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Summary of Contents for ROOTS Universal RAI Series
- Page 1 Roots Universal RAI , URAI-DSL, ® ™ URAI-DVJ-DSL, URAI-G & Metric Series ™ Installation operation and maintenance manual www.RootsBlower.com...
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Page 2: Table Of Contents
Contents Information summary Do these things to get the most from your Roots Blower Information summary Check shipment for damage. If found, file claim with carrier and notify Roots. Safety precautions Unpack shipment carefully, and check contents against packing list. -
Page 3: Safety Precautions
Safety precautions Operating limitations It is important that all personnel observe safety precautions to minimize A Roots blower or exhauster must be operated within certain approved the chances of injury. limiting conditions to enable continued satisfactory performance. Warranty is contingent on such operation. -
Page 4: Installation
1/8 inch (3mm) thickness. This allows adjustment of motor position Supervision of the installation by a Roots Service Engineer is not usually in final shaft alignment by varying the shim thickness. required for these units. Workmen with experience in installing light to medium weight machinery should be able to produce satisfactory results. - Page 5 The following requirements of a good installation are recommended. Put oil in the sumps per instructions under Lubrication. When selecting a coupling to be fitted to the blower shaft Roots recommends a taper lock style coupling to insure proper contact with Piping the blower shaft.
- Page 6 Specific recommendations on silencing can be obtained back-flow through an idle unit. from your local Roots distributor. After piping is completed, and before applying power, rotate the drive Discharge piping requires a pressure relief valve, and should include shaft by hand again.
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Page 7: Technical Supplement For Urai-G Blowers
There is a possibility of some gas leakage through the mechanical seals. This leakage on the gear end will escape through the The specified and recommended oil is Roots synthetic oil of correct gear box vent, and on the drive end, through the grease release fittings. -
Page 8: Operation
At this point it is recommended that a pressure gauge or Roots synthetic oil is superior in performance to petroleum based products. It has high oxidation manometer be connected into the discharge line if not already provided, †... - Page 9 During the final run, check operating conditions frequently and observe the oil levels at reasonable intervals. If excessive noise or local heating develops, shut down immediately and determine the cause. If either pressure rise or temperature rise across the blower exceeds the limit specified in this manual, shut down and investigate conditions in the piping system.
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Page 10: Troubleshooting
Troubleshooting checklist Trouble Item Possible Cause Remedy No flow Speed too low Check by tachometer and compare with published performance. Wrong rotation Compare actual rotation with Figure 1, change driver if wrong. Obstruction in piping Check piping, valves, silencer to assure open flow path. Low capacity Speed too low See item 1, if belt drive, check for slippage and re-adjust tension. -
Page 11: Inspection & Maintenance
Wear is confined to the bearings (which support and locate the shafts) and should be referred to your authorized Roots distributor. the oil seals, and the timing gears. All are lubricated and wear should be minimal if clean oil of the correct grade is always used. -
Page 12: Figures
Note: Arc of sheave belt contact on the smaller sheave not to be less than 170°. Driver to be installed on the inlet side for vertical units, and on the drive shaft side for horizontal units. Roots recommends the use of two or more 3VX, 5VX or 8VX belts and sheaves. - Page 13 Figure 3a – Air blower installations with accessories Figure 3b – Gas blower installations with accessories ISRB-2002-19171-0124...
- Page 14 Blower orientation and lubrication points: Grease lubricated drive end Roots Universal RAI series & URAI-G gas blowers Figure 4 – Blower orientation conversion Reversible WHISPAIR* Model rotation design Special Note: WHISPAIR models are designed to operate with only one shaft rotation direction to take full advantage Roots Universal RAI of the WHISPAIR feature.
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Page 15: Tables
Drive end breather orientation for Roots Universal RAI Series – DSL with oil lube Universal RAI DSL Breather Orientation Revised Date: 1/11/05 Table 1 – Universal RAI series, Universal RAI-DSL & URAI-G gas blower, maximum allowable operating conditions Temperature rise Delta pressure... - Page 16 • Oil life is cut in half for every 15-18°F (8-10°C) above 180°F (82°C) oil temperature regardless of oil grade. Mineral based oils at 180°F (82°C) have about 2000 hours of service life where as Roots synthetic oil has about 6000 hours of service life. For mineral based ISO 220 grade oil the expected oil life at the threshold temperature would only be 250 hours, but with Roots synthetic oil it would be 750 hours.
- Page 17 See page 13 and 14 for illustration of vertical and horizontal configurations. Table 4 – Roots Universal RAI series with grease lubricated drive end: Specified bearing greasing intervals The specified grease for servicing drive end bearings of a URAI blower,...
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Page 18: Dvj Section
DVJ Blowers Troubleshooting All troubleshooting points in this manual should be followed with the addition/or supersedure of the following: Information in this section not to conflict with other sections of this manual. Excessive temperature rise - check for possible cylinder slot inlet flow restriction, excessive backpressure on the discharge, and trouble shooting checklist in the appropriate instruction and operation manual. - Page 19 DVJ Blowers are supplied with internal abradable graphite-based coating Figure 2 - Vacuum system schematic for DVJ applications Coating If internal protection from rust or corrosion is required due, for example, to removal of the machine from service, or if the internal protections The coating is basically a fine-grained natural graphite**.
- Page 20 Cleaning before coating Curing procedures For new uncoated surfaces, apply the cleaner with a clean, ‘soaked’ rag. Alternate #1 Apply the cleaner liberally, allow to set for one to two minutes, then wipe Let set for 1-1/2 hours, minimum, at normal room temperature (not less off.
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Page 21: Assembly Drawings
Assembly of Roots Universal RAI Series, Air Blowers, 2-1/2" through 5" gear diameter ISRB-2002-19171-0124... - Page 22 Assembly of Roots Universal RAI blowers, 6" and 7" diameter ISRB-2002-19171-0124...
- Page 23 Assembly of Roots Universal RAI-DSL Series blowers, 3-1/2" through 5" gear diameter ISRB-2002-19171-0124...
- Page 24 Assembly of Roots Universal RAI-DSL Series blowers, 6" gear diameter ISRB-2002-19171-0124...
- Page 25 Assembly of Roots Universal RAI-G Series gas blowers, 3-1/2" through 5" gear diameter ISRB-2002-19171-0124...
- Page 26 Assembly of Roots Universal RAI Series gas blowers, 6" gear diameter ISRB-2002-19171-0124...
- Page 27 Assembly of Roots Universal RAI Series XP blowers, 5” gear diameter ISRB-2002-19171-0124...
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Page 28: Parts List
Quantities vary by blower. † Oil sight glass Quantities vary by blower. † Quantities vary by blower. † Roots Universal RAI DSL Series blowers parts list 6" gear diameter (Refer to drawing #T30382023) Item # Part name Qty. Item # Part name Qty. - Page 29 Roots Universal RAI Series gas blowers parts list Roots 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...
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Page 30: Basic Connection & Drive Shaft Information
1.375 Roots 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. The URAI-DSL is splash lubricated on both ends. - Page 31 1.375 Roots Universal RAI-G gas blowers include detachable mounting feet which permit vertical or horizontal installation. Feet are different for vertical and horizontal mounting. The units are center timed for rotation in either direction. The bearings on the Universal RAI-G are grease lubricated on the drive end and splash lubricated on the gear end.
- Page 32 Roots Universal RAI-J air blowers incorporate the patented WHISPAIR* design in addition to the same features as the original URAI blowers. Roots URAI-J’s are centered timed, however the WHISPAIR benefits can only be realized when the jet is located in the discharge position. Roots U-DVJ DSL air blowers with dual splash lubrication Inlet &...
- Page 33 150 NP 10 Roots 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 34 ISRB-2002-19171-0124...
- Page 35 900 W. Mount St. Connersville Indiana, 47331, USA ©2024 Roots Blowers, LLC All rights reserved. www.RootsBlower.com ISRB-2002-19171-0124 Please recycle after use.
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