Brochure

SPECIFICATIONS
ROOTS
™
UNIVERSAL RAI-G
®
Rotary Positive Gas Blowers
Frames 32 thru 615
Two figure-eight lobe impellers mounted on parallel shafts rotate in
opposite directions. As each impeller passes the blower inlet, it traps
a definite volume of gas and carries it around the case to the blower
outlet, where the gas is discharged. With constant speed operation, the
displaced volume is essentially the same regardless
of pressure, temperature or barometric pressure.
Timing gears control the relative position of the
impellers to each other and maintain small but
definite clearances. This allows operation without
lubrication being required inside the gas casing.
O
R
B
U
A
A
D1
D
BOTTOM
SHAFT
TOP
SHAFT
P

M
C
+ 000
- 001

P
D2
O'
AX AX
INLET & DISCHARGE CONNECTIONS
RIGHT DISCHARGE

BOTTOM DISCHARGE

TOP DISCHARGE

LEFT DISCHARGE

OUTLINE DRAWING & DIMENSIONAL TABLE
OPERATING PRINCIPLE
VERTICLE CONFIGURATION
DESIGN AND CONSTRUCTION FEATURES
1. Mechanical seals
2. Rigid one-piece cast iron casing
3. Anti-friction bearings
4. Splash oil lubricated spur timing gears
5. Connections in standard pipe sizes
6. Straight, precision machined two-lobe impellers
7. Ground steel shafts
8. Detachable steel mounting feet
HORIZONTAL CONFIGURATION
32 7.25 7.25 6.75 11.25 5.00 8.50 5.00 5.81 12.81 8.88 7.75 12.13 6.75 .750 1.25 NPT 1.75 69
33 7.25 7.25 7.63 12.13 5.00 8.50 5.00 6.25 12.81 8.88 7.75 12.13 6.75 .750 2.0 NPT 1.75 74
36 7.25 7.25 10.00 14.63 5.00 8.50 5.00 7.56 12.81 8.88 7.75 12.13 6.75 .750 2.5 NPT 1.75 102
42 8.00 8.00 7.25 13.00 6.25 10.25 6.25 6.86 15.06 10.63 8.75 13.63 8.25 .875 1.5 NPT 2.00 88
45 8.00 8.00 10.00 15.50 6.25 10.25 6.25 8.00 15.06 10.63 8.75 13.63 8.25 .875 2.5 NPT 2.00 109
47 8.00 8.00 11.75 17.63 6.25 10.25 6.25 9.25 15.06 10.50 8.50 13.63 8.25 .875 3.0 NPT 2.00 128
53 10.50 10.50 8.38 15.38 6.25 11.25 6.75 8.18 17.38 11.88 10.25 17.25 8.75 1.125 .2.5 NPT 2.50 143
56 10.50 10.50 11.00 18.00 6.25 11.25 6.75 9.19 17.38 12.25 11.00 17.25 8.75 1.125 4.0 NPT 2.50 170
59 10.50 10.50 14.00 21.18 6.25 11.25 6.75 11.19 17.38 12.25 11.00 17.25 8.75 1.125 4.0 NPT 2.50 204
65 11.00 11.00 10.00 18.38 8.75 14.75 8.75 9.19 21.63 15.13 12.75 19.75 11.75 1.375 3.0 NPT 3.00 245
68 11.00 11.00 13.00 21.38 8.75 14.75 8.75 10.82 21.63 15.13 12.75 19.75 11.75 1.375 5.0 NPT 3.00 285
615 11.00 11.00 20.00 28.38 8.75 14.75 8.75 14.32 21.63 16.25 15.00 19.75 11.75 1.375 .6.0 FLG 3.00 425
INLET
Frame A A’ B C D D1 D2 M O O’ P P’ R U DISCH. AX WGT
S-60A01 rev.0608
BASIC BLOWER DESCRIPTION
Universal RAI-G
®
gas blowers are heavy duty rotary blowers
designed with mechanical seals and rugged steel mounting
feet. Optional feet are available for horizontal installations.
The compact, sturdy design is engineered for continuous
service when operated in accordance with speed and
pressure ratings.
The basic model consists of a cast iron casing, carburized
and ground alloy steel spur timing gears secured to steel
shafts with a taper mounting and locknut, and cast iron
involute impellers. Oversized anti-friction bearings are used,
with a cylindrical roller bearing at the drive shaft to with-
stand V-belt pull. The Universal RAI-G
®
features splash oil
lube on the gear end and grease lube on the drive end.
ROOT’s exclusive “figure-eight” gearbox design improves
oil distribution to maximize gear and bearing life.
Each unity is mechanically tested and given a 15 psig
static leak test. A 1/8” NPT purge port is provided at each
seal for buffer gas application as required. After testing, the
unit is sprayed with a protective paint, and boxed or skid
mounted for delivery.
Accessories are available through our distributors.
ROOTS
TM
Synthetic Oil and grease is recommended to
maintain warranty.