Model U
Multi-Stage Steam Turbine

The Dresser-Rand® Model U steam turbine was originally designed to meet the
harsh environment of the sugar industry where sudden changes in steam conditions and loads are common. The time-tested Model U turbine continues to meet the
most demanding mechanical drive needs for petroleum, petrochemical, sugar mills,
steel mills, waste-to-energy plants and other process industries that require drivers
for generators, pumps, compressors, fans, and blowers.

Casing Design
The unique above-centerline casing split allows the cover of the Model U turbine to
be removed for rotor and diaphragm inspection without disturbing the steam sealing
areas, or the inlet and exhaust connections. This design also allows 270 degrees of
admission from a single steam chest without a high-pressure horizontal joint.

Inlet Valves
The Model U turbine is designed with a single inlet valve with optional manual hand
valves for steam flow control, and a wide selection of optional governors and
accessories.

Overspeed Trip System
The overspeed trip system is a mechanical bolt action, non-sparking system operating an independent trip valve. A two-out-of-three electronic system with dual solenoid activation is available as needed.

Above center-line split
casing allows top cover to
be removed for rotor and
diaphragm inspections

Bronze labyrinth oil
seals with air purge

The independent trip valve can be a high-performance butterfly valve,
or a Dresser-Rand mechanical latch, or a Gimpel™
oil-operated trip and throttle valve.
Manual overspeed
trip knob

Non-sparking
overspeed trip

These valve types provide quickclose, positive shut-off of the steam
supply and comply with API 612
standards. The trip and throttle
valve can function as a manually
operated throttle valve for turbine
start-up or shut-down.

Pressure
lubrication

Dual-acting, hydrodynamic
tilt-pad bearing

Steel-backed,
babbitt-lined
journal bearings

Segmented carbon ring gland
separated by partitions of stainless
steel and interstage seals; optional
labyrinth seals available

Precision-ground, metal-tometal joings; eliminates need
for gaskets