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Universal RAI
URAI-J
-DSL, URAI-G
Metric Series
Installation, Operation & Maintenance
Contents
Information Summary ...........................................................1
Safety Precautions ................................................................3
Operating Limitations ............................................................3
Installation ........................................................................ 4-6
Technical Supplement for URAI-G blowers ...........................7
Lubrication .................................................................8, 9, 17
Operation ...........................................................................10
Do These Things To Get The Most From Your ROOTS
o Check shipment for damage. If found, file claim with
carrier and notify Roots.
o Unpack shipment carefully, and check contents against
Packing List. Notify Roots if a shortage appears.
o Store in a clean, dry location until ready for installation.
Lift by methods discussed under INSTALLATION to avoid
straining or distorting the equipment. Keep covers on
all openings. Protect against weather and corrosion if
outdoor storage is necessary.
o Read OPERATING LIMITATIONS and INSTALLATION
sections in this manual and plan the complete installation.
o Provide for adequate safeguards against accidents to
persons working on or near the equipment during both
installation and operation. See SAFETY PRECAUTIONS.
o Install all equipment correctly. Foundation design must be
adequate and piping carefully done. Use recommended
accessories for operating protection.
o Make sure both driving and driven equipment
is correctly lubricated before start-up. See
LUBRICATION.
ISRB-2002 rev. 0710
The original ROOTS blower still leads the way
, URAI-DSL,
®
Troubleshooting ..................................................................11
Inspection & Maintenance ...................................................12
Figures ......................................................................... 13-16
Tables .......................................................................... 16-17
Assembly Drawings ...................................................... 18-23
Parts List ...................................................................... 24-25
o Read starting check points under OPERATION. Run
equipment briefly to check for installation errors and make
corrections. Follow with a trial run under normal operating
conditions.
o In event of trouble during installation or operation, do
not attempt repairs of Roots furnished equipment. Notify
Roots, giving all nameplate information plus an outline
of operating conditions and a description of the trouble.
Unauthorized attempts at equipment repair may void
Roots warranty.
o Units out of warranty may be repaired or adjusted by
the owner. Good inspection and maintenance practices
should reduce the need for repairs.
NOTE: Information in this manual is correct as of the date
of publication. Roots reserves the right to make design or
material changes without notice, and without obligation to
make similar changes on equipment of prior manufacture.
For your nearest Roots Office, dial our Customer Service Hot
Line toll free; 1 877 363 ROOT(S) (7668) or direct 832-590-
2600.
and
blower

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Summary of Contents for Dresser Universal RAI

  • Page 1: Table Of Contents

    The original ROOTS blower still leads the way ™ Universal RAI , URAI-DSL, ® URAI-J -DSL, URAI-G ™ ™ Metric Series Installation, Operation & Maintenance Contents Information Summary ............1 Troubleshooting ..............11 Safety Precautions ..............3 Inspection & Maintenance ...........12 Operating Limitations ............3 Figures .................
  • Page 2: Safety Precautions

    The units’ operating limit is always determined by the proved only for installations where the following temperature maximum rating reached first. It can be any one of the three: limitations can be maintained in service: Pressure, Temperature or Speed. UNIVERSAL RAI , URAI-DSL, URAI-G and Metric Series | 3 ®...
  • Page 3: Installation

    In lifting, keep the direction of cable to be treated as a unit for leveling purposes. Satisfactory instal- pull on these bolts as nearly vertical as possible. If lifting lation can be obtained by setting the baseplate on a concrete 4 | Dresser Roots...
  • Page 4 Before operating the drive under power to check initial belt manufacturer’s recommendations. Maximum deviation in offset tension, first remove covers from the unit connections. Make alignment of the shafts should not exceed .005” (.13 mm) total sure the interior is still clean, then rotate the shaft by hand. indicator reading, taken on the two coupling hubs. Maximum UNIVERSAL RAI , URAI-DSL, URAI-G and Metric Series | 5 ®...
  • Page 5 This will DO NOT operate the unit at this time unless it has been protect against unit overload caused by accidental closing of lubricated per instructions. the shut-off valve. 6 | Dresser Roots...
  • Page 6: Technical Supplement For Urai-G Blowers

    Any small weepage that may occur should ROOTS Universal RAI-GAS rotary positive gas blowers are the seals wear passes into a cavity in each vented headplate a design extension of the basic Universal RAI blower model.
  • Page 7: Lubrication

    ROOTS blowers. • The lubrication/oil level may rise or fall in the gauge • Table 4 page 17 has been prepared as a general during operation to an extent depending somewhat on greasing schedule guide based on average operating oil temperature and blower speed. conditions. More frequent intervals may be necessary 8 | Dresser Roots...
  • Page 8 2-3 times over petroleum based lubricants. Also, ROOTS™ Synthetic oil is 100% compatible with petroleum based oils. Simply drain the oil in the blower and refill the reservoirs with ROOTS™ Synthetic oil to maintain optimum performance of your ROOTS™ blower. UNIVERSAL RAI , URAI-DSL, URAI-G and Metric Series | 9 ®...
  • Page 9: Operation

    Readings from these instruments will show whether pressure or temperature ratings of the blower are being exceeded. During the final run, check operating conditions frequently and observe the oil levels at reasonable intervals. If excessive 10 | Dresser Roots...
  • Page 10: Troubleshooting

    Check oil to ensure it meets recommendations. Drain then fill with clean oil of recommended grade. Blower running hot Check blower operating conditions to ensure they are within the operating limitations defined in this manual. UNIVERSAL RAI , URAI-DSL, URAI-G and Metric Series | 11 ®...
  • Page 11: Inspection & Maintenance

    ROOTS before starting extensive general damage to the blower casing and gears is work. Unauthorized disassembly within the warranty period likely to occur. may void the warranty. Oil seals should be considered expendable items, to be replaced whenever drainage from the headplate vent cavity 12 | Dresser Roots...
  • Page 12: Figures

    Figure 2 - Allowable Overhung Loads for VX-Belt Drives Universal RAI /URAI-J Units ® ™ 252100 • Motor BHP Belt Pull in lbs = Blower RPM• Sheave Diameter in inches Sheave Width (") Shaft load (lb.in) = Belt Pull (lbs) • (A" + ¼" + Max. Allow. Max. Frame Shaft Load Sheave Sheave Size “A” (lb.in) Diameter Width 22, 24 0.61 4.00...
  • Page 13 Figure 3a - Air Blower Installation with Accessories Above are suggested locations for available accessories. Figure 3b -Gas Blower Installation with Accessories 14 | Dresser Roots...
  • Page 14 Shaft; Top discharge • CW Rotation: Bottom Shaft; Left side discharge or a Right Shaft Bottom discharge • CW Rotation: Top Shaft; Right side discharge or a Left Shaft Top discharge Blower Orientation and Lubrication Points: Grease Lubricated Drive End Universal RAI series & URAI-G gas blowers UNIVERSAL RAI , URAI-DSL, URAI-G and Metric Series | 15 ®...
  • Page 15: Tables

    Drive End Breather Orientation for U-RAI series - DSL with Oil Lube Table 1 - Universal RAI series, Universal URAI-DSL & URAI-G gas blower, Maximum Allowable Operating Conditions Temperature Rise Delta Pressure Inlet Vacuum Frame Gear Diam- Speed Size eter (inch) F°...
  • Page 16 Table 3 - Approximate Oil Sump Capacities These capacities are provided to assist in stocking the correct amount of oil. Exact sump capacities may differ slightly. See “Lubrication” section for proper filling instructions. UNIVERSAL RAI , URAI-J, URAI-G UNIVERSAL URAI series-DSL Splash Lubricated Drive End ®...
  • Page 17: Assembly Drawings

    PROFILE OF A SURFACE /PARTS/XXAS REV PER ECN 8-7-86 64720023 TRUE POSITION ÿ DIAMETER STRAIGHTNESS CHANGE FINISH IN MICRO INCHES REVISIONS DATE CHKD. FULL NOTICE FILE\ FORM\ DSIZE.GCM Assembly of UNIVERSAL RAI Series, Air Blowers, 2-1/2" Through 5" Gear Diameter...
  • Page 18 Assembly of UNIVERSAL RAI Blowers, 6" and 7" Diameter...
  • Page 19 PROFILE OF A SURFACE PROTO PICTURE CHANGE 07/25/01 TRUE POSITION ÿ DIAMETER T30099023 STRAIGHTNESS FINISH IN MICRO INCHES CHANGE 0.0000 0.0000 0.0000 REVISIONS DATE CHKD. NOTICE FILE\ FORM\ DSIZE.GCM Assembly of UNIVERSAL RAI-G Series Gas Blowers, 3-1/2" through 5" Gear Diameter...
  • Page 20 Assembly of UNIVERSAL RAI Series Gas Blowers, 6" Gear Diameter...
  • Page 21 Assembly of UNIVERSAL RAI Series - DSL with Splash Lubricated Drive End 3-5" Gear Diameter...
  • Page 22 Assembly of UNIVERSAL RAI Series - DSL with Splash Lubricated Drive End 6" Gear Diameter...
  • Page 23: Parts List

    Universal RAI Series Blowers Parts List Universal RAI Series Blowers Parts List Universal RAI-DSL Series Blowers Parts 2-1/2" – 5" Gear Diameter 6" & 7" Gear Diameter List 3-1/2" – 5" Gear Diameter (Refer to drawing #64720023) (Refer to drawing #64792023)
  • Page 24 Universal RAI Series Gas Blowers Parts List Universal RAI Series Gas Blowers Parts List 3-1/2" & 5" Gear Diameter 6" Gear Diameter (Refer to drawing #T30099023) (Refer to drawing #T3011023) Item Number Part Name Quantity Item Number Part Name Quantity...
  • Page 25: Basic Connection & Drive Shaft Information

    Refer to Specification Sheet S-27S03 Universal RAI air blowers include detachable mounting feet which permit vertical or horizontal installation. The units are center timed for rotation in either direction. The bearings on the URAI are grease lubricated on the drive end and splash lubricated on the gear end.
  • Page 26 2.5" BSP T304550M0 3" BSP 4" BSP Universal RAI-J air blowers incorporate the patented WHISPAIR design in addition to the same features as the original URAI ™ blowers. The URAI-J’s are centered timed, however the WHISPAIR benefits can only be realized when the jet is located in the ™...
  • Page 27 150 NP 10 Universal RAI air blowers include detachable mounting feet which permit vertical or horizontal installation. The units are center timed for rotation in either direction. The bearings on the URAI are grease lubricated on the drive end and splash lubricated on the gear end.

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