GE ROOTS VJ WHISPAI Specification Sheet

SPECIFICATIONS

ROOTS™VJ WHISPAIR

™

Water-Sealed Vacuum Exhauster

Frames 817J thru 832J

BASIC BLOWER DESCRIPTION

ROOTS™WHISPAIR™water-sealed vacuum exhausters
are heavy-duty units designed with integral-shaft ductile
iron impellers. WHISPAIR vacuum exhausters reduce
noise and power loss by utilizing an exclusive wrap­around plenum and proprietary WHISPAIR
pressure equalization – feeding backflow in the direction
of impeller movement, thereby aiding rotation.

The headplates, one-piece casing and end covers are
grey iron. Carburized and ground alloy steel spur timing
gears are taper mounted on the shafts, secured with a
locknut. Cylindrical roller bearings are used.

Piston rings reduce air leakage through the shaft
openings in the headplates, and lip-type oil seals prevent
lubricant from entering the air chamber. WHISPAIR
vacuum exhausters incorporate splash oil lubrication at
both ends of the units. A hydrodynamic seal on the drive
shaft prevents shaft seal oil leaks.

The top shaft is extended for drive on side outlet
vacuum exhausters, and the left or right shaft can be
extended for drive on bottom outlet vacuum exhausters.
An inlet spray nozzle and seal water flow meter are
supplied for water injection.

WARRANTY PERIOD

Twelve (12) months from date of original unit start-up or
18 months from date of original shipment, whichever
occurs first.

™

jet to control

™

DESIGN AND CONSTRUCTION FEATURES

1. Low noise level, less operating power required

2. Improved volumetric efficiency & reduced

3. Alloy steel timing gears

4. Cylindrical roller bearings

5. Piston ring air seals

6. Lip-type oil seals, hydrodynamic drive shaft seal

7. Splash oil lubrication

8. Horizontal and vertical configurations available

operating temperatures

OPERATING PRINCIPLE

S-5597 rev.0608

Incoming air is trapped by the impellers. Simultaneously,
pressurized air (right) is being discharged. As the lower impeller
passes wrap-around flange, Whispair jet equalizes pressure
between trapped air and discharge area, aiding impeller move­ment and reducing power. Impellers move air into the discharge
area (right). Backflow is controlled, resulting in reduction of
noise relative to conventional blowers.

PERFORMANCE TABLE

O

R

C

B

U

D

DISCH.

P

P '

AA

AA

INLET

INLET

DISCH.

A

A'

D1

A

XAX

O'

+.000

-.001

AF - INLET
AF' - DISCHARGE

WATER DRAIN

FRAME SPEED 16” Hg VAC 20” Hg VAC 22” Hg VAC 24” Hg VAC

SIZE RPM CFM BHP CFM BHP CFM BHP CFM BHP

850 948 47.8 840 59 737 64.5 564 70.0

817J 1170 1385 66.9 1258 82 1138 89.5 937 97.1

1800 2265 105.9 2110 128 1962 139.2 1715 150.3

850 1138 56.8 1008 70.2 885 76.8 677 83.5

821J 1170 1662 79.3 1510 97.5 1366 106.5 1124 115.6

1800 2719 125.2 2532 151.9 2355 165.3 2058 178.6

850 1423 70.4 1260 87.1

826J 1170 2078 98.2 1888 120.8

1800 3400 154.2 3166 187.6

850 1707 84.0

832J 1170 2493 116.8

1800 4079 182.9

OTES:

N

. Vacuum ratings based on inlet air at standard temperature of 68°F, discharge pressure of 30” Hg and specific gravity of 1.0.

1

OUTLINE DRAWING & DIMENSIONAL TABLE

NOTES:

1. All dimensions are in inches.

2. Do not use for construction.

Drive Shaft

FRAME A A’ BC O O’ P P’ RU Keyway Inlet Discharge AA AX Net Wt

Location

VERTICAL CONFIGURATION

(Horizontal Air Flow)

HORIZONTAL CONFIGURATION

(Vertical Air Flow)

AF AF’ Approx.

SIZE D D1 Diameter Diameter (lbs)

817J 13.75 22.00 24.25 38.63 21.00 13.00 30.00 25.75 25.50 25.00 17.00 2.750 .625 x .313 10.0 FLG 10.0 FLG 12.75 4.00 1620

821J 13.75 22.00 27.88 42.25 21.00 13.00 30.00 25.75 25.50 25.00 17.00 2.750 .625 x .313 12.0 FLG 10.0 FLG 12.75 4.00 1800

826J 13.75 22.00 33.13 47.50 21.00 13.00 30.00 25.75 25.50 25.00 17.00 2.750 .625 x .313 12.0 FLG 12.0 FLG 12.75 4.00 2075

832J 13.75 22.00 38.50 52.88 21.00 13.00 30.00 15.75 25.50 25.00 17.00 2.750 .625 x .313 14.0 FLG 12.0 FLG 12.75 4.00 2325

Dresser Roots

Houston, Texas Headquarters • U.S. Toll Free Phone: [phone]-ROOT(S) (7668) • Direct Phone: [phone]
Connersville, Indiana Operations • U.S. Toll Free Phone: [phone] • Direct Phone: [phone]
United Kingdom Operations • Phone: [phone]
USA/Canada Sales • Phone: [phone]
Houston, Texas Factory Service • Phone: [phone]
Mexico City Sales and Factory Service • Phone: [phone]
Dubai Sales and Factory Service • Phone: [phone]
Malaysia Sales • Phone: [phone]
China Sales • Phone: [phone]
Shanghai Factory Service • Phone: [phone]

©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-5597 rev.0608

www.dresser.com/rootsblower s