CAMCORP HVP with Roots Blower - Manual (Page 52)

5 For your nearest ROOTS office contact information, please consult the last page of this document.
installation can be obtained by setting the baseplate on a con-
crete slab that is rigid and free of vibration, and leveling the
top of the base carefully in two directions so that it is free of
twist. The slab must be provided with suitable anchor bolts.
The use of grouting under and partly inside the leveled and
shimmed base is recommended.
It is possible for a base-mounted assembly to become twist-
ed during shipment, thus disturbing the original alignment.
For this reason, make the following checks after the base has
been leveled and bolted down. Disconnect the drive and
rotate the unit shaft by hand. It should turn freely at all
points. Loosen the unit foot hold-down screws and deter-
mine whether all feet are evenly in contact with the base. If
not, insert shims as required and again check for free
impeller rotation. Finally, if unit is direct coupled to the driv-
er, check shaft and coupling alignment carefully and make
any necessary corrections.
In planning the installation, and before setting the unit, con-
sider how piping arrangements are dictated by the unit
design and assembly. Drive shaft rotation must be estab-
lished accordingly and is indicated by an arrow near the
shaft.
Typical arrangement on vertical units has the drive shaft at
the top with counterclockwise rotation and discharge to the
left. Horizontal units are typically arranged with the drive
shaft at the left with counterclockwise rotation and discharge
down. See Figure 4 for other various unit arrangements and
possible conversions.
When a unit is DIRECT COUPLED to its driver, the driver RPM
must be selected or governed so as not to exceed the maxi-
mum speed rating of the unit. Refer to Table 1 for allowable
speeds of various unit sizes.
A flexible type coupling should always be used to connect the
driver and unit shafts.
When direct coupling a motor or engine to a blower you must
insure there is sufficient gap between the coupling halves and
the element to prevent thrust loading the blower bearings.
When a motor, engine or blower is operated the shafts may
expand axially. If the coupling is installed in such a manner
that there is not enough room for expansion the blower shaft
can be forced back into the blower and cause the impeller to
contact the gear end headplate resulting in damage to the
blower. The two shafts must be in as near perfect alignment
in all directions as possible, and the gap must be established
with the motor armature on its electrical center if end-play
exists. Coupling manufacturer’s recommendations for maxi-
mum misalignment, although acceptable for the coupling, are
normally too large to achieve smooth operation and maxi-
mum life of the blower.
The following requirements of a good installation are recom-
mended. When selecting a coupling to be fitted to the blower
shaft ROOTS recommends a taper lock style coupling to
insure proper contact with the blower shaft. If the coupling
must have a straight bore the coupling halves must be fitted
to the two shafts with a line to line thru .001” interference fit.
Coupling halves must be warmed up per coupling manufac-
turer’s recommendations. Maximum deviation in offset align-
ment of the shafts should not exceed .005” (.13 mm) total
indicator reading, taken on the two coupling hubs. Maximum
deviation from parallel of the inside coupling faces should not
exceed .001” (.03 mm) when checked at six points around
the coupling.
When a unit is BELT DRIVEN, the proper selection of sheave
diameters will result in the required unit speed. When select-
ing a sheave to be fitted to the blower shaft ROOTS recom-
mends a taper lock style sheave to insure proper contact with
the blower shaft. This flexibility can lead to operating tem-
perature problems caused by unit speed being too low. Make
sure the drive speed selected is within the allowable range for
the specific unit size, as specified under Table 1.
Belt drive arrangements usually employ two or more V-belts
running in grooved sheaves. Installation of the driver is less
critical than for direct coupling, but its shaft must be level
and parallel with the unit shaft. The driver should be mount-
ed on the inlet side of a vertical unit (horizontal piping) and
on the side nearest to the shaft on a horizontal unit. SEE
PAGE 6 - Acceptable Blower Drive Arrangement Options.
The driver must also be mounted on an adjustable base to
permit installing, adjusting and removing the V-belts. To
position the driver correctly, both sheaves need to be mount-
ed on their shafts and the nominal shaft center distance
known for the belt lengths to be used.
CAUTION: Drive couplings and sheaves (pulleys) should have
an interference fit to the shaft of the blower (set screw types
of attachment generally do not provide reliable service.) It is
recommended that the drive coupling or sheave used have a
taper lock style bushing which is properly sized to provide the
correct interference fit required. Drive couplings, that require
heating to fit on the blower shaft, should be installed per cou-
pling manufacturer recommendations. A drive coupling or
sheave should not be forced on to the shaft of the blower as
this could affect internal clearances resulting in damage to
the blower.
Engine drive applications often require special consideration
to drive coupling selection to avoid harmful torsional vibra-
tions. These vibrations may lead to blower damage if not
dampened adequately. It is often necessary to install a fly-
wheel and/or a torsionally soft elastic element coupling
based on the engine manufacturer recommendations.
The driver sheave should also be mounted as close to its
bearing as possible, and again should fit the shaft correctly.
Position the driver on its adjustable base so that 2/3 of the
total movement is available in the direction away from the
unit, and mount the assembly so that the face of the sheave
is accurately in line with the unit sheave. This position mini-
mizes belt wear, and allows sufficient adjustment for both
installing and tightening the belts. After belts are installed,
adjust their tension in accordance with the manufacturer’s
instructions. However, only enough tension should be
applied to prevent slippage when the unit is operating under
load. Excessive tightening can lead to early bearing concerns
or shaft breakage.
Before operating the drive under power to check initial belt
tension, first remove covers from the unit connections. Make
sure the interior is still clean, then rotate the shaft by hand.
Place a coarse screen over the inlet connection to prevent
anything being drawn into the unit while it is operating, and
avoid standing in line with the discharge opening. Put oil in
the sumps per instructions under LUBRICATION.
Piping
Before connecting piping, remove any remaining anti-rust
compound from unit connections. Clean pipe should be no