INSTALLATION,OPERATION&MAINTENANCE UniversalRAI ,URAI … · 2012. 6. 4. · 2 ROOTS ™ productsaresoldsubjecttothe currentGeneralTermsofSale,GTS-5001and WarrantyPolicyWP-5020.Copiesare

� Read starting check points under OPERATION. Runequipment briefly to check for installation errors andmake corrections. Follow with a trial run under normaloperating conditions.

� In event of trouble during installation or operation, donot attempt repairs of Roots furnished equipment. NotifyRoots, giving all nameplate information plus an outlineof operating conditions and a description of the trouble.Unauthorized attempts at equipment repair may voidRoots warranty.

� Units out of warranty may be repaired or adjusted by theowner. Good inspection and maintenance practicesshould reduce the need for repairs.

NOTE: Information in this manual is correct as of the date ofpublication. Roots reserves the right to make design ormaterial changes without notice, and without obligation tomake similar changes on equipment of prior manufacture.

For your nearest Roots Office, dial our Customer Service HotLine toll free; 1 877 363 ROOT(S) (7668) or direct 832-590-2600.

Do These Things To Get The Most From Your ROOTS™ blower

Contents

Information Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Operating Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Technical Supplement for URAI-G blowers . . . . . . . . . . . . . . 7

Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8, 9, 16

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

� Check shipment for damage. If found, file claim with car-rier and notify Roots.

� Unpack shipment carefully, and check contents againstPacking List. Notify Roots if a shortage appears.

� Store in a clean, dry location until ready for installation.Lift by methods discussed under INSTALLATION toavoid straining or distorting the equipment. Keep coverson all openings. Protect against weather and corrosion ifoutdoor storage is necessary.

� Read OPERATING LIMITATIONS and INSTALLATION sec-tions in this manual and plan the complete installation.

� Provide for adequate safeguards against accidents topersons working on or near the equipment during bothinstallation and operation. See SAFETY PRECAUTIONS.

� Install all equipment correctly. Foundation design mustbe adequate and piping carefully done. Use recommend-ed accessories for operating protection.

� Make sure both driving and driven equipment is correctlylubricated before start-up. See LUBRICATION.

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Inspection & Maintenance. . . . . . . . . . . . . . . . . . . . . . . . 12

Figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-16

Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-17

Assembly Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . .18-23

Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-25

Basic Connection & Drive Shaft Information. . . . . . . . . 26-28

ISRB-2002 rev.0209

INSTALLATION, OPERATION & MAINTENANCE

Universal RAI®, URAI-J™,URAI-DSL, URAI-J™ DSL, URAI-G™

and Metric Series Blowers

2

ROOTS™ products are sold subject to the

current General Terms of Sale, GTS-5001 and

Warranty Policy WP-5020. Copies are

available upon request.

Contact your local Roots Office

or Roots Customer Service

Hot Line 1-877-363-ROOT(S) (7668) or

direct 832-590-2600.

3For your nearest Roots office contact information, please consult the last page of this document.

Safety Precautions

Operating Limitations

A ROOTS blower or exhauster must be operated within cer-tain approved limiting conditions to enable continued satis-factory performance. Warranty is contingent on such opera-tion.

Maximum limits for pressure, temperature and speed arespecified in TABLE 1 for various models & sizes of blowers &exhausters. These limits apply to all units of normal con-struction, when operated under standard atmospheric condi-tions. Be sure to arrange connections or taps for instru-ments, thermometers and pressure or vacuum gauges at ornear the inlet and discharge connections of the unit. These,along with a tachometer, will enable periodic checks of oper-ating conditions.

PRESSURE – The pressure rise, between inlet and discharge,must not exceed the figure listed for the specific unit framesize concerned. Also, in any system where the unit inlet is ata positive pressure above atmosphere a maximum case rat-ing of 25 PSI gauge (1725 mbar) should not be exceededwithout first consulting Roots. Never should the maximumallowable differential pressure be exceeded.

On vacuum service, with the discharge to atmospheric pres-sure, the inlet suction or vacuum must not be greater thanvalues listed for the specific frame size.

TEMPERATURE – Blower & exhauster frame sizes areapproved only for installations where the following tempera-ture limitations can be maintained in service:

• Measured temperature rise must not exceed listed val-ues when the inlet is at ambient temperature. Ambientis considered as the general temperature of the spacearound the unit. This is not outdoor temperature unlessthe unit is installed outdoors.

• If inlet temperature is higher than ambient, the listedallowable temperature rise values must be reduced by2/3 of the difference between the actual measured inlettemperature and the ambient temperature.

• The average of the inlet and discharge temperature mustnot exceed 250°F. (121°C).

• The ambient temperature of the space the blower/motoris installed in should not be highter than 120°F (48.8°C).

SPEED – These blowers & exhausters may be operated atspeeds up to the maximum listed for the various frame sizes.They may be direct coupled to suitable constant speed driv-ers if pressure/temperature conditions are also within limits.At low speeds, excessive temperature rise may be a limitingfactor.

Special Note: The listed maximum allowable temperature risefor any particular blower & exhauster may occur well beforeits maximum pressure or vacuum rating is reached. Thismay occur at high altitude, low vacuum or at very low speed.The units’ operating limit is always determined by the maxi-mum rating reached first. It can be any one of the three:Pressure, Temperature or Speed.

It is important that all personnel observe safety precautionsto minimize the chances of injury. Among many considera-tions, the following should be particularly noted:

• Blower casing and associated piping or accessories maybecome hot enough to cause major skin burns on con-tact.

• Internal and external rotating parts of the blower anddriving equipment can produce serious physical injuries.Do not reach into any opening in the blower while it isoperating, or while subject to accidental starting. Protectexternal moving parts with adequate guards.

• Disconnect power before doing any work, and avoidbypassing or rendering inoperative any safety or protec-tive devices.

• If blower is operated with piping disconnected, place astrong coarse screen over the inlet and avoid standing inthe discharge air stream. CAUTION: Never cover theblower inlet with your hand or other part of body.

• Stay clear of the blast from pressure relief valves and thesuction area of vacuum relief valves.

• Use proper care and good procedures in handling, lifting,installing, operating and maintaining the equipment.

• Casing pressure must not exceed 25 PSI (1725 mbar)gauge. Do not pressurize vented cavities from an externalsource, nor restrict the vents without first consultingROOTS.

• Do not use air blowers on explosive or hazardous gases.

• Other potential hazards to safety may also be associatedwith operation of this equipment. All personnel workingin or passing through the area should be trained to exer-cise adequate general safety precautions.

4

ROOTS blowers & exhausters are treated after factoryassembly to protect against normal atmospheric corrosion.The maximum period of internal protection is considered tobe one year under average conditions, if shipping plugs &seals are not removed. Protection against chemical or saltwater atmosphere is not provided. Avoid opening the unituntil ready to start installation, as corrosion protection willbe quickly lost due to evaporation.

If there is to be an extended period between installation andstart up, the following steps should be taken to ensure corro-sion protection.

� Coat internals of cylinder, gearbox and drive end bearingreservoir with Nox-Rust VCI-10 or equivalent. Repeatonce a year or as conditions may require. Nox-RustVCI-10 is petroleum soluble and does not have to beremoved before lubricating. It may be obtained fromDaubert Chemical Co., 2000 Spring Rd., Oak Brook, Ill.60521.

� Paint shaft extension, inlet and discharge flanges, and allother exposed surfaces with Nox-Rust X-110 or equiva-lent.

� Seal inlet, discharge, and vent openings. It is not rec-ommended that the unit be set in place, piped to thesystem, and allowed to remain idle for extended periods.If any part is left open to the atmosphere, the Nox-RustVCI-10 vapor will escape and lose its effectiveness.

� Protect units from excessive vibration during storage.

� Rotate shaft three or four revolutions every two weeks.

� Prior to start up, remove flange covers on both inlet anddischarge and inspect internals to insure absence ofrust. Check all internal clearances. Also, at this time,remove gearbox and drive end bearing cover and inspectgear teeth and bearings for rust.

Because of the completely enclosed unit design, location ofthe installation is generally not a critical matter. A clean, dryand protected indoor location is preferred. However, an out-door location will normally give satisfactory service.Important requirements are that the correct grade of lubricat-ing oil be provided for expected operating temperatures, andthat the unit be located so that routine checking and servic-ing can be performed conveniently. Proper care in locatingdriver and accessory equipment must also be considered.

Supervision of the installation by a ROOTS Service Engineeris not usually required for these units. Workmen with experi-ence in installing light to medium weight machinery shouldbe able to produce satisfactory results. Handling of theequipment needs to be accomplished with care, and in com-pliance with safe practices. Unit mounting must be solid,without strain or twist, and air piping must be clean, accu-rately aligned and properly connected.

Bare-shaft Units: Two methods are used to handle a unitwithout base. One is to use lifting lugs bolted into the top ofthe unit headplates. Test them first for tightness and frac-

Installation

tures by tapping with a hammer. In lifting, keep the directionof cable pull on these bolts as nearly vertical as possible. Iflifting lugs are not available, lifting slings may be passedunder the cylinder adjacent to the headplates. Either methodprevents strain on the extended drive shaft.

Packaged Units: When the unit is furnished mounted on abaseplate, with or without a driver, use of lifting slings pass-ing under the base flanges is required. Arrange these slingsso that no strains are placed on the unit casing or mountingfeet, or on any mounted accessory equipment. DO NOT usethe lifting lugs in the top of the unit headplates.

Before starting the installation, remove plugs, covers or sealsfrom unit inlet and discharge connections and inspect theinterior completely for foreign material. If cleaning isrequired, finish by washing the cylinder, headplates andimpeller thoroughly with an appropriate solvent. Turn thedrive shaft by hand to make sure that the impellers turnfreely at all points. Anti-rust compound on the connectionflanges and drive shaft extension may also be removed atthis time with the same solvent. Cover the flanges untilready to connect piping.

MountingCare will pay dividends when arranging the unit mounting.This is especially true when the unit is a “bare-shaft” unit fur-nished without a baseplate. The convenient procedure maybe to mount such a unit directly on a floor or small concretepad, but this generally produces the least satisfactory results.It definitely causes the most problems in leveling and align-ment and may result in a “Soft Foot” condition. Correct softfoot before operation to avoid unnecessary loading on thecasing and bearings. Direct use of building structural fram-ing members is not recommended.

For blowers without a base, it is recommended that a wellanchored and carefully leveled steel or cast iron mountingplate be provided. The plate should be at least 1 inch (25mm) thick, with its top surface machined flat, and largeenough to provide leveling areas at one side and one endafter the unit is mounted. It should have properly sizedstuds or tapped holes located to match the unit foot drilling.Proper use of a high quality machinist’s level is necessary foradequate installation.

With the mounting plate in place and leveled, set the unit onit without bolting and check for rocking. If it is not solid,determine the total thickness of shims required under onefoot to stop rocking. Place half of this under each of thediagonally-opposite short feet, and tighten the mountingstuds or screws. Rotate the drive shaft to make sure theimpellers turn freely. If the unit is to be direct coupled to adriving motor, consider the height of the motor shaft and thenecessity for it to be aligned very accurately with the unitshaft. Best unit arrangement is directly bolted to the mount-ing plate while the driver is on shims of at least 1/8 inch(3mm) thickness. This allows adjustment of motor positionin final shaft alignment by varying the shim thickness.

AligningWhen unit and driver are factory mounted on a commonbaseplate, the assembly will have been properly aligned andis to be treated as a unit for leveling purposes. Satisfactory


installation can be obtained by setting the baseplate on a con-crete slab that is rigid and free of vibration, and leveling thetop of the base carefully in two directions so that it is free oftwist. The slab must be provided with suitable anchor bolts.The use of grouting under and partly inside the leveled andshimmed base is recommended.

It is possible for a base-mounted assembly to become twist-ed during shipment, thus disturbing the original alignment.For this reason, make the following checks after the base hasbeen leveled and bolted down. Disconnect the drive androtate the unit shaft by hand. It should turn freely at allpoints. Loosen the unit foot hold-down screws and deter-mine whether all feet are evenly in contact with the base. Ifnot, insert shims as required and again check for freeimpeller rotation. Finally, if unit is direct coupled to the driv-er, check shaft and coupling alignment carefully and makeany necessary corrections.

In planning the installation, and before setting the unit, con-sider how piping arrangements are dictated by the unit designand assembly. Drive shaft rotation must be establishedaccordingly and is indicated by an arrow near the shaft.

Typical arrangement on vertical units has the drive shaft atthe top with counterclockwise rotation and discharge to theleft. Horizontal units are typically arranged with the driveshaft at the left with counterclockwise rotation and dischargedown. See Figure 4 for other various unit arrangements andpossible conversions.

When a unit is DIRECT COUPLED to its driver, the driver RPMmust be selected or governed so as not to exceed the maxi-mum speed rating of the unit. Refer to Table 1 for allowablespeeds of various unit sizes.

A flexible type coupling should always be used to connect thedriver and unit shafts.

When direct coupling a motor or engine to a blower you mustinsure there is sufficient gap between the coupling halves andthe element to prevent thrust loading the blower bearings.When a motor, engine or blower is operated the shafts mayexpand axially. If the coupling is installed in such a mannerthat there is not enough room for expansion the blower shaftcan be forced back into the blower and cause the impeller tocontact the gear end headplate resulting in damage to theblower. The two shafts must be in as near perfect alignmentin all directions as possible, and the gap must be establishedwith the motor armature on its electrical center if end-playexists. Coupling manufacturer’s recommendations for maxi-mum misalignment, although acceptable for the coupling, arenormally too large to achieve smooth operation and maxi-mum life of the blower.

The following requirements of a good installation are recom-mended. When selecting a coupling to be fitted to the blowershaft ROOTS recommends a taper lock style coupling to insureproper contact with the blower shaft. If the coupling must havea straight bore the coupling halves must be fitted to the twoshafts with a line to line thru .001” interference fit. Couplinghalves must be warmed up per coupling manufacturer’s recom-mendations. Maximum deviation in offset alignment of theshafts should not exceed .005” (.13 mm) total indicator reading,taken on the two coupling hubs. Maximum deviation from par-allel of the inside coupling faces should not exceed .001” (.03mm) when checked at six points around the coupling.

When a unit is BELT DRIVEN, the proper selection of sheave

diameters will result in the required unit speed. When select-ing a sheave to be fitted to the blower shaft ROOTS recom-mends a taper lock style sheave to insure proper contact withthe blower shaft. This flexibility can lead to operating temper-ature problems caused by unit speed being too low. Makesure the drive speed selected is within the allowable range forthe specific unit size, as specified under Table 1.

Belt drive arrangements usually employ two or more V-beltsrunning in grooved sheaves. Installation of the driver is lesscritical than for direct coupling, but its shaft must be leveland parallel with the unit shaft. The driver should be mount-ed on the inlet side of a vertical unit (horizontal piping) andon the side nearest to the shaft on a horizontal unit. SEEPAGE 6 - Acceptable Blower Drive Arrangement Options. Thedriver must also be mounted on an adjustable base to permitinstalling, adjusting and removing the V-belts. To positionthe driver correctly, both sheaves need to be mounted ontheir shafts and the nominal shaft center distance known forthe belt lengths to be used.

CAUTION: Drive couplings and sheaves (pulleys) should havean interference fit to the shaft of the blower (set screw typesof attachment generally do not provide reliable service.) It isrecommended that the drive coupling or sheave used have ataper lock style bushing which is properly sized to provide thecorrect interference fit required. Drive couplings, that requireheating to fit on the blower shaft, should be installed per cou-pling manufacturer recommendations. A drive coupling orsheave should not be forced on to the shaft of the blower asthis could affect internal clearances resulting in damage tothe blower.

Engine drive applications often require special considerationto drive coupling selection to avoid harmful torsional vibra-tions. These vibrations may lead to blower damage if notdampened adequately. It is often necessary to install a fly-wheel and/or a torsionally soft elastic element couplingbased on the engine manufacturer recommendations.

The driver sheave should also be mounted as close to itsbearing as possible, and again should fit the shaft correctly.Position the driver on its adjustable base so that 2/3 of thetotal movement is available in the direction away from theunit, and mount the assembly so that the face of the sheaveis accurately in line with the unit sheave. This position mini-mizes belt wear, and allows sufficient adjustment for bothinstalling and tightening the belts. After belts are installed,adjust their tension in accordance with the manufacturer’sinstructions. However, only enough tension should beapplied to prevent slippage when the unit is operating underload. Excessive tightening can lead to early bearing concernsor shaft breakage.

Before operating the drive under power to check initial belttension, first remove covers from the unit connections. Makesure the interior is still clean, then rotate the shaft by hand.Place a coarse screen over the inlet connection to preventanything being drawn into the unit while it is operating, andavoid standing in line with the discharge opening. Put oil inthe sumps per instructions under LUBRICATION.

PipingBefore connecting piping, remove any remaining anti-rustcompound from unit connections. Clean pipe should be nosmaller than unit connections. In addition, make sure it isfree of scale, cuttings, weld beads, or foreign material of any

6

kind. To further guard against damage to the unit, especiallywhen an inlet filter is not used, install a substantial screen of16 mesh backed with hardware cloth at or near the inlet con-nections. Make provisions to clean this screen of collecteddebris after a few hours of operation. It should be removedwhen its usefulness has ended, as the wire will eventuallydeteriorate and small pieces going into the unit may causeserious damage.

Pipe flanges or male threads must meet the unit connectionsaccurately and squarely. DO NOT attempt to correct mis-alignment by springing or cramping the pipe. In most casesthis will distort the unit casing and cause impeller rubbing.In severe cases it can prevent operation or result in a brokendrive shaft. For similar reasons, piping should be supportednear the unit to eliminate dead weight strains. Also, if pipeexpansion is likely to occur from temperature change, instal-lation of flexible connectors or expansion joints is advisable.

Figure 3 represents an installation with all accessory itemsthat might be required under various operating conditions.Inlet piping should be completely free of valves or otherrestrictions. When a shut-off valve can not be avoided, makesure a full size vacuum relief is installed nearest the unit inlet.This will protect against unit overload caused by accidentalclosing of the shut-off valve.

Need for an inlet silencer will depend on unit speed and pres-sure, as well as sound-level requirements in the general sur-roundings. An inlet filter is recommended, especially in dustyor sandy locations. A discharge silencer is also normallysuggested, even though Whispair units operate at generallylower noise levels than conventional rotary blowers. Specificrecommendations on silencing can be obtained from yourlocal ROOTS distributor.

Discharge piping requires a pressure relief valve, and shouldinclude a manual unloading valve to permit starting the unitunder no-load conditions. Reliable pressure/vacuum gaugesand good thermometers at both inlet and discharge are rec-ommended to allow making the important checks on unit

operating conditions. The back-pressure regulator shown inFigure 3 is useful mainly when volume demands vary whilethe unit operates at constant output. If demand is constant,but somewhat lower than the unit output, excess may beblown off through the manual unloading valve.

In multiple unit installations where two or more units operatewith a common header, use of check valves is mandatory.These should be of a direct acting or free swinging type, withone valve located in each line between the unit and header.Properly installed, they will protect against damage fromreverse rotation caused by air and material back-flow throughan idle unit.

After piping is completed, and before applying power, rotatethe drive shaft by hand again. If it does not move with uni-form freedom, look for uneven mounting, piping strain,excessive belt tension or coupling misalignment.

DO NOT operate the unit at this time unless it has been lubri-cated per instructions.

Motor On Inlet Side of Blower (Top Shaft)

Motor On Inlet Side of Blower (Bottom Shaft)

Motor On Discharge Side of Blower (Top Shaft)

Motor On Discharge Side of Blower (Bottom Shaft)

INLETDISCHARGE

Top Shaft

INLETDISCHARGE

Bottom Shaft

INLETDISCHARGE

Top Shaft

INLETDISCHARGE

Bottom Shaft

Acceptable Blower Drive Arrangement OptionsACCEPTABLE UNACCEPTABLE


Technical Supplement for 32, 33, 36, 42, 45, 47, 53, 56, 59,65, 68, 615 Universal RAI-GAS blowers

Precaution: URAI-GAS blowers: Care must be used whenopening the head plate seal vent chamber plugs (43) assome gas will escape–if it is a pressure system, or theatmospheric air will leak into the blower if the system isunder vacuum. There is a possibility of some gas leakagethrough the mechanical seals. This leakage on the gear endwill escape through the gear box vent, and on the drive end,through the grease release fittings. If the gas leakage isundesirable, each seal chamber must be purged with aninert gas through one purge gas hole (43) per seal. Thereare two plugged purge gas holes (1/8 NPT) provided perseal. The purge gas pressure must be maintained one PSIabove the discharge gas pressure. Also, there exists a possi-bility of gear end oil and drive end grease leakage into thegas stream.

ROOTS Universal RAI-GAS rotary positive gas blowers are adesign extension of the basic Universal RAI blower model.URAI-GAS blower uses (4) mechanical seals in place of thestandard inboard lip seals to minimize gas leakage into theatmosphere.

These units are intended for gases which are compatible withcast iron case material, steel shafts, 300/400 series stainlesssteel and carbon seal components, viton o-rings and theoil/grease lubricants. If there are any questions regardingapplication or operation of this gas blower, please contactfactory.

A simple but very effective lubrication system is employedon the drive shaft end bearings. Hydraulic pressure relieffittings are provided to vent any excess grease, preventingpressure build-up on the seals. A restriction plug andmetering orifice prevent loss of lubricant from initial surgesin lubricant pressure but permit venting excess lubricantunder steadily rising pressures.

Using a pressure gun, slowly force new lubricant into eachdrive end bearing housing until traces of clean grease comesout of the relief fitting. The use of an electric or pneumaticgrease gun could force the grease in too rapidly and thusinvert the seals and should not be used.

Gear end bearings, gears and oil seals are lubricated by theaction of the timing gears which dip into the main oil sumpscausing oil to splash directly on gears and into bearings andseals. A drain port is provided below each bearing to preventan excessive amount of oil in the bearings. Seals locatedinboard of the bearings in each headplate effectively retain oilwithin the sumps. Any small weepage that may occur shouldthe seals wear passes into a cavity in each vented headplateand is drained downward.

Proper lubrication is usually the most important single con-sideration in obtaining maximum service life and satisfactoryoperation from the unit. Unless operating conditions aresevere, a weekly check of oil level and necessary additionof lubricant should be sufficient.

Technical Supplement for Universal RAI-G™ Gas Blowers

During the first week of operation, check the oil levels in the oilsumps about once a day, and watch for leaks. Replenish asnecessary. Thereafter, an occasional check should be sufficient.

More frequent oil service may be necessary if the blower isoperated in a very dusty location.

8

Due to sludge build-up and seal leakage problems, Rootsrecommendation is DO NOT USE Mobil SHC synthetic oilsin Roots blowers.

URAI AIR and GAS gear end bearing lubrication/oilwith splash lubrication on the gear end only (Driveend grease lubricated).

• The specified and recommended oil is ROOTS™Synthetic oil of correct viscosity per Table 2, page 17.

• To fill the gearbox, remove the breather plug (25) and the oiloverflow plug (21) - see page 17. Fill the reservoir up to theoverflow hole. DO NOT OVERFILL. Place the breather andthe overflow plug back into their respective holes.

• The lubrication should be changed after initial 100 hoursof operation.

• Proper service intervals of the oil thereafter are based onthe discharge air temperature of the blower. Please referto the information below to “How to properly determinethe oil service intervals” shown on this page.

• If you choose to use another oil other than the specifiedand recommended ROOTS™ Synthetic, use a goodgrade of industrial type non-detergent, rust inhibiting,anti-foaming oil and of correct viscosity per Table 2,page 17.

• Roots does NOT recommend the use of automotive typelubricants, as they are not formulated with the propertiesmentioned above.

URAI-DSL blowers with splash lubrication/oil oneach end. No grease.

• The specified and recommended oil is ROOTS™Synthetic oil of correct viscosity per Table 2, page 17.

• The proper oil level should be half way or middle of thesight gauge when the blower is not operating. DO NOTOVERFILL OIL SUMP/S as damage to the blower mayoccur.

• Oil level may rise or fall in the gauge during operation toan extent depending somewhat on oil temperature andblower speed.

• The oil level should not fall below the middle of the sitegauge when the blower is idle.

• The lubrication should be changed after initial 100 hoursof operation.

• Proper service intervals of the oil thereafter are based onthe discharge air temperature of the blower. Please referto the information below to “How to properly determinethe oil service intervals” shown on this page

Lubrication

• If you choose to use another oil other than the specifiedand recommended ROOTS™ Synthetic, use a good gradeof industrial type non-detergent, rust inhibiting, anti-foaming oil and of correct viscosity per Table 2, page 17.

• Roots does NOT recommend the use of automotive typelubricants, as they are not formulated with the propertiesmentioned above.

How to properly determine the oil service intervals.Normal life expectancy of the specified and recommendedROOTS™ Synthetic oil is approximately 6000 hours with anoil temperature of 180°F (82°C) or less. As the oil temperatureincreases by increments of 15°F (8°C), the oil life is reducedby half for each 15°F (8°C) increase. Example: Oil tempera-tures of 195°F (90.5°C) will produce a life expectancy reducedby half or 3000 hours oil service life.

Normal life expectancy of petroleum based oils is about 2000hours with an oil temperature of about 180°F (82°C). As theoil temperature increases by increments of 15°F (8°C), the lifeis reduced by half for each 15°F (8°C) increase. Example: Oiltemperatures of 195°F (90.5°C) will produce life expectancyreduced by half or 1000 hours oil service life.

NOTE: To estimate oil temperature, multiply the dischargetemperature of the blower by 0.80. Example: if the dischargeair temperature of the blower is 200° F, it is estimated thatthe oil temperature is 160° F

For Units with grease lubricated drive end bearings.URAI AIR (Non GAS) blower grease specifications.

• When servicing drive end bearings of a AIR (Non Gas)blower, use the specified and recommended Shell DarinaSD 2 NLGI #2 product code 506762B.

• For grease lubricated drive end blowers see page 17,table 4, regarding specified greasing intervals.

• Lithium based greases are not compatible with thespecified and recommended Shell Darina SD 2 greaseused when assembling the blower. Lithium based greaseis not approved for any ROOTS blowers.

• Table 4 page 17 has been prepared as a general greasingschedule guide based on average operating conditions.More frequent intervals may be necessary depending on thegrease operating temperature and unusual circumstances.

URAI GAS blower grease specifications.

• When servicing drive end bearings of a URAI GAS blower,use the specified NLGI #2 premium grade aluminumcomplex* grease, ROOTS P/N T20019001.

• Lithium based greases are not compatible with thespecified and recommended ROOTS Synthetic greaseused when assembling a GAS blower. Lithium basedgrease is not approved for any ROOTS blowers.


• Lithium based greases are not compatible with the specifiedand recommended ROOTS Synthetic grease used whenassembling a GAS blower. Lithium based grease is notapproved for any ROOTS blowers.

• The lubricants selected must be compatible with the gas.

*ROOTS Synthetic Oil & Grease is superior in performance toother synthetic lubrications. It has high oxidation stability,excellent corrosion protection, extremely high film strengthand low coefficient of friction.

*ROOTS™ Synthetic oil is superior in performance to petroleum based prod-ucts. It has high oxidation stability, excellent corrosion protection, extremelyhigh film strength and low coefficient of friction. Typical oil change intervals areincreased 2-3 times over petroleum based lubricants. Also, ROOTS™ Syntheticoil is 100% compatible with petroleum based oils. Simply drain the oil in theblower and refill the reservoirs with ROOTS™ Synthetic oil to maintain optimumperformance of your ROOTS™ blower.

10

Before operating a blower under power for the first time,recheck the unit and the installation thoroughly to reduce thelikelihood of avoidable troubles. Use the following procedurecheck list as a guide, but consider any other special condi-tions in the installation.

� Be certain that no bolts, tools, rags, or debris have beenleft in the blower air chamber or piping.

� If an outdoor intake without filter is used, be sure theopening is located so it cannot pick up dirt and is pro-tected by a strong screen or grille. Use of the temporaryprotective screen as described under INSTALLATION isstrongly recommended.

� Recheck blower leveling, drive alignment and tightnessof all mounting bolts if installation is not recent. If beltdrive is used, adjust belt tension correctly.

� Turn drive shaft by hand to make sure impellers stillrotate without bumping or rubbing at any point.

� Ensure oil levels in the main oil sumps are correct.

� Check lubrication of driver. If it is an electric motor, besure that power is available and that electrical overloaddevices are installed and workable.

� Open the manual unloading valve in the discharge airline. If a valve is in the inlet piping, be sure it is open.

� Bump blower a few revolutions with driver to check thatdirection of rotation agrees with arrow near blowershaft, and that both coast freely to a stop.

After the preceding points are cleared, blower is ready fortrial operation under “no-load” conditions. The followingprocedure is suggested to cover this initial operation testperiod.

a. Start blower, let it accelerate to full speed, then shut off.Listen for knocking sounds, both with power on and asspeed slows down.

b. After blower comes to a complete stop, repeat above,but let blower run 2 or 3 minutes. Check for noises,such as knocking sounds.

c. After blower comes to a complete stop, operate blowerfor about 10 minutes unloaded. Check oil levels.Observe cylinder and headplate surfaces for develop-ment of hot spots such as burned paint, indicatingimpeller rubs. Be aware of any noticeable increase invibration.

Assuming that all trials have been satisfactory, or that neces-sary corrections have been made, the blower should nowhave a final check run of at least one hour under normaloperating conditions. After blower is restarted, gradually

close the discharge unloading valve to apply working pres-sure. At this point it is recommended that a pressure gaugeor manometer be connected into the discharge line if notalready provided, and that thermometers be in both inlet anddischarge lines. Readings from these instruments will showwhether pressure or temperature ratings of the blower arebeing exceeded.

During the final run, check operating conditions frequentlyand observe the oil levels at reasonable intervals. If excessivenoise or local heating develops, shut down immediately anddetermine the cause. If either pressure rise or temperaturerise across the blower exceeds the limit specified in thismanual, shut down and investigate conditions in the pipingsystem. Refer to the TROUBLESHOOTING CHECKLIST forsuggestions on various problems that may appear.

The blower should now be ready for continuous duty opera-tion at full load. During the first few days make periodicchecks to determine whether all conditions remain steady, orat least acceptable. This may be particularly important if theblower is supplying air to a process system where conditionscan vary. At the first opportunity, stop the blower and cleanthe temporary inlet protective screen. If no appreciableamount of debris has collected, the screen may be removed.See comments under INSTALLATION. At this same time, veri-fy leveling, coupling alignment or belt tension, and mountingbolt tightness.

Should operating experience prove that blower capacity is alittle too high for the actual air requirements, a small excessmay be blown off continuously through the manual unload-ing or vent valve. Never rely on the pressure relief valve asan automatic vent. Such use may cause the discharge pres-sure to become excessive, and can also result in unsafeoperation of the valve itself. If blower capacity appears to betoo low, refer to the TROUBLESHOOTING CHECKLIST.

Vibration Assessment CriteriaWith measurements taken at the bearing locations on thehousings, see chart below for an appropriate assessmentguide for rotary lobe blowers rigidly mounted on stiff founda-tions.

In general, blower vibration levels should be monitored on aregular basis and the vibration trend observed for progres-sive or sudden change in level. If such a change occurs, thecause should be determined through spectral analysis.

As shown on the chart below, the level of all pass vibrationwill determine the need to measure discrete frequency vibra-tion levels and the action required.

Operation

All Pass Vibration Discrete Frequency Action(in/sec) Vibration (in/sec)

0.45 or less N/R AcceptableGreater than 0.45 0.45 or less @ Acceptablebut 1.0 or less any frequency

Greater than 0.45 @ Investigateany frequency

Greater than 1.0 Less than 1.0 InvestigateGreater than 1.0 Investigate


Troubleshooting Checklist

Trouble Item Possible Cause Remedy

No flow 1 Speed too low Check by tachometer and compare with publishedperformance

2 Wrong rotation Compare actual rotation with Figure 1Change driver if wrong

3 Obstruction in piping Check piping, valves, silencer to assure open flow pathLow capacity 4 Speed too low See item 1, If belt drive, check for slippage and readjust

tension5 Excessive pressure rise Check inlet vacuum and discharge pressure and compare

with Published performance6 Obstruction in piping See item 37 Excessive slip Check inside of casing for worn or eroded surfaces causing

excessive clearancesExcessive power 8 Speed too high Check speed and compare with published performance

9 Excessive pressure rise See Item 510 Impeller rubbing Inspect outside of cylinder for high temperature areas, then

check for impeller contact at these points. Correct blowermounting, drive alignment

11 Scale, sludge, rust Clean blower appropriatelyor product build up

Damage to bearings 12 Inadequate lubrication Check oil sump levels in gear and drive end headplatesor gears 13 Excessive lubrication Check oil levels. If incorrect, drain and refill with clean oil of

recommended grade14 Excessive pressure rise See Item 515 Coupling misalignment Check carefully. Realign if questionable16 Excessive belt tension Readjust for correct tension

Vibration 17 Misalignment See Item 1518 Impellers rubbing See Item 1019 Worn bearings/gears Check gear backlash and condition of bearings, and replace

as indicated20 Unbalanced or rubbing Scale or process material may build up on casing and

impeller impellers, or inside impellers. Remove build-up to restoreoriginal clearances and impeller balance

21 Driver or blower loose Tighten mounting bolts securely22 Piping resonances Determine whether standing wave pressure pulsations are

present in the piping23 Scale/sludge build-ups Clean out interior of impeller lobes to restore dynamic

balance24 Casing strain Re-work piping alignment to remove excess strain

Driver stops, or 25 Impeller stuck Check for excessive hot spot on headplate or cylinder.will not start See item 10. Look for defective shaft bearing and/or

gear teeth26 Scale, sludge, rust or Clean blower appropriately

product build-upExcessive breather 27 Broken seal Replace sealsBlow-by or excessive 28 Defective O-ring Replace seals and O-ringoil leakage to vent areaExcessive oil leakage 29 Defective/plugged breather Replace breather and monitor oil leakagein vent area 30 Oil level too high Check sump levels in gear and drive headplates.

31 Oil type or Check oil to insure it meets recommendations. Drain thenviscosity incorrect fill with clean oil of recommended grade.

32 Blower running hot Check blower operating conditions to ensure they are withinthe operating limitations defined in this manual.

12

Inspection & Maintenance: Universal RAI® series blowers

A good program of consistent inspection and maintenance isthe most reliable method of minimizing repairs to a blower. Asimple record of services and dates will help keep this workon a regular schedule. Basic service needs are:

• Lubrication

• Checking for hot spots

• Checking for increases or changes in vibration and noise

• Recording of operating pressures and temperatures

Above all, a blower must be operated within its specified rat-ing limits, to obtain satisfactory service life.

A newly installed blower should be checked often during thefirst month of full-time operation. Attention there after maybe less frequent assuming satisfactory performance.Lubrication is normally the most important consideration andweekly checks of lubricant levels in the gearbox and bearingreservoirs should be customary. Complete oil change sched-ules are discussed under LUBRICATION.

Driver lubrication practices should be in accordance with themanufacturer’s instructions. If direct connected to the blowerthrough a lubricated type coupling, the coupling should bechecked and greased each time blower oil is changed. Thiswill help reduce wear and prevent unnecessary vibration. In abelted drive system, check belt tension periodically andinspect for frayed or cracked belts.

In a new, and properly installed, unit there is no contactbetween the two impellers, or between the impellers andcylinder or headplates. Wear is confined to the bearings(which support and locate the shafts) the oil seals, and thetiming gears. All are lubricated and wear should be minimalif clean oil of the correct grade is always used. Seals are sub-ject to deterioration as well as wear, and may require replace-ment at varying periods.

Shaft bearings are designed for optimum life under averageconditions with proper lubrication and are critical to the serv-ice life of the blower. Gradual bearing wear may allow a shaftposition to change slightly, until rubbing develops betweenimpeller and casing. This will cause spot heating, which canbe detected by observing these surfaces. Sudden bearing sit-uations is usually more serious. Since the shaft and impellerare no longer supported and properly located, extensive gen-eral damage to the blower casing and gears is likely to occur.

Oil seals should be considered expendable items, to bereplaced whenever drainage from the headplate vent cavitybecomes excessive or when the blower is disassembled for

any reason. Some oil seal leakage may occur since an oil filmunder the lip is required for proper operation. Periodicallyleaked oil should be wiped off from surfaces. Minor sealleakage should not be considered as indicating seal replace-ment.

Timing gear wear, when correct lubrication is maintained,should be negligible. Gear teeth are cut to provide the correctamount of backlash, and gears correctly mounted on theshafts will accommodate a normal amount of tooth wearwithout permitting contact between lobes of the twoimpellers. However, too high an oil level will cause churningand excessive heating. This is indicated by unusually hightemperature at the bottom of the gear housing. Consequentheating of the gears will result in loss of tooth-clearance ,backlash and rapid wear of the gear teeth usually will devel-op. Continuation of this tooth wear will eventually produceimpeller contacts (knocking), and from this point seriousdamage will be unavoidable if blower operation is continued.A similar situation can be produced suddenly by gear toothfracture, which is usually brought on by sustained overload-ing or momentary shock loads.

Problems may also develop from causes other than internalparts damage. Operating clearances within a blower are onlya few thousandths of an inch. This makes it possible forimpeller interference or casing rubs to result from shifts inthe blower mounting, or from changes in piping support. Ifthis type of trouble is experienced, and the blower is found tobe clean, try removing mounting strains. Loosen blowermounting bolts and reset the leveling and drive alignment.Then tighten mounting again, and make sure that all pipingmeets blower connections accurately and squarely Foreignmaterials in the blower will also cause trouble, which canonly be cured by disconnecting the piping and thoroughlycleaning the blower interior.

A wide range of causes & solutions for operating troublesare covered in the TROUBLE SHOOTING CHECKLIST. Theremedies suggested should be performed by qualifiedmechanics with a good background. Major repairs generallyare to be considered beyond the scope of maintenance, andshould be referred to an authorized ROOTS distributor.

Warranty situations should not be repaired at all, unless spe-cific approval has been obtained through ROOTS beforestarting work. Unauthorized disassembly within the warrantyperiod may void the warranty.


Figure 2 - Allowable Overhung Loads for V-Belt Drives Universal RAI®/URAI®-J Units

A 1/4" Max

Belt Pull lbs =252100 • Motor HP

Blower RPM • Sheave Diameter

Frame Dim. Max. Allow. Min. Max.Size “A” Shaft Load Sheave Sheave

(lb-in.) Diameter Width

22, 24 0.61 150 4.00 1.7532, 33, 36 0.80 400 5.00 1.9142, 45, 47 1.02 650 5.00 2.3153, 56, 59 1.13 1,325 6.00 3.06

65, 68, 615 1.36 2,250 8.00 3.4476, 711, 718 1.16 3,000 9.50 3.75

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 horizon-tal units.ROOTS recommends the use of two or more 3V, 5V or 8V belts and sheaves.

Shaft Load (lb.in) = Belt Pull • (A + 1/4” + )Sheave Width

2

Motor On Inlet Side of Blower (Top Shaft)

Motor On Inlet Side of Blower (Bottom Shaft)

Motor On Discharge Side of Blower (Top Shaft)

Motor On Discharge Side of Blower (Bottom Shaft)

INLETDISCHARGE

Top Shaft

INLETDISCHARGE

Bottom Shaft

INLETDISCHARGE

Top Shaft

INLETDISCHARGE

Bottom Shaft

Acceptable Blower Drive Arrangement Options

ACCEPTABLE UNACCEPTABLE

14

Above are suggested locations for available accessories.

Figure 3a - Air Blower Installation with Accessories

Figure 3b -Gas Blower Installation with Accessories

Above are suggested locations for available accessories.


Blower Orientation Conversion

Model Reversible Whispair™Rotation Design

Universal RAI yes no

URAI-J Whispair™ no yes

URAI-G yes no

Blower Orientation and Lubrication Points: Grease Lubricated Drive EndUniversal RAI series & URAI-G gas blowers

Special Note: WHISPAIR™ models are designed to operatewith only one shaft rotation direction to take full advantage ofthe Whispair feature. Therefore, a WHISPAIR™ blower may beoperated in the following combinations.

• CCW Rotation: Bottom Shaft; Right side discharge or aLeft Shaft; Bottom discharge

• CCW Rotation: Top Shaft; Left side discharge or a RightShaft; Top discharge

• CW Rotation: Bottom Shaft; Left side discharge or aRight Shaft Bottom discharge

• CW Rotation: Top Shaft; Right side discharge or a LeftShaft Top discharge

Figure 4

or

16

Table 1 - Universal RAI series, Universal URAI-DSl & URAI-G gas blower,Maximum Allowable Operating Conditions

22 2.5 5275 225 (125) 12 (827) 15 (500)24 2.5 5275 210 (117) 7 (483) 15 (500)32 3.5 3600 240 (133) 15 1034 16 (539)33 3.5 3600 225 (125) 12 (827) 15 (500)36 3.5 3600 225 (125) 7 (483) 15 (500)42 4.0 3600 240 (133) 15 (1034) 16 (539)45 4.0 3600 225 (125) 10 (690) 16 (539)47 4.0 3600 225 (125) 7 (483) 15 (500)53 5.0 2850 225 (125) 15 (1034) 16 (539)56 5.0 2850 225 (125) 13 (896) 16 (539)59 5.0 2850 225 (125) 7 (483) 15 (500)65 6.0 2350 250 (130) 15 (1034) 16 (539)68 6.0 2350 240 (133) 14 (965) 16 (539)

615 6.0 2350 130 ( 72) 7 (483) 14 (472)76 7.0 2050 250 (139) 15 (1034) 16 (539)

711 7.0 2050 225 (125) 10 (690) 16 (539)718 7.0 2050 130 ( 72) 6 (414) 12 (405)

Frame Gear Speed Temp. Rise Delta Pressure Inlet VacuumSize Diameter (Inch) RPM F° (C°) PSI (mbar) INHG (mbar)

Drive End Breather Orientation for U-RAI series - DSL with Oil Lube


Frame Size Drive End Capacity Fl. Oz. (Liters)Vertical Horizontal

32 4.0 (.12) 6.5 (.19)33 4.0 (.12) 6.5 (.19)36 4.0 (.12) 6.5 (.19)42 5.5 (.16) 10.8 (.32)45 5.5 (.16) 10.8 (.32)47 5.5 (.16) 10.8 (.32)53 7.5 (.22) 14.8 (.44)56 7.5 (.22) 14.8 (.44))59 7.5 (.22) 14.8 (.44)65 16 (0.47) 31 (0.91)68 16 (0.47) 31 (0.91)

615 16 (0.47) 31 (0.91)

Ambient ISOTemperature °F (°C) Viscosity No.

Above 90° (32°) 32032° to 90° (0° to 32°) 2200° to 32° (-18° to 0°) 150

Below 0° (-18°) 100

UNIVERSAL RAI, URAI-J, URAI-G

Frame Size Gear End Capacity Fl. Oz. (Liters)Vertical Horizontal

22 3.4 (.1) 6.1 (.18)24 3.4 (.1) 6.1 (.18)32 8.5 (.25) 10.5 (.31)33 8.5 (.25) 10.5 (.31)36 8.5 (.25) 10.5 (.31)42 12.7 (.37) 14.5 (.43)45 12.7 (.37) 14.5 (.43)47 12.7 (.37) 14.5 (.43)53 16.0 (.47) 27.6 (.82)56 16.0 (.47) 27.6 (.82)59 16.0 (.47) 27.6 (.82)65 28.3 (.84) 52.1 (1.54)68 28.3 (.84) 52.1 (1.54)

615 28.3 (.84) 52.1 (1.54)76 32.3 (.96) 59.5 (1.76)

711 32.3 (.96) 59.5 (1.76)718 32.3 (.96) 59.5 (1.76)

Table 4 - Universal URAI series with Grease Lubricated Drive End: Specified BearingGreasing Intervals

Speed In RPM Operating Hours Per Day8 16 24

Greasing Intervals in Weeks

750-1000 7 4 21000-1500 5 2 11500-2000 4 2 12000-2500 3 1 12500-3000 2 1 1

3000 and up 1 1 1

Table 2 - Recommended Oil Grades

UNIVERSAL URAI series-DSL Splash Lubricated Drive End

URAI GAS Blower Oil and Grease Specifications

The specified oil should be ROOTS synthetic P/N 813-106- ofthe proper viscosity.

Table 3 - Approximate Oil Sump Capacities

The specified grease for servicing driveend bearings of a Gas blower, use a NLGI#2 premium grade aluminum complex*grease, ROOTS P/N T20019001 with300°F (149°C) service temperature andmoisture resistance and good mechanicalstability.

When servicing drive end bearings of NonGas blower, use a NLGI #2 premiumgrade microgel grease with 250°F (121°C)service temperature and moisture resist-ance and good mechanical stability.ROOTS specifies Shell Darina EP NLGIGrade 2. Product Code 71522.

NOTE: Lithium based greases are notcompatible with the ROOTS Syntheticgrease used when assembling a Gasblower or the non-soap base grease usedwhen assembling a standard URAI blower.Lithium based grease is not approved forany ROOTS blowers.

See page 14 and 15 for illustration of vertical and horizontal configurations.

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.

Note that the gear end sump capacity is provided on the adjacent table.

18

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1 Headplate Gear End 12 Headplate Drive End 13 Gearbox 14 Timing Gears 25 Cover-Blind (Plug Opening) 17 Gasket, Gear Box 1

11 Cylinder 112 Impeller & Shaft Drive 113 Impeller & Shaft Driven 114 Bearing, Ball 315 Bearing, Roller 116 Pin, Dowel 417 Gear Nut 219 Key 121 Plug, Pipe 323 Screw Hex Nylock 825 Breather (Plug Vent) 126 Screw, Hex *27 Seal, Lip Bearing 429 Washer, Spring Wavy 231 Screw, Hex, Nylock 432 Screw, Hex 1033 Seal Lip-Drive 134 Clamp Plate 235 Foot 237 Fitting, Grease 238 Fitting, Relief 239 Washer Mounting 4

1 Headplate Gear End 12 Headplate Drive End 13 Gearbox 14 Timing Gears 27 Gasket, Gear Box, DE Cover 1

11 Cylinder 112 Impeller & Shaft Drive 113 Impeller & Shaft Driven 114 Bearing, Ball 315 Bearing, Roller 116 Pin, Dowel 417 Gear Nut 219 Key 121 Plug, Pipe 323 Screw Hex 625 Breather (Plug Vent) 126 Screw, Hex *27 Seal, Lip Bearing 431 Screw, Hex, Nylock 432 Screw, Hex 633 Seal Lip-Drive 134 Clamp Plate 235 Foot 239 Washer Mounting 440 Screw Socket 242 Screw Hex 248 DE Oil Slinger Set Screw 450 Drive End Cover 152 Drive End Oil Slinger 253 Oil Sight Glass 2

Universal RAI Series Blowers Parts List6” & 7” Gear Diameter(Refer to drawing #64792023)

Item # Part Name Qty.

*Quantities vary by blower.

Universal RAI Series Blowers Parts List2-1/2” – 5” Gear Diameter

(Refer to drawing #64720023)


11 Cylinder 112 Impeller & Shaft Drive 113 Impeller & Shaft Driven 114 Bearing, Ball 315 Bearing, Roller 116 Pin, Dowel 417 Gear Nut 219 Key 121 Plug, Pipe 323 Screw Hex 625 Breather (Plug Vent) 126 Screw, Hex *27 Seal, Lip Bearing 431 Screw, Hex, Nylock 432 Screw, Hex 633 Seal Lip-Drive 134 Clamp Plate 235 Foot 237 Fitting, Grease 238 Fitting, Relief 239 Washer Mounting 440 Screw Socket 242 Screw Hex 2



Universal RAI-DSL Series Blowers Parts List3-1/2” – 5” Gear Diameter(Refer to drawing #T30356023)



Universal RAI®-DSL Series Blowers Parts List 6” Gear Diameter(Refer to drawing #T30382023)

1 Headplate Gear End 12 Headplate Drive End 13 Gearbox 14 Timing Gears 27 Gasket, Gear Box 1

11 Cylinder 112 Impeller & Shaft Drive 113 Impeller & Shaft Driven 114 Bearing, Ball 315 Bearing, Roller 116 Pin, Dowel 417 Gear Nut 219 Key 121 Plug, Pipe 3



23 Screw Hex Nylock 825 Breather (Plug Vent) 126 Screw, Hex *27 Seal, Lip Bearing 431 Screw, Hex, Nylock 432 Screw, Hex 1033 Seal Lip-Drive 134 Clamp Plate 235 Foot 239 Washer Mounting 448 DE Oil Slinger Set Screw 450 Drive End Cover 152 Drive End Oil Slinger 253 Oil Sight Glass 2




7* Gasket DE Cover 111 Cylinder 112 Impeller & Shaft Drive 113 Impeller & Shaft Driven 114 Bearing, Ball 315 Bearing, Roller 116 Pin, Dowel 417 Gear Nut 219 Key 121 Plug, Pipe 323 Screw Hex Nylock 825 Breather (Plug Vent) 126 Screw, Hex 14**27 Seal, Bearing 431 Screw, Hex 432 Screw, Hex 1033 Seal Lip-Drive 134 Clamp Plate 235 Foot 237 Fitting, Grease 238 Fitting, Relief 239 Washer Mounting 440 Screw Socket 242 Screw Hex 243 Plug 851 Shoulder Bolt 253 Oil Sight Glass 2

Universal RAI Series Gas Blowers Parts List6” Gear Diameter

(Refer to drawing #T3011023)


*DE cover gasket is not the same as the gasket used on theGE. You must specify the gasket required when ordering.**Quantities vary by blower.

Universal RAI Series Gas Blowers Parts List3-1/2” & 5” Gear Diameter(Refer to drawing #T30099023)


11 Cylinder 112 Impeller & Shaft Drive 113 Impeller & Shaft Driven 114 Bearing, Ball 315 Bearing, Roller 116 Pin, Dowel 417 Gear Nut 219 Key 121 Plug, Pipe 323 Screw Hex 825 Breather (Plug Vent) 126 Screw, Hex 14*27 Seal, Bearing 431 Screw, Hex 432 Screw, Hex 433 Seal Lip-Drive 134 Clamp Plate 235 Foot 237 Fitting, Grease 238 Fitting, Relief 239 Washer Mounting 440 Screw Socket 242 Screw Hex 2



Specified Lubricants

ROOTS Synthetic Oil: ISO-VG-220 Grade

Part Number

Quart 813-106-001

Gallon 813-106-002

Case (12 qts) 813-106-008

ROOTS Synthetic Oil: ISO-VG-320 Grade

Part Number

Quart 813-106-004

Gallon 813-106-005

Case (12 qts) 813-106-007

ROOTS Synthetic Grease: NLGI #2

Part Number

14.5 oz. Tube T200019-001

5 Gallon Pail T200019-003

Case (30 tubes) T200019-002

URAI-DSL AIR BLOWERS (with Dual Splash Lubrication)

26

Basic Connection & Drive Shaft Information

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHT6510202065103020

2224

1˝ NPT2˝NPT

0.625˝0.625˝

3243

710480206510502065106020

323336

1.25˝ NPT2˝ NPT

2.5˝ NPT

0.750˝0.750˝0.750˝

6974

102

651080206510902065110020

424547

1.5˝ NPT2.5˝ NPT3˝ NPT

0.875˝0.875˝0.875˝

88109128

651120206511302065114020

535659

2.5˝ NPT4˝ NPT4˝ NPT

1.125˝1.125˝1.125˝

143170204

651160206511702065118020

6568615

3˝ NPT5˝ NPT

6˝ Flange

1.375˝1.375˝1.375˝

245285425

651200206512102065122020

76711718

4˝ NPT6˝ Flange8˝ Flange

1.562˝1.562˝1.562˝

400530650

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHTT30378020T30379020T30380020

323336

1.25˝ NPT2˝NPT

2.5˝ NPT

0.750˝0.750˝0.750˝

7277

105

T30352020T30353020T30354020

424547


0.875˝0.875˝0.875˝

92113132

T30359020T30360020T30361020

535659


1.125˝1.125˝1.125˝

148175209

T30384020T30385020T30386020

6568615

3˝ NPT5˝ NPT

6˝ Flange

1.375˝1.375˝1.375˝

250290430

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHT710480G0651050G0651060G0

323336

1.25˝ NPT2˝NPT

2.5˝ NPT

0.750˝0.750˝0.750˝

6974

102

651080G0651090G0651100G0

424547


0.875˝0.875˝0.875˝

88109128

651120G0651130G0651140G0

535659


1.125˝1.125˝1.125˝

143170204

651160G0651170G0651180G0

6568615

3˝ NPT5˝ NPT6˝ NPT

1.375˝1.375˝1.375˝

245285425

UNIVERSAL RAI (URAI) AIR BLOWERSURAI AIR BLOWERS (with Grease Lubricated Drive End)

UNIVERSAL RAI (URAI) GAS BLOWERSURAI-G™ GAS BLOWERS (with Grease Lubricated Drive End)

Refer to Specification Sheet S-12K84

Refer to Specification Sheet S-27S03Universal RAI air blowers include detachable mounting feet which permit vertical or horizontal installation. The units are centertimed for rotation in either direction. The bearings on the URAI are grease lubricated on the drive end and splash lubricated onthe gear end. The URAI-DSL is splash lubricated on BOTH ends.

Refer to Specification Sheet S-60A01Universal RAI-G™ gas blowers include detachable mounting feet which permit vertical or horizontal installation. Feet are differentfor vertical and horizontal mounting. The bearings on the URAI are grease lubricated on the drive end and splash lubricated onthe gear end. ROOTS Synthetic lubricant is recommended.


BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHT7406502074086020

33J36J

2˝ NPT2.5˝ NPT

0.750˝0.750˝

84112

7406602074087020

45J47J

2.5˝ NPT3˝ NPT

0.875˝0.875˝

119138

74067020 56J 4˝ NPT 1.125˝ 180

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHTT30417020T30418020

33J36J

2˝ NPT2.5˝ NPT

0.750˝0.750˝

87115

T30410020T30412020

45J47J

2.5˝ NPT3˝ NPT

0.875˝0.875˝

122141

T30415020 56J 4˝ NPT 1.125˝ 185

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHTTBD

740860M033J36J

2˝ BSP2.5˝ BSP

19 mm19 mm

84112

TBDTBD

45J47J

2.5˝ BSP3˝ BSP

24 mm24 mm

119138

TBD 56J 4˝ BSP 28 mm 180

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHTTBD

T304660M033J36J

2˝ BSP2.5˝ BSP

19 mm19 mm

87115

TBDT304550M0

45J47J

2.5˝ BSP3˝ BSP

24 mm24 mm

122141

TBD 56J 4˝ BSP 28 mm 185


UNIVERSAL RAI (URAI-J®) WHISPAIR™ BLOWERS

URAI-J® WHISPAIR™ BLOWERS (with Grease Lubricated Drive End)

Refer to Specification Sheet S-33A93

Refer to Specification Sheet S-30S03

Universal RAI-J air blowers incorporate the patented Whispair™ design in addition to the same features as the original URAI blow-ers. The URAI-J’s are center timed, however the Whispair™ benefits can only be realized when the jet is located in the dischargeposition.

URAI-J DSL WHISPAIR BLOWERS (with Dual Splash Lubrication)

URAI-J DSL METRIC WHISPAIR AIR BLOWERS (with Dual Splash Lubrication)

URAI-J METRIC WHISPAIR BLOWERS (with Grease Lubed Drive End)

28

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHT651020M0651030M0

2224

1˝ BSP2˝ BSP

16 mm16 mm

3243

710480M0651050M0651060M0

323336

1.25˝ BSP2˝ BSP

2.5˝ BSP

19 mm19 mm19 mm

6974102

651080M0651090M0651100M0

424547

1.5˝ BSP2.5˝ BSP3˝ BSP

24 mm24 mm24 mm

88109128

651120M0651130M0651140M0

535659

2.5˝ BSP4˝ BSP4˝ BSP

28 mm28 mm28 mm

143170204

T30392060T30394060T30390060

6568615

3˝ BSP5˝ BSP

150 NP10

32 mm32 mm32 mm

245285425

T30396060T30398060T30400060

76711718

4˝ BSP150 NP10200 NP10

38 mm38 mm38 mm

400530650

BOM#*FRAME

SIZEINLET/DISCH

CONN.SHAFT

DIAMETERBARE

WEIGHTT30463060T30464060T30465060

323336

1.25˝ BSP2˝ BSP

2.5˝ BSP

19 mm19 mm19 mm

7277105

T30451060T30452060T30453060

424547

1.5˝ BSP2.5˝ BSP3˝ BSP

24 mm24 mm24 mm

92113132

T30459060T30460060T30461060

535659

2.5˝ BSP4˝ BSP4˝ BSP

28 mm28 mm28 mm

148175209

T30472060T30473060T30474060

6568615

3˝ BSP5˝ BSP

150 NP10

32 mm32 mm32 mm

250290430


UNIVERSAL RAI METRIC (URAI-M) AIR BLOWERS

URAI METRIC AIR BLOWERS (with Grease Lubed Drive End)

NOTE: METRIC URAI product has metric shaft diameter and connection sizes

URAI-DSL METRIC AIR BLOWERS (with Dual Splash Lubrication)

Universal RAI air blowers include detachable mounting feet which permit vertical or horizontal installation. The units are centertimed for rotation in either direction. The bearings on the URAI are grease lubricated on the drive end and splash lubricated on thegear end. The URAI-DSL is splash lubricated on BOTH ends.


After extensive life testing on rotary lobeblowers, Dresser ROOTS™ introduced aspecial blend, high-temperature,(polyalphaolefin based) synthetic lubricatingoil for ROOTS™ blowers in 1990.

Today's ROOTS™ blowers and exhausters aredesigned and built with the same attentionto detail that has firmly established theDresser Roots reputation for reliability,quality and technical excellence over the past150 years.

ROOTS™ synthetic lubricating oils are madewith the same quality and technicalexcellence standards to meet the highestspecifications required for maximumperformance.

LUBRICANT ADVANTAGES:• High Oxidation Stability - Contains oxidation-resistant additives that mean longer oil life and fewer oilchanges. ROOTS™ synthetic lubricating oil excels in ASTM oxidation tests, and in the field, where itcounts. Longer oil life means lower expenditures, and greater conservation.

• Rapid Separation from Water - Promotes prolonged bearing life.• Excellent Corrosion Protection - Contains synthetic corrosion inhibitors. Protects during operation andacts as a preservative during shut down.

• Synthetic Solvency - Keeps equipment clean.• Ashless - Keeps equipment free from metallic ash deposits.• Compatible with Seals - Has excellent compatibility with seals.• Blower Protection - Protects blower through a wide range of operating temperatures.• Pour Point - from -40°F (-40°C). Flash Point - at 500°F (260°C).• Range of Use - ROOTS™ synthetic lubricating oil can be used in any blower application or operating envi-ronment.

• High Film Strength - ROOTS™ synthetic lubricating oil carries up to 700% greater loads than other miner-al and synthetic oils.

• Low Friction - Extremely low coefficient of friction proven to save energy over conventional oils.• Compatibility With Other Oils - ROOTS™ synthetic lubricating oil is compatible with, and can be mixedwith, other mineral oils and most other synthetic oils No special cleaning is required at change out forblowers previously running on mineral oil. NOTE: It is NOT compatible with silicone or glycol synthetics.

• ISO Grade Availability - Available in ISO Grade 100, 150, 220, or 320.• Container Sizes - Available in one-quart containers, 12-quart cases, one-gallon containers, 5-gallon pails,or 55 gallon drums.

ROOTSTM

Blowers and CompressorsSynthetic Lubricating Oil

ISRB-2002 rev.0209

Dresser RootsHouston, Texas Headquarters • U.S. Toll Free Phone: 1-877-363-ROOT(S) (7668) • Direct Phone: +1 832-590-2600Connersville, Indiana Operations • U.S. Toll Free Phone: 1-877-442-7910 • Direct Phone: +1 765-827-9285United Kingdom Operations • Phone: +44 (0) 1695 52600USA/Canada Sales • Phone: +1 773-444-3360Houston, Texas Factory Service • Phone: +1 713-896-4810Mexico City Sales and Factory Service • Phone: +52 55 5889 5811Dubai Sales and Factory Service • Phone: +971 4 338 6254Malaysia Sales • Phone: +60 3 2267 2600China Sales • Phone: +86 10 8486 2440Shanghai Factory Service • Phone: +86 21 5858 7638

©2008 Dresser, Inc. all rights reserved. • Printed in the U.S.A. • All information subject to changewithout notice. • Universal RAI and EasyAir are registered trademarks of Dresser, Inc. • ROOTS,URAI-J, URAI-G, RAM X, and WHISPAIR, are trademarks of Dresser, Inc. www.dresser.com/rootsblowers

About Dresser, Inc.Dresser, Inc. is a leader in providing highly engi-neered infrastructure products for the global ener-gy industry. The company has leading positions ina broad portfolio of products including air and gashandling equipment, valves, actuators, meters,switches, regulators, piping products, natural gas-fueled engines, and retail fuel dispensers and asso-ciated retail point of sale systems. Leading brandnames within the Dresser portfolio include Dresser

ROOTS™ blowers, compressors and controls,Wayne® retail fueling systems, Waukesha® naturalgas-fired engines, Masoneilan® control valves,Mooney® regulators, Consolidated® pressure reliefvalves, and ROOTS® rotary gas meters. It hasmanufacturing and customer service facilitieslocated strategically worldwide and a sales pres-ence in more than 100 countries. The company’swebsite can be accessed at www.dresser.com

Documents

INSTALLATION,OPERATION&MAINTENANCE UniversalRAI ,URAI … · 2012. 6. 4. · 2 ROOTS ™ productsaresoldsubjecttothe currentGeneralTermsofSale,GTS-5001and WarrantyPolicyWP-5020.Copiesare