GE Roots RAM blowers Brochure
SPECIFICATIONS
ROOTS™RAM™Rotary
Positive Blowers
Frames 404 thru 624
RAM™ stands for Reliability, Availability and
Maintainability. Today, more than ever, Roots is
committed to supplying our customers with reliable
products manufactured with state-of-the-art CNC
machine tools. Production and inventory are being
scheduled and controlled to ensure these units will be
available when you need them. Design improvements
such as repositionable rugged steel mounting feet and
die-cast aluminum drive end covers and gear covers
help to reduce installation costs and make normal
maintenance easier.
BASIC BLOWER DESCRIPTION
RAM™ rotary blowers are heavy-duty units designed
with integral-shaft ductile iron impellers having an
involute profile. The headplates and rigid, one-piece
casing are grey iron, while the drive end cover and gear
cover are aluminum. Carburized and ground alloy steel
spur timing gears are taper mounted on the shafts,
secured with a locknut. Cylindrical roller bearings are
used on all units.
Piston rings reduce air leakage through the shaft
openings in the headplates, and lip-type oil seals
prevent lubricant from entering the air chamber. A
hydrodynamic seal on the drive shaft prevents shaft
seal oil leaks.
RAM rotary blowers incorporate thrust control, with
splash oil lubrication at both ends of the blower.
All frame sizes are designed with detachable rugged
steel mounting feet which permit in-field adaptability to
either vertical or horizontal installation requirements.
The top shaft is extended for drive on side outlet
blowers, and either shaft can be extended for drive
on top or bottom outlet blowers.
DESIGN AND CONSTRUCTION FEATURES
1. Horizontal and vertical configurations available
2. Improved volumetric efficiency and reduced
operating temperatures
3. Alloy steel timing gears
4. Cylindrical roller bearings
5. Piston ring air seals
6. Lip-type, hydrodynamic oil seals,
7. Splash oil lubrication
OPERATING PRINCIPLE
WARRANTY PERIOD
Twenty-Four (24) months from date of original unit
start-up or 30 months from date of original shipment,
whichever occurs first.
S-28F98 rev.0608
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 air and carries it around the case to the blower outlet, where the air 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 air casing.
PERFORMANCE TABLE
O
R
C
B
U
D
L
EFT DISCHARGE RIGHT DISCHARGE
P
P
'
A
A'
D1
AX AX
O'
+.000
-.001
A
F - INLET
AF' - DISCHARGE
T
OP DISCHARGE
BOTTOM DISCHARGE
4 PSI
CFM BHP
148 3.6
280 6.8
396 10.4
225 5.4
426 10.0
601 15.1
338 8.0
638 14.7
900 21.9
450 10.6
849 19.4
1199 28.8
675 15.9
1275 28.9
1800 42.8
671 16.6
1128 25.6
2115 49.0
1006 25.1
1693 39.3
3173 77.6
Size
Speed
RPM
Frame
1750
2950
404
4000
1750
2950
406
4000
1750
2950
409
4000
1750
2950
412
4000
1750
2950
418
4000
1170
1750
616
3000
1170
1750
624
3000
otes: 1. Pressure ratings based on inlet air at standard pressure of 14.7 psia, standard temperature of 68° F, and specific gravity of 1.0.
N
2. Vacuum ratings based on inlet air at standard temperature of 68°F, discharge pressure of 30” Hg and specific gravity of 1.0.
6 PSI
CFM BHP
139 5.3
271 9.5
386 14.1
210 7.9
411 14.2
586 20.7
315 11.8
615 21
878 30.3
420 15.7
819 27.8
1169 39.9
630 23.5
1230 41.5
1755 59.5
614 24.6
1072 37.5
2058 68.8
921 37.1
1608 57.2
3088 107.3
8 PSI
CFM BHP
130 6.9
262 12.3
378 17.8
198 10.5
398 18.4
574 26.3
296 15.6
596 27.3
859 38.7
394 20.7
794 36.2
1144 51.1
592 31.1
1192 54.1
1717 76.3
566 32.6
1024 49.4
2010 88.6
849 49.1
1536 75.0
3016 137.1
10 PSI
CFM BHP
123 8.6
255 15.1
370 21.5
187 13
387 22.6
562 31.9
279 19.4
579 33.6
842 47
372 25.8
772 44.6
1121 62.2
559 38.7
1159 66.7
1684 93.0
524 40.6
982 61.3
1968 108.4
786 61.1
1473 92.8
2953 166.8
12 PSI
CFM BHP
116 10.3
248 17.9
364 25.2
177 15.5
377 26.8
552 37.5
264 23.2
564 39.9
827 55.4
352 30.8
752 52.9
1101 73.4
486 48.6
943 73.2
1930 128.2
15 PSI
CFM BHP
239 22
355 30.7
363 33.2
539 45.9
544 49.3
806 68
724 65.5
1074 90.1
1878 157.9
18 PSI
CFM BHP
347 36.2
526 54.3
788 80.5
MAX VACUUM
"HG CFM BHP
14.0 114 5.8
15.0 240 10.8
16.0 350 15.8
14.0 173 8.8
15.0 365 16.2
16.0 531 23.7
14.0 259 13.2
15.0 546 24.2
16.0 796 35.2
14.0 344 17.6
15.0 728 32.1
16.0 1060 46.6
14.0 517 26.4
15.0 1092 48.1
16.0 1591 69.8
13.0 501 25.7
14.0 929 41.7
16.0 1851 81.8
13.0 751 38.8
14.0 1394 63.0
16.0 2777 124.8
OUTLINE DRAWING &
DIMENSIONAL TABLE
VERTICAL CONFIGURATION
(Horizontal Air Flow)
Drive Shaft
FRAME A A’ BC OO’ P P’ RU Keyway Inlet Discharge AX NetWt
Location
SIZE D D1 Diameter Diameter (lbs)
404 8.00 11.00 8.75 18.50 11.25 7.50 16.63 13.50 12.00 15.25 9.00 1.500 .375 x.188 3.0 NPT 3.0 NPT 2.25 200
406 8.00 11.00 10.75 20.50 11.25 7.50 16.63 13.50 12.00 15.25 9.00 1.500 .375 x.188 4.0 NPT 4.0 NPT 2.25 230
409 8.00 11.00 13.75 23.50 11.25 7.50 16.63 13.00 11.00 15.25 9.00 1.500 .375 x.188 4.0 NPT 4.0 NPT 2.25 270
412 8.00 11.00 16.75 26.50 11.25 7.50 16.63 13.00 11.00 15.25 9.00 1.500 .375 x.188 6.0 FLG 6.0 FLG 2.25 330
418 8.00 11.00 22.75 32.50 11.25 7.50 16.63 13.00 11.00 15.25 9.00 1.500 .375 x.188 8.0 FLG 8.0 FLG 2.25 410
616 10.00 16.00 20.75 32.44 15.00 9.00 22.00 16.25 14.50 20.00 12.00 2.000 .500 x.250 8.0 FLG 8.0 FLG 3.00 650
624 10.00 16.00 28.75 40.44 15.00 9.00 22.00 16.25 14.50 20.00 12.00 2.000 .500 x.250 10.0 FLG 10.0 FLG 3.00 775
Notes: 1. All dimensions are in inches. 2. Do not use for construction.
Dresser Roots
Houston, Texas Headquarters • U.S. Toll Free Phone: 1-877-363-ROOT(S) (7668) • Direct Phone: +1 832-590-2600
Connersville, Indiana Operations • U.S. Toll Free Phone: 1-877-442-7910 • Direct Phone: +1 765-827-9285
United Kingdom Operations • Phone: +44 (0) 1695 52600
USA/Canada Sales • Phone: +1 773-444-3360
Houston, Texas Factory Service • Phone: +1 713-896-4810
Mexico City Sales and Factory Service • Phone: +52 55 5889 5811
Dubai Sales and Factory Service • Phone: +971 4-8830831
Malaysia Sales • Phone: +60 3 2163 0480
China Sales • Phone: +86 10 8486 2440
Shanghai Factory Service • Phone: +86 21 5858 7638
©2007 Dresser, Inc. all rights reserved. • Printed in the U.S.A. • All information subject to change
without notice. • Universal RAI and EasyAir are registered trademarks of Dresser, Inc. • ROOTS,
RAM X, and WHISPAIR, are trademarks of Dresser, Inc.
S-28F98 rev.0608
HORIZONTAL CONFIGURATION
(Vertical Air Flow)
AF AF’ Approx.
www.dresser.com/rootsblowers
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