Alemite Oil Mist Application Manual - CENTRAL-LUBE Oil Mist Application Manual Introduction The Oil Mist principle was developed in the late 1930’s by a European bearing manufacturer

Alemite Oil MistApplication Manual

IntroductionThe Oil Mist principle was developed in the late 1930’s by aEuropean bearing manufacturer. The problem that nurturedthis development was the inability to satisfactorily lubricatehigh-speed spindle bearings on grinders and similarequipment. The speeds of those bearings were too high forgrease lubrication, and the heat generated by fluid friction inliquid oil necessitated the use of costly re-circulatingsystems. Continuous thin-film lubrication with Oil Mistprovided a solution, and the purging of bearing housings thataccompanies this lubrication produced additional benefits.

Stewart-Warner Corporation purchased the rights to Oil Mistin 1949. Since then, the Alemite Corporation has developeda broad line of equipment and application techniques tolubricate all kinds of machine elements, from the tiny, ultra-high-speed parts of dentists’ drills to the huge gears andbearings of steel rolling mills. With modern demands formore and more complex machines running at higher andhigher speeds, and for greater reliability and economy, thelist of applications for Alemite Oil Mist Systems grows longerand longer.

What it doesOil Mist lubrication is an automatic, centralized system thatCONTINUOUSLY delivers fresh, clean oil to multiple, andoften widespread, machine elements. There are numerousadvantages to Oil Mist, in addition to the improvements insafety, productivity, housekeeping, and lubrication that areachieved by automatic centralized systems in general.

Continuous delivery, at rates closely approximating actualbearing-surface needs, eliminates the overlubrication that isnecessary to insure adequate supply between periodicapplications. LUBRICANT CONSUMPTION can often bereduced by as much as 80%.

In many cases, continuous lubricant delivery by Oil Mistpermits elimination of energy-wasting oil sumps. Reductionsin POWER consumption of more than 25% are common.BEARING TEMPERATURES are often lowered dramatically,not by actual cooling, but because most of the powerconsumption reduction represents heat that is not generatedin churning excess lubricant.

Pressurization of housings, with continuous outward air flow,extends MACHINE LIFE by helping to exclude dirt andcorrosive atmospheres. Oil Mist is even used to protectequipment on standby and in storage.

How it does itThe heart of the system is the mist generator. Air fromnormal factory air supply passes over a venturi inside thegenerator, which accelerates the flow. This creates lowpressure and high velocity at the venturi discharge. As airpasses through the venturi it draws oil from the generatorreservoir into the high velocity air stream. The combinationof low pressure and high impact explodes the oil into tiny

particles. This mist is then thrust against a baffle that collectsand drops larger particles back into the reservoir. Thelighter, airborne particles are then carried by the air streamthrough the distribution system to the various points ofapplication.

The efficiency of an Oil Mist System is dependent uponvarious designed lubrication fittings that serve as contactpoints to the parts to be lubricated. These fittings serve twofunctions. They maintain balanced pressure in the systempreventing over or under lubrication of a bearing. Theyregulate the amount of mist through the fitting orifices into thebearings being lubricated.

How to apply itBASIC STEPS TO DESIGN AN ALEMITE

OIL MIST SYSTEM

1. DESCRIBE each element to be lubricated andCALCULATE its Oil Mist flow requirement in CUBIC FEETPER MINUTE (CFM).

2. Select APPLICATION FITTING TYPES and determinetheir PLACEMENT and VENTING provisions.

3. Select the DESIGN MANIFOLD PRESSURE (DMP).

4. Determine FITTINGS SIZES.

5. Select an appropriate Oil Mist GENERATOR.

6. ROUTE and SIZE air and mist distribution PIPING.

7. Select FITTNGS CONFIGURATIONS that will be mostconvenient to install and connect to distribution system.

8. Select ACCESSORIES.

9. Plan ELECTRICAL CIRCUITRY.

Oil Mist Application 1

Details of basic steps -

General:For all Systems

1. The DESCRIPTIONS required to CALCULATE the mistrequirements of machine elements include type of element,dimensions, and various details of installation andoperation. This information is used in simple formulas tocalculate cfm of mist required. The formulas are based onthe design standard oil/air ratio of 0.4 cubic inch (0.22ounce) per hour per cfm. They assume that the elementsto be lubricated were properly selected for the intendedservice and properly assembled and protected fromcontamination. They also assume the use of an oil with theproper misting and lubricating qualities for the intendedapplication. (FORMULAS and other considerations forapplying Oil Mist to SPECIFIC TYPES OF MACHINEELEMENTS are given in a later part of this manual:PAGES 6-10.)

2.APPLICATION FITTING TYPESFITTING SELECTIONS are primarily based on the types ofelements to be lubricated, but are often influenced by otherfactors, such as machine configuration or speed. Ingeneral, use SPRAY FITTINGS and SPRAY NOZZLES forROLLING MOTION elements, such as anti-frictionbearings, gears and chains. (SPRAY NOZZLES are justmultiples of the largest Alemite spray fitting.)CONDENSING FITTINGS or SPRAY FITTINGS are usedfor SLIDING MOTION elements, such as plain bearings,slides, and ways. MIST FITTINGS are used only for rollingelement bearings operating in closed housings, underparticular types of loading, and above a minimum speed.

FITTINGS PLACEMENTPLACE SPRAY FITTINGS to discharge close to thelubricated elements, preferably less than one inch away.

REMOTE POSITIONING of spray fittings is permissible iftheir outputs are ducted to and flow through the lubricatedelements because of relative positions of fittings and vents,and if passages downstream from the fittings are horizontalor sloped downward toward the elements.

TO SPRAY DIRECTLY on elements moving at speeds upto about 1600 linear feet per minute, keep spacing betweenspray fittings and moving surfaces under 1/20 inch per inchwater column manifold pressure. At higher speeds, installspray fittings 1/8 to 1/4 inch from the moving surfaces anduse higher mist pressures-40 in. H20 above 2000 lfm andup to 80 in. H20 at much higher speeds.

From CONDENSING FITTINGS the oil flows by gravitydirectly to the grooves supplying the sliding surfaces. Thefitting location should be as close to the grooves aspossible.

MIST FITTINGS may be installed in any location, providingthe mist flow envelops or passes through the elements tobe lubricated.

FITTING DISCHARGE DIRECTION

SPRAY and CONDENSING FITTINGS work most efficientlywhen discharging downward. However, discharge may be inany direction BETWEEN DOWNWARD AND HORIZONTAL.

SPRAY FITTINGS may also be installed to dischargeUPWARD, in which case the CALCULATED CFM used toselect fittings sizes should be DOUBLED.

Spray discharge should be approximately perpendicular tothe direction of motion of the sprayed surface.

MIST FITTINGS may be installed to discharge in anydirection.

VENTING

VENTING must be provided for the escape of carrier air fromclosed housings.

MINIMUM VENT AREA is equal to twice the total flow area ofthe application fittings supplying flow to that vent. Vent areasof this size will produce housing back pressures equal toabout 20% of manifold pressure.

Wherever possible, relative POSITIONS of VENTS,APPLICATION FITTINGS, and LUBRICATED ELEMENTSshould produce forced flow from application fittings tolubricated surfaces.

VENTING can be by means of approximately locatedDRILLED HOLES or, frequently, by existing ports in thehousing. LABYRINTH SEALS will usually provide adequateventing, although a small one might have insufficientclearances for this purpose, and require the addition of adrilled hole. CONTACT SEALS can be notched to provideventing, but this is not recommended because of thelikelihood that notching will not be provided when seals arereplaced.

VENT PORTS can often serve as OIL OVERFLOW ORDRAIN ports. In an oil-sump application the vent can beplaced just above the normal sump oil level to provide anoverflow path for any excess oil delivered by the Oil Mistsystem. Such vents should be located so that liquid oil willnot splash out through the port. For a dry-sump applicationthe vent can be placed at the bottom of the housing to drainall liquids.

VENTS should generally be PROTECTED from outsidecontaminants. Holes in the sides of housings should slopedownward to the outside. Vent ports in the tops of housingsshould have shielded vent fittings installed.

3. DESIGN MANIFOLD PRESSURE (DMP) is the pressuredrop across the application fittings at which the fittings sizesare selected. It is the intended output pressure of the Oil Mistgenerator. The ALEMITE STANDARD DMP IS 20 INCHESWATER COLUMN. Occasionally, other pressures arerecommended to better meet specific applicationrequirements. In general, lower DMP’s permit closer oiloutput control. Higher DMP’s are used to produce higheroutput velocities from spray type application fittings topenetrate air barriers around high-surface speed elements(over 2000 linear feet per minute). Also, spray andcondensing fittings operate more efficiently with higherpressure drops across them.

Oil Mist Application2

4. Determine APPLICATION FITTING SIZES from the charton PAGE 28.

A. In the TYPE column, locate the fitting type selectedin Step 2.

B. In the section for that fitting type, go to the right tothe column under the DMP selected in Step 3.

C. In the PRESSURE DROP column and type sectionfind the mist flow equal to or nearest to and higherthan the requirement calculated in Step 1.

D. On that flow line, go to the left to the secondcolumn, headed “NO.”, and read the “DASHNUMBER” that represents the fitting size.

E. The columns at the right side of the chart give theminimum vent size for each fitting size. Actually,the sizes given are those of standard drill bitsclosest to calculated sizes and rounded to nearestthousandth.

AN EXCEPTION to the above method of determining fittingtype, size and placement is for elements in a closedhousing that are lubricated from an oil sump by dipping intothe oil or by oil rings, flingers, etc. Gear boxes and pumpbearing housings are examples of such equipment to whichOil Mist is often applied to provide purging and to make upoil losses from the sump. In the Hydrocarbon ProcessingIndustries, this is referred to as PURGE-MIST application.

Since, in a Purge-Mist application, the Oil Mist system doesnot actually lubricate the machine elements, and, sincesump losses cannot be calculated, there are nocalculations to determine application fitting size. Alemiterecommends simply starting with a -8 SPRAY FITTING (or-1 spray nozzle) for each housing, and changing sizes asindicated by housing oil levels and/or overflow rates. A 1/8inch diameter hole at the top of the sump oil level can actas VENT and as overflow to prevent raising sump level.

If a CONSTANT LEVEL OILER is used to control sump oillevel, it must be modified by drilling an approximately 3/16inch diameter hole in the side of the surge chamber about1/4 inch above the operating oil level. This is to provide anoverflow for any excess oil delivered by the mist system.To prevent depressing of the sump oil level, the housingmust be VENTED to an internal pressure no greater than1/10 inch water column. An Alemite 385608 vent fitting isrecommended to accomplish this.

5. Oil Mist GENERATOR selection is based on flow capacityand air heater requirements and, in some cases, ondesired reservoir refill interval.

The required MIST GENERATING CAPACITY isdetermined by adding together the flow ratings, at designmanifold pressure, of all of the APPLICATION FITTINGSthat are to be supplied from the mist generator. Select agenerator (see PAGES 11-12 ) for which this total is withinthe operating range, preferably near the center of thatrange. DO NOT plan to operate a system outside thespecified flow limits of the mist generator, especially at thelow end. Flows less than the minimum specified for agenerator will not reliably draw an adequate supply of oil

from the reservoir to the mist generating head. If it isnecessary to use a mist generator with a higher minimumflow rating than the total of the flow ratings of theapplication fittings, then that total must be increased. Thiscan be accomplished by using the same fittings at a higherdesign manifold pressure or by using fittings with higherflow ratings. In most cases, the greater lubricant deliverywill not even be noticeable. However, if this approach isobjectionable, application fittings can be added to thesystem, either by lubricating points not included in theoriginal plan, or by discharging spray or condensing fittingsinto a vented receptacle.

Requirements for HEATERS are determined by referring tothe chart on PAGE 13. Use of the chart is explained onthat page. The lowest two curves indicate whether oil(reservoir) and air heaters are REQUIRED. (Even thoughthey might not be required, these heaters are often used tostabilize the oil/air ratio with widely varying ambienttemperatures.)

The two curves pertaining to application fittings indicatelimits necessitated by the tendency of oils to coat the boresor passages of those fittings. As temperature falls, thecoating thickens. At FITTING TEMPERATURES above thelimits, the system maintains good balance and output by arise in manifold pressure, since, for a given input pressure,the mist generator tends to act as a CONSTANT FLOWdevice. However, at temperatures below the limits, therestrictions become too great for the system to maintaingood distribution balance. Systems that are to operateunder such conditions should utilize mist generators withThermo-Aire. The temperature of the application fittingscan then usually be kept above the critical levels byinsulating the mist distribution system. Occasionally, itmight be necessary to provide some HEATING for theFITTINGS.

If RESERVOIR REFILL INTERVAL is a matter of concern,consult the chart on PAGE 14. The 0.6 cubic inches of oilper hour per CFM of mist is the approximate maximumoil/air ratio for Alemite Oil Mist generators operating withoutheaters at normal plant ambient temperatures. Oil/air ratiois a function of the setting of the oil flow adjustment screwin the mist generating head, the type and viscosity of oilused, as well as the air and oil temperatures. If all of thesewere acting to maximize the oil/air ratio, the required refillintervals could be as short as about one-half of those givenon the chart. With all factors combining to minimize oil/airratio, the intervals could be lengthened to five or six timesthose shown. However, REMEMBER that changing oil/airratio also changes lubricant delivery. Reducing the ratio toits minimum means reducing lubrication to about one-fourthof the amount the system was designed to deliver, andadds the danger of a complete loss of lubrication due to asmall drop in oil and/or air temperature, or to slightlydifferent misting characteristics of a new supply of oil. Allof which means: DO NOT plan to adjust system operatingconditions to achieve a desired refill interval. To the extentpossible, select a mist generator that will fit into the desiredschedule and, if necessary, adjust the schedule or considerusing an automatic refill system.


6. PIPING refers to the systems used to supply air to the OilMist generator and to distribute the Oil Mist from thegenerator to the application fittings. It includes piping,tubing, hose, and connectors.

In GENERAL, air and mist piping should be free of dirt,scale, or other contaminants. Internal diameters should beof sufficient size to avoid excessive pressure drop.Materials should be compatible with internal fluids, andresistant to external abuse, chemical attack and ambienttemperature.

For AIR PIPING, galvanized or copper pipe; copper,stainless steel or anodized aluminum tubing; rubber hoseor synthetic tubing are recommended. The TABLE at theTOP of the PAGE 15 gives pressure drops, at various airflows, through 100 feet of pipe.

The plant main supply pipe must be larger than the branchsupplying air to the Oil Mist generator. The plant supplypipe pressure, at the inlet to the branch, must be at leastequal to the sum of the generator regulated air pressureand the pressure drop through the branch and the airaccessories, such as air solenoid valve, water separator,and air pressure regulator. If the strainers in the waterseparator and the air regulator become clogged, thepressure drop will increase.

For MIST PIPING, any manifold material meeting theGENERAL requirements above can be used. Black pipeand plain steel tubing can be used if protected fromexternal corrosion by paint. The bore of black pipe shouldbe coated with preservative oil to prevent corrosion prior tothe introduction of Oil Mist. Mist piping should permit mistflow with minimum “wetting out” of oil, and provide fordrainage of any oil that is deposited, without creatingobstructions to the mist flow. Since the mist systemoperates at very low pressure, the use of pipe dope orother thread sealants is not necessary and notrecommended. Improperly used, these sealants cancontaminate the mist piping. Flushing of the manifold isrecommended during installation to eliminate scale and dirtwhich can plug the small bores of the application fittings.

MIST PIPING SIZES are selected primarily to limit mistflow velocity. The TABLE at the BOTTOM of PAGE 15shows the CFM that a given pipe, tube, or hose sizecarries at various flow velocities. The MAXIMUMVELOCITY of mist in the distribution system should be 24fps (feet per second). Higher velocities will causeexcessive wetting out of oil from the mist. The GENERALRECOMMENDATION is to select distribution piping sizesto limit flow velocity to 18-20 fps. This will keep wetting outof oil to an acceptable minimum and will permit someincrease in system flow, if required, without exceeding themaximum rate. For ROLLING MILL application, 15 fpsshould be the maximum flow velocity. For systemsdesigned to operate at manifold pressures between 16inches and 6 inches water column, use 12 fps as designvelocity. The use of OVERSIZE mist lines isPERMISSIBLE but UNDERSIZE piping should NOT BEUSED.

In some installations, drain lines are provided to carry

reclassified oil away from housings. If such lines are alsoacting as vents, they should follow the same criteria asmist distribution piping, regarding flow velocity andavoidance of traps.

In ROUTING MIST PIPING, the main consideration isAVOIDANCE OF TRAPS - low spots in which oil couldcollect. All parts of the distribution systems MUST DRAINby gravity. The main manifold should be sloped downwardtoward the Oil Mist generator wherever possible. It isespecially important to slope the first part of the mainmanifold toward the generator for a distance equal to 300times the pipe ID, since most of the oil wetting-out occurswithin that distance. The TABLE at the TOP of PAGE 16shows the RECOMMENDED SLOPE of manifold for properdrainage back toward the generator.

Branch lines, if sloped toward the main manifold, should beconnected to the top or sides of the manifold, to avoid liquidoil traps.

Where drainage provisions allow liquid oil and mist to flowin the same direction, horizontal runs do not require anyslope. Horizontal runs which are not sloped should havedrainage points not farther apart than 300 times themanifold ID. The drainage may be to points of lubrication,or to a standpipe or sump having provision for periodicdumping of collected oil.

Where oil traps are unavoidable, a 3/64 inch diameter holeor a -3 spray fitting should be provided at the lowest pointof the trap to drain oil. If dripping is objectionable, run adrain tube to a suitable receptable, vented with a 1/16 inchdiameter hole.

7. Select APPLICATION FITTINGS CONFIGURATIONSthat will be most convenient to install. Refer to types andsizes previously determined (Step 4), and select fromfittings described on PAGES 17-21, and in Oil MistCatalog.

The complete fitting part number consists of a six-digitnumber, designating type and style, followed by the “dashnumber”, indicating size.

8. ACCESSORIES

The basic Oil Mist system components are:

a. An air line filter/water separator to assure a clean airsupply to the Oil Mist generator. (INCLUDED with somemodels of Alemite Oil Mist generators, purchasedseparately for others).

b. An air pressure regulator to control the atomizing airpressure to the generator - the BASIC SYSTEMADJUSTMENT. (INCLUDED with some models ofAlemite Oil Mist generators, purchased separately forothers).

c. An Oil Mist generator which includes a venturi nozzle, oillife tube, reservoir, and oil flow adjusting screw.

d. Mist distribution system to convey the Oil Mist to theapplication fittings.


e. Mist, spray or condensing application fittings to meterand reclassify the Oil Mist at each lubrication point.

ACCESSORY Oil Mist system components include:

a. An air supply on-off valve. A solenoid valve is often usedand is INCLUDED with some models of Alemite Oil Mistgenerators. The use of a solenoid valve permits remotecontrol or the interlocking of mist system operation withthat of the lubricated machine.

b. An oil heater to maintain the oil in the generator reservoirat the proper viscosity for good mist generation(INCLUDED with all generators supplied with air heaterand with some sales models of most other generators.)

c. An air heater (“Thermo-Aire”) to stabilize oil/air ratio, atvarying ambient temperature, or to mist heavy oils whichwill not properly atomize at the prevailing ambienttemperature.

INCLUDED with some sales models of all generators forwhich available. NOT AVAILABLE for 12 ounce or onegallon generators).

d. An oil level switch to signal low oil level in the reservoirand/or to control automatic reservoir refill.

e. A mist manifold pressure gauge (manometer) for visualindication of manifold pressure. Although not necessaryfor system operation, it is STRONGLY RECOMMENDEDthat a mist pressure gauge be included in every Oil Mist

system. It simplifies and improves the accuracy ofsystem adjustment and provides valuable information onsystem operation, especially during start-up and if troubleshooting is required.

f. A mist manifold pressure switch to signal high or lowmanifold pressure. SHOULD BE INCLUDED INTHERMO-AIRE SYSTEMS, wired to shut off air heaterunder alarm conditions, to protect heater element. Seecircuit diagrams in section 9.

g. An Oil Mist detection unit (“Mist Monitor”) to signal highor low density of oil particles in the mist. With reservoiroil level, manifold pressure, and air temperature all withinnormal limits, it is still possible that a mist generator willnot produce mist, due to improper oil in the reservoir orto blockage of oil flow to the mist head. The Mist Monitorcontinuously monitors mist density, photoelectrically, andsignals any serious deviation from the calibration level.

9. Some suggested ELECTRICAL CIRCUITS are shown onPAGES 23-26. Terminal or wire numbers for electricalcomponents are given on PAGE 22. Of course, the usermay use these components as desired, within their ratings.

NOTE that circuits involving Thermo-Aire (air heaters)interlockthe heater with the mist pressure switch. This is to protect theheater by preventing application of power without air flowthrough the unit.


Applying Oil Mist to specific

types of machine elements

ROLLING ELEMENT BEARINGS

MODERATE SERVICECFM = 2x1/40=0.05

CFM CALCULATIONS

Moderate Service cfm=DR/40

Heavy Service cfm=DR/20

Rolling Mill Service cfm=DR/14

Where D = Shaft diameter in inches

R = Number of rows of rolling elements

The HEAVY SERVICE formula is used for:

All constantly thrust loaded bearings.

All preloaded bearings

All bearings on shafts transmitting more than 40 horsepower.

All bearings subjected to high inertial loads, either byfrequent hard starting and stopping or by unbalanced shaftdesigns.

The ROLLING MILL SERVICE formula is used for work roll andbackup roll bearings in ferrous and non-ferrous rolling mills.

MODERATE SERVICE is any not included in the other servicedefinitions.

SPRAY FITTINGS OR NOZZLES are preferred for rollingelement bearings.

MIST FITTINGS are used for moderate service rolling elementbearings in closed housings where it is not practical to place aspray fitting close to each bearing. Because most of the outputof a mist fitting will remain air-borne until carried into theturbulent region of a bearing, mist fittings can be installedremotely from the bearings they are to lubricate. Severalbearings in a housing can be served by one mist fitting. Toutilize the output from mist fittings, bearings must be operatingat speeds no lower than 200 linear feet per minute andpreferably above 1000 lfm, at the mean diameter of the bearing.VENTS must be positioned and sized to proportion positive mistflow through each bearing.

AN EXCEPTION to the forced flow principle of inlet and vent

location is used advantageously on single row, moderateservice, ball bearings on shafts under four inches in diameter,operating over 200 lfm. Bearings in this category, mounted inthe wall of a machine housing containing a mist atmosphere,can be mist lubricated if BOTH SIDES of the bearing are freelyexposed to the mist. A drilled hole or undercut with a minimumarea of 0.049 square inches in the outer race support is used toexpose the outboard side of a bearing in a blind wall mountingto the mist in the housing. The windage created by the rotatingparts of the bearing assembly will create sufficient flow of mistthrough the rolling elements. The cfm requirement for eachsuch bearing should be included in the calculated mist input forthe housing.

For radially mounted bearings designed to carry THRUSTLOADS (Heavy Service), such as angular contact ball ortapered roller bearings, spray fittings and vents should belocated so the flow through the bearing is opposite to thedirection of thrust from the shaft. This is not necessary if an oilsump or bath is maintained.

TAPERED ROLLER BEARINGS, operating with light preloads,are best lubricated from the small end of the rollers. OnHEAVILY PRELOADED tapered roller bearings, two sprayfittings per row can be used to advantage, especially in criticalapplications such as precision machine tool spindles. For theseinstallations use the HEAVY SERVICE or even the MILLSERVICE formula. On the upstream side of the bearing use aspray fitting sized to deliver about one-third of the calculatedrequirement, and on the vent side use a spray fitting that willdeliver about two-thirds of the calculated value. On the ventside, place the fitting as close as possible to the bearing and tryto direct its output toward the bearing and away from the vent.

VENTS and APPLICATION FITTINGS should generally belocated so the calculated cfm for each row of rolling elements inHEAVY SERVICE flows through that row before exhaustingthrough the vent. For bearings in MODERATE SERVICE, suchforced flow can be through two consecutive rows, if necessary.With the EXCEPTION noted previously, forced flow throughbearings is necessary when using mist fittings. In direct sprayapplications, with spray fittings discharging close to lubricatedelements, the vents and fittings need not be on opposite sidesof the bearings.

OIL SUMPS are recommended for ALL HEAVY SERVICEBEARINGS and for all moderate service bearings mounted onshafts four inches or larger in diameter. A DEPTH of oilsufficient to cover the inside diameter of the bearing cup isrecommended for tapered roller bearings. For other bearingtypes the depth of oil should be to the mid-height of the rollingelement at the bottom of the bearing. Vent locations can beused to maintain the proper oil level. For high speed bearings,vents used to control the sump level should be located so thechurning effect of the rolling elements does not throw sump oilout of the vent ports.

Bearing housings with DOUBLE LIP SEALS require spray inletsand vents located to maintain an oil sump in the area betweenthe contacting lips. The CFM seal requirement is equal to arow of elements on the same shaft in moderate service(cfm=D/40).

Means of sighting sump oil level are recommended.



PLAIN BEARINGS

CFM CALCULATIONS

Moderate Service cfm=LD/100

Heavy Service cfm=LD/60

Heavy Service, High Loss cfm=LD/30

Where D = Shaft Diameter in Inches

L = Sleeve Length in Inches

MODERATE SERVICE BEARINGS are:

Rotating bearings on horizontal shafts where the load zoneis always in the lower half of the bearing.

Bearings mounted in any position where the oil is retainedin the bearing by contact type seals.

Bearings with porous bushings or synthetic “frictionless”sleeves.

HEAVY SERVICE BEARINGS are:

Oscillating bearings on horizontal shafts where the loadzone is always in the lower half of the bearing.

Unsealed bearings subjected to shock loading where theload zone constantly shifts, but boundary lubrication ispermissible, such as king pins and spring pins on trucks.Small rotating bearings not mounted on horizontal shafts.

HEAVY SERVICE, HIGH OIL LOSS BEARINGS are:

Rotating bearings or bearings oscillating rapidly where theload zone shifts more than 180°, such as crankshaft andcrankarm bearings. Applications where these bearingsoperate over 600 lfm should be referred to the factory.

Large bearings without seals that are not mounted onhorizontal shafts.

CONDENSING OR SPRAY FITTINGS are recommended forplain bearings with 360° sleeves. SPRAY FITTINGS arerecommended for half-sleeve bearings.

On 360° bearings, fittings are installed so their outlets areabove the bearing housing. On HALF BEARINGS, sprayfittings are installed to spray on the shaft near its line of entryinto the bearing.

The following general RULES FOR GROOVE LOCATIONSin Oil Mist lubrication bearings are consistent with acceptedgrooving practice for oil lubricated plain bearings, regardlessof the method of oil application:

A. Grooves should be located so that 90% of the surfacearea of the ungrooved surface (usually the shaft) passesover one oil groove during each cycle of motion. Thisrule is best represented by a longitudinal grooveextending 90% of the sleeve length in a rotating bearing.Following this rule, OSCILLATING BEARINGS mayrequire several longitudinal grooves. In small oscillatingbearings these primary grooves can be connected by a

circumferential secondary groove with a singleapplication fitting supplying all grooves. On largebearings of this type, a fitting should be used for eachlongitudinal groove.

B. Groove volumes should be kept to a minimum. With aconstant source of lubricant input, large volume grooves,acting as reservoirs, are not required. Large volumegrooves can be a disadvantage on machine start-up, ifoil has completely drained from the groove volumeduring a shutdown period. For this reason, applicationfittings should not be spaced further than FIVE INCHESapart in bearings over five inches long.

C. All groove edges or housing parting line edges facingthe oncoming sliding surface should be rounded orchamfered to prevent scraping the oil from the shaft.

D. Grooves should be in the unloaded zone ofhydrodynamically lubricated bearings. On largebearings of this type the groove should be close to thearea where the shaft enters the load zone.

The RULES FOR VENTING plain bearings are:

A. Grooves are also used to vent plain bearings. For thispurpose, longitudinal grooves should extend to within1/4” from the end of the sleeve in horizontal bearings.Circumferential grooves in vertical sleeves should be inthe upper third of the sleeve and a longitudinal grooveextending upward from this groove to the END of thesleeve is preferred for venting and should be oppositethe application fitting inlet.

B. Bearings with very close tolerances or with contact sealsrequire a vent passage connected to the top of theinternal grooving. The inlet and vent passages may becombined.

SLIDES AND WAYS

CFM CALCULATIONS

Application fittings installed in SLIDE:cfm=A/800

Application fittings discharging ONTO WAYS:cfm=A/400

Where A = TOTAL contact area in square inches

Generally, CONDENSING FITTINGS are used to deliverlubricant through holes in slides. SPRAY FITTINGS areused to supply oil to ways.

For SLIDES, provide at least one application fitting for eachsix inches of slide width and four inches of slide length, orfractions thereof. Thus, a slide seven inches wide by nineinches long should carry six application fittings - two acrossby three lengthwise. Fittings should discharge intoTRANSVERSE GROOVES extending 90% of slide width.Grooves should be VENTED or inlets and vents may becombined as illustrated for plain bearings.

For WAYS, provide at least one application fitting for each sixinches of contact width.

Where MULTIPLE FITTINGS are used, DIVIDE thecalculated CFM EQUALLY among them.



GEARS

CFM CALCULATIONSSpur, bevel, helical, etc:

unidirectional cfm = F(D1 + D2 + D3 +...)/160reversing cfm = F(D1 + D2 + D3 +...)/110

Worm gears, unidirectional cfm = F(2D1 + D2)/160reversing cfm = F(2D1 + D2)/110

Where F = Gear face width, in inchesD1 = Pitch diameter of small gear or worm, in inches

D2 = Pitch diameter of large gear, in inchesD3, etc = Pitch diameters of additional gears, in

inches

If D2, D3 or any gear is LARGER THAN 2D, (except worm), inplace of that larger gear USE 2D1.

SPRAY FITTINGS OR NOZZLES are used to spray directlyon gears.

Provide a spray fitting for each TWO INCHES OF FACEWIDTH or fraction thereof.

Where MULTIPLE FITTINGS are used across a WIDE GEARFACE, DIVIDE the calculated CFM EQUALLY among them.

For moderately loaded GEAR TRAINS, sprays directed atevery second or third gear in the train will generally suffice.Using the formula, calculate the total cfm requirement for thetrain. Proportion this by “eyeball estimate” to the lubricationpoints selected. Use more or larger fittings on larger gears oron those with more mesh points.

For HEAVILY LOADED GEAR TRAINS, provide sprays forall mesh point, estimating proportioning to determine numberor sizes of fittings.

For UNIDIRECTIONAL operation, direct spray at load side ofgear teeth.

For REVERSING service, direct spray toward gear axis:

CHAINS

CFM CALCULATIONS

ROLLER Chain, power transmitting

SILENT Chain

Where P = Pitch of chain or sprocket, in inchesD = Pitch diameter of small sprocket, in inchesR = Number of rows of chain rollersW = Width of chain in inchesS = rpm of small sprocket

CONVEYOR Chain

Where D = Diameter of drive sprocket, in inchesW = Width of chain, in inchesL = Length of chain, in inches

SPRAY FITTINGS are used for chain lubrication.

For ROLLER and CONVEYOR chains, direct spray ontoedges of link plates. For single strand roller and for conveyorchains, apply about one-half of the calculated cfm to eachrow of link plates.

For MULTIPLE STRAND roller chain, divide the calculatedcfm by the number of rows of rollers to find the sprayFITTING SIZE for the inner rows of link plates. For the twoouter rows of link plates, divide calculated cfm by two timesthe number of roller rows.

For SILENT chain, provide one spray fitting for each 1/2 inchof width, starting 1/4 inch from outside edges. To SIZEfittings, divide calculated cfm by twice the chain width.

For best results, position fittings to spray on the INSIDE OFTHE SLACK STRAND.

If spraying the SLACK STRAND, direct the spray slightlyAGAINST the chain motion.

If spraying the WORKING STRAND, point the spray slightlyin the direction of chain motion.


cfm = PDR320

S(100)cfm =

3DW + 0.1LW500

S(100 )

cfm =

WD600

3

3

MIST GENERATOR FLOW CHARACTERISTICS


MIST GENERATOR FLOW CHARACTERISTICS


SELECTION OF Oil Mist GENERATING COMPONENTS

TO OBTAIN OIL/AIR RATIO OF 0.4 CUBIC INCH OIL/HOUR/CFM AIR

The minimum ambient temperature and the oil viscosity for any intended application are used to locate a point on this chart.The location of this point provides information used to determine the Oil Mist equipment requirements for the intendedapplication.

CERTAIN OIL ADDITIVES CAN AFFECT THE OIL/AIR RATIO, OR STOP THE GENERATION OF MIST.

OIL VISCOSITY RATING VS. ESTIMATED MINIMUM AMBIENT TEMPERATURE


RESERVOIR REFILL INTERVAL

The chart relates mist flow and intervals at which various Alemite Oil Mist reservoirs will require refilling.

Curves are based on a mist density of 0.6 cubic inches of oil per hour per cfm of mist.

Curves are labeled with nominal reservoir capacities, but are based on actual usable cubic inches from FULL mark to nozzlestarvation.

Ranges covered by curves are those available with Alemite standard reservoir and mist head combinations.



AIR PIPING

1/8” 1/4” 3/8” 1/2” 3/4”.269”I.D. .364”I.D. .493” I.D. .622” I.D. .824” I.D.

2 2

4 5 1

7 16 3 1

15 13 3 1

20 23 5 2

35 14 4 1

45 23 7 2

100 33 8

PIPE SIZE

PRESSURE DROP PER 100 FEET OF PIPE-psiAIR FLOW@100psi

@75F(cfm)

MIST PIPE SIZING

MIST FLOW–SCFM

SIZE ID-in AREA-in2 @12fps @15 fps @18fps @20fps @24fps

1/4 tube 0.194 0.030 0.148 0.185 0.222 0.246 0.2963/8 tube 0.305 0.073 0.365 0.457 0.548 0.609 0.7311/2 tube 0.444 0.155 0.774 0.968 1.161 1.290 1.548

1/8 pipe 0.269 0.057 0.284 0.355 0.426 0.474 0.5681/4 pipe 0.364 0.104 0.520 0.650 0.780 0.867 1.041 3/8 pipe 0.493 0.191 0.954 1.193 1.432 1.591 1.909

1/2 pipe 0.622 0.304 1.519 1.899 2.279 2.532 3.0393/4 pipe 0.824 0.533 2.666 3.333 3.999 4.444 5.3331 pipe 1.049 0.864 4.321 5.402 6.481 7.202 8.643

11/4 pipe 1.380 1.496 7.479 9.349 11.218 12.464 14.95711/2 pipe 1.610 2.036 10.179 12.725 15.267 16.965 20.358

2 pipe 2.067 3.356 16.778 20.974 25.165 27.963 33.556

21/2 pipe 2.469 4.788 23.939 29.925 35.905 39.898 47.8783 pipe 3.068 7.393 36.963 46.207 55.440 61.601 73.927

3/16 hose 0.188 0.028 0.138 0.174 0.207 0.231 0.2761/4 hose 0.250 0.049 0.245 0.307 0.368 0.409 0.491 3/8 hose 0.375 0.110 0.552 0.690 0.828 0.920 1.104

1/2 hose 0.500 0.196 0.982 1.227 1.473 1.636 1.9643/4 hose 0.750 0.442 2.209 2.761 3.313 3.682 4.4181 hose 1.000 0.785 3.927 4.909 5.890 6.545 7.854

11/4hose 1.250 1.227 6.136 7.670 9.204 10.227 12.27211/2hose 1.500 1.767 8.836 11.045 13.254 14.726 17.672

Table Notes:

1. Table is for manifold where condensed oil flow is opposite the mist flow.

2. Table is for installations in continuous operation. For systems operating one or two shifts daily, divide slope in Table by 2.


SLOPE OF MIST MANIFOLD TOWARD GENERATOR

OIL VISCOSITY MINIMUM AMBIENT OR MANIFOLD TEMPERATURE(SSU@100F) 0F 32F 50F 75F 100F

100 5.3 3.7 3.0 2.4 2.1

180 8.8 5.4 4.1 3.0 2.5

300 10.5 6.1 4.6 3.7 2.9

500 12.2 7.2 5.5 4.4 3.5

800 18.0 8.5 6.5 5.1 4.0

1500 – 11.0 8.8 6.1 4.9

2500 – 15.0 10.4 7.1 5.4

5000 – – 14.4 9.0 6.

*PERCENT SLOPE OF MANIFOLD

*2% slope equals 2” drop every 100” of manifold

MIST APPLICATION FITTINGSMist fittings are metering orifices which deliver mist, with minimum condensation, to machine elements.The mist must be converted to liquid oil by the machine element.The fittings are made of brass. Color - black.The air flow graph shows average output.


†–INLET 1/8 NPTF (FEMALE) †–INLET 1/4 OD TUBE FTG ORIFICE

OUTLET OUTLET OUTLET DIAMETER LENGTH FLOW1/8 PTF* (m) 1/4 NPTF (m) 1/8 PTF* (m) AREA

380791-2 381290-2 .032 .44 .00078380791-4 381303-4 381290-4 .045 .44 .00159380791-6 381303-6 381290-6 .055 .44 .00237

381303-10 381290-10 .078 .44 .00484381303-16 381290-16 .089 .44 .00622

*SAE Special Short.†–PREFERRED ARRANGEMENT. INLET AND OUTLET CAN BE INTERCHANGED WHERE NECESSARY.

†PART NO. INCLUDES:

381289-2,-4,-6,-10, OR -16 FTG

328301-4 COMP. NUT

328302-4 COMP. SLEEVE

CONDENSING APPLICATION FITTINGS

Condensing fittings are metering elements which convert mist to liquid oil within the fitting. The condensed oil flows by gravity tothe machine element.The fittings are made of brass. Color - silver.The air flow graph shows average output.


INLET 1/8 NPTF (f) †–INLET 1/4 OD TUBE FTG ORIFICE (BAFFLED)OUTLET 1/8 PTF * (m) OUTLET 1/8 PTF *(m) SIZE LENGTH FLOW AREA

381281-06 SLOT .014 R .38 .0003381281-1 381282-1 SLOT .020 R .38 .0006381281-2 381282-2 2 SLOTS .020 R .38 .0012381281-3 381282-3 3 SLOTS .020 R .38 .0018381281-4 381282-4 5 SLOTS .020 R .38 .0030381281-5 381282-5 6 SLOTS .020 R .38 .0036

*SAE Special Short.†–PREFERRED ARRANGEMENT.INLET AND OUTLET CAN BE INTERCHANGED WHERE NECESSARY.

SPRAY APPLICATION FITTINGS

Spray fittings are metering orifices which convert a high percentage of mist to an oil spray.

The fittings are made of brass. Color - olive drab.

The air flow graph shows average output.


INLET 1/8 NPTF INLET 1/4 OD TUBE FTG ORIFICEOUTLET 1/8 NPTF OUTLET 1/8 NPTF DIAMETER LENGTH FLOW AREA

381283-1 381288-1 .024 1.38 .000452381283-2 381288-2 .035 1.38 .000962381283-3 381288-3 .042 1.38 .00138381283-5 381288-5 .055 1.38 .00237381283-8 381288-8 .067 1.38 .00352

SPRAY NOZZLE APPLICATION FITTINGS

Spray nozzles contain one or more metering orifices which convert a high percentage of mist to an oil spray. The capacity ofeach metering orifice is nearly equal to that of one -8 spray fitting.

The nozzles are made of brass.


ONE END THREADED BOTH ENDS THREADED

1/2 NPTF (m) 3/4 NPTF (m) 1/4 NPTF (m) 1/2 PTF*(m)

326370-1 383588-1 384280-1 1 .00352

326370-2 383588-2 384280-2 2 .00704

326370-3 383588-3 384280-3 3 .01056

326370-4 383588-4 384280-4 4 .01408

326370-5 383588-5 384280-5 5 .01760

326370-6 383588-6 384280-6 6 .02112

326370-7 383588-7 384280-7 7 .02464

326370-8 384280-8 8 .02816

326370-9 384280-9 9 .03168

32670-10 383617-10 384280-10 10 .03520

383617-11 11 .03872

383617-12 12 .04224

383617-13 13 .04576

383617-14 14 .04928

*SAE Short

TOTALFLOW AREA SQ. IN.

NO. OF ORIFICES.067 DIA.1.38 LG.

SPRAY NOZZLE APPLICATION FITTINGS

(continued)

Dash number for each curve indicates number of .067 diameter orifices in nozzle and is used as suffix of nozzle part number.

The flow through one .067 diameter orifice is .56 cfm at a pressure drop of 60 inches water column, and .68 cfm at 80 incheswater column.

The nozzle air flow graph shows average output.


BASIC OIL MIST GENERATOR ELECTRICAL INTERCONNECTION DIAGRAM

TABLE OF COMPONENTS

CODE COMPONENT

SOL A SOLENOID AIR SHUT-OFF VALVE

TS-2 OIL HEATER THERMOSTAT

OH OIL HEATER

HPS MIST HIGH PRESSURE SWITCH (NO.2)

LPS MIST LOW PRESSURE SWITCH (NO.1)

LLS LOW LEVEL SWITCH

ON “THERMO-AIRE” GENERATORS ONLY

TS-1 AIR HEATER THERMOSTAT

TS-3 LOW AIR TEMPERATURE SWITCH

AH AIR HEATER

**CAP. CAPACITOR

AUTOMATIC REFILL KIT

RSS REFILL AND SIGNAL SWITCH

SOL R SOLENOID OIL REFILL VALVE

NOTES:

1. This is the interconnection diagram for Oil Mist generators, but most models do not incorporate all the electricalcomponents.

2. Terminal boxes having the same terminal strip numbering are recommended for Modular Design Generators.

3. These terminal numbers are used in the recommended elementary diagrams (in this section) for all Oil Mist Units, eventhough most models do not incorporate all the electrical components.

4. The recommended elementary diagrams in this section are intended to be representative of the majority of desiredhookups. Where feasible, likely alternatives are shown.

5. Some circuits will require removal of jumpers 2-5, 5-6 and/or 9-10.

**High volume Thermo-Aire Generators only.


RECOMMENDED ELEMENTARY WIRING DIAGRAMS FOR OIL MIST SYSTEMSWITHOUT OIL HEATERS

These wiring diagrams are recommended for Oil Mist systems integral with a single machine. CR relay (5) can be used tointerlock machine start and stop with Oil Mist system operation. DS-1(1) can be omitted if machine is equipped with a powerdisconnect.

Sequence of Operation (upper diagram):

1. Manually closing DS-1 (1) energizes the air solenoid (4), allowing air to flow to the Oil Mist generator. Closing DS-1 alsoenergizes the red light (6) and CR(5); therefore, CR contact (2) is open, and machine cannot be started.

2. When sufficient manifold pressure is attained, LPS (5) opens, de-energizing CR and the red light. The machine can now bestarted by closing PB-1.

Function of CR Contacts:

1. With CR contacts in location #1, machine cannot be started without Oil Mist system, and will shut down when there is lowoil level, low manifold pressure, or high manifold pressure.

2. With CR contacts in location #2, machine cannot be started without Oil Mist System, but once machine is started, failure ofthe Oil Mist system will energize red light, but will not shut down the machine.

Sequence of Operation (lower diagram):

1. Manually closing DS-1(1) starts the Oil Mist system simultaneously with the machine, and failure of the Oil Mist System willonly energize the red light (5).


RECOMMENDED ELEMENTARY WIRING DIAGRAMS FOR OIL MIST SYSTEMS WITHOIL HEATERS AND SIGNALS

These wiring diagrams are recommended for Oil Mist systems integral with a single machine. CR relay (3) can be used tointerlock machine start-and-stop with Oil Mist system operation.

An alternate relay CR-2(7) can be wired in series with DS-3, and CR omitted.

Where DS-1(1) is operated just prior to machine start, the oil heater should be wired upstream of DS-1. DS-1 can be omittedif machine is equipped with a power disconnect.

Sequence of Operation (upper diagram):1. Manually closing DS-1(1) energizes the oil heater (2) and the red light(5) indicating power on.2. Manually closing DS-2(8) energizes the air solenoid, allowing air to flow to Oil Mist generator.3. When sufficient manifold pressure is attained, LPS(4) de-energizes the green light (4) and optional relay coil CR(3).4. If CR is used, machine can now be started.

Also, DS-3(6) may now be closed to lock in howler H for annunciation of system fault.

Sequence of Operation (lower diagram):1. In diagram below, WS Light Signal unit 380745 is used in place of the individual red and green lights above.

In case of malfunction, the red light and howler H, if used, will be energized.Sequence of operation is the same, except there is no indication when DS-3 can be closed without energizing the red lightand howler.Also, there is no indication of power-on when DS-1 is closed to energize the oil heater; instead, the green light indicates theair solenoid is energized.


RECOMMENDED ELEMENTARY WIRING DIAGRAMS FOR OIL MIST SYSTEMS WITHAIR AND OIL HEATERS AND SIGNALSThese wiring diagrams are recommended where Oil Mist is lubricating a machine segment of a multiple-machine operation.Malfunction of the Oil Mist system energizes the warning signals, but does not stop the machine.WS alarm signal units are interchangeable in either circuit arrangement.Upper circuit shows air heater on same power input as control circuits.Lower circuit shows air heater on separate power input.Upper circuit can include 2CR relay (4) for interlocking machine start with proper Oil Mist system operation.When 2CR is used, 2CR contacts in start circuit are normally open.Upper circuit, as shown, is for MODULAR SERIES Thermo-Aire generators. For HIGH VOLUME units (2000 watt air heater),replace TS-1 and AH(3)with Heater Control Relay (HCR) coil, and connect TS-1, AH and HCR contacts as shown in lower diagram.

Sequence of Operation (upper diagram):1. Power across the input lines energizes the oil heater (1).2. Manually closing DS-1(2) starts the Oil Mist system.3. When Oil Mist system is stabilized, DS-2(6,8) is closed to lock in WS alarm, (Light Signal 380745), H Howler 380732, andoptional 2CR relay.Sequence of Operation (lower diagram):WS light signals (lamp 60 watts maximum) are shown in place of the alarm circuit shown above, and DS-2 is not required.2CR relay cannot be used in circuit below, unless the WS alarm system shown in upper diagram is used.1. Manually closing DS-1(1,5) starts the Oil Mist system.2. When the Oil Mist system is stabilized, all warning lights are de-energized.


RECOMMENDED WIRING DIAGRAMS FOR OIL MIST SYSTEMS WITH OIL AND AIRHEATERS AND INDIVIDUAL SIGNALSThis wiring diagram is recommended where Oil Mist is lubricating a machine segment of a multiple-machine operation, andneon pilot lights are used (with master warning signals) to indicate the cause of malfunction.Malfunction of the Oil Mist system energizes the warning signals, but does not stop the machine. The circuit shows air heateron a separate power input.The circuit can include 4 CR relay (15) for interlocking machine start with proper Oil Mist system operation. When 4 CR isused, 4 CR contacts in the start circuit are normally open.


TYPICAL OIL-MIST SYSTEM PIPING SCHEMATIC


NOTES ON USE OF APPLICATION FITTING SELECTION CHART1. Basic Design Manifold Pressure is 20 inches water column.2. Minimum recommended vent area equals twice the application fitting orifice area.3. Minimum recommended manifold pressure for mist fittings is 2” H20.4. Minimum recommended manifold pressure for spray fittings is 8” H20.5. Minimum recommended manifold pressure for condensing fittings is 12” H20.6. Design manifold pressure of 40” H20 is recommended for:

a. Direct spray applications over 2000 fpm.b. Applications where the ambient temp. at the fittings is close to the minimum recommended.


TYPE NO. SIZE LENGTH FLOW AREA 2 5 8 12 20 30 40 DIA. AREA- 2 .032 DIA .44 .00078 .018 .033 .047 .030 .079 .095 .110 .047 .00173- 4 .045 DIA .44 .00159 .036 .067 .096 .122 .161 .195 .224 .064 .00322

MIST - 6 .055 DIA .44 .00238 .048 .100 .143 .184 .240 .290 .334 .087 .00477-10 .078 DIA .44 .00478 .100 .210 .295 .380 .495 .615 .715 .111 .00968-16 .089 DIA .44 .00622 .120 .280 .400 .520 .680 .830 .960 .125 .012??-05 SLOT .014R .38 .0003 .013 .018 .024 .029 .028 .00062- 1 SLOT .020R .38 .0006 .031 .042 .055 .065 .040 .00126- 2 2 SLOTS .38 .0012 .062 .083 .109 .131 .055 .00238

CONDENSING - 3 3 SLOTS .38 .0018 ..091 .125 .164 .195 .070 .00385- 4 5 SLOTS .38 .0030 .149 .206 .271 .321 .089 .00622- 5 6 SLOTS .38 .0036 .178 .246 .312 .368 .096 .00724

CONDENSED 6 SLOTS & .38SPRAY - 6 .067 DIA .97 .0036 .132 .185 .236 .277 .096 .00724

- 1 .024 DIA 1.35 .00045 .018 .022 .029 .035 .040 .035 .00096SPRAY - 2 .035 DIA 1.38 .00096 .030 .038 .052 .066 .078 .052 .00212FITTING - 3 .042 DIA 1.38 .00138 .040 .060 .078 .095 .112 .060 .002??

- 5 .055 DIA 1.38 .090 .118 .159 .198 .230 .078 .004??- 8 .067 DIA 1.38 .00353 .180 .230 .300 .370 .420 .096 .00724- 1 .067D(1) 1.38 .00353 .190 .240 .310 .380 .460 .096 .00724- 2 .067D(2) 1.38 .00705 .380 .480 .620 .760 .920 .136 .01453- 3 .067D(3) 1.38 .01058 .570 .720 .930 1.14 1.38 .166 .02164- 4 .067D(4) 1.38 .01410 .760 .960 1.24 1.52 1.84 .191 .02865- 5 .067D(5) 1.38 .01763 .950 1.20 1.55 1.90 2.30 .213 .03563- 6 .067D(6) 1.38 .02115 1.14 1.44 1.86 2.28 2.76 .234 .04301

SPRAY - 7 .067D(7) 1.38 .02468 1.33 1.68 2.17 2.66 3.22 .250 .04909NOZZLE - 8 .067D(8) 1.38 .02820 1.52 1.92 2.48 3.04 3.68 .266 .05557

- 9 .067D(9) 1.38 .03173 1.71 2.16 2.79 3.42 4.14 .290 .06605- 10 .067D(10) 1.38 .03526 1.90 2.40 3.40 3.80 4.60 .302 .0716?- 11 .067D(11) 1.38 .03878 2.09 2.64 3.41 4.18 5.06 .313 .07???- 12 .067D(12) 1.38 .04231 2.28 2.88 3.72 4.56 5.52 .328 .08???- 13 .067G(13) 1.38 .04583 2.47 3.12 4.03 4.94 5.98 .344 .09294-14 .067D(14) 1.38 .04936 2.66 3.36 4.34 5.32 6.44 .358 .10066

MIN. VENTAPPLICATION FITTINGS STANDARD CFMPRESSURE DROP-- INCHES WATER

APPLICATION FITTINGORIFICE

APPLICATION FITTING SELECTION CHART


SUMMARY OF CALCULATIONS FOR CFM INPUTS TO MACHINE ELEMENTS

based on oil/air ratio of 0.4 cubic inch oil/hour/cfm air

ROLLING ELEMENT BEARINGS (ANTI-FRICTION) Spray and mist fittings are used.A. Moderate Service cfm = DR/40 D = shaft diameter in inchesB. Heavy Service cfm = DR/20 R = number of rows of elementsC. Rolling Mill Service cfm = DR/14

PLAIN BEARINGS Condensing and spray fittings are used. A. Moderate Service cfm = LD/100 L = bearing length in inchesB. Heavy Service cfm = LD/60 D = shaft diameter in inchesC. Heavy Service, High Loss cfm = LD/30

Condensing fittings are used. SLIDES AND GIBS cfm = A/800WAYS cfm = A/400 A = maximum contact area in square

inches

Spray fittings are used. GEARS REVERSING GEARS cfm = F(D1 + D2 + D3, etc.)/160 F = gear face width in inches

cfm = F(D1 + D2 + D3, etc.)/110 D1 = pitch diameter of small gear or wormgear inches

WORM GEARS cfm = F(2D1 + D2)/160 D2 = pitch diameter of large gear in inchesREVERSING WORM GEARS cfm = F(2D1 + D2)/110 D3, etc. = pitch diameter of additional gearsIf D2, D3, or any gear is larger than 2D1, in place of the larger gear, use 2D1

Spray fittings are used. ROLLER CHAIN, POWER TRANSMITTING

cfm = PDR (S/100)3 P = pitch of chain or sprocket in inches320 D = pitch dia. of small sprocket in inches

R = number of rows of chain rollers SILENT CHAIN cfm = WD (S/100)3 W = width of chain in inches

600 S = rpm of small sprocket

Spray fittings are used.CONVEYOR CHAIN cfm = 3DW + 0.1 LW D = diameter of drive sprocket in inches

500 W = width of chain in inchesL = length of chain in inches

Spray fittings are used.CAMS cfm = FD/400 F = face width of cam in inches

D = maximum diameter of cam in inches

Spray and mist fittings are used. RECIRCULATING ROLLING ELEMENT NUTS D DR D = pitch diameter of nut(ANTI-FRICTION BALL NUTS) CFM = 30 + 300 R = number of rows of elements

For heavy-duty bearings, with oil sumps, very lightly loaded: cfm = DR/80. Double-lip seals: D = D/40.

NOTES

NOTES

NOTES

Alemite Oil MistualApplication Manual

7845 Little Avenue,Charlotte, NC 28226Phone: 704-542-6900Toll-Free US/Canada: 866-4-AlemiteFax US/Canada: 800-648-3917www.a lem i te .com

02/04

Documents

Alemite Oil Mist Application Manual - CENTRAL-LUBE Oil Mist Application Manual Introduction The Oil Mist principle was developed in the late 1930’s by a European bearing manufacturer