency, giving the customer highly flexible plant operation. The symmetrical casing design with horizontal joint flange allows short start-up times and rapid load changes.

SST-400 GEO

The SST-400 GEO turbine combines the proven turbine casing of the Siemens SST-400 as well as the steam turboset accessories (gears, generator, base frame) with the geothermal steam path and moisture removal features of the TurboCare Magma turbine family.

High performance butterfly control and trip valves are designed for demanding geothermal steam environment. These components are an integral part of the control, monitoring and safety system that utilize the operator friendly SIMATIC S7 that easily interfaces with plant DCS.

These systems have been designed to meet the demanding EC and international safety standards and leverage the strength of Siemens and TurboCare.

Robust impulse design and generous clearances result in sustained efficiency and high reliability
Proven geothermal steam path
Low profile axial exhaust
Advanced highly effective moisture removal techniques
Special material selection
Modern dovetail blades that reduce peak stress and resist stress corrosion cracking
Laser applied stellite alloy blades on last stage

The SST-400 single casing, modular package design allows a wide variety of configurations to satisfy individual customer needs in the most economical way. The SST-400 series can be equipped with upward, downward or axial exhaust orientation to fit with the selected installation. The turbine base frame can be combined with standardized gearbox-oil units and four pole generators to a turboset. The turbine base frame and gearbox / oil unit are fully assembled in the workshop before being shipped to the site.