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8/18/2019 Pivot Arm Turning Gear
1/24
GT 12 Turning (Barring ) Gear Table of contents
1 Basic overview Pages 2 to 4
2 Detailed description of operation Pages 5 and 6
3 P and ID Page 7
4 Manufacturers Manual Pages 8 to 15
5 Panel signals ( in German) Page 16 to 17
6 Solenoid Valve signal Trn/Gr Clutch-V1 12MBV35AA001 Page 18
7 Solenoid Valve signal Trn/Gr Clutch-V2 12MBV35AA002 Page 19
8 Solenoid Valve signal Trn/Gr S/O-V 12MBV35AA003 Page 20
9 Pivot Arm signal Engaged 12MKB21CG001H Page 21
10 Pivot Arm signal Disengaged 12MKB21CG001M Page 22
11 Pivot Arm signal Disengaged 12MKB21CG001N Page 23
12 Pivot Arm signal Disengaged 12MKB21CG001P Page 24
8/18/2019 Pivot Arm Turning Gear
2/24
Gas
Turbine
Description of
Components
Gas
Turbine
Hydraulic
Turning
Gear
'i
:..
j
'\.. -
Also
refer
to:
Lube and Jacking
Oil
System
3.1-8000
Function
The
hydraulic
turning
gear
is
used
to
turn
the rotor
after the
turbine-generator
has
been
shut
down.
This
ensures uniform
cooling
and
prevents
distortion
of the
rotor.
.
Construction
of
the
Shaft Turning Gear
A
gear
rim
(2)
is
mounted
on the intermediate
shaft
(3),
which
connects the turbine
rotor with
the
generator
rotor. This
gear
rim is located
near
the
compressor
bearing casing.
To
turn
the
shaft,
drive
pinion
(9)
mounted
on
a
swingarm is
shifted inward
to mesh with the
gear
rim
(2).
A
pinion
(5)
connects
the
drive
pinion
(9)
with the
hydraulic motor
(1).
'vVheii
errgagirrg
tire
drive
pirrion
(v),
rhe
circumferential speeds
of the
pinion
and the
gear
rim
(2)
on
the intermediate
shaft
(3)
must be equal.
The
speed
of the hydraulic
motor, allowing for the
gear
ratio,
must therefore
be
brought
to
the
meshing
speed (see Description, Section 3.1-8000).
Hydraulic
Motor
The
hydraulic
motor
(1)
converts
oil
pressure
into
torque,
which is
used to turn the rotor.
The
greater
the
oil
pressure
acting
on the hydraulic
motor, the
greater
this
torque
will be.
Motor speed is roughly
proportional
to
the
oil
flow
rate.
This
speed is
measured by
speed
sensors
(4).
Engaging
Mechanism
The
drive
pinion
(9)
is mounted
on a swing
arm
(8).
To
shift
the
drive
pinion
(9)
inward,
oil
pressure
is
applied
to the engaging
cylinder
(6).
I
he motion
ot
the engaging
cylinder
piston
causes
the
swingarm
and
the
attached
drive
pinion
(9)
to
move
toward
the
gear
rim
on
the
intermediate
shaft,
meshing
the
drive
pinion
(9)
with the shaft
gear
rim.
When
the
shaft turning
gear
is
not
in
operation.
the
engaging
cylinder
is not
pressurizeC
and
the
swingarm
is
held
in
the
disengaged
position
by
the
spring
(7).
:PP
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8/18/2019 Pivot Arm Turning Gear
3/24
Gas Turbine
Description of Components
Gas
Turbine
Hydraulic
Turning
Gear
,?
h ;9->
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1 Hydraulic
motor
2
Gear dm
3 lntermediate shaft
4 Speed
sensors
5
Pinion
6
Meshing
cylinder
7 Spring
8
Swing
arm
9 Drive
pinion
Fig.
1:
Hydraulic Turning Gear
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Power Generation
3.1-0340-9000/2
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Gas
Turbine
Description
of Auxiliary
Systems
Lubricant.
Supply
System
Lube
and
Jacking
OilSystem
i-
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Shaft Turning
Gear
After
the turbine-generator
has
been
shut
down, the
line
of shafting
(gas
turbine
and
generator)
is
rotated
at
low speed
(for
example,
120rpm)
in
turning
gear
mode.
This
flow
of alr forced
through
the
gas
turbine
by the
blading
ensures
uniform
cooldown
of
the
machine.
Distortion
of
the
casing
(arching:
caused
by
passive
cooling
without
sufficient
air
flow
through
the machine,
involves more rapid cooling of
the
lower casing
regions)
and rotor
are
prevented,
shaft
rotation
remains
unrestricted
and
the
turbine-generator
is
ready
for
the
next start.
The
gas
turbine
remains
in turning
gear
mode
until a
defined
time
has
elapsed
(K.TURN.O1
+
K.TURN.04,
for
example,
24
hours),
allowing
the
machine
to sufficienfly
cool
down.
This
operation
is referred
to
as
cooldown
turning. The
turning
gear
is shut
down
after
conclusion
of
cooldown
turning.
When
the
shaft has
come
to a standstill
(speed
lower
than
S.TURB.02
(for
example,
6rpm) for
longer
than
K.SCHMOEL.08
(for
example,
10min),
the
jacking
oil
pumo
and the
lube
oil
pump
are
shut down.
The
shaft
is
turned
briefly
at regular
intervals
of
K.TURN.02 (for
example,
every
6 hours)
during
extended
outages to
confirm
that
it
still rotates
freely.
Turning
gear
speed
is not
reached
at such
times.
This
operation
is
known as interval turning.
The
gas
turbine
is
started
either
from
a standstill
or
with the
shaft coasting
down.
lf
running,
the turning
gear
is shut down
prior
to
starting
the
gas
turbine.
Turning
gear
speed
is
selected
so
as
to
ensure
sufficient
air
throughput
for uniform
cooldown
of the
casing and to
prevent
blade clattering.
For
mechanical
design
reasons,
the turbine
blades
are
seated loosely
in
the
rotor
disk
slots
at
room
temperattrre. At
very low
shaft
speeds
the
blade
rcots
shift slightly in
their
slots and
clatter
audibly.
Above
a
certain speed,
centrifugal
force
firmly
seats
the
blade
roots.
The
shaft turning
gear
is located
in
the
compressor
after allowing
for the
gear ratio
of
the drive pinion
and
gear
ring.
Jacking
oil
is
supplied
to
the hydraulic
motor
and
the
swingarm
actuator.
During
operation
of the
gas
turbine
with the
jacking
oil
pump
shut down,
the hydraulic
motor
is
supplied
with
lube
oil
via
swing
check
valve
MBV35AA201
to
prevent
damage
that
is
typical
of
extended
equipment
standstills.
When
solenoid
valves
MBV35AA001
and
MBV35AA002
of
the swingarm
actuator
are
energized,
hydraulic
oil
is
supplied to
hydraulic
cylinder
MBK21AU001
and the
swingarm
pivots
inward,
meshing
the
pinion
at its
free
end
with
the
gear
ring.
lf
the
solenoid
valves
of the
swingarm
actuator
are deenergized
or.if
the
jacking
oil
pressure
declines,
the
swingarm
is returned
to
its
disengaged
position
by
spring
force.
The
hydraulic
motor
is supplied
with
hydraulic
oil
via
solenoid-type
shutoff
valve
MBV35AA003
and
flow
control
valve
MBV35AA101.
The
speed
of the
hydraulic
motor
can be
varied
from
near standstill
to
just
above
the
nominal
turning
gpar
speed
by
adjusting
the lift
of the
flow
control
valve.'This
is
achieved
by
energizing
solenoid
valve
MBV35AA101-Y01
(high
oit flow
rate
and
high
speed)
or
MBV35M101-Y02
(low
oil
flow rate
and
low
speed).
The
turning
gear can be
engaged while
the
turbine-
generator
shaft
is
at rest
or
coasting
down.
When
the
turbine-generator
shaft
is at rest,
the
swingarm
is
pivoted
inward
to
engage
the
pinion
gear
mounted
on its
free
end
with
the
gear
ring
on
the turbine-generator
shaft;
this
is
performed
with
the hydraulic
motor
shut
down
(solenoid-
type
shutoff
valve
MBV35AA003
is
closed).
The
solenoid-
type
shutoff
valve
is then
opened
and
the actuator
of
the
flow
control
valve
is
operated
using
a time
function
to
achieve
the lift
required for the turning gear
speed.
This
begins
turning
gear
mode.
When
shutting
down
the
gas
turbine,
turning gear
mode
begins
while
the turbine
generator
shaft
is
coasting
down.
The
disengaged
hydraulic
motor
is
accelerated
to
engaging
speed
(e.9.,
10
to
20rpm)
by
opening
the
8/18/2019 Pivot Arm Turning Gear
6/24
Gas Turbine
Description
of Auxiliary
Systems
Lubricant
Supply
System
Lube
and
Jacking
Oil
System
i
pivot outward
to
its disengaged position and
the
hydraulic
motor
coasts
to
a
stop.
The
flow control
valve
is
then
actuated to its
minimum
lift
setting.
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8/18/2019 Pivot Arm Turning Gear
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t\
BHS
CINCINNATI
List
of
contents
1
Assembly
Instruction
2
Commissioning
r i
3
Operating
Instruction
4
Assembly Drawing
Installation Drawing
5
Spare
part
list
6
Wiring
diagram
7
Operating Instruction
hydraulic
motor
8/18/2019 Pivot Arm Turning Gear
9/24
.i
BHS
Assembly
lnstructions
for
Rotor
Turning
Genr
Cincinnati
Adjustment
of
the
Rotor
Turning
Gear
Based on the
known
theoretical
distance from
the rotor
centre
to
the turning gear
flange
surface, the operating
position
of
swivel
pinion
(5)
is
exactly
adjusted
by BHS-Cincinnati.
Also, the
contactless
limit
switches
for
the
positions
engaged
and
disengaged
are
adjusted.
This
adjustment
must
not
be modified by
the
customer.
For
obtaining
the
correct
distance 473.2
between
rotor
centre
and
turning
gear
flange
surface,
BHS-C
will
provide
a
shirn
with
overmeasure
which
will
have
to
be
reworked
according to
the
actual
dimensions.
Adjustment
of Tooth
Flank
Clearance
Fut rotor
turning
gear
on bearing
covet.
For
orientation,
the
turning
gear
centre
has
been
marked
at the flange
base.
Engage
swivel pinion by hydraulic cylinder in
gear
ring
(hydraulic
hand
pump).
By
means
of
a feeler
gauge,
measure
the
tooth
flank
clearance
between
swivel
pinion
and
gear
ring.
Flank
clearance
target
0.3
*
0.1
rnrn
The
flank
clearance
can
be
modified by
clisplacement
of
the
turning
gear transversely
to
the
turbine axis.
Displacernent
to
the
left
seen
in direction
of
flow
-
higher
flank clearance
Displacement to the right
seen
in direction
of
flow -
lower
flank
clearance
Adjustment of Tooth
Contact
The tooth
contact
pattern
must
be checked
by
applying
ink.
Where
appropriate,
twist
the
turning
gear
by
its
vertical
axis
until
the tooth
contact
pattern
is equal
to
or better
than
80%
l.l
1.2
{i
1.3
8/18/2019 Pivot Arm Turning Gear
10/24
rtr
BHS
Opernting
fnstructions
Rotor
Turning
Gear
incinnati
Commissioning
2 1
Wire
the connection
between control
cabinet and
turning
gear
according
to
tenninal plan
2 2
Check the
wiring
Check
the signats
of
limit
switches and
speed
probes
2 3
Connect
hydraulic
motor
to
hydraulic
system
Check
sense
of rotation
as
per
installation drawing
2 4
Connect
hyclraulic
cylinder
to
hyclraulic
system
Check
proper
lunctioning
Check all
connections for
leakage
8/18/2019 Pivot Arm Turning Gear
11/24
:
BHS
Operatirrg Instnr
ctions
Rotor
Turning
Gear
incinnati
3.1
Automatic
Starting
from
Standstill
Engage
swivel
pinion
(5)
through hydraulic cylinder
(2S)
in
gear
ring
(9).
If
swivel
pinion (5)
does not mesh
with
gear
ring
(9),
then
drive
turning
gear
through
hydraulic
motor with
low
speed.
Cornplete
mesh
is
inclicated
by
lirnit
swiictr
(25).
Drive turning
gear
with full
power
and accelerate
rotor to turning
speed.
3,2
Automatic
Turning
after
Tripping
the
Turbine
Turbine has been
tripped
and
is
slowing down.
When the
rotor
has
reached
the
comntand speed
(approx.
double
turning
speed),
the
hydraulic
motor
is
started
by
means
of
the
control unit,
with
swivel pinion rernaining in
position
"blocked".
On
reaching the
turning
speed
(fi-equency
comparison
between gear
ring
and
swivel
pinion)
the hydraulic cylinder
is
actuated.
The
swivel
pinion
gets
in
mesh
with the
gear
ring.
The rotor
turning
gear
drives
the rotor at turning
speed
3.3
Disconnecting
the
Rotor Turning
Gear
Reverse
the
oil
supply
to
the
hydraulic
cylincler.
Swivel
pinion
is
put
out of
mesh
by spring
force.
Limit
swif
ches
Q2-23
-24) i
ndicate
position
"
di
sengaged
".
Switch
off
hydraulic motor.
When
accelerating
the turbine
from turning
speed
it
must
be
ensured
that
turning
gear
is
disconnected
and
swivel
pinion
is
disengaged
as
soon
as
turbine is
started.
(Lintit
switches
22-23 -24
indicate
position
"disengaged".
rt
8/18/2019 Pivot Arm Turning Gear
12/24
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DRWG.NO.
5L.62g32.1-
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8/18/2019 Pivot Arm Turning Gear
15/24
*BHS*
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SPARE
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=========================
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ROTOR-TURNING-GEAR
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DRWG.NO.
51,.62932
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