URAI Blower Specification Sheet

S PECIFICATIONS
ROOTS Universal RAI ®
Rotary Positive Blowers
Frames 22 thru 718
BASIC BLOWER DESCRIPTION
Universal RAI blowers are heavy duty rotary blowers
designed with detachable rugged steel mounting feet,
which permit easy in-field adaptability to either vertical
or horizontal installation requirements.
Because of the detachable mounting feet, these
units can be easily adapted to any of four drive shaft
positions - right hand, left hand, bottom or top. 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 antifriction
bearings are used, with a cylindrical roller bearing at
the drive shaft to withstand V-belt pull. The Universal
RAI features thrust control, with splash oil lube on the
gear end and grease lube on the drive end. After stan
OUTLINE DRAWING & DIMENSIONAL TABLE
Drive Shaft
Approx.
Frame A B C
Location
O O’ P P’ R U Keyway Inlet & AX Net Wt.
Size D D1 D2 Disch. Dia (lbs.)
22 5.13 5.00 9.75 3.75 6.25 3.75 9.63 6.88 6.25 9.25 5.00 .625 .188 x .094 1.0 NPT 1.25 32
24 5.13 7.00 11.75 3.75 6.25 3.75 9.63 6.88 6.25 9.25 5.00 .625 .188 x .094 2.0 NPT 1.25 43
32 7.25 6.75 11.25 5.00 8.50 5.00 12.81 8.88 7.75 12.13 6.75 .750 .188 x .094 1.25 NPT 1.75 69
33 7.25 7.63 12.13 5.00 8.50 5.00 12.81 8.88 7.75 12.13 6.75 .750 .188 x .094 2.0 NPT 1.75 74
36 7.25 10.00 14.63 5.00 8.50 5.00 12.81 8.88 7.75 12.13 6.75 .750 .188 x .094 2.5 NPT 1.75 102
42 8.00 7.25 13.00 6.25 10.25 6.25 15.06 10.63 8.75 13.63 8.25 .875 .188 x .094 1.5 NPT 2.00 88
45 8.00 10.00 15.50 6.25 10.25 6.25 15.06 10.63 8.75 13.63 8.25 .875 .188 x .094 2.5 NPT 2.00 109
47 8.00 11.75 17.63 6.25 10.25 6.25 15.06 10.50 8.50 13.63 8.25 .875 .188 x .094 3.0 NPT 2.00 128
53 10.50 8.38 15.38 6.25 11.25 6.75 17.38 11.88 10.25 17.25 8.75 1.125 .250 x .125 2.5 NPT 2.50 143
56 10.50 11.00 18.00 6.25 11.25 6.75 17.38 12.25 11.00 17.25 8.75 1.125 .250 x .125 4.0 NPT 2.50 170
59 10.50 14.00 21.18 6.25 11.25 6.75 17.38 12.25 11.00 17.25 8.75 1.125 .250 x .125 4.0 NPT 2.50 204
65 11.00* 10.00 18.38 8.75 14.75 8.75 21.63 15.13 12.75 19.75 11.75 1.375 .312 x .156 3.0 NPT 3.00 245
68 11.00* 13.00 21.38 8.75 14.75 8.75 21.63 15.13 12.75 19.75 11.75 1.375 .312 x .156 5.0 NPT 3.00 285
615 11.00* 20.00 28.38 8.75 14.75 8.75 21.63 16.25 15.00 19.75 11.75 1.375 .312 x .156 6.0 FLG 3.00 425
76 14.00** 11.75 19.94 11.00 18.00 11.00 26.13 20.69 19.38 23.25 14.50 1.562 .375 x .188 4.0 NPT 3.50 400
711 14.00** 16.75 25.19 11.00 18.00 11.00 26.13 19.50 17.00 23.25 14.50 1.562 .375 x .188 6.0 FLG 3.50 530
718 14.00** 23.75 32.19 11.00 18.00 11.00 26.13 19.50 17.00 23.25 14.50 1.562 .375 x .188 8.0 FLG 3.50 650
S-12K84
February 2006
Horizontal, Gear End
Horizontal, Drive End Vertical, Gear End Vertical, Drive End
dard tests, the unit is sprayed with a protective paint and
boxed or placed on skids.
Available accessories include driver,
relief valve, inlet and discharge silencer,
inlet filter, check valve, extended base,
V-belt or flexible coupling and drive
guards.
DESIGN AND CONSTRUCTION
FEATURES
• Detachable steel mounting feet
• Rigid one-piece cast iron casing
• Anri-friction bearings
• Thrust Control
• Splash oil lubricated spur timing
gears
• Connections in standard pipe sizes
• Straight, precision machined
two-lobe impellers
• Ground steel shafts

PERFORMANCE TABLE
Frame
Size
22
24
32
33
36
42
45
47
53
56
59
65
68
615
76
711
718
Speed
RPM
1160
3600
5275
1160
3600
5275
1160
2800
3600
1160
2800
3600
1160
2800
3600
860
1760
3600
860
1760
3600
860
1760
3600
700
1760
2850
700
1760
2850
700
1760
2850
700
1760
2350
700
1760
2350
700
1760
2350
575
1400
2050
575
1400
2050
575
1400
2050
1 PSI 2 PS I 3 PS I 4 PS I 5 PS I 6 PS I 7 PS I 10
PS I 11
PS I 12
PS I 13
PS I 14
PS I 15
PS I MAX. VACUU M
CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP CFM BHP *Hg CFM BHP
10
49
76
24
102
156
40
113
149
55
156
205
95
262
344
38
92
204
79
188
410
105
249
542
72
211
355
123
358
598
187
529
881
140
400
546
224
643
876
420
1205
1641
195
526
788
362
970
1450
600
1590
2370
0.2
0.6
0.8
0.3
0.8
1.2
0.4
1.0
1.3
0.5
1.2
1.6
0.7
2.0
2.9
0.4
0.8
1.7
0.6
1.3
3.4
0.8
1.6
4.5
0.6
1.7
3.3
0.9
2.6
5.2
1.2
3.9
7.8
1.0
3.4
5.2
1.5
4.9
7.3
2.6
8.1
11.9
1.3
4.0
6.9
2.2
6.5
10.9
3.3
9.7
15.7
7
46
73
19
97
150
34
108
144
48
149
199
85
253
334
32
87
198
68
177
400
92
236
529
63
203
346
110
345
585
170
513
865
126
387
523
203
621
855
380
1164
1601
179
511
772
336
944
1424
563
1553
2333
0.3
0.8
1.2
0.4
1.3
1.9
0.6
1.6
2.0
0.8
2.0
2.5
1.2
3.3
4.5
0.6
1.3
2.6
1.1
2.2
5.3
1.4
2.8
7.0
1.0
2.7
5.0
1.6
4.6
8.0
2.2
6.4
11.8
1.8
5.3
7.7
2.7
7.9
11.4
4.8
13.9
19.3
2.3
6.4
10.5
4.0
11.0
17.5
6.3
17.0
26.9
4
43
70
15
93
146
30
104
140
43
144
193
78
245
327
28
82
194
60
169
392
82
225
519
56
196
340
100
335
575
158
500
852
116
377
522
187
605
838
351
1133
1570
168
500
761
316
925
1404
534
1524
2304
0.3
1.1
1.6
0.6
1.8
2.7
0.9
2.1
2.7
1.1
2.7
3.5
1.7
4.5
6.1
0.9
1.8
3.6
1.5
3.1
7.2
2.0
4.0
9.5
1.4
3.7
6.6
2.2
6.0
10.7
3.2
8.9
15.8
2.6
7.2
10.3
3.9
10.9
15.4
7.1
19.5
27.0
3.3
9.0
14.2
5.9
15.5
24.1
9.3
24.3
37.2
2
41
68
11
89
143
27
101
137
39
140
189
72
239
321
24
78
190
53
162
385
73
217
510
51
191
334
92
326
567
147
490
842
107
368
513
172
591
824
323
1107
1544
158
490
751
299
908
1387
510
1500
2280
0.4
1.3
1.9
0.8
2.3
3.4
1.1
2.7
3.4
1.4
3.5
4.5
2.3
5.8
7.7
1.1
2.2
4.5
2.0
4.1
9.1
2.6
5.3
12.0
1.8
4.7
8.2
2.9
7.7
13.5
4.2
11.4
19.9
3.3
9.1
12.8
5.1
14.0
19.5
9.3
25.2
34.6
4.3
11.5
17.8
7.7
20.0
30.7
12.3
31.6
47.9
39
66
8
86
140
24
98
134
35
136
185
66
234
315
21
75
186
48
156
379
66
209
503
46
186
329
85
319
560
138
480
832
100
360
506
160
579
812
301
1084
1521
150
481
742
284
893
1373
489
1479
2259
1.6
2.3
0.9
2.8
4.2
1.3
3.2
4.1
1.7
4.2
5.4
2.8
7.0
9.3
1.3
2.7
5.5
2.4
5.0
11.0
3.2
6.5
14.3
2.2
5.7
9.9
3.6
9.4
16.2
5.1
13.8
23.9
4.1
11.0
15.3
6.3
17.0
23.5
11.6
30.8
43.2
5.4
13.9
21.4
9.6
24.5
37.3
15.4
39.0
58.6
38
64
83
137
21
95
131
31
132
181
61
229
310
18
72
183
42
151
374
59
203
496
42
181
325
78
312
553
130
472
824
93
353
499
149
567
801
279
1063
1500
142
473
734
271
880
1359
470
1460
2240
1.8
2.7
3.3
4.9
1.6
3.8
4.8
2.1
5.0
6.4
3.3
8.3
10.9
1.5
3.1
6.4
2.9
5.9
12.9
3.8
7.7
17.0
2.6
6.7
11.5
4.3
11.1
19.0
6.1
16.3
27.9
4.8
12.8
17.8
7.5
20.0
27.6
13.8
36.5
49.8
6.4
16.4
25.0
11.4
29.0
43.9
18.4
46.3
69.4
36
63
81
135
19
93
129
28
129
178
57
224
306
15
69
181
37
146
369
53
196
490
38
177
321
72
306
547
464
816
86
347
492
139
557
790
260
1044
1481
134
466
727
258
867
1347
2.1
3.1
3.8
5.6
1.8
4.3
5.5
2.4
5.7
7.4
3.8
9.5
12.5
1.8
3.6
7.4
3.4
6.9
14.8
4.4
8.9
19.5
3.0
7.7
13.2
4.9
12.8
21.7
18.8
31.9
5.5
14.7
20.3
8.7
23.1
31.6
16.2
42.2
57.4
7.4
18.8
28.6
13.3
33.5
50.5
32
59
86
122
120
170
62
173
133
356
167
310
290
531
70
330
475
530
763
115
447
708
226
835
1315
2.8
4.2
6.0
7.7
8.0
10.3
5.0
10.2
9.6
20.5
10.8
18.1
17.9
30.0
7.8
20.4
27.4
32.2
43.8
10.4
26.3
39.5
18.8
47.1
70.3
31
57
84
120
118
167
60
171
163
307
285
526
325
470
522
755
441
703
3.1
4.5
6.5
8.4
8.7
11.2
5.5
11.2
11.8
19.7
19.6
32.7
22.3
30.4
35.2
47.8
28.7
43.1
29
56
82
118
116
165
58
169
160
304
280
521
320
466
515
748
436
697
3.3
4.9
7.1
9.1
9.5
12.2
81
117
7.6
9.8
79
115
8.2
10.5
77
113
8.7
11.2
5.9
1.1 2 167 13.1 165 14.1 163 15.0
12.8
21.3
276
517
24.2
32.9
38.2
51.9
31.2
46.7
157
301
23.0
38.2
316
461
507
740
421
684
14.2
23.0
26.1
35.5
41.3
55.9
33.7
50.4
15
98
5
15.2
4.6
9
2 2 2
311
457
500
733
415
679
27.9
38.0
44.3
60.0
36.1
54.0
5
307
452
421
682
26.2
29.8
40.5
38.6
57.6
4
14
15
6
14
15
10
15
16
10
14
15
10
12
15
8
14
15
8
12
15
8
12
15
10
14
16
10
14
16
8
12
15
12
16
16
10
15
16
8
12
14
12
16
16
12
15
16
10
12
12
6
28
53
12
69
119
18
78
110
27
113
159
55
213
278
19
56
160
46
134
332
63
181
452
36
158
391
70
276
501
135
445
770
71
300
445
135
495
715
292
997
1389
117
413
674
228
793
1256
446
1398
2178
0.3
2.0
3.1
0.6
3.8
5.8
1.3
4.5
5.9
1.7
5.6
7.6
2.7
7.9
12.7
1.1
3.5
8.0
1.9
5.8
15.9
2.5
7.5
19.8
2.2
7.5
14.0
3.5
12.3
23.2
4.1
15.6
32.1
4.7
15.8
21.6
6.2
23.5
34.0
9.1
35.0
54.9
6.2
20.4
30.6
11.2
34.4
54.6
15.0
44.7
6.4
Notes: 1. Performance based on inlet air at standard pressure of 14.7 psia, standard temperature of 68° F, and specific gravity of 1.0.
2. Vacuum ratings based on inlet air at standard temperature of 68°F, discharge pressure of 30” Hg and specific gravity of 1.0.
OPERATING PRINCIPLE
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 gas casing.
S-12K84
February 2006
Dresser Roots
Headquarters
16240 Port Northwest Drive
Houston, TX 77041
Toll Free (US): 1-877-363-7668
Ph: 832-590-2305
Toll Free (US) Fax: 1-877-357-7238
Fx: 832-590-2326
Dresser Roots
Connersville Operation
900 West Mount Street
Connersville, IN 47331
Ph: 765-827-9200
Fx: 765-827-9266
Dresser Roots
Holmes Operation
PO Box B7
Off St. Andrews Rd
Turnbridge, Huddersfield
England HD1 6RB
Ph: +44 (0) 1484 422 222
Fx: +44 (0) 1484 422 668
website: www.rootsblower.com • US email: roots@dresser.com • UK email: dmd_roots@dresser.co.uk
©2006 Dresser, Inc. all rights reserved. • Printed in the U.S.A. • All information subject to change without notice. ROOTS-FLO and Universal RAI are registered trademarks of Dresser,
Inc. • EasyAir, TRI-NADO, The Original ROOTS Blower, Universal RAI-J, Universal RAI-G, RAM, WHISPAIR, XLP Prime and XLP are trademarks of Dresser, Inc.