RLHA Single-Stage Steam Turbine Flier0 pages
RLHA
Single-Stage Steam Turbine
The API 611 compliant RLHA is a sturdy, versatile mechanical drive steam turbine for
applications up to 2,500 HP (1,865kW). It’s routinely specified by refineries, petrochemical plants, sugar mills, food processing and other industries using steam for process to drive lube oil pumps, feed water pumps, process pumps, fans, compressors,
and generators.
Axial Split Casing
The axial split construction of the RLHA steam turbine allows the upper half of the
casing to be removed for easy access to internal components for inspection and maintenance. The bearings can be inspected and replaced independent of each other and
without removing the casing cover.
Overspeed Trip System
The overspeed trip actuating mechanism is a bolt-type, spring-restrained weight, positioned on the turbine shaft. At a pre-selected speed the bolt is released to unlatch the
overspeed trip valve and completely stop the turbine.
The overspeed trip valve is a force-actuated, single-seated, piloted positive shutoff
independent of the governor valve. It’s designed to minimize pressure drop in the open
position and to instantly shut off steam when tripped by the overspeed trip mechanism,
optional electronic trip actuators or manually. The valve can be manually reset against
full-line pressure.
Governing Systems
The Woodward TG series constant speed oil relay governor is standard equipment for
RLHA steam turbines. Alternate governing systems are supplied when required for
some operating conditions or when specified by the client.
RLHA 24
Forged single dics wheel shrunk
and keyed to shaft
Rotors, Bearings, Sealing Glands
Removable
split carbon ring
gland housings
Axial split casting
Flinger type,
non-sparking
seals
Liner type split
sleeve bearings
Hard chrome
plated shaft
50,000 hour L-10 life
thrust bearing
Single-disc, two-row Curtis impulse-type wheels, shouldered, keyed
and shrunk to a large diameter 4140HT steel shaft, prevent
wheel movement relative to the shaft throughout the
turbine speed range. Turbine wheels are located
between the bearings; balancing and vibration
testing are in compliance with the dynamics secWoodward TG governor
tion of API 611.
®
Snap-acting bolt
type trip
Permanently
lubricated rod
end ball joints
Removable
stainless
steel steam
strainer
Oil ring
lubrication
Force actuated trip valve
Cooling
water
jackets
True center line support
Stainless
steel
nozzels
Cage
guided
throttle valve
Low
friction
carbon
sleeve
Radial bearings and housings are split at
the horizontal centerline for easy access
and replacement. Snap-in, liner-type
sleeve bearings are steel backed, tin
based babbitt for long life. Both oil ring and
pressure lubrication are available.
Anti-friction journal bearings also are available for quick-start applications or where
oil mist lubrication systems are specified.