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.