CAMCORP Blower Package with Roots Blower - Manual (Page 36)

13 ©2002 Dresser, Inc. all rights reserved.
ROOTS, RAM, URAI and WHISPAIR are trademarks of Dresser, Inc.
Dresser Design and Universal RAI are registered trademarks of Dresser, Inc.
15. For setting end clearances on 2-1/2” thru 5” gear
diameter units, special tools, thrust adjuster fork
and thrust adjuster saddle are required. Refer to
Table 5 for installation of tools. The flat side of the
saddle rests against the bearing inner race and the
flat side of the fork rests against the back side of
the gear. Install a shim, with thickness equal to
gear end clearance (Table 5), between the impeller
and the gear end headplates. Tap on top of the fork
until the shim becomes snug. Remove the shim
and check end clearances. To increase gear end
clearance, tap on the end of the gear end shaft
with a soft metal mallet. Set end clearances for
6” & 7” by turning capscrews (31) evenly in or out.
16. Install drive end cover (5) after packing bearing
cavities with suitable grease. Replace drive shaft
seal. Lip must point toward (33) the bearing.
Exercise care not to damage the lip as it passes
over shaft keyway.
17. Install gasket item (7). Install the gear house after
cleaning out the inside. Tighten gear box cap
screws (23) evenly. Fill with correct grade of oil
until oil flows out through oil level hole. Grease
drive and bearings. (See Lubrication.)
18. Reinstall coupling or belt sheave making sure that
they have a slight slide fit with the shaft and could
be installed by hand.
discharge gas pressure. Also, there exists a
possibility of gear end oil and drive end grease
leakage into the gas stream.
The lubricants selected must be compatible with the
gas. Mechanical Seal Replacement: Disassemble the
blower. During disassembly, damage to mechanical
seals is very likely. During rebuild, always use new
mechanical seals. Prior to any assembly, make sure
that all parts are completely clean and free from nicks
and scratches.
(1) Place head plate on an assembly table with seal
bores pointing up. Coat the OD of the stationary
seal element and install it with carbon facing up in
the seal bore with a seal driver that is guided by the
bearing bore. Drive the seal flush with front face of
the seal bore. Repeat this procedure for all four
seals. Apply a light coating of lubricating oil on the
sealing surface. Protect sealing faces during
assembly from any damage.
(2) Apply teflon based sealant on the cylinder flanges
before installing head plates. Continue the assembly
procedure as outlined up to bearing installation.
Before installation of the bearings, the seal mating
rings need to be installed. Apply light film of
lubricating oil on mating ring o-rings and sealing
faces. Slide mating rings on the shaft and up to
carbon faces making sure that no damage to the
o-rings occur during installation (break sharp
shaft corners to avoid damage to the o-rings during
initial preparation). Install bearings all the way
against the back bearing bore shoulders.
(3) Complete the rest of the assembly.Make sure all
plugged holes are sealed with teflon thread
liquid sealant.
Note: On 6” gear diameter units, shims (44) are used
between the bearing clamp plates and the head plate
on the gear end.
Also, on size 32 and 42, washers with embedded
o-rings are used on the center head plate to
cylinder bolts.
After the assembly is completed, plug the blower
inlet and discharge connections and run static
soap bubble. Leak test to assure leak
free assembly.
For satisfactory operation of mechanical seals,
synthetic lubricants are recommended (Check
suitability to gases before using.)
Oils:
(1) ROOTS
™ GT Synthetic Lubricant ROOTS
P/N 13-106-001 (1) one quart ISO-220
(2) Mobil SHC 600 Series Lubricating Oils
Grease:
ROOTS ™ Synthetic Grease – NLGI # 2
ROOTS P/N T20-019-001 (1) one 14 oz tube
T
ECHNICAL
S
UPPLEMENT
for 32, 33, 36, 42, 45, 47, 53, 56, 59, 65, 68, 615
U NIVERAL RAI ® -G BLOWERS
ROOTS ™ Universal RAI ™ -G rotary positive gas blowers
are a design extension of the basic Universal RAI ™
blower model. URAI ™ -G blower uses (4) mechanical
seals in place of the standard in board lip seals to
minimize gas leakage into the atmosphere. The seal
vent chambers are plugged. These units are intended
for gases which are compatible with cast iron case
material, steel shafts, 300/400 series stainless steel
and carbon seal components, viton o-rings and the
oil/grease lubricants. If there are any questions
regarding application or operation of this gas blower,
please contact factory.
Precaution: URAI ™ -G blowers: Care must be used
when opening the head plate seal vent chamber
plugs ( 43) as some gas will escape–if it is a pres-
sure system, or the atmospheric air will leak in-if
the system is under vacuum. There is a possibility
of some gas leakage through the mechanical seals.
This leakage on the gear end will escape through
the gear box vent, and on the drive end, through
the grease release fittings. If the gas leakage is
undesirable, each seal chamber must be purged
with an inert gas through one purge gas hole
(43 ) per seal . There are two plugged purge gas
holes(1/8 NPT) provided per seal. The purge gas
pressure must be maintained one psi above the