Roots RAS And RAS-J Whispair* Blower - 10”-20” Splash .
www.howden.comRoots* RAS and RAS-JWhispair* Blower - 10”-20” Splash LubricatedInstallation Operation & Maintenance ManualILRB 3000 Roots RAS RAS J Splash Blower IOM 12.15.indd 111/12/2015 11:38:37
ContentsInformation Summary.1Troubleshooting Checklist.14Operating Characteristics.3Rotary Lube Blower Vibrations.15Operating on.4Repair Kit 12Parts Lists.23Safety Precautions .12Assembly Drawings.24, 25, 26Preventive Maintenance.13Do these things to get the most from your Roots BloweroUnpack shipment carefully, and check contents againstPacking List. Notify Howden if a shortage appears.Make sure both driving and driven equipment iscorrectly lubricated before start-up. SeeLUBRICATION.ooStore in a clean, dry location until ready forinstallation. Lift by methods discussed underINSTALLATION to avoid straining or distorting the equipment. Keep covers on all openings. Protect againstweather and corrosion if outdoor storageis necessary.In event of trouble during installation or operation, donot attempt repairs of Howden furnished equipment. NotifyHowden, giving all nameplate information plus an outlineof operating conditions and a description of the trouble.Unauthorized attempts at equipment repair may voidHowden warranty.ooRead OPERATING LIMITATIONS and INSTALLATIONsections in this manual and plan the completeinstallation.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 theoProvide for adequate safeguards against accidentsto persons working on or near the equipment during bothinstallation and operation. See SAFETYPRECAUTIONS.oInstall all equipment correctly. Foundation design must beadequate and piping carefully done. Use recommendedaccessories for operating protection.oCheck shipment for damage. If found, file claim withcarrier and notify Howden.odate of publication. Howden reserves the right to make designor material changes without notice, and withoutobligation to make similar changes on equipment ofprior manufacture.Roots products are sold subject to Howden’s general terms of sale and warranty policy; contact your nearest Howden office for more information.2ILRB 3000 Roots RAS RAS J Splash Blower IOM 12.15.indd 2GEA20261 ILRB 300011/12/2015 11:38:37
Operating CharacteristicsThe Roots air blowers described in this manual representboth the basic type of Roots Anti-friction System (RAS) rotarylobe arrangement and the proprietary Roots RAS WHISPAIRdesign, with gear diameters ranging from 10 to 20 inches.All units are equipped with an effective splash oil lubricationsystem.The Roots RAS BlowerThe Roots RAS rotary lobe blower is a positive displacementunit; its pumping capacity is determined by size, operatingspeed, and inlet conditions. It has two double-lobe impellersmounted on parallel shafts and rotating in oppositedirections within a cylinder closed at the ends by headplates.As the impellers rotate, air is drawn into one side of the cylinderand forced out the opposite side against the existing pressure.The differential pressure developed depends on the resistanceof the connected systems.Effective sealing of the blower inlet area from thedischarge area is accomplished using very smalloperating clearances. This feature significantly reducesrubbing contact between rotating and stationary parts, removing the need for internal lubrication. Clearancesbetween the impellers during rotation are maintained bya pair of accurately machined timing gears mounted on thetwo shafts that extend outside the air chamber.Operation of the RAS rotary lobe blower is illustrated in Figure1, where air flow is from right to left from inlet to discharge, withthe lower impeller rotating clockwise. In Position 1, it delivers a known volume (A) to the discharge, while the space (B)between the upper impeller and cylinder wall is being filled.Counterclockwise rotation of this impeller then traps an equalvolume (B) in Position 2, and furtherrotation delivers it to the discharge in Position 3. At the sametime, another similar volume is forming under the lower impeller, and will be discharged when rotation reaches Position 1again.One complete revolution of the driving shaft alternately trapsfour equal and known volumes of air (two by each impeller) andpushes them through to the discharge. The pumping capacity of a lobe blower operating at a constant speed thereforeremains relatively independent of reasonable inlet or dischargepressure variations. To change the capacity it is necessary tochange the speed of rotation or vent some of the air.As shown in Position 1 in Figure 2, the known volume (A) isdelivered to the discharge chamber while the space (B) is filledwith an equal volume at inlet pressure. In Position 2 the spacehas been sealed from an inlet, but somedischarge pressure is entering the space (B) through the slotpassage, as indicated by the small arrows. The force of the jetassists the rotation of the impeller, while also building pressurein the sealed space (B). Rotation continues toPosition 3, where the volume (B) is delivered to the dischargechamber in the same manner as the volume (A) in Position 1.Because of the almost complete pressureequalization through the slot, shock is minimized.Notes and WarningsWith either blower design, no attempt should ever be madeto control capacity by means of a throttle valve in the intake ordischarge piping. This increases the power load on the driverand may seriously damage the blower. Similarly, if a possibilityexists that flow to the blower inlet may be cut off during normaloperations, then an adequate vacuum relief valve should beinstalled in the inlet line near the blower. A pressure relief valvein the discharge line near the blower is also strongly recommended for protection against cut-off or blocking in this line.When a belt drive is employed, blower speed can usually beadjusted to obtain the required capacity by changing thediameter of one or both sheaves. In a direct-coupledarrangement, a variable speed motor or transmission isrequired, or air may be vented through a manuallycontrolled unloading valve and silencer. If discharge air is returned to the blower inlet, it must go through a cooling by-passarrangement.Before making any change in blower capacity or operatingconditions, contact the nearest Howden office for specificinformation applying to your particular blower. In all cases,operating conditions must be maintained within the approvedrange or pressures, temperatures and speeds as stated underLIMITATIONS. Also, serious damage to the rotating parts of theblower will result if it is used to handle air that contains liquidsor solids.The Roots RAS WHISPAIROperation of the proprietary Roots RAS WHISPAIR blower isrepresented in Figure 2. Just as in the standard Roots RASblower, the air flow is from right to left, with the lower shaftrotating clockwise. This design differs from the basicRAS rotary blower in that it provides a chamber on the discharge side of the cylinder.From this chamber, two or more slots open back into the twoalternately closed pocket areas of the cylinder (shown as A andB). These slots, at certain impeller positions, allow dischargepressure to bleed into the normally low pressure pockets. Theyalso provide a jet action on the impellers in the direction of rotation. Gradual pressure buildup in the pockets, to a level almostequal to the discharge pressure, reduces the backflow rate atthe instant of pocket discharge, effectively minimizing pulsingand shock noise.GEA20261 ILRB 3000ILRB 3000 Roots RAS RAS J Splash Blower IOM 12.15.indd 3Figure 1 - Flow Through a Basic Type RAS BlowerFigure 2 - Flow Through a RAS WHISPAIR Blower311/12/2015 11:38:39
Operating LimitationsA Roots blower must be operated within certain approved limiting conditions to enable continued satisfactory performance.The Howden warranty is contingent on such operation.On vacuum service, with the discharge to atmospheric pressure, the inlet suction or vacuum must not be greater than thevalues listed for the specific frame size.RAS/RGS and RAS/RGS WHISPAIR blowers are available withtwo types of internal blower clearances, normal and open.Maximum limits for pressure, temperature, vacuum, and speedare specified in Table 1 for both types of clearances. Verify withthe factory that your blower is supplied with open clearancesbefore operating it within the specified conditions. Table 8 liststhe values of normal clearances and Table 9 lists the values ofopen clearances. Do not exceed any single limit or combination of limits listed in Table 1.Temperature - Blower frame sizes are approved only forinstallations where the following temperature limitations can bemaintained in service:Be sure to arrange connections or taps for thermometers andpressure or vacuum gauges at or near the inlet and dischargeconnections of the blower. These, along with a tachom eter,will enable periodic checks of operating conditions.Note: Some special purpose blowers may be assembled withnon-standard clearances other than those shown in Table 8or 9. These units may be operated at pressure and or temperature rises higher than those listed in applicable Table 1.However, you must request specific approvalfrom the nearest Howden office before doing so, otherwisethe warranty will be voided. Normally, when a blower isoperated at the design conditions stamped on itsnameplate, the specified limits apply.Pressure- The pressure rise, between blower inlet and dis-charge, must not exceed the figure listed for the specific unitframe size concerned. Also, in any system where the unit inletis at a positive pressure above atmosphere, adischarge pressure of 25 PSI (172 kPa) should not beexceeded, regardless of blower size.InstallationSupervision of the installation by a Howden service engineeris not usually required for these units. Technicians with generalexperience in installing heavy machinery should be able to produce satisfactory results. However, a Howden service engineermay be engaged for assistance or for finalchecking of an installation.Note: The information contained in this manual is intended tosupplement more detailed discussions of foundations and piping found in API recommended practice 686 and the Compressed Air and Gas Handbook, published by the CompressedAir and Gas Institute, New York City, and the American Petroleum Institute, Washington, D.C.LocationBecause the unit is completely enclosed, the location of theinstallation is typically not critical. While a clean, dry, andprotected indoor location is preferred, an outdoor location willgenerally provide satisfactory service. Important requirementsare that the correct grade of lubricating oil be provided for theexpected operating temperatures, and that the unit is locatedso that routine checking and servicing can be convenientlyperformed.4ILRB 3000 Roots RAS RAS J Splash Blower IOM 12.15.indd 4 Measured temperature rise must not exceed listed valueswhen the inlet is at ambient temperatures.Ambient is considered as the general temperature of thespace around the blower. This is not outdoortemperature, unless the blower is installed outdoors. If inlet temperature is higher than ambient, the listed allowable temperature rise values must be reduced by twothirds of the difference between the actual measured inlettemperature and the ambient temperature.Speed- Blowers may be operated at speeds up to themaximums listed for the various frame sizes. They maybe directly coupled to suitable constant speed drivers if pressure/temperature conditions are also within limits.At low speeds, excessive temperature rise may be alimiting factor.Special Note: The listed maximum allowable temperature rise(increase in air temperature between inlet and discharge) forany particular blower may occur well before the maximumspeed or maximum pressure rating is reached. This may occur at high altitude, low vacuum or very low speed. The unit’soperating limit is always determined by the maximum ratingreached first pressure, temperature, or speed.ProtectionAs indicated by markings on the flange covers, the internalmachined surfaces of Roots blowers are treated with avaporizing inhibitor after factory assembly to protect againstnormal atmospheric corrosion. Protection against chemical orsaltwater atmosphere is not provided.The maximum period of protection is one year underaverage conditions, if flange covers and closing sealsare not removed. Leave covers and tape seals over all openings as long as possible during installation to avoid loss ofprotection.If there will be an extended period between installationand startup, take the following steps to ensure corrosionprotection:1 Coat the insides of the cylinder, gearbox, and drive endbearing covers with a vapor phase rust-inhibiting liquidsuch as Nox-Rust VCI-10 or equivalent. Repeat once ayear or as conditions require. VCI-10 is oil soluble anddoes not have to be removed before lubricating. If desired,Nox-Rust VCI-10 may be removed from within the cylindershortly before startup by spraying a fine mist of petroleumsolvent through the blower while it is running at a slowspeed with open inlet and discharge, or it can remain in theblower if it is not harmful to the operation of the connectedsystem. Nox-Rust VCI-10 may be obtained from DaubertChemical Co., 2000 Spring Rd., Oak Brook, IL, 60521.GEA20261 ILRB 300011/12/2015 11:38:39
Table 1- Maximum Allowable Operating ConditionsNormal Clearances - RP68FrameSize1006SpeedRPM1800Open Clearances - RP71TemperatureRiseTemperatureRisepsikPaInches Hg.kPa F CPSIkPaInches Hg.kPa F CApprox.Wgt.(lbs.)Pressure RiseInlet VacuumPressure RiseInlet 5015502251251475020221000900** Sizes Not Available in RAS ***Bare Shaft Blower WeightGEA20261 ILRB 3000ILRB 3000 Roots RAS RAS J Splash Blower IOM 12.15.indd 5511/12/2015 11:38:40
2 Paint the shaft extension, inlet and discharge flanges, andall other exposed surfaces with Nox-Rust X-110 or equivalent.3 Seal the inlet, discharge, and vent openings. It is notrecommended that the unit be set in place, piped to thesystem, and allowed to remain idle for extended periods. Ifany part is left open to the atmosphere, the Nox-Rust VCI10 vapor will escape and lose its effectiveness.4 Protect the equipment from excessive vibration during storage.5 Rotate the drive shaft three or four revolutions every twoweeks.6 Prior to startup, remove the flange covers on both theinlet and discharge and inspect the interior to ensure theabsence of rust. Check all internal clearances. Also, removethe gearbox and bearing covers and inspectthe gear teeth and bearings for rust.Before connecting the piping, remove the main flange covers and inspect the blower interior for the presence of foreignparticles or dirt adhering to machined surfaces. Use petroleumsolvent to carefully wash away any material found and thenmanually rotate the impellers to ensure that they turn freely.Use the same solvent to remove the anti-rust coating from theflange faces and any other surfaces. Note: Interior cleaning isnot required if no dirt is found.Equipment Handling/LiftingHandling of the Root blower equipment needs to beaccomplished with care, and in compliance with safe practices. The weight of a bare unit, without the base plate, driver,or accessories, ranges from about 1 ton (910 kg) for thesmallest units to approximately 7 tons (6350 kg). On RAS andRAS-J units, an eyebolt is provided near each end for lifting.Units mounted on a base plate have greater weight and shouldalways be handled using the four lifting hooks provided.Check the eyebolts for tightness, by tapping with a hammer,before lifting the equipment by the eyebolts. Make sure to pullthe bolts in a nearly vertical direction when lifting. To ease theside strain caused by a large cable angle, place a stiff spreaderbetween the eyebolts and adjust the cable lengths so that theunit is approximately level during the lift.Note: A harness with four lifting hooks is required to lift basemounted units. After inserting the hooks in the lifting lugs,block the chains out on the sides to avoid placing the unitunder strain. At the same time, adjust the lengths to produce alevel lift.FoundationBecause many factors, including local soil conditions, impactthe foundation design, this section offers only a general discussion that is intended to be supported by information from theCompressed Air and Gas Handbook referenced earlier. Toensure satisfactory equipment operation, the concrete foundation must be rigid, have minimal defects, and should not beresonant in the frequencies of the operating speed range of theequipment.6ILRB 3000 Roots RAS RAS J Splash Blower IOM 12.15.indd 6The foundation’s length and width must provide at least 6inches (150 mm) from any edge to the nearest machine anchorbolt (based on the location indicated in the certified manufacturer’s general arrangement drawing). The depth dimensionshould be determined by design, with a minimum practicaldepth considered to be twice the distance between the shaftcenters (or gear diameter) of the unit, or sufficient depth toattain a concrete mass a minimum of one-and-a-half times theweight of the blower and motor.The concrete block needs to cure for a minimum of 28 daysbefore the blower is grouted in place. Any block distortionsduring curing will have little or no effect on equipment andalignment. To simplify machine leveling and provide a goodgrouting bond, the top of the foundation should be struckoff as level as possible, but left with a rough surface.We do not recommend spring-type vibration isolating mounting for use directly between the operating equipment and thefoundation. When such mountings are required, they shouldbe designed to carry a reinforced concrete slab on whichthe equipment is mounted. The slab must offer good rigidityagainst bending and twisting. The suspension system requirescareful adjustment to produce a reasonably level condition during operation. All piping requires flexible sections and supportsto reduce connection strains onthe unit.We also do not recommend the direct use of structural framingmembers for mounting the blower base to a building structure.If this is unavoidable, it should be restricted to smaller framesize units, and spring-type mountings should not be used.Structural members must be rigid, and will probably requirereinforcement if they are part of a building. Noise transmissioncan be reduced by using a cork isolation pad to reduce thetransfer of vibration from the blower base to the building structure. The pad should be 1 to 2 inches (25-50 mm) thick, bedding on a full steel plate attached to the structure and carryingthe rigid concrete slab on which the equipment is mounted.Anchor Bolts and Plates - Place anchor bolts within thefoundation forms before the concrete is poured. (See Table 2for the recommended bolt sizes and Figure 3 for proper bolt installation.) The bolts must be located as accurately as possiblebased on the dimensions provided on the certified installationdrawing. To obtain a bolt location tolerance of 1/8-inch (3mm),use drilled templates firmly secured to the foundation forms.It is important to keep the bolt sleeves centered around thebolts and free of concrete to allow the bolts to be sprungenough to correct for small variations in bolt setting and machine drilling. The sleeves are filled in the final grouting operation. Adjust the bolt positions vertically so that the top endsextend at least one-and-a-half diameters above the soleplateor taper washer, or as shown on the installation drawing.Use the provided jack screws for easier height adjustmentleveling. Place steel plates, approximately 4” x 4” x 1/2” (100 x100 x 13 mm, on the foundation under each jack screw location. Plates and anchor bolts are not furnished asstandard accessories.GEA20261 ILRB 300011/12/2015 11:38:40
Units that are mounted on soleplates can be leveled in a similarmanner. The plates should be large enough to provide extensions for leveling in both length and width on the finished uppersurfaces. Solidly fasten the plates to the blower feet, which aremachined flat and parallel to each other. Then install and levelthe blower carefully, using jack screws, shims, or wedges foradjusting. It is very important to eliminate twist. Minor adjustments can be made byplacing shims directly under the blower feet. When asatisfactory level condition is obtained, turn the anchorbolt nuts down snug, but not tight.AligningFigure 3 - Typical Anchor Bolt DetailTable 2A – Standard Anchor Bolts in InchesFor SoleplatesFor 24318BoltsSleevesBoltsSleevesTable 2B – Standard Anchor Bolts in (cm)For SoleplatesFor 046BoltsSleevesBoltsSleevesLevelingBecause the unit should be as level as possible in all directions, we recommend performing this critical step using a goodquality machinist’s level with a ground glass bubble vial. Levelthe blower from the drive shaft and pipe flanges. Machinedbaseplates have pads running along both the length and width.On soleplates, the machined top surfaces are used for leveling.Scrape the pads or surfaces clean, and use a flat file to removeburrs on the high points.When the blower and driver are factory mounted on a commonbaseplate, treat the assembly as a unit for leveling purposes.Use the jack screws to establish the grouting space under thebase flanges and to level the base. Adjust the screws until theindicated variation from the level does not exceed .001 inchper foot (.08 mm per meter) in either length or width. To reducetwist, any variations should all be in the same direction. Themaximum allowable twist is .001 inches per horizontal foot (.08mm per horizontal meter) measured between any two sectionsof the base.GEA20261 ILRB 3000ILRB 3000 Roots RAS RAS J Splash Blower IOM 12.15.indd 7When the blower unit and its driver are direct coupled,careful attention is required to align the drive shafts.Precise alignment helps ensure satisfactory couplingoperation, as well as significantly reducing the chance of damage to either the driving or driven unit from vibrationor thrust forces.For package units with the driver and blower mounted on acommon baseplate, the two shafts have been placed in approximate alignment at the factory. Because baseplate deflections can occur during shipping and installation, it is importantto obtain a close coupling alignment duringleveling to ensure that only small final adjustments willneed to be made after grouting.For soleplate applications, the separately mounted driver mustbe positioned, leveled, and aligned during installation.Whether the unit is on soleplates or its own base, place shims(1/16 to 1/8 inch (2-3 mm) thick) directly under the driver feetbefore setting the unit in place to achieve more accurate finalalignment. Establish spacing between the two shaft ends asrequired by the coupling. If a motor is being used that has endplay in the shaft, be sure its rotor is located on magnetic centerbefore setting this spacing. It also needs a limited end float kit.When the blower is driven through V-belts, the driver must bemounted on an adjustable base to permit tightening or removing of the belts. In this case, the driver shaft height is of noconcern, but it must be parallel to the blower shaft and level.To position the driver properly, mount both sheaves on theirshafts (the shaft center distance mustbe known).Install the narrow hub type of blower sheave (usually the onewith a larger diameter) so that its inner hub face is not morethan 1/4 inch (6 mm) away from the bearing housing endcover. The driver sheave should also be mounted as close toits bearing as possible. Position the driver so that the faces ofthe two sheaves are accurately in line, with the adjustable baselocated so that two-thirds of its total available movement is inthe direction away from the blower. This positioning providesminimum belt wear and slip, and allows sufficient adjustmentfor installing and tightening the belts. Do not install the beltsuntil the grouting has set and the anchor bolts are tightened.Blowers to be driven by v-belts may be provided with anextended drive shaft and an additional outer bearing to handlethe side pull of the drive. Identified by the extended housing forthe outer bearing, these blowers can also be driven by directcoupling to the motor if necessary.711/12/2015 11:38:40
Note: Blowers intended specifically for direct coupling have noouter bearing, and can be seriously damaged if used for beltdrive applications. Consult your Howden salesoffice before belting these units.Groutingso that it can be backed off. Such points of concentratedloading are likely to wear during machine operation, resulting inloose anchor bolts. Final bolt tightening should only be enoughto hold the machine firmly against the foundation and preventvibration.After proper curing, create a roughened top surface by chipping away glazed areas and removing oil or grease using astrong hot detergent or caustic solution.After all anchor bolts are secured, recheck the blower for twistand level. Working from the finished pad on top of the cylinder,make corrections to meet the requirements specified underLEVELING by shimming under the blower feet. Then rotate thedrive shaft by hand to make sure both impellers turn freely at allpositions.Grouting compensates for surface irregularities in the foundation and machine base and also helps restrain shifting.Because anchor bolts are used for hold-down only, the groutunder the soleplate or base flange must be adequately thick, itmust flow into the anchor bolt sleeves and all interior cavities,and it must be a variety that offers minimal shrinkage duringthe setting period. Due to the open frame design, the bedplateshould be filled withconcrete that is level with the top of the main channels.When the blower is directly coupled to its driver, final alignmentof the two shafts should be accomplished by very carefullyadjusting the shims under the driver feet. While a flexiblecoupling can accept some degree of misalignment, it shouldnot be forced to compensate for careless workmanship. Theflexing or sliding member in a coupling transmits undesirableforces between the two shafts in proportion to the degree ofmisalignment, thus promoting vibration and unnecessary wearproblems.Special grouting materials designed to counteract shrinkageare commercially available and are often preferred to cement.Follow the manufacturer’s instructions when using thesematerials. Care must be exercised when employing non-shrinkadditives with cement, as too much can be worse than none.Any gas-forming or air-entraining additives should be avoided,because they tend to reduce grout strength.The t
Jul 10, 2018 · The Roots air blowers described in this manual represent both the basic type of Roots Anti-friction System (RAS) rotary . lobe arrangement and the proprietary Roots RAS WHISPAIR design, with gear diameters ranging from 10 to 20 inches. All units are equipped with an effective splash oil lubrication system. The Roots RAS Blower
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Roots of complex numbers Every number has two square roots. The square roots of 16 are: The square roots of 24 are: The square roots of -81 are: The square roots of -75 are: Likewise, every number has three cube roots, four fourth roots, etc. (over the complex number system.) So if we want to find the four fo
unilateral small kidney IIa B RAS and hypertension with medication intolerance IIa B Preservation of renal function Progressive CKD with bilateral RAS IIa B Progressive CKD with RAS to a solitary functioning kidney IIa B RAS and chronic renal insufficiency with unilateral RAS IIb C
SPLIT TYPE AIR CONDITIONER INDOOR UNIT/OUTDOOR UNIT MODEL RAS-260GHA/RAC-260GHA RAS-350GHA/RAC-350GHA OUTDOOR UNIT INDOOR UNIT RAC-350GHA RAS-260GHA RAS-350GHA Instruction manual Page 1 26 To obtain the best performance and ensure years of trouble free use, please read this instruction manual completely. RAC-260GHA RAS/RAC-260/350GHA (EN1) 1 18 .
AIR CONDITIONER (MULTI-SPLIT TYPE) Installation Manual Outdoor Unit Model name: RAS-3M26U2AVG-E RAS-4M27U2AVG-E RAS-5M34U2AVG-E * NOTE: Descriptions about operations for the E unit in this manual are not applicable to RAS-4M27U2AVG-E. Descriptions about operations for the D unit and the E unit in this manual are not applicable to RAS-3M26U2AVG-E.
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This manual describes how an existing HEC-RAS model can be added to a CHPS configuration. The assumption is that the HEC-RAS model runs in the HEC-RAS GUI without any errors. From there, the several steps to include the model in CHPS are explained. Since the HEC-RAS GUI is Windows based, it is required to have a Windows machine available.
accounting techniques, their definitions, process, advantages, and benefits. KEYWORDS: Accounting, Activity Based Costing, Balanced Scorecard, Budgeting, Just in Time INTRODUCTION There is kind of agreement that accounting is the language of business; to figure out the financial position of an organization; identifying the level of gain or loss which is the result of business' operations, and .
