Specification Sheet

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GE Oil & Gas

Roots

Rotary Lobe Positive

Displacement Blowers

Universal RAI

Series | RAM

Series | RCS

Series | DVJ and DPJ Series

Bi-Lobe Principle

URAI, URAI-DSL, URAI-G, RAM, RCS Series

Two figure-eight lobe impellers mounted on parallel

shafts rotate in opposite directions. As each impeller

passes the blower inlet, it traps a finite 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 finite clearances.

This allows operation without lubrication being required

inside the lobe cavity.

Operating Principles

WHISPAIR

Principle

URAI-J, URAI-J DSL, RAM-J, RAM-GJ, RAM-VJ, RCS-J

Incoming air is trapped by the impellers. Simultaneously,

pressurized air (right) is being discharged. As the impeller

passes the wrap-around flange, the Whispair jet

equalizes pressure between trapped air and discharge

area, aiding impeller movement and reducing power.

Impellers move air into the discharge area. Backflow is

controlled, resulting in reduction of noise and pulsation

relative to conventional blowers.

DVJ/DPJ Principle

2504 DVJ, RAM DVJ, 721 DVJ, 406 DPJ

Incoming air is trapped between the impellers.

Simultaneously, pressurized air is being discharged.

As the impeller passes the jet plenum, cooled, pressurized

air flows into the space between the impeller and cylinder.

This cools the trapped air, helps control thermal growth

and allows higher pressure ratios. The trapped air is then

moved into the discharge flange. Backflow is reduced,

resulting in lower operating noise level and reduced

shock loading on the equipment.

Warranty

Proven designs, manufacturing and material provide

assurance for superior operation. Local, factory trained,

service centers offer timely response to your unique

needs. Roots products are sold subject to GE’s general

terms of sale and warranty policy; contact your nearest

GE office for more information.

Summary of content (16 pages)

PAGE 1
GE Oil & Gas Roots* Rotary Lobe Positive Displacement Blowers Universal RAI* Series | RAM* Series | RCS* Series | DVJ and DPJ Series Operating Principles Bi-Lobe Principle URAI, URAI-DSL, URAI-G, RAM, RCS Series Two figure-eight lobe impellers mounted on parallel shafts rotate in opposite directions. As each impeller passes the blower inlet, it traps a finite volume of air and carries it around the case to the blower outlet, where the air is discharged.
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Universal RAI Series Rotary Positive Displacement Blowers All Universal RAI (URAI) series blowers are heavy duty rotary blowers in a compact, sturdy design engineered for continuous duty and maximum reliability. These blowers have a time tested lubrication system. GE’s exclusive “figure-8” gearbox design improves oil distribution to the timing gears and lengthens bearing life.
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Universal RAI Blower Performance Table Frame Size 22 24 323,5 333,4,5 363,4,5 423,5 453,4,5 473,4,5 533,5 563,4,5 593,5 653,5 3,5 68 6153,5 76 711 718 Notes: 1 psi 6 psi 7 psi 10 psi 12 psi 13 psi 14 psi 15 psi Max Vacuum Speed RPM CFM BHP 1160 10 0.1 3600 49 0.3 38 1.6 36 1.8 32 2.6 29 5275 76 0.5 64 2.4 63 2.7 59 3.8 56 1160 24 0.2 3600 102 0.6 83 3.1 81 3.6 5275 156 0.9 137 4.6 135 5.4 1160 40 0.2 21 1.4 19 1.6 2800 113 0.
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Universal RAI-G Blower Performance Table Frame Speed Size RPM 32 33 36 42 45 47 1 psi 3 psi 5 psi 7 psi CFM 11 psi BHP CFM 13 psi CFM BHP CFM BHP 1200 37 0.2 25 0.7 16 1.2 1800 64 0.4 52 1.1 43 1.8 36 2.5 2500 96 0.6 83 1.5 75 2.5 68 3.5 56 5.5 51 6.4 49 6.9 3600 145 0.9 133 2.3 124 3.7 117 5.2 106 8 101 9.4 99 10.1 1200 52 0.3 36 1 24 1.6 89 0.5 73 1.5 61 2.5 52 3.4 2500 132 0.8 116 2.1 105 3.5 96 4.8 81 3600 200 1.
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Universal RAI Dimensions 1 Frame Size A B C 22 24 32 33 36 42 45 47 53 56 59 65 68 615 76 711 718 5.13 5.13 7.25 7.25 7.25 8.00 8.00 8.00 10.50 10.50 10.50 11.001 11.001 11.001 14.002 14.002 14.002 5.00 7.00 6.75 7.63 10.00 7.25 10.00 11.75 8.38 11.00 14.00 10.00 13.00 20.00 11.75 16.75 23.75 9.75 11.75 11.25 12.13 14.63 13.00 15.50 17.63 15.38 18.00 21.18 18.38 21.38 28.38 19.94 25.19 32.19 17.00 in horizontal configuration Drive Shaft Locations D D1 D2 3.75 3.75 5.00 5.00 5.00 6.25 6.25 6.25 6.
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RAM Series Rotary Positive Displacement Blowers Roots RAM series units are recognized by many as the most volumetrically efficient blowers in the industry. Unless otherwise noted, RAM series equipment may operate under either vacuum or pressure application with no equipment modification, and can provide simultaneous vacuum and pressure for a system with a single unit. RAM series units feature integral-shaft ductile iron impellers with involute profiles.
PAGE 7
RAM, RAM-J and RAM-GJ Blower Performance Table Frame Size 404 406 409 412 418 616 624 4 psi 6 psi 8 psi Speed RPM CFM BHP CFM BHP CFM 1750 148 3.6 139 5.3 2950 280 6.9 271 9.6 4000 396 11.1 386 1750 225 5.5 210 2950 426 10.2 4000 601 16.1 1750 338 2950 4000 10 psi BHP CFM 130 6.9 262 12.4 14.4 378 7.9 198 411 14.3 586 21.1 8.2 315 638 15 900 23.
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AF - INLET AF’ - DISCHARGE P’ P C AX AX RIGHT DISCHARGE TOP DISCHARGE +.000 -.001 O O’ U D R D1 B BOTTOM DISCHARGE A A’ VERTICAL CONFIGURATION (Horizontal Air Flow) HORIZONTAL CONFIGURATION (Vertical Air Flow) RAM Blowers Dimensions Drive Shaft Location O O’ P P’ R U Keyway AF Inlet Dia. AF’ Dsch. Dia. AX Approx. Net Wt (lbs) 7.50 16.63 13.50 12.00 15.25 9.00 1.50 .375 x.188 3.0 NPT 3.0 NPT 2.25 200 11.25 7.50 16.63 13.50 12.00 15.25 9.00 1.50 .375 x.
PAGE 9
RCS Series Rotary Positive Displacement Blowers Roots RCS series units are heavy-duty units with integral-shaft ductile iron impellers in an involute profile. The headplates, gear cover, drive end cover and rigid, one-piece casing are grey iron. Carburized and ground alloy steel spur timing gears are taper mounted on the shafts and secured with a locknut. Cylindrical roller bearings combined with high volume oil reserves offer low maintenance and trouble free operation.
PAGE 10
RCS Series Blower Performance Table 4 psi 6 psi 8 psi 10 psi 12 psi Frame Size Speed RPM 880 982 24.8 894 36.7 820 48.6 755 60.5 817 1770 2368 55.7 2281 79.2 2207 102.7 2142 2250 3116 76.6 3028 106.0 2955 135.3 880 1326 33.5 1207 49.6 1108 65.6 1770 3198 75.0 3080 106.7 2980 2250 4208 103.1 4090 142.7 3990 880 1519 38.3 1383 56.7 1770 3665 85.0 3529 2250 4822 116.
PAGE 11
AF – INLET AF’ - DISCHARGE P’ P C AX INLET AX INLET DISCH. +.000 -.001 O O’ U D R B DISCH. D1 A A’ HORIZONTAL CONFIGURATION (Vertical Air Flow) VERTICAL CONFIGURATION (Horizontal Air Flow) RCS Blowers Dimensions Frame Size A 817 19.00 27.00 24.25 824 19.00 27.00 30.50 827 19.00 27.00 34.00 A’ B Drive Shaft Location C O O’ P P’ R U Keyway AF Inlet Dia. AF’ Dsch. Dia. AX Approx. Net Wt (lbs) D D1 38.44 18.00 10.00 28.38 20.38 19.00 25.25 14.00 2.75 .
PAGE 12
DVJ and DPJ Rotary Positive Displacement Blowers These units feature an integral discharge jet plenum design, allowing cool, atmospheric air to flow into the casing. This unique design permits continuous operation at high vacuum levels (up to blank-off) with a single stage unit. In the case of Roots DPJ blowers, high pressure discharge air is cooled before injecting into the jet plenum. Headplates and the rigid casing are cast from grey iron, with aluminum drive end and gear covers.
PAGE 13
2504 DVJ Blower Performance Table Frame Size Speed RPM Max. Free Air CFM 2504J 2400 2655 2990 3540 3985 4515 4970 170 12" HGV CFM BHP 47 2.1 56 2.3 67 2.6 86 3.1 101 3.6 119 4.1 135 4.6 16" HGV CFM BHP 36 2.8 44 3.1 56 3.5 75 4.2 90 4.7 108 5.4 124 6.0 20" HGV CFM BHP 21 3.5 30 3.9 41 4.4 60 5.2 75 5.9 93 6.7 109 7.
PAGE 14
AF – INLET AF’ – DISCHARGE P P AA’ AA’ AA AW – SYSTEM AIR INLET AF’ – DISCHARGE AW – SYSTEM AIR INLET C DISCH. HORIZONTAL CONFIGURATION Top Discharge Only VERTICAL CONFIGURATION P’ AA C AB AB R’ R’ R’ AX AX AA’ DISCH. +.000 -.001 O INLET INLET DISCH. AA O’ U D +.000 -.
PAGE 15
Horizontal Configuration with left side drive shaft Conﬁgurations Roots blowers are available in two basic configurations to meet nearly any piping arrangement or installation requirement. Orientation for inlet and discharge connections is determined from the drive end: Vertical Configuration: For vertical configuration, one impeller is mounted above the other, unless otherwise noted the blower drive end located opposite the timing gears.
PAGE 16
GE Oil & Gas 16240 Port Northwest Dr., Suite 100 Houston, Texas 77041-2645 Inside US T: +1 877.363.7668 Outside US T: +1 832.590.2600 Visit us online at: www.ge.com/energy 2012 General Electric Company. All Rights Reserved *Trademark of General Electric Company GEA20317_ Roots Small Rotary Blowers Rev 9.