SOPLADORES URAI MANUAL.pdf

7/23/2019 SOPLADORES URAI MANUAL.pdf

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ROOTSROOTSOOTSBLOWERS EXHAUSTERS COMPRESSORS

INSTALLATION OPERATION MAINTENANCE

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

❏ In event of trouble during installation or operation,do not attempt repairs of ROOTS furnishedequipment. Notify ROOTS, giving all nameplateinformation plus an outline of operating conditionsand a description of the trouble. Unauthorizedattempts at equipment repair may void ROOTSwarranty.

❏ Units out of warranty may be repaired or adjustedby the owner. Good inspection and maintenancepractices should reduce the need for repairs.

NOTE: Information in this manual is correct as of thedate of publication. ROOTS reserves the right to makedesign or material changes without notice, and without

obligation to make similar changes on equipment ofprior manufacture.

For your nearest ROOTS Office, dial our CustomerService Hot Line toll free; 1 877 363 ROOT(S) (7668)or direct 281-966-4700.

DO THESE THINGS TO GET THE MOST FROM YOUR ROOTS™ BLOWER

CONTENTS

INFORMATION SUMMARY . . . . . . . . . . . 1

SAFETY PRECAUTIONS . . . . . . . . . . . . 2

OPERATING LIMITATIONS . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . 3

LUBRICATION . . . . . . . . . . . . . . . . . . . 7

OPERATION . . . . . . . . . . . . . . . . . . . . 8

OPERATING CHARACTERISTICS ..............9

❏ Check shipment for damage. If found, file claimwith carrier and notify ROOTS.

❏ Unpack shipment carefully, and check contentsagainst Packing List. Notify ROOTS if ashortage appears.

❏ Store in a clean, dry location until ready forinstallation. Lift by methods discussed underINSTALLATION to avoid straining or distorting theequipment. Keep covers on all openings. Protectagainst weather and corrosion if outdoor storageis necessary.

❏ Read OPERATING LIMITATIONS andINSTALLATION sections in this manual and planthe complete installation.

❏ Provide for adequate safeguards against accidentsto persons working on or near the equipment duringboth installation and operation. See SAFETY

PRECAUTIONS.

❏ Install all equipment correctly. Foundation designmust be adequate and piping carefully done. Userecommended accessories for operating protection.

❏Make sure both driving and driven equipment iscorrectly lubricated before start-up.See LUBRICATION.

TROUBLESHOOTING . . . . . . . . . . . . . . 10

INSPECTION & MAINTENANCE ..............11

FIGURES ...................................9,12-14

TABLES ........................................15-16

ASSEMBLY DRAWINGS ........17-20, 23-25

PARTS LIST ..................................21-22

US $3.00, Canada $4.50

IOM-180-205February 2005

UNIVERSAL RAI ® , URAI-DSL AND URAI-G SERIES



ROOTS™ products are sold subject

to the current General terms ofSale, 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).


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SAFETY PRECAUTIONS

It is important that all personnel observe safetyprecautions to minimize the chances of injury.Among many considerations, the following shouldbe particularly noted:

• Blower casing and associated piping or accessories

may become hot enough to cause major skin burnson contact.

• Internal and external rotating parts of the blowerand driving equipment can produce serious physicalinjuries. Do not reach into any opening in theblower while it is operating, or while subject toaccidental starting. Protect external moving partswith adequate guards.

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

• If blower is operated with piping disconnected,place a strong coarse screen over the inlet andavoid standing in the discharge air stream.CAUTION: Never cover the blower inlet withyour hand or other part of body.

• Stay clear of the blast from pressure relief valvesand the suction area of vacuum relief valves.

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

• Casing pressure must not exceed 25 PSI(1725 mbar) gauge. Do not pressurize ventedcavities from an external source, nor restrict thevents without first consulting ROOTS.

• Do not use air blowers on explosive orhazardous gases.

• Other potential hazards to safety may also beassociated with operation of this equipment. Allpersonnel working in or passing through the areashould be trained to exercise adequate generalsafety precautions.

OPERATING LIMITATIONS

A ROOTS™ blower or exhauster must be operatedwithin certain approved limiting conditions to enablecontinued satisfactory performance.Warranty iscontingent on such operation.

Maximum limits for pressure, temperature and speed

are specified in TABLE 1 for various models & sizesof blowers & exhausters.These limits apply to all unitsof normal construction, when operated understandard atmospheric conditions. Be sure to arrangeconnections or taps for thermometers and pressureor vacuum gauges at or near the inlet and dischargeconnections of the unit. These, along with a goodtachometer, will enable periodic checks ofoperating conditions.

PRESSURE – The pressure rise, between inlet anddischarge, must not exceed the figure listed for thespecific unit frame size concerned. Also, in any systemwhere the unit inlet is at a positive pressure above

atmosphere a maximum case rating of 25 PSI gauge(1725 mbar) should not be exceeded without firstconsulting the ROOTS. Never should the maximumallowable differential pressure be exceeded.

On vacuum service, with the discharge to atmosphericpressure, the inlet suction or vacuum must not begreater than values listed for the specific frame size.

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

• Measured temperature rise must not exceed listedvalues when the inlet is at ambient temperature.Ambient is considered as the general temperatureof the space around the unit. This is not outdoortemperature unless the unit is installed outdoors.

• If inlet temperature is higher than ambient, thelisted allowable temperature rise values must bereduced by 2/3 of the difference between theactual measured inlet temperature and theambient temperature.

• The average of the inlet and discharge temperaturemust not exceed 250°F. (121°C).

SPEED – These blowers & exhausters maybe operated at speeds up to the maximum listed forthe various frame sizes. They may be direct coupledto suitable constant speed drivers if pressure/tempera-ture conditions are also within limits. At low speeds,excessive temperature rise may be a limiting factor.

Special Note: The listed maximum allowable tempera-ture rise for any particular blower & exhauster mayoccur well before its maximum pressure or vacuumrating is reached. This may occur at high altitude, lowvacuum or at very low speed.The units’ operating limitis always determined by the maximum rating reachedfirst. It can be any one of the three: Pressure,Temperature or Speed.



ROOTS™ blowers & exhausters are treated after factoryassembly to protect against normal atmosphericcorrosion. The maximum period of internal protectionis considered to be one year under average conditions,if shipping plugs & seals are not removed. Protectionagainst chemical or salt water atmosphere is not

provided. Avoid opening the unit until ready to startinstallation, as corrosion protection will be quickly lostdue to evaporation.

If there is to be an extended period between installa-tion and start up, the following steps should be takento ensure corrosion protection.

❏ Coat internals of cylinder, gearbox and drive endbearing reservoir with Nox-Rust VCI-10 orequivalent. Repeat once a year or as conditionsmay require. Nox-Rust VCI-10 is petroleumsoluble and does not have to be removed beforelubricating. It may be obtained from DaubertChemical Co., 2000 Spring Rd., Oak Brook, Ill.

60521.

❏ Paint shaft extension, inlet and discharge flanges,and all other exposed surfaces with Nox-RustX-110 or equivalent.

❏ Seal inlet, discharge, and vent openings. It is notrecommended that the unit be set in place, pipedto the system, and allowed to remain idle forextended periods. If any part is left open to theatmosphere, the Nox-Rust VCI-10 vapor willescape and lose its effectiveness.

❏ Protect units from excessive vibrationduring storage.

❏ Rotate shaft three or four revolutions everytwo weeks.

❏ Prior to start up, remove flange covers on bothinlet and discharge and inspect internals to insureabsence of rust. Check all internal clearances.Also, at this time, remove gearbox and drive endbearing cover and inspect gear teeth and bearingsfor rust.

Because of the completely enclosed unit design,location of the installation is generally not a criticalmatter. A clean, dry and protected indoor location ispreferred. However, an outdoor location will normally

give satisfactory service. Important requirements arethat the correct grade of lubricating oil be provided forexpected operating temperatures, and that the unit belocated so that routine checking and servicing can beperformed conveniently. Proper care in locating driverand accessory equipment must also be considered.

Supervision of the installation by a ROOTS ServiceEngineer is not usually required for these units.Workmen with experience in installing light tomedium weight machinery should be able to produce

INSTALLATION

satisfactory results. Handling of the equipment needsto be accomplished with care, and in compliance withsafe practices. Unit mounting must be solid, withoutstrain or twist, and air piping must be clean, accuratelyaligned and properly connected.

Bare-shaft Units: Two methods are used to handlea unit without base. One is to use lifting lugs boltedinto the top of the unit headplates. Test them first fortightness and fractures by tapping with a hammer.In lifting, keep the direction of cable pull on thesebolts as nearly vertical as possible. If lifting lugs arenot available, lifting slings may be passed under thecylinder adjacent to the headplates. Either methodprevents strain on the extended drive shaft.

Packaged Units: When the unit is furnished mountedon a baseplate, with or without a driver, use of liftingslings passing under the base flanges is required.Arrange these slings so that no strains are placed onthe unit casing or mounting feet, or on any mounted

accessory equipment. DO NOT use the lifting lugs inthe top of the unit headplates.

Before starting the installation, remove plugs, coversor seals from unit inlet and discharge connectionsand inspect the interior completely for foreign material.If cleaning is required, finish by washing the cylinder,headplates and impeller thoroughly with a petroleumsolvent. Turn the drive shaft by hand to make surethat the impellers turn freely at all points. Anti-rustcompound on the connection flanges and driveshaft extension may also be removed at this timewith the same solvent. Cover the flanges until readyto connect piping.

MountingCare will pay dividends when arranging the unitmounting. This is especially true when the unit isa “bare-shaft” unit furnished without a baseplate.The convenient procedure may be to mount such aunit directly on a floor or small concrete pad, butthis generally produces the least satisfactory results.It definitely causes the most problems in leveling andalignment and may result in a “Soft Foot” condition.Correct soft foot before operation to avoid unnecessaryloading on the casing and bearings.Direct use of buildingstructural framing members is not recommended.

For blowers without a base, it is recommended that awell anchored and carefully leveled steel or cast ironmounting plate be provided. The plate should be atleast 1 inch (25 mm) thick, with its top surfacemachined flat, and large enough to provide levelingareas at one side and one end after the unit is mount-ed. It should have properly sized studs or tapped holeslocated to match the unit foot drilling. Proper use of ahigh quality machinist’s level is necessary for adequateinstallation.


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With the mounting plate in place and leveled, set theunit on it without bolting and check for rocking. If itis not solid, determine the total thickness of shimsrequired under one foot to stop rocking. Place half ofthis under each of the diagonally-opposite short feet,and tighten the mounting studs or screws. Rotate thedrive shaft to make sure the impellers turn freely. If theunit is to be direct coupled to a driving motor, consider

the height of the motor shaft and the necessity for it tobe aligned very accurately with the unit shaft. Best unitarrangement is directly bolted to the mounting platewhile the driver is on shims of at least 1/8 inch (3mm)thickness. This allows adjustment of motor position infinal shaft alignment by varying the shim thickness.

AligningWhen unit and driver are factory mounted on acommon baseplate, the assembly will have beenproperly aligned and is to be treated as a unit forleveling purposes. Satisfactory installation can beobtained by setting the baseplate on a concrete slabthat is rigid and free of vibration, and leveling the top

of the base carefully in two directions so that it is freeof twist.The slab must be provided with suitable anchorbolts. The use of grouting under and partly inside theleveled and shimmed base is recommended.

It is possible for a base-mounted assembly to becometwisted during shipment, thus disturbing the originalalignment. For this reason, make the following checksafter the base has been leveled and bolted down.Disconnect the drive and rotate the unit shaft by hand.It should turn freely at all points. Loosen the unit foothold-down screws and determine whether all feet areevenly in contact with the base. If not, insert shims asrequired and again check for free impeller rotation.Finally, if unit is direct coupled to the driver, checkshaft and coupling alignment carefully and make anynecessary corrections.

In planning the installation, and before setting the unit,consider how piping arrangements are dictated by theunit design and assembly. Drive shaft rotation must beestablished accordingly and is indicated by an arrownear the shaft.

Typical arrangement on vertical units has the driveshaft at the top with counterclockwise rotation anddischarge to the left. Horizontal units are typicallyarranged with the drive shaft at the left with counter-clockwise rotation and discharge down. See Figure 3

and 4 for other various unit arrangements andpossible conversions.

When a unit is DIRECT COUPLED to its driver, thedriver RPM must be selected or governed so as not toexceed the maximum speed rating of the unit. Refer toTable 1 for allowable speeds of various unit sizes.

A flexible type coupling should always be used toconnect the driver and unit shafts.

When direct coupling a motor or engine to a bloweryou must insure there is sufficient gap between the

coupling halves and the element to prevent thrustloading the blower bearings. When a motor, engine orblower is operated the shafts may expand axially. If thecoupling is installed in such a manner that there is notenough room for expansion the blower shaft can beforced back into the blower and cause the impeller tocontact the gear end headplate resulting in damage tothe blower. The two shafts must be in as near perfect

alignment in all directions as possible, and the gapmust be established with the motor armature on itselectrical center if end-play exists.

The following requirements of a good installation arerecommended. When selecting a coupling to be fittedto the blower shaft ROOTS recommends a taper lockstyle coupling to insure proper contact with the blowershaft. If the coupling must have a straight bore the cou-pling halves must be fitted to the two shafts with a lineto line thru .001” interference fit. Coupling halves mustbe warmed up per coupling manufacturer’s recommen-dations. Maximum deviation in offset alignment of theshafts should not exceed .005” (.13 mm) total indicatorreading, taken on the two coupling hubs. Maximum

deviation from parallel of the inside coupling facesshould not exceed .001” (.03 mm) when checked at sixpoints around the coupling.

When a unit is BELT DRIVEN, the proper selection ofsheave diameters will result in the required unit speed.When selecting a sheave to be fitted to the blowershaft ROOTS recommends a taper lock style sheave toinsure proper contact with the blower shaft. This flexi-bility can lead to operating temperature problemscaused by unit speed being too low. Make sure thedrive speed selected is within the allowable range forthe specific unit size, as specified under Table 1.

Belt drive arrangements usually employ two or moreV-belts running in grooved sheaves. Installation of thedriver is less critical than for direct coupling, but itsshaft must be level and parallel with the unit shaft.The driver should be mounted on the inlet side ofa vertical unit (horizontal piping) and on the sidenearest to the shaft on a horizontal unit. The drivermust also be mounted on an adjustable base to permitinstalling, adjusting and removing the V-belts. Toposition the driver correctly, both sheaves need to bemounted on their shafts and the nominal shaft centerdistance known for the belt lengths to be used.

CAUTION: Drive couplings and sheaves (pulleys)should have an interference fit to the shaft of the

blower (set screw types of attachment generally donot provide reliable service.) It is recommended thatthe drive coupling or sheave used have a taper lockstyle bushing which is properly sized to provide thecorrect interference fit required. Drive couplings, thatrequire heating to fit on the blower shaft, should beinstalled per coupling manufacturer recommendations.A drive coupling or sheave should not be forced on tothe shaft of the blower as this could affect internal



clearances resulting in damage to the blower. Enginedrive applications often require special considerationto drive coupling selection to avoid harmful torsionalvibrations. These vibrations may lead to blowerdamage if not dampened adequately. It is oftennecessary to install a fly-wheel and/or a torsionallysoft elastic element coupling based on the Enginemanufacturer recommendations.

The driver sheave should also be mounted as close toits bearing as possible, and again should fit the shaftcorrectly. Position the driver on its adjustable base sothat 2/3 of the total movement is available in thedirection away from the unit, and mount the assemblyso that the face of the sheave is accurately in line withthe unit sheave.This position minimizes belt wear, andallows sufficient adjustment for both installing andtightening the belts. After belts are installed, adjusttheir tension in accordance with the manufacturer’sinstructions. However, only enough tension should beapplied to prevent slippage when the unit is operatingunder load. Excessive tightening can lead to earlybearing failures or shaft breakage.

Before operating the drive under power to check initialbelt tension, first remove covers from the unitconnections. Make sure the interior is still clean, thenrotate the shaft by hand. Place a coarse screen overthe inlet connection to prevent anything being drawninto the unit while it is operating, and avoid standingin line with the discharge opening. Put oil in the sumpsper instructions under LUBRICATION.

PipingBefore connecting piping, remove any remaininganti-rust compound from Unit connections. Clean pipeshould be no smaller than unit connections. In addition,

make sure it is free of scale, cuttings, weld beads, orforeign material of any kind. To further guard againstdamage to the unit, especially when an inlet filter is notused, install a substantial screen of 16 mesh backedwith hardware cloth at or near the inlet connections.Make provisions to clean this screen of collecteddebris after a few hours of operation. It should beremoved when its usefulness has ended, as the wirewill eventually deteriorate and small pieces going intothe unit may cause serious damage.

Pipe flanges or male threads must meet the unitconnections accurately and squarely. DO NOT attemptto correct misalignment by springing or cramping the

pipe. In most cases this will distort the unit casing andcause impeller rubbing. In severe cases it can preventoperation or result in a broken drive shaft. For similarreasons, piping should be supported near the unit toeliminate dead weight strains. Also, if pipe expansion is

likely to occur from temperature change, installation offlexible connectors or expansion joints is advisable.

Figure 3 represents an installation with all accessoryitems that might be required under various operatingconditions. Inlet piping should be completely free ofvalves or other restrictions.When a shut-off valve cannot be avoided, make sure a full size vacuum relief isinstalled nearest the unit inlet. This will protect against

unit overload caused by accidental closing of theshut-off valve.

Need for an inlet silencer will depend on unit speed andpressure, as well as sound-level requirements in thegeneral surroundings. An inlet filter is recommended,especially in dusty or sandy locations. A dischargesilencer is also normally suggested, even thoughWhispair units operate at generally lower noise levelsthan conventional rotary blowers. Specific recommen-dations on silencing can be obtained from ROOTS.

Discharge piping requires a pressure relief valve, andshould include a manual unloading valve to permitstarting the unit under no-load conditions. Reliablepressure/vacuum gauges and good thermometers atboth inlet and discharge are recommended to allowmaking the important checks on unit operating condi-tions. The back-pressure regulator shown in Figure 3is useful mainly when volume demands vary while theunit operates at constant output. If demand is constant,but somewhat lower than the unit output, excess maybe blown off through the manual unloading valve.

In multiple unit installations where two or more unitsoperate with a common header, use of check valvesis mandatory.These should be of a direct acting or freeswinging type, with one valve located in each linebetween the unit and header. Properly installed, they

will protect against damage from reverse rotationcaused by air and material back-flow through anidle unit.

After piping is completed, and before applying power,rotate the drive shaft by hand again. If it does not movewith uniform freedom, look for uneven mounting, pipingstrain, excessive belt tension or coupling misalignment.

DO NOT operate the unit at this time unless it hasbeen lubricated per instructions.



TECHNICAL SUPPLEMENT

for 32, 33, 36, 42, 45, 47, 53, 56, 59, 65, 68, 615

UNIVERSAL RAI ® -G BLOWERS

ROOTS™ Universal RAI™-G rotary positive gas blowersare a design extension of the basic Universal RAI™

blower model. URAI™-G blower uses (4) mechanicalseals in place of the standard in board lip seals tominimize gas leakage into the atmosphere.The seal

vent chambers are plugged. These units are intendedfor gases which are compatible with cast iron casematerial, steel shafts, 300/400 series stainless steeland carbon seal components, viton o-rings and theoil/grease lubricants. If there are any questionsregarding application or operation of this gas blower,please contact factory.

Precaution: URAI ™ -G blowers: Care must be used when opening the head plate seal vent chamber plugs ( 43) as some gas will escape–if it is a pressure system, or the atmospheric air will leak in-if the system is under vacuum. There is a possibility of some gas leakage through the mechanical seals.

This leakage on the gear end will escape through the gear box vent, and on the drive end, through the grease release fittings. If the gas leakage is undesirable, each seal chamber must be purged with an inert gas through one purge gas hole (43 ) per seal .There are two plugged purge gas holes(1/8 NPT) provided per seal.The purge gas pressure must be maintained one psi above the discharge gas pressure. Also, there exists a possibility of gear end oil and drive end grease leakage into the gas stream.

The lubricants selected must be compatible withthe gas.



For Units with a Grease Lubricated Drive End

A simple but very effective lubrication system isemployed on the drive shaft end bearings. Hydraulicpressure relief fittings are provided to vent any excessgrease, preventing pressure build-up on the seals.

A restriction plug and metering orifice prevent loss oflubricant from initial surges in lubricant pressure butpermit venting excess lubricant under steadily risingpressures.

When servicing drive end bearings of a Gas blower, use a NLGI#2 premium grade aluminum complex* grease with 300°F(149°C) service temperature and moisture resistance and goodmechanical stability.

When servicing drive end bearings of Non Gas blower, use aNLGI #2 premium grade microgel grease with 250°F (121°C)service temperature and moisture resistance and good mechani-cal stability. ROOTS recommends Shell Darina EP NLGI Grade 2.Product Code 71522.

NOTE: Lithium based greases are not compatiblewith the ROOTS Synthetic grease used whenassembling a Gas blower or the non-soap basegrease used when assembling a standard URAIblower. Lithium based grease is not approved forany ROOTS blowers.

Using a pressure gun, slowly force new lubricant intoeach drive end bearing housing until traces of cleangrease comes out of the relief fitting. The use of anelectric or pneumatic grease gun could force the greasein too rapidly and thus invert the seals and should notbe used.

After a long shutdown, it is recommended that the

grease fittings be removed, the old grease flushed outwith kerosene or #10 lubricating oil, drained thoroughly,and bearings refilled with new grease. Be sure greaserelief fittings are reinstalled. Grease should be addedusing a hand operated grease gun to the drive endbearings at varying time intervals depending on dutycycle and RPM. Table 4 has been prepared as ageneral greasing schedule guide based on averageoperating conditions. More frequent intervals may benecessary depending on the grease operatingtemperature and unusual circumstances.

For Units with Splash Lubrication on Both Ends

Bearings and oil seals are lubricated by the action of

the timing gears or oil slingers which dip into the mainoil sumps causing oil to splash directly on gears andinto bearings and seals. A drain port is provided beloweach bearing to prevent an excessive amount of oil inthe bearings. Seals located inboard of the bearings ineach headplate effectively retain oil within the sumps.Any small leakage that may occur should the sealswear passes into a cavity in each vented headplate andis drained downward.

Oil sumps on each end of the blower are filled byremoving top vent plugs, Item (21), and filling until

LUBRICATION

oil reaches the middle of the oil level sight gauge,Item (37), or the overflow plug.

Initial filling of the sumps should be accomplished withthe blower not operating, in order to obtain the correctoil level. Approximate oil quantities required for blowers

of the various models and configurations are listed inTable 3. Use a good grade of industrial type non-detergent, rust inhibiting, anti-foaming oil and of correctviscosity per Table 2. *ROOTS™ synthetic oil (ROOTSP/N 813-106-) is highly recommended. ROOTS™ doesNOT recommend automotive type lubricants, as theyare not formulated with the properties mentioned above.

The oil level should not fall below the middle of the sitegauge or overflow plug on URAI (ref. pg.14) when theblower is idle. It may rise or fall on the gauge duringoperation, to an extent depending somewhat on oiltemperature and blower speed.

Proper lubrication is usually the most important single

consideration in obtaining maximum service life andsatisfactory operation from the unit. Unless operatingconditions are quite severe, a weekly check of oil leveland necessary addition of lubricant should be suffi-cient. During the first week of operation, check the oillevels in the oil sumps about once a day, and watchfor leaks. Replenish as necessary.Thereafter, anoccasional check should be sufficient. It is recommendedthat the oil be changed after initial 100 hours of opera-tion. Frequent oil changing is not necessary unlessthe blower is operated in a very dusty location.

Normal life expectancy of petroleum based oils is about2000 hours with an oil temperature of about 180°F

(82°C). As the oil temperature increases by incrementsof 15-18°F (8°C - 10°C), the life is reduced by half.Example: Oil temperatures of 210-216°F (99°C - 102°C)will produce life expectancy of 1/4 or 500 hours.Therefore, it is considered normal to have oil changeperiods of 500 hours with petroleum based oils.

Normal life expectancy of ROOTS™ Synthetic Oil isabout 4000 to 8000 hours with an oil temperature ofabout 180°F (82°C). As the oil temperature increasesby increments of 15-18°F (8°C - 10°C), the life isreduced by half. Example: Oil temperatures of 210-216°F (99°C - 102°C) will produce life expectancy of1/4 or 1000 to 2000 hours.

NOTE:To estimate oil temperature, multiply the dis-charge temperature of the blower by 0.80. Example: ifthe discharge air temperature of the blower is 200° F,it is estimated that the oil temperature is 160° F.

*ROOTS™ Synthetic Oil & Grease is superior in performance to

petroleum based products. It has high oxidation stability, excellentcorrosion protection, extremely high film strength and low coefficient

of friction. Typical oil change intervals are increased 2-3 times over

petroleum based lubricants. Also, ROOTS™ Synthetic Oil is 100%

compatible with petroleum based oils. Simply drain the oil in theblower and refill the reservoirs with ROOTS™ Synthetic Oil to maintain

optimum performance of your ROOTS™ blower.



Before operating a blower under power for the firsttime, recheck the unit and the installation thoroughlyto reduce the likelihood of avoidable troubles. Use thefollowing procedure check list as a guide, but considerany other special conditions in the installation.

❏ Be certain that no bolts, tools, rags, or debris havebeen left in the blower air chamber or piping.

❏ If an outdoor intake without filter is used, be surethe opening is located so it cannot pick up dirt andis protected by a strong screen or grille. Use of thetemporary protective screen as described underINSTALLATION is strongly recommended.

❏ Recheck blower leveling, drive alignment andtightness of all mounting bolts if installation is notrecent. If belt drive is used, adjust belt tensioncorrectly.

❏ Turn drive shaft by hand to make sure impellersstill rotate 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,be sure that power is available and that electricaloverload devices are installed and workable.

❏Open the manual unloading valve in the dischargeair line. If a valve is in the inlet piping, be sure it is open.

❏ Bump blower a few revolutions with driver to checkthat direction of rotation agrees with arrow nearblower shaft, and that both coast freely to a stop.

After the preceding points are cleared, blower isready for trial operation under “no-load” conditions.

The following procedure is suggested to cover thisinitial operation test period.

a. Start blower, let it accelerate to full speed, thenshut off. Listen for knocking sounds, both withpower on and as speed slows down.

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

c. After blower comes to a complete stop, operateblower for about 10 minutes unloaded. Check oillevels. Observe cylinder and headplate surfacesfor development of hot spots such as burned paint,

indicating impeller rubs. Be aware of any notice-able increase in vibration.

Assuming that all trials have been satisfactory, or thatnecessary corrections have been made, the blowershould now have a final check run of at least one hourunder normal operating conditions. After blower isrestarted, gradually close the discharge unloadingvalve to apply working pressure. At this point it isrecommended that a good pressure gauge ormanometer be connected into the discharge line ifnot already provided, and that thermometers be inboth inlet and discharge lines. Readings from these

instruments will show whether pressure or temperatureratings of the blower are being exceeded.

During the final run, check operating conditionsfrequently and observe the oil levels at reasonableintervals. If excessive noise or local heating develops,shut down immediately and determine the cause. Ifeither pressure rise or temperature rise across theblower exceeds the limit specified in this manual, shutdown and investigate conditions in the piping system.Refer to the TROUBLESHOOTING CHECKLIST forsuggestions on various problems that may appear.

The blower should now be ready for continuous dutyoperation at full load. During the first few days makeperiodic checks to determine whether all conditionsremain steady, or at least acceptable.This may beparticularly important if the blower is supplying air to aprocess system where conditions can vary. At the firstopportunity, stop the blower and clean the temporaryinlet protective screen. If no appreciable amount of

debris has collected, the screen may be removed.See comments under INSTALLATION. At this sametime, verify leveling, coupling alignment or belt tension,and mounting bolt tightness.

Should operating experience prove that blower capacityis a little too high for the actual air requirements, asmall excess may be blown off continuously throughthe manual unloading or vent valve. Never rely on thepressure relief valve as an automatic vent. Such usemay cause the discharge pressure to becomeexcessive, and can also result in failure of the valveitself. If blower capacity appears to be too low, refer tothe TROUBLESHOOTING CHECKLIST.

Vibration Assessment CriteriaWith measurements taken at the bearing locationson the housings, see chart below for an appropriateassessment guide for rotary lobe blowers rigidlymounted on stiff foundations.

In general, blower vibration levels should be monitoredon a regular basis and the vibration trend observed forprogressive or sudden change in level. If such achange occurs, the cause should be determinedthrough spectral analysis.

As shown on the chart below, the level of all passvibration will determine the need to measure discrete

frequency vibration levels and the action required.

OPERATION

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

0.45 or less N/R Approved

Greater than 0.45 0.45 or less @ Approvedbut 1.0 or less any frequency

Greater than 0.45 @ Investigateany frequency

Greater than 1.0 Less than 1.0 Investigate

Greater than 1.0 Investigate



OPERATING CHARACTERISTICS

ROOTS™ rotary blowers and exhausters, as covered inthis manual, are available in basic frame sizes rangingfrom 2 inch to 7 inch gear diameter.Various models,within this gear diameter range, are available with dif-ferent case lengths to produce reasonable steps in flowcapacity. The shorter case lengths have lower

volumetric capacities, but are capable of operatingagainst higher pressures. All models are available forair service and there are specifically designed modelsfor gas service.

The basic ROOTS™ rotary lobe blower is a positivedisplacement type unit. Flow capacity is determined byframe size, operating speed and pressure conditions.It employs two impellers mounted on parallel shaftsrotating in opposite directions within a cylinder closedat the ends by head-plates. As the impellers rotate,gas is drawn into one side of the cylinder and forcedout the opposite side.The pressure or vacuumdeveloped depends on the resistance of the piping

and process system.The unit is a precision engineered product with veryfine clearances between the rotating impellers andstationary case. Since there is no actual contactbetween these surfaces, internal lubrication is notrequired. Clearances are maintained by a pair ofaccurately machined timing gears, mounted on thetwo shafts extended outside the blower casing.

Operation of the familiar basic rotary lobe blower isillustrated in FIGURE 1, where air flow is left to rightfrom inlet to discharge with the top impeller rotatingclockwise. In Position 1 it is delivering a known volume(B) to the discharge, while space (A) between the

lower impeller and cylinder wall is being filled.Counterclockwise rotation of this impeller then trapsequal volume (A) in Position 2, and further rotationdelivers it to the discharge in Position 3.

One complete revolution of the driving shaft alternatelytraps four fixed and equal volumes of air (two by eachimpeller) and pushes them through to the discharge.The volume capacity of a lobe blower operating at aconstant speed therefore remains relatively independ-ent of reasonable inlet of discharge pressure variations.

To change capacity, it is necessary either to changespeed of rotation or blow off some of the discharge air.

No attempt should ever be made to control capacityby means of a throttle valve in the intake or dischargepiping. This will not only increase the power load on thedriver, but can also overload and seriously damage theblower. If a possibility does exist that flow to the blowerinlet may be cut off during normal operation of aprocess, then an adequate vacuum relief valve mustbe installed near the blower. A pressure type reliefvalve in the discharge line near the blower is requiredfor protection against cut-off or blocking in this line.Refer to FIGURE 3 for a complete piping schematic.

When a belt drive is installed, blower speed can usuallybe adjusted to obtain desired capacity by changing thediameter of one or both sheaves. In a direct coupledarrangement a variable speed motor or transmissionis required, or excess air may be blown off througha manually controlled unloading valve and silencer.If returned to the blower inlet, the air must be cooledto 100°F (38°C) through a by-pass arrangement tomaintain acceptable blower temperatures.

Before making any change in blower capacity, oroperating conditions, contact ROOTS for specificinformation applying to your particular blower. In allcases, operating conditions must be maintained within

the approved range of pressures, temperatures andspeeds as stated under LIMITATIONS. The air blowermust not be used to handle liquids or solids as seriousdamage to the rotating parts may result.

FIGURE 1 – FLOW THROUGH A BASIC ROTARY LOBE BLOWER

A

B

A

B

A

B



TROUBLESHOOTING

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

tension

5 Excessive pressure rise Check inlet vacuum and discharge pressure and comparewith Published performance

6 Obstruction in piping See item 3

7 Excessive slip Check inside of casing for worn or eroded surfaces causingexcessive clearances

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

9 Excessive pressure rise See Item 5

10 Impeller rubbing Inspect outside of cylinder for high temperature areas, thencheck 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 and grease sump levels in gear and drive endor gears headplates

13 Excessive lubrication Check oil levels. If correct, drain and refill with clean oil ofrecommended grade

14 Excessive pressure rise See Item 5

15 Coupling misalignment Check carefully. Realign if questionable

16 Excessive belt tension Readjust for correct tension

Vibration 17 Misalignment See Item 15

18 Impellers rubbing See Item 10

19 Worn bearings/gears Check gear backlash and condition of bearings, and replace

as indicated

20 Unbalanced or rubbing Scale or process material may build up on casing andimpeller impellers, or inside impellers. Remove build-up to restore

original clearances and impeller balance

21 Driver or blower loose Tighten mounting bolts securely

22 Piping resonances Determine whether standing wave pressure pulsations arepresent in the piping

23 Scale/sludge build-ups Clean out interior of impeller lobes to restore dynamicbalance

24 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-up

Excessive breather 27 Broken seal/worn seals Replace seals

Blow-by or excessive 28 Defective O-ring Replace seals and O-ringoil leakage to vent area

Excessive 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/Grease type or Check oil to insure it meets recommendations. Drain thenviscosity incorrect fill with clean oil of recommended grade.

32 Blower running hot Recommended oil temperature can be found on page 6 ofthis manual. The blower must be operated within theconditions of this manual



INSPECTION & MAINTENANCE: UNIVERSAL RAI ® SERIES BLOWERS

A good program of consistent inspection and mainte-nance is the most reliable method of minimizing repairsto a blower. A simple record of services and dates willhelp keep this work on a regular schedule. Basicservice needs are:

• Lubrication

• Checking for hot spots

• Checking for increases or changes in vibrationand noise

• Recording of operating pressures and temperatures

Above all, a blower must be operated within itsspecified rating limits, to obtain satisfactory service life.

A newly installed blower should be checked oftenduring the first month of full-time operation. Attentionthere after may be less frequent assuming satisfactoryperformance. Lubrication is normally the most impor-tant consideration and weekly checks of lubricantlevels in the gearbox and bearing reservoirs shouldbe customary. Complete oil change schedules arediscussed under LUBRICATION.

Driver lubrication practices should be in accordancewith the manufacturer’s instructions. If direct connectedto the blower through a lubricated type coupling, thecoupling should be checked and greased each timeblower oil is changed. This will help reduce wear andprevent unnecessary vibration. In a belted drivesystem, check belt tension periodically and inspectfor frayed or cracked belts.

In a new, and properly installed, unit there is no contact

between the two impellers, or between the impellersand cylinder or headplates. Wear is confined to thebearings (which support and locate the shafts) the oilseals, and the timing gears. All are lubricated and wearshould be minimal if clean oil of the correct grade isalways used. Seals are subject to deterioration as wellas wear, and may require replacement at varying periods.

Shaft bearings are designed for optimum life underaverage conditions with proper lubrication and arecritical to the service life of the blower. Gradualbearing wear may allow a shaft position to changeslightly, until rubbing develops between impeller andcasing. This will cause spot heating, which can bedetected by observing these surfaces. Sudden bearingfailure is usually more serious. Since the shaft andimpeller are no longer supported and properly located,extensive general damage to the blower casing andgears is likely to occur.

Oil seals should be considered expendable items, tobe replaced whenever drainage from the headplate

vent cavity becomes excessive or when the blower isdisassembled for any reason. Some oil seal leakagemay occur since an oil film under the lip is required forproper operation. Periodically leaked oil should bewiped off from surfaces. Minor seal leakage shouldnot be considered as indicating seal replacement.

Timing gear wear, when correct lubrication is main-tained, should be negligible over a period of years.Gear teeth are cut to provide the correct amount ofbacklash, and gears correctly mounted on the shaftswill accommodate a normal amount of tooth wearwithout permitting contact between lobes of the twoimpellers. However, too high an oil level will causechurning and excessive heating. This is indicated byunusually high temperature at the bottom of the gearhousing. Consequent heating of the gears will resultin loss of tooth-clearance , backlash and rapid wear ofthe gear teeth usually will develop. Continuation of thistooth wear will eventually produce impeller contacts

(knocking), and from this point serious damage will beunavoidable if blower operation is continued. A similarsituation can be produced suddenly by gear toothfracture, which is usually brought on by sustainedoverloading or momentary shock loads.

Problems may also develop from causes other thaninternal parts failure. Operating clearances within ablower are only a few thousandths of an inch.Thismakes it possible for impeller interference or casingrubs to result from shifts in the blower mounting, orfrom changes in piping support. If this type of troubleis experienced, and the blower is found to be clean, tryremoving mounting strains. Loosen blower mountingbolts and reset the leveling and drive alignment.Thentighten mounting again, and make sure that all pipingmeets blower connections accurately and squarelyForeign materials in the blower will also cause trouble,which can only be cured by disconnecting the pipingand thoroughly cleaning the blower interior.

A wide range of causes & solutions for operatingtroubles are covered in the TROUBLE SHOOTINGCHECKLIST. The remedies suggested should beperformed by qualified mechanics with a goodbackground. Major repairs generally are to beconsidered beyond the scope of maintenance,and should be referred to ROOTS.

Warranty failures should not be repaired at all, unlessspecific approval has been obtained through ROOTSbefore starting work. Unauthorized disassembly withinthe warranty period may void the warranty.



ALLOWABLE OVERHUNG LOADS FOR V-BELT DRIVES UNIVERSAL RAI ® /URAI™-JUNITS

A 1/4" Max

Belt Pull lbs =252100 • Motor HP

Blower RPM • Sheave Diameter

Frame Dimension Max Allowable Min SheaveSize “A” Shaft Load (lb-in.) Diameter

22, 24 0.61 150 4.00

32, 33, 36 0.80 400 5.00

42, 45, 47 1.02 650 5.00

53, 56, 59 1.13 1,325 6.00

65, 68, 615 1.36 2,250 8.00

76, 711, 718 1.16 2,300 9.50

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 sidefor horizontal units.

ROOTS recommends 3V, 5V or 8V belts and sheaves.

FIGURE 2

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

2



AIR BLOWER INSTALLATION WITH ACCESSORIES

Manual Discharge Unloading Valve

Inlet Air FIlter

Vacuum Relief Valve

Temperature Gauge

Manometers

InletSilencer

Temporary Screen

Expansion Joint

Expansion Joint with Control Unit

AIR BLOWER

Back PressureRegulator (optional)

Pressure Relief Valve

Check Valve

Isolation Valvewith Limit Switch

Temperature Gauge

Discharge Silencer

*Differential Pressure &Temperature Switches

Above are suggested locations for available accessories.

GAS BLOWER INSTALLATION WITH ACCESSORIES

InletSilencer

TemperatureGauge

TemperatureGauge

Expansion Joint with Control UnitDifferrential Pressure &Temperature Switches

GAS BLOWER

CheckValve

DischargeSilencer

TemporaryStarting Valve

Back-PressureRegulator

By-Pass Cooler

Pressure Relief Valve

PressureGauge Vacuum

ReliefValve

Normal Starting Valve

Temporary Screen

Expansion Joint

Above are suggested locations for available accessories.

FIGURE 3



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 END

UNIVERSAL RAI ® SERIES & URAI™-G GAS BLOWERS

Special Note: WHISPAIR™ models are designed tooperate with only one shaft rotation direction to takefull advantage of the Whispair feature. Therefore, aWHISPAIR™ blower may be operated in the followingcombinations.

• CCW Rotation: Bottom Shaft; Right side dischargeor a Left Shaft; Bottom discharge

• CCW Rotation: Top Shaft; Left side discharge or aRight Shaft;Top discharge

• CW Rotation: Bottom Shaft; Left side discharge ora Right Shaft Bottom discharge

• CW Rotation: Top Shaft; Right side discharge or aLeft Shaft Top discharge

FIGURE 4

or



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 Vacuum

Size Diameter (Inch) RPM F° (C°) PSI (mbar) INHG (mbar)

TABLE 1

DRIVE END BREATHER ORIENTATION FOR U-RAI SERIES - DSL WITH OIL LUBE



RECOMMENDED OIL GRADES

Ambient ISOTemperature °F (°C) Viscosity No.

Above 90° (32°) 320

32° to 90° (0° to 32°) 220

0° 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) 16.0 (.47)

33 8.5 (.25) 16.0 (.47)

36 8.5 (.25) 16.0 (.47)

42 12.7 (.37) 22.8 (.67)

45 12.7 (.37) 22.8 (.67)

47 12.7 (.37) 22.8 (.67)

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)

UNIVERSAL URAI ® SERIES WITH GREASE LUBRICATED DRIVE END:SUGGESTED BEARING GREASING INTERVALS

Speed In RPM Operating Hours Per Day

8 16 24

Greasing Intervals in Weeks

750-1000 7 4 2

1000-1500 5 2 1

1500-2000 4 2 1

2000-2500 3 1 1

2500-3000 2 1 1

3000 and up 1 1 1

TABLE 4

TABLE 2

UNIVERSAL URAI ® SERIES-DSL

SPLASH LUBRICATED DRIVE END

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

Vertical Horizontal

22 N/A N/A24 N/A N/A

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)76 N/A N/A

711 N/A N/A

718 N/A N/A

Use a good grade of industrial type non-detergent, rust inhibiting, anti-foaming oil and of correct viscosity per Table 2. *ROOTS™ synthetic oil(ROOTS P/N 813-106-) is highly recommended. ROOTS™ does NOTrecommend automotive type lubricants, as they are not formulated withthe properties mentioned in the chart to the left.

TABLE 3: APPROXIMATE OIL SUMP CAPACITIES

When servicing drive end bearings of a Gasblower, use a NLGI #2 premium grade aluminumcomplex* grease with 300°F (149°C) servicetemperature and moisture resistance and goodmechanical stability. Using a pressure gun, slowlyforce new lubricant into each drive end bearing

housing until traces of clean grease comes out ofthe relief fitting.

When servicing drive end bearings of Non Gasblower, use a NLGI #2 premium grade microgelgrease with 250°F (121°C) service temperatureand moisture resistance and good mechanicalstability. ROOTS recommends Shell Darina EPNLGI Grade 2. Product Code 71522.

NOTE: Lithium based greases are notcompatible with the ROOTS Synthetic greaseused when assembling a Gas blower or thenon-doap base grease used when assemblinga standard URAI blower. Lithium based greaseis not approved for any 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.



G F E D C B A

1 1

1 0

9

8

7

6

5

4

3

2

1 1

1 0

9

8

7

6

5

4

3

2

1

T H I S D O C U M E N T C O N T A I N S C O N F I D E N T I A L I N F O R M A T I O N O F

R O O T S D I V I S I O N ,

D R E S S E R I N D U S T R I E S ,

I N C .

I T S H A L L

B E H E L D I N S T R I C T E S T C O N F I D E N C E ,

A N D B E U S E D O N L Y

I N C O N J U N C T I O N W I T H R O O T S D I V I S I O N B U S I N E S S .

M F G .

R E F .

R E V

C A D F I L E / D I R E C T O R Y

R E F : E P 9 3 8

C O N C E N T R I C I T Y

P E R P E N D I C U L A R I T Y

P R O F I L E O F L I N E

P R O F I L E O F A S U R F A C E

D I A M E T E R

F I N I S H I N M I C R O I N C H E S

F L A T N E S S

A N G U L A R I T Y

P A R A L L E L I S M

T R U E P O S I T I O N

S T R A I G H T N E S S

ÿ

R E V I S I O N S

B Y

D A T E

N O T I C E

C H A N G E

C H K D .

A P P

S C A L E

D B V

A P P .

C H K D .

D R .

D A T E

D I M E N S I O N A L T O L E R A N C E S U N L E S S O T H E R W I S E S P E C I F I E D

T W O P L A C E D E C I M A L S ( . X X ) - - - ± . 0

1 5

F R A C T I O N A L - - ± 1 / 6 4

T H R E E P L A C E D E C I M A L S ( . X X X ) - - ± . 0

0 5

F I N I S H E D D I M E N S I O N S

M A T ' L .

P A T T .

N o .

P A R T N o .

P A R T N A M E

A L L D I M E N S I O N S S H

O W N I N B R A C K E T S { } A R E M I L L I M E T E R S

O R D E R

N o .

N o .

R E Q ' D .

S E E N O T E

" E "

2 5

1 4

1 3

6 4 7 2 0 0 2 3

S E C T I O N A L A S S E M B L Y

2 - 1

/ 2 T H R U 5 " U - R

A I B L O W E R S

T A P E R B O R E G E A R S

" X " ± . 0

0 5

S I Z E

0 . 8 3 1

0 . 7 3 1

0 . 5 8 5

0 . 4 2 7

5 4 3 - 1

/ 2

2 - 1

/ 2

A -

I N S T A L L I T E M # 2 0 ( S C R E W ) I N A S S E M B L Y

B -

S E E O P E R A T I N G M A N U A L I R B - 1 8 0 F O R

L U B R I C A T I O N I N S T R U C T I O N

C - 2 - 1

/ 2 , 3 - 1

/ 2 , &

4 " R E Q ' D S O C . H

D .

O N G . E . O

N L Y

E -

R E Q ' D O N 2 2 & 4 2 O N L Y

F -

N U T T O B E T O R Q U E D T O :

2 - 1

/ 2 - - - 6 0 L B . F

T .

3 - 1

/ 2 - - - 1 1 0 L B . F

T .

4 - - - - - - - 1 9 0 L B . F

T .

5 - - - - - - - 2 5 0 L B . F

T .

G -

F O R S I G H T G L A S S U N I T S O N L Y .

U S E W A S H E R O U T S I D E O F G E A R B O X .

U S E R E D L O C T I T E O N T H E T H R E A D S .

N O T E S :

S E E N O T E " A "

( D O N O T D R I L L

T H R U )

S E E N O T E

" F "

S E E N O T E

" C "

S E E N O T E

" B "

S E E T A B L E

1 1 . 2

3 7 8

3 7

4 2 1

8 3 9

3 9

3 5

4 0

1 8

3 8

5

1 9

3 3 1

5 2

3 2

3 5

1 2

3 5

3 2

7

2 1

2 3

3 9 2 0

8 1 7

4

1 4

3 4

3 1

2 7

1

1 6

1 1

3 2

2 7

H J

4 5

S E E N O T E " G "

4 6

2 6

C O N F I D E N T I A L

D O N

O T S C A L E F O R D I M E N S I O N S

I T E M 2 5

R E V I S E D P E R E C N

3 3 3 9 - V

9 - 0 3

8 7

R E M

D

A P

F C R

A P

c M C

F C R

F C R

L U B R I C A T I O N N O T E B R E V I S E D

3 - 1 9

8 7

R E M

C

6 - 1 8 - 8 5

R M

8 - 7 - 8 6

8 - 2 6 - 8 6

1 0 - 1 6 - 8 6

F U L L

/ P A R T S / X X A S

6 - 2 5 - 8 5

6 - 2 7 - 8 5

A P

F R

D B

R E D R A W

N

B

I T E M # 4 2

M O V E D

R M

R M

R E V P E R

E C N

A

F C R

A P

E

I N C R E A S

E D G E A R N U T T O R Q U E

J H B

5 -

3 - 9

0

3 5 7 7 V

F

R E V I S

E D P E R E C N

J H B

2 - 1 2 - 9 3

3 8 0 4

- V

G

D E L E T E D I T E M 4 1

V C

0 4 / 3 0 / 0 1

T -

5 1

A D D

L I F T I N G L U G I T E M # 4 6

R K

0 4 / 1 5 / 0 2

T 1 2 2

A G P

J H

A G P

B D R # 2 7

0 1 / 1 5 / 0 2

R K

A D D I T E M # 4 5 F O R S I G H T G L A S S U N I T S

F : \

F I L E \

F O R M \

D S I Z E . G

C M

A

S S E M B L Y O F U N I V E R S A L R A I ®

S E R I E S , A I R B L O W E R S ,

2 - 1 / 2 ” T

H R U 5 ” G E A R D I A M E T E R



A S S E M B L Y O F U N I V

E R S A L R A I ®

B L O W E R S ,

6 ” A N D

7 ” D I A M E T E R



A S S E M B L Y O F U N I V E R S A L R

A I ™ - G S E R I E S G A S B L O W E R S , 3 -

1 / 2 ” T H R U 5 ” G E A R D I A M E T E R

G F E D C B A

G F E D C B A

1 1

1 0

9

8

7

6

5

4

3

2

1 1

1 0

9

8

7

6

5

4

3

2

1


R O O T S D I V I S I O N , D

R E S S E R I N D U S T R I E S ,

I N C .

I T S H A L L

B E H E L D I N S T R I C T E S T C O N F I D E N C E , A

N D B E U S E D O N L Y


M F G .

R E F .


D O

N O T S C A L E F O R D I M E N S I O N S

R E V

R E F : E P 9 3 8





D I A M E T E R


F L A T N E S S

A N G U L A R I T Y




ÿ

R E V I S I O N S

B Y

D A T E

N O T I C E

C H A N G E

C H K D .

A P P

S C A L E

D B V

A P P .

C H K D .

D R .

D A T E



1 5

F R A C T I O N A L - - ± 1 / 6 4


0 5


M A T ' L .

P A T T . N

o .

P A R T N o .

P A R T N A M E

A L L D I M E N S I O N S

S H O W N I N B R A C K E T S { } A R E M I L L I M E T E R S

O R D E R

N o .

N o .

R E Q ' D .

2 5

1 3

T 3 0 0 9 9 0 2 3

S E C T I O N A L A S S E M B L Y

3 - 1

/ 2 T

H R U 5 " U - R

A I G A S B L O W E R S

A -

U S E L O C K T I T E # 2 ( 3 0 5 1 5 ) B E T

W E E N H E A D P L A T E A N D

C Y L I N D E R J O I N T S .

B -

S E E O P E R A T I N G M A N U A L I R B - 1 8 0 F O R G A S B L O W E R S

F O R L U B R I C A T I O N I N S T R U C T I O

N .

C - 3 6 , 4

5 & 4 7 R E Q ' D S O C . H

D . O

N G . E . O

N L Y

E -

R E Q ' D O N 3 2 ,

3 3 & 4 2 U R A I - G

O N L Y - S

E A L I N G

W A S H E R S & B U T T O N H E A D C A P S C R E W S .

F -

N U T T O B E T O R Q U E D T O :

3 - 1

/ 2 - - - 1 1 0 L B . F

T .

4 - - - - - - - 1 9 0 L B . F

T .

5 - - - - - - - 2 5 0 L B . F

T .

N O T E S :

S E E N O T E

" F "

S E E N O T E

" C " & " E "

S E E N O T E

" B "

3 9 4 0 1 8 3 8

5 1 9

3 3 1

5 2

3 2

3 5

1 2

7

2 1

2 3 3 9 8

1 7

4

1 4

3 4

3 1

2 7

1

1 6

1 1

3 2

2 7

H

0 . 0

0 0 0

4

4

S E E N O T E

" E "

0 . 0

0 0 0

0 . 0

0 0 0 V

I E W

" X "

3 7

4 5

D

4 3

4 6

2 6

2 0

A G P

R K

R K

R K

R K

A D D I T E M S 8 & 2 0 ( N A M E P L A T E & S C R E W )

R K

D

01/ 10/01

v c

0 7 / 2 5 / 0 1

1 2 / 0 5 / 0 1

0 4 / 1 2 / 0 2

F U L L

R K

A D D L I F T I N G L U G I T E M # 4 6

B

A D D 3 3 U R A I - G T O N O T E E A N D

D E L .

F R O M N O T E C

V C

R K

P I C T U R E C H A N G E

A

P R O T O

A A

T 1 0 2

A G P

C

T 1 2 2

A G P

0 8 / 1 6 / 0 2

T 1 2 9

F : \

F I L E \

F O R M \

D S I Z E . G

C M



A S S E M B L Y O F U N I V E R S A L R A I ®

S E R I E S G A S B L O W E R S ,

6 ” G E A R D I A M E T E R

G F E D C B A

G F D C

1 1

1 0

9

8

7

6

5

4

3

2

1 1

1 0

9

8

7

6

5

3

2

1


R O O T S D I V I S I O N , D

R E S S E R I N D U S T R I E S , I N

C .

I T S H A L L

B E H E L D I N S T R I C T E S T C O N F I D E N C E ,

A N D B E U S E D O N L Y


M F G .

R E F .

R E V


R E F : E P 9 3 8





D I A M E T E R


F L A T N E S S

A N G U L A R I T Y




ÿ

R E V I S I O N S

B Y

D A T E

N O T I C E

C H A N G E

C H K D .

A P P

S C A L E

D B V

A P P .

C H K D .

D R .

D A T E


1 5

F R A C T I O N A L - - ± 1 / 6 4


0 5


M A T ' L .

P A T T .

N o .

P A R T N o .

P A R T N A M E

A L L D I M

E N S I O N S S H O W N I N B R A C K E T S { } A R E M I L L I M E T E R S

O R D E R

N o .

N o .

R E Q ' D .

S E C T I O N A L A S S E M B L Y T

3 0 1 1 0 0 2 3

B


D O N O T S C A L E F O R D I M E N S I O N S

F O R 6 " U - R

A I G A S B L O W E R S

N O T E S

A U S E L O C K T I T E # 2 ( 3 0 5 1 5 ) B E T W

E E N

H E A D P L A T E A N D C Y L I N D E R J O I N T S .

B S E E O P E R A T I N G M A N U A L I R B - 1 8 0 F O R

L U B R I C A T I O N I N S T R U C T I O N

C N U T T O B E T O R Q U E D T O :

6 " - - - 4 0 0 L B . F

T .

" X "

1

1 1

1 3

2 6

2 7

2 5 1 9

3 3

2 7

2 9

2 5

3 4

3 1

1 4 3 8 9 1

7

4

2 1

2 3

1 6

1 2

3 0

3 2

0 . 0

0 0 0

S E E N O T E " C "

4 2

3 2

3 7 1

8 3 5

3 9

3 6

3 8

1 5

0 . 0

0 0 0

0 . 0

0 0 0

4 3

4 4

7

4 5

V I E W

" X "

0 . 1

9 8 0 A

2

0

N T S

R E F . 6

4 7 9 2 0 2 3

B

P I C T U R E C H A N G E

A D D E D D I M E N S I O N . 0

6 6

V C

C

A D D I T E M S # 8 & 2 0 ( N A M E P L A T E & S C R E W )

V C

R K

V C

0 1 / 1 2 / 0 1

A

0 6 / 2 6 / 0 1

P R O T O

0 7 / 2 5 / 0 1

P R O T O

R K

R K

B B

B B 0 8 / 1 6 / 0 2

T 1 2 9

R K

F : \

F I L E \

F O R M \

D S I Z E . G

C M



UNIVERSAL RAI ® SERIESBLOWERS PARTS LIST6” & 7” GEAR DIAMETER(Refer to drawing #64792023)

1 Headplate Gear End 1

2 Headplate Drive End 1

3 Gearbox 1

4 Timing Gears 2

5 Cover-Blind (Plug Opening) 1

7 Gasket, Gear Box 1

11 Cylinder 1

12 Impeller & Shaft Drive 1

13 Impeller & Shaft Driven 1

14 Bearing, Ball 3

15 Bearing, Roller 1

16 Pin, Dowel 4

17 Gear Nut 2

19 Key 1

21 Plug, Pipe 323 Screw Hex Nylock 8

25 Breather (Plug Vent) 1

26 Screw, Hex *

27 Seal, Lip Bearing 4

31 Screw, Hex, Nylock 4

32 Screw, Hex 10

33 Seal Lip-Drive 1

34 Clamp Plate 2

35 Foot 2

37 Fitting, Grease 2

38 Fitting, Relief 2

39 Washer Mounting 4

Item # Part Name Qty.

*Quantities vary by blower.

UNIVERSAL RAI ® SERIESBLOWERS PARTS LIST2-1/2” – 5” GEAR DIAMETER(Refer to drawing #64720023)



3 Gearbox 1

4 Timing Gears 2



11 Cylinder 1



14 Bearing, Ball 3


16 Pin, Dowel 4

17 Gear Nut 2

19 Key 1

21 Plug, Pipe 323 Screw Hex 6


26 Screw, Hex *



32 Screw, Hex 6

33 Seal Lip-Drive 1

34 Clamp Plate 2

35 Foot 2




40 Screw Socket 2

42 Screw Hex 2



UNIVERSAL RAI ® -DSL SERIEBLOWERS PARTS LIST3-1/2” – 5” GEAR DIAMETER(Refer to drawing #T30356023)



3 Gearbox 1

4 Timing Gears 2


11 Cylinder 1



14 Bearing, Ball 3


16 Pin, Dowel 4

17 Gear Nut 2

19 Key 1

21 Plug, Pipe 3

23 Screw Hex 625 Breather (Plug Vent) 1

26 Screw, Hex *



32 Screw, Hex 6

33 Seal Lip-Drive 1

34 Clamp Plate 2

35 Foot 2


40 Screw Socket 2

42 Screw Hex 2

48 DE Oil Slinger Set Screw 4

50 Drive End Cover 1

52 Drive End Oil Slinger 2

Item # Part Name Qty


UNIVERSAL RAI ® -DSL SERIES BLOWERS PARTS LIST6” GEAR DIAMETER(Refer to drawing #T30382023)



3 Gearbox 1

4 Timing Gears 2

7 Gasket, Gear Box 111 Cylinder 1



14 Bearing, Ball 3


16 Pin, Dowel 4

17 Gear Nut 2

19 Key 1



21 Plug, Pipe 3

23 Screw Hex Nylock 8


26 Screw, Hex *



32 Screw, Hex 10

33 Seal Lip-Drive 1

34 Clamp Plate 2

35 Foot 2


48 DE Oil Slinger Set Screw 4

50 Drive End Cover 1

52 Drive End Oil Slinger 2




UNIVERSAL RAI ® SERIESGAS BLOWERS PARTS LIST6” GEAR DIAMETER(Refer to drawing #T3011023)


2 Headplate Drive End 13 Gearbox 1

4 Timing Gears 2



11 Cylinder 1



14 Bearing, Ball 3


16 Pin, Dowel 4

17 Gear Nut 2

19 Key 1

21 Plug, Pipe 3

23 Screw Hex Nylock 825 Breather (Plug Vent) 1

26 Screw, Hex 14*

27 Seal, Bearing 4

31 Screw, Hex 4

32 Screw, Hex 10

33 Seal Lip-Drive 1

34 Clamp Plate 2

35 Foot 2




40 Screw Socket 2

42 Screw Hex 243 Plug 8



UNIVERSAL RAI ® SERIESGAS BLOWERS PARTS LIST3-1/2” & 5” GEAR DIAMETER(Refer to drawing #T30099023)


2 Headplate Drive End 13 Gearbox 1

4 Timing Gears 2



11 Cylinder 1



14 Bearing, Ball 3


16 Pin, Dowel 4

17 Gear Nut 2

19 Key 1

21 Plug, Pipe 3

23 Screw Hex 825 Breather (Plug Vent) 1

26 Screw, Hex 14*

27 Seal, Bearing 4

31 Screw, Hex 4

32 Screw, Hex 4

33 Seal Lip-Drive 1

34 Clamp Plate 2

35 Foot 2




40 Screw Socket 2

42 Screw Hex 2



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

Quart 813-106-004

Gallon 813-106-005

Case (12 qts) 813-106-007

ROOTS Synthetic Grease: NLGI #2

14.5 oz.Tube T200019-001

5 Gallon Pail T200019-003

Case (30 tubes) T200019-002

SUGGESTED LUBRICANTS




S E R I E S - D S L W I T H S P L A S H L U B R I C A T

E D D R I V E E N D 3 - 5 ” G E A R D I A M

E T E R




S E R I E S -

D S L W I T H S P L A S H L U B R I C A T E D

D R I V E E N D 6 ” G E A R D I A M E T E R



M E T R I C

U N I V E R S A L R A I ®

S E R I E S



CONTACT LIST

CUSTOMER SERVICE

Dresser ROOTS2135 Hwy 6 SouthHouston, TX 77077

Toll Free Hot Line: 1-877-363-ROOT(S) (7668)Toll Free Fax: 1-877-357-7238

Local Fax: 281-966-4309

ROOTS Factory Service & Repair Center11611B Tanner RDHouston, TX 77041

Toll Free: 1-800-866-6182Local Phone: 713-896-4810

Local Fax: 713-896-4927

Service & WarrantyToll Free: 1-800-866-6182

Local Phone: 832-467-4614Local Fax: 713-896-4927

Dresser ROOTS2135 Hwy 6 SouthHouston, TX 77077PH: 281-966-4700FX: 281-966-4309T ll F 1 877 363 ROOT(S)

Dresser ROOTS - Connersville900 West Mount StreetConnersville, IN 47331PH: 765-827-9200FX: 765-827-9266

Dresser ROOTS - Holmes OperationPO Box B7Off St. Andrews RdTurnbridge, HuddersfieldEngland HD1 6RBPH 44 1484 422222

Dresser, Inc

SOPLADORES URAI MANUAL.pdf

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