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Siemens DR SST 500 700 is a Dresser-Rand Single Stage Steam Turbine that compliant with API 611 and API 612. This rugged steam turbine is reliable mechanical drive and economical for lube oil pumps, process pumps, feedwater pumps, fans, compressors, generators as specified by the petrochemical, food processing, refining, steel, and other industries.

The steam turbine has the specialty of horizontal Axial Split Casing, Overspeed Trip System, Trip and Throttle Valve (Optional), Governors, Rotors, Bearings, and Seals. The upper half of the casing it can be removed with the axial split design for easier access to internal parts inspection and replacement. The casing design is a sturdy metal-to-metal joint sealing casing that meets the NEMA stress level standards-compliant with API 612 requirements and ASME section VIII.

The SST safety valve and trip system work independently of the governor. They use a piloted venturi-type mechanical trip valve and provide positive closure to shut off the steams from flowing to the turbine in the event of over speed. The valve can be reset against full steam pressure.

The trip and throttle valve function as a quick-closing valve (manual or automatic) that is actuated by the Overspeed governor, a mechanical safety trip, or the optional electronic trip actuators. It is also a method to manually operate the throttle valve to accelerate the steam turbine up to speed (standard supply on SST 700LP). Select from a Dresser-Rand Gimpel™ oil- operated trip and throttle valve or a Dresser-Rand mechanical trip and throttle valve.

The Woodward Class A TG governor is standard equipment on all SST models as a self-contained, hydraulic-powered governor for high output and accurate speed control. Alternate governing systems can be supplied to the client based on request or according to the necessity of operating conditions.

In order to prevent wheel movement relative to the shaft throughout the steam turbine speed range, two rows of single-disc, Curtis forged wheels are shrunk and keyed to the shaft. For high-speed applications, solid rotor designs are available as an option. For easy access and replacement, journal bearings are split at the horizontal centerline without removing the rotor. To improve its operating life bearings are bronze-backed and babbitt-lined and optional pressure lubrication or standard oil ring can be used if necessary. Anti-friction ball bearings are inserted for oil mist lubrication specificated area and quick start applications.

Siemens DR MST R is the Dresser-Rand Model R multi-stage steam turbine that is versatile, API 612-compliant turbine engineered to meet demanding applications up to 25,000 kW. The multi-stage Model R turbine is designed to drive generators for independent power plants, compressors and other mechanical equipment for industrial processing and institutional power plants. These efficient steam turbines also are used in food processing, ethanol, waste-to-energy, and biomass applications. It has the special feature of casing design, Overspeed trip system, governors, multi-valve inlets, single-valve inlets, Rotors, seals, and bearings.

Casing splits (horizontal or vertical) are precision-ground with metal-to-metal joints, eliminating the need for gaskets. Casings conform to ASME Section VIII standards and NEMA standards for allowable stress levels; each section of the turbine casing is hydrostatically tested to meet API 612 requirements. Exhaust orientation is available in up, down, side, or axial configurations in condensing or non-condensing designs.

The Overspeed trip system is a two-out-of-three electronic system with dual solenoid activation of an independent trip-and-throttle valve. The trip-and-throttle valve functions as a quick-closing valve (manual or automatic) using electronic trip actuators. It also functions as a manually operated throttle valve for bringing the steam turbine up to speed. Choose from a D-R mechanical trip and-throttle valve or a Dresser-Rand Gimpel® oil-operated trip-and-throttle valve.

The Model R turbine is typically supplied with an electronic governor control system. It provides tight control of speed (NEMA D) and includes an input for a 4-20 mA remote speed control signal that can be used for a process generated input to control the speed setting. Other features include dual-speed control dynamics and Overspeed trip test capabilities. The Model R turbine is available with multiple- governor-controlled inlet valves that optimize the steam turbine’s performance throughout the operating range.

Multi-inlet valves are opened and closed in sequence by the turbine governor controlling the flow of steam to separate groups of nozzles. These valves are opened and closed to minimize losses at partial loads and are able to maintain higher efficiencies to be maintained under all load conditions. Dresser-Rand recommends multi-valve construction for turbines driving synchronous generators that are paralleled with other generators or a utility.

The Model R turbine is also available with single-valve governor-controlled inlets, with manual or solenoid operated load valves. When multi-valve governing control is not a functional requirement, the single-valve option provides a lower cost construction and maintains acceptable control for multiple load points. This configuration is often preferred for smaller mechanical drive and power generation units.

Rotors are available in a forged or built-up design with a flexible or stiff shaft for up to 15 stages. Labyrinth gland or inter-stage steam seals are provided to accommodate operating conditions or client preference. Labyrinth-type oil seals retain pressure-fed lubrication in the bearing housings and prevent contamination from foreign material. Steam slingers also protect bearing housings from steam and condensate. The Model R turbine incorporates a dual-acting, hydrodynamic, tilting pad thrust-bearing to position the rotor axially and absorb internal thrust; spherically seated or tilting pad-type journal bearings are standard. Exhaust- and steam-end bearing covers allow easy access to the bearing housing without removing the casing cover.

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