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S-33A93 rev.0608

BASIC BLOWER DESCRIPTION

The ROOTS

patented Universal RAI-J

WHISPAIR

blowers are heavy-duty rotary units featuring a compact,

sturdy design, engineered for continuous service when

operated within speed and vacuum/pressure ratings.

The basic model features a cast-iron casing with a

computer-designed cast relief for noise and shock sup-

pression, 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 withstand V-belt pull.

Detachable rugged steel mounting feet permit easy

in-field adaptablility to either vertical or horizontal

installation requirements.

The Universal RAI-J

incorporates grease lube on

the drive end and splash lube on the gear end. Roots’

exclusive “figure-eight” gearbox design improves oil

distribution to maximize bearing and gear life.

LOWER AIR PULSATION

Patented WHISPAIR

blowers operate

with up to 40% less pressure pulsation

than conventional blowers due to the

pressure equalizing effect of the

WHISPAIR

jet design.

In conventional blowers, as the

impeller opens up to the outlet port, the

higher pressure air in the discharge line

rapidly expands into the lower pressure

pocket formed by the impeller and the

blower case. The resulting shock wave

strikes the advancing surface of the

impeller at near-sonic velocity. Four

pressure pulses occur during each

revolution, transmitting shock loads

to the gear and bearings.

LONGER BEARING LIFE

The pre-pressurization of the low pres-

sure pocket through the WHISPAIR

jet cavity smooths the pulsations,

resulting in less shock being transmitted

through the impellers to the bearings,

providing longer bearing life.

LOWER VIBRATION

The reduction in the magnitude of the

pressure pulsation results in smoother

operation.

LOWER NOISE

The pressure pulses, inherent in the

rotary-lobe design, are also the major

source of blower noise. The rapid

backflow of air into the blower from the

discharge line, four times per revolution,

results in high noise levels in a conven-

tional blower. The WHISPAIR jet design

controls the backflow of air into the

blower, reducing noise by approximately

5 dBA vaccum, 3 dB pressure.

PRESSURE PULSES

SPECIFICATIONS

ROOTS

™

Universal RAI-J

™

WHISPAIR

™

Rotary Positive Blowers

Frames 33J thru 56J

Summary of content (2 pages)

PAGE 1
SPECIFICATIONS ROOTS™ Universal RAI-J™ WHISPAIR™ Rotary Positive Blowers Frames 33J thru 56J BASIC BLOWER DESCRIPTION The ROOTSTM patented Universal RAI-JTM WHISPAIRTM blowers are heavy-duty rotary units featuring a compact, sturdy design, engineered for continuous service when operated within speed and vacuum/pressure ratings.
PAGE 2
S-33A93 rev.0608 ©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. 7.25 7.25 8.00 8.00 10.50 33UJ 36UJ 45UJ 47UJ 56UJ 7.25 7.25 8.00 8.00 10.50 A’ 7.63 10.00 10.00 11.75 11.00 B B 12.13 14.63 15.50 17.63 17.50 C + 000 - 001 5.00 5.00 6.25 6.25 6.25 D 8.50 8.50 10.25 10.25 11.