1
Turbine Alignment Hardware
The L-705 and L-706 Bore Alignment Lasers are perfectly designed to
perform alignment of gas and steam turbine bores. The system uses a
laser, reference target, measuring target, micrometer sweep device, and
fixtures to hold the laser and targets. Since the laser beam is concentric
to the OD of the L-705/706 housing to within .0005 in. (0.013 mm), it
can serve as one reference target. This saves a lot of time during setup.
On most turbine alignments, the rotor bearing bores are used as the
references. This means that fixtures that hold the laser and reference
target must be placed precisely in these bores to the set points determined
by the manufacturer of the turbine.
The fixtures are hung in the bores using angle iron and special magnetic
bases. Depending upon the size of the bore, either the large (A-501) or
the small sweep unit (A-501A) is used to position the fixture so that the
center is exactly on the reference points provided. The sweep unit is
essentially an inside micrometer that allows the fixture to be placed to
any points desired (for example, .000 in. left, .009 in. right and -.010 in.
bottom).
Once both fixtures are swept in, the laser (L-705 for distances up to 50 ft.
(15 m) and the L-706 for distances from 50 to 110 ft. or 15 m to 33 m) is
placed in one reference fixture and a target (T-218T) is placed in the
opposite reference fixture. The L-705 laser is manufactured so that the
laser beam is concentric (centered to) to the housing's OD to within
.0005 in. (0.013 mm). With the fixture "swept in," the laser is inserted
into the fixture and is thus centered to the reference points.
All that is needed now is to adjust the angle of the laser beam, using the two micrometers on the back of
the L-705. These micrometers are adjusted until the reference target reads zero, both vertically and
horizontally. The laser is now set up and ready for measurements.
For measuring an individual component, such as a diaphragm, there are two target choices. The first is
the T-218T Turbine Target. The T-218T works much the same as the reference targets. The target fixture
(A-502A) is swept into the center of the bore using the A-501(A) sweep unit, then the target is placed in
the fixture and the reading is taken. A positive vertical reading means the diaphragm is higher than the
reference bores. A positive horizontal reading means the diaphragm is to the right of the reference bores.
Since the data is live, the diaphragm can be adjusted until the reading is zero (or to an offset determined
by the engineers).
The second measuring target that can be used is the A-1511 Wand Bore Target. Instead of using a fixture
to "hang" a target in the center of the bore, the A-1511 uses fixed-length legs that are approximately
equal to the radius of the bore. Two legs are used, each 90 degrees from the other. One leg has a
measuring tip on it and the other is used for support. The A-1511 has replaceable legs and can be used on
bores with a radius of 10 to 96 in. (254 mm to 2.44 m).
Recommended System
Configuration
L-705 Bore Laser
R-1307-2.4ZB Target Readout
T-218T 2-Axis Turbine Target
A-501A Turbine Small Bore
Sweep Unit
A-502A Turbine Reference
Target Bracket
A-502L Laser Support Bracket
T-231A 25 ft. (7.62 m) Target
Extension Cable
A-510 Self-Centering Small Bore
Target Adapter for 2 – 5 in.
Bores
A-814 Shipping Case
Optional Accessories
L-706 Long Distance Bore Laser
A-1511 Wand Bore Target
A-501A Turbine Bore Sweep
Unit
A-1519-2.4ZB Single-Axis
2.4GHz Wireless Scan Target
R-1308 Single-Axis Readout
A-1356-2.4ZB Ruggedized
Nomad PDA with Read15
Software
