Fan Maintenance Manual

8/12/2019 Fan Maintenance Manual

1/15

1-800-214-7716www.midwestair.com

PO Box 5319281 Hughes DriveTraverse City, MI 49686

Ph:231-941-5865Fax: 231-941-1636

[email protected]

MIDWEST AIR PRODUCTS CO., INC.

FAN-MAN06

DO NOT STORE GRAY PVCFANS IN DIRECT SUNLIGHT

JOB NO:

CUSTOMER:

APPLICATION:

IINSTALLATIONNSTALLATIONOOPERATIONPERATIONMMAINTENANCEAINTENANCE

Single Width Exhaust FansBI, GP and GI


2/152

INDEX

Introduction....4Safety

Receiving and InspectionHandling and StorageFoundationsDuct Connections

Operation Temperatures..5OperationPreventative MaintenanceMaintenance

Lubrication......6 - 7

V-Belt Drive.....8Installation of SheavesRemoval of SheavesVariable Pitch Sheave AdjustmentBelt Installation

Motors......9

GeneralWiringLubricationTypical Motor Current

Bearings..10Removing Defective BearingsMounting Bearings

Wheel Clearance Table....11Motor Weights

Trouble Shooting...12


3/153

CAUTION

This equipment can cause serious bodily injury and/or property damage. Responsible person-nel must be assigned to the Installation, Operation and Maintenance of this equipment. Be-fore operating this equipment, thoroughly read the installation, operation and maintenanceinstructions.

Before putting fan into operation:

1. Tighten all set screws in bearings and sheaves. Repeat after 8 hours operation. Repeat again after 2weeks. Check and tighten bolts on bearings, motor, motor base and fan housing.

2. Inspect bearings, sheaves and belts for alignment.

3. Rotate fan wheel by hand to check for free rotation. Check for shifting of wheel and shaft.

4. Inspect all accessories to insure connections are tight.

5. Do not operate fan without all guards in place.

6. Do not remove guards while fan is running.

7. Check for correct rotation of fan wheel by bumping starter momentarily. Wheel should rotate in samedirection of fan outlet.

8. Check for excessive vibration. If vibration is evident, shut fan off and determine cause. Do not oper-ate Fan until source of vibration is determined and corrected.

9. Velocity/CFM - Make sure exhaust fan is exhausting proper CFM. Higher CFM than design couldcause excessive misting at the scrubber outlet.

Any malfunct ion of the exhaust fan should be repor ted to MAPCO immediately for repair or ser-vice instructions.

Start-Up Service:In addition to this installation, operation and maintenance manual, MAPCO offers a factory trained ser-

vice representative to perform, assist or advise in the installation and start-up of this equipment. Thecost for this service can be quoted if desired.

Note: MAPCO assumes the "End User" is knowledgeable of this equipment and fully understands therisks associated with the installation, operation and maintenance of the equipment purchased.


4/154

INTRODUCTIONThe performance of every MAPCO fan dependson many factors. The purpose of this manual isto make you aware of these factors so you will ob-tain the utmost efficient and dependable perform-ance from your MAPCO equipment. Providing,care is exercised in installing this equipment, andit is given reasonable maintenance, you can beassured of trouble-free operation for years to

come.

Because it is not always possible to completelyprotect the careless worker, it is important that youstudy this manual prior to installing and operatingthis equipment to assure safe installation and op-eration.

SAFETYThe very nature of air handling equipment and ac-cessories present a hazard to personnel duringinstallation and maintenance. The following pre-

cautions should be observed prior to starting andmaintaining the fan:

1. The fan motor should be locked out. This isaccomplished by padlocking the disconnectswitch in the off position until installation ormaintenance is complete.

2. The fan housing should be inspected for debrisor any loose parts.

3. Installation should be complete with inlet and

outlet accessories attached.

4. All guards should be in place and secured.Never remove or replace any guards unlessfan is shutdown and locked out.

5. Do not open access doors while fan is in op-eration. Fan should be locked out prior to ser-vicing or inspecting fan wheel and other rotat-ing parts.

6. Never remove or replace wheels, sheaves or

shaft without thoroughly studying specific in-structions.

7. Never pry a belt over the edge of a sheave toremove or replace it. This could result in acracked sheave.

8. All dampers in duct system should be lockedin open position.

9. Never discharge corrosive or harmful fumesfrom the fan. Install proper air cleaning equip-ment as required by local authorities

10. Inspection of fan wheel, bearing and driveshould be performed on a regular basis. In-spect for corrosion which could result in me-chanical failure. Any corroded parts should be

replaced immediately.

11. Inspect ductwork for leakage of harmful or cor-rosive fumes.

12. Follow good safety practices when installing ormaintaining this equipment.

All equipment manufactured by Midwest Air Prod-ucts Co., Inc. has been thoroughly tested and in-spected at our factory in Traverse City, Michigan.

All fans are dynamically balanced and test run at

the operating R.P.M.

RECEIVING AND INSPECTIONUpon receipt of shipment, check first to see thatall items on bill of lading and/or packing slip havebeen received. By careful inspection determinewhether damage has occurred in transit. Anyshortage or damage should be noted and a claimshould be filed immediately.

HANDLING AND STORAGEIf installation of the fan is delayed and storage is

made outdoors, provide reasonable weather pro-tection. Special attention should be given to bear-ings to prevent the entrance of water. Whentransporting or installing a fan, the lifting eyesshould be used to prevent damage. Never pick afan up by its shaft.

FOUNDATIONSA rigid, level foundation is vitally essential forsmooth, quiet operation and good performance ofa fan. A frequent error is to design a foundationfor the weight of the fan only. Consideration

should be given for live load due to rotating equip-ment.

Poured concrete is preferred to steel or wood.Concrete foundations should have a minimumweight of five times the total weight of the fan.Steel platforms should be heavily braced for liveload support. When a solid surface is not practi-cal, fans should be mounted on vibration isolators.


5/155

DUCT CONNECTIONSDuct loads can cause fan distortion with conse-quent rough operation and damage. With this inmind, please observe the following:

1. Support ducts independently of fan.

2. Use flexible connections.

3. Inlet duct should be supplied with a flangedconnection approximately 3' to 5 from fan inletallowing convenient removal of wheel. An in-spection door is recommended for viewing faninlet cone.

OPERATINGTEMPERATURES1. PVC fans should not be used on constant tem-

peratures exceeding 130oF.

2. FRP fans should not be used on constant tem-peratures exceeding 160oF.

OPERATIONPrior to operating the fan the following pre-operative checks should be made:

1. Rotate fan wheel by hand to check for free ro-tation. Check for shifting of wheel and shaftwhich might have occurred in transit.

2. Inspect all accessories to insure connectionsare tight.

3. Inspect fan housing for debris.

4. Inspect bearings, sheaves and belts for align-ment. Also check set screws on bearing andsheaves.

5. Connect motor to proper power source as indi-cated on motor nameplate.

6. Check for correct rotation of fan wheel bybumping starter momentarily. Wheel shouldrotate in same direction as indicated by arrow

on fan housing. If fan rotates opposite arrowre-wire according to wiring instructions.

7. Check fan for excessive vibration. If vibration isevident shut fan off and determine cause. DONOT operate until the source of vibration iseliminated.

8. Check current draw of motor with amperesshown on motor nameplate. Do not operatemotor under overload conditions as this couldcause motor to fail and void manufacturer'swarranty.

9. Re-check all set screws and bolts after 8 hoursof operation and again after 2 weeks.

PREVENTATIVE MAINTENANCE1. FAN WHEEL -The fan wheel should be in-

spected periodically to insure no build-up hasoccurred. Build-up is more likely to occur whenthere is no air cleaning device prior to fan inlet.Chemical deposits that are allowed to build-up

will eventually break away in pieces. Whenthis happens the fan may be thrown out of bal-ance resulting in serious vibration and damageto the fan. Care should be taken when remov-ing chemical deposits. Never use sharp ob-

jects that could affect the integrity of the wheelcoating. If the chemical barrier has been dam-aged and corrosion is evident, replace thewheel immediately.

2. SHEAVES- Sheave grooves should besmooth and uniform. Burrs should be filed off

to prevent belt damage. Periodically check setscrews or bolts to insure they are tight.

3. BEARING AND MOTOR LUBRICATION Setup lubrication schedule according to manufac-turer's instructions. (See Bearing section)

4. MOTOR- Inspect motor periodically for dirtbuild-up. A clean motor runs cooler. Inspectbearings for roughness by disconnecting mo-tor from fan wheel and turning by hand. Note:Be sure fan motor is locked out prior to in-

specting motor.

MAINTENANCE1. Check for material bui ld-up on fan wheel. If

build-up is present, remove by one or all ofthe following:

A. High pressure washer

B. Scrape wheel with blunt object. Do not usesharp object which could damage coating.

2. Check for de-lamination of wheel weight. Ifwheel throws a weight consult factory forlocation and method of attaching weight.

3. Check for defective bearings. In most caseswhere excessive vibration is present, it is dueto the bearing seizing up and fan shaft spin-ning in bearing race. If allowed to run underthis condition, the shaft will wear and causeimbalance. (See bearing section)


6/156

4. Check alignment of sheaves. (See alignment ofsheaves)

5. Check static pressure. If static pressure islower than specified, the fan will produce addi-tional CFM and excessive vibration.

6. Check motor. Motor could have defectivebearings.

LUBRICATION

SLX BEARINGSare lubricated at the factory andrequires no further lubrication.

SC, SCB, SCM, SXR, SXRB BEARINGS

Storage or Special Shutdown - If exposed to wetor dusty conditions or to corrosive vapors, ex-tra protection is necessary: Add grease until itshows at the seals; rotate the bearing to dis-

tribute grease; cover the bearing. After stor-age or idle period, add a little fresh grease be-fore running.

High Speed Operation- In the higher speedranges too much grease will cause overheat-ing. The amount of grease that the bearingwill take for a particular high speed applicationcan only be determined by experience - see"Operating Temperature" below. If excessgrease in the bearing cause overheating, itwill be necessary to remove grease fitting to

permit excess grease to escape. The bearinghas been greased at the factory and is readyto run. When establishing a re-lubricationschedule, note that a small amount ofgrease at frequent intervals is preferable toa large amount at infrequent intervals.

Operation in Presence of Dust, Water or Corro-sive Vapors - Under these conditions the bearingshould contain as much grease as speed will per-mit since a full bearing with consequent slightleakage is the best protection against entrance of

foreign material. In the higher speed ranges toomuch grease will cause overheating - see "HighSpeed Operation" above.

In the lower speed ranges it is advisable to addextra grease to a new bearing before putting intooperation. Bearings should be greased as often asnecessary (daily if required) to maintain a slightleakage at the seals.

Average Operat ion - The bearings has beengreased at the factory and is ready to run. Thefollowing table is a general guide for relubrica-tion. However, certain conditions may requirea change of lubricating periods as dictated byexperience. See "High Speed Operation" and"Operation in Presence of Dust, Water or Cor-rosive Vapors" above.

Operating Temperatures - Abnormal bearingtemperatures may indicate faulty lubrication.Normal temperature may range from "cool towarm to the touch" up to point "too hot totouch for more than a few seconds" dependingon bearing size and speed and surroundingconditions. Unusually high temperature ac-companied by excessive leakage of greaseindicates too much grease. High temperaturewith no grease showing at the seals, particu-larly if the bearing seems noisy, usually indi-cates too little grease. Normal temperature

and a slight showing of grease at the sealsindicate proper lubrication.

Kind of Grease - Many ordinary cup greases willdisintegrate at speeds far below those at which

Dodge bearings will operate successfully ifproper grease is used. Dodge bearings havebeen lubricated at the factory with No. 3 con-sistency lithium base grease which is suitablefor normal operating conditions. Re-lubricatewith lithium base grease or a grease which iscompatible with original lubricant and suitable

for ball bearing service. In unusual or doubtfulcases the recommendation of a reputablegrease manufacturer should be secured. Seetable on the following page.

Bearings can be ac-cessed through shaftguard


7/157

LUBRICATION SCHEDULERead preceding paragraphs before establishing lubrication schedule

Suggested lubrication period in weeks

Hours

Run

PerDay

1 to

250RPM

251

to

500RPM

501

to

750RPM

751

to

1000RPM

1001

to

1500RPM

1501

to

2000RPM

2001

to

2500RPM

2501

to

3000RPM

8 12 12 10 7 5 4 3 2

16 12 7 5 4 2 4 1 1

24 10 5 3 2 1 1 1 1

V-BELT DRIVES1. INSTALLATION OF SHEAVES

A. Insert bushing into sheave and loosely insertcap screws. Be sure surface of taper lockbushing is clean and free of foreign mate-rials.

B. With cap screws heads facing the outside,slide assembly on to shaft making sure thekey stock is aligned with key way in shaft.

C. After both sheaves are in position align with astraight edge or string as indicated. Rotateeach sheave 1800and check until secure.Re-check alignment.

2. REMOVAL OF SHEAVESA. Remove belt guard and relieve belt ten-sion.

B. Back out cap screws and insert into tappedholes in sheave. Progressively tighten untilsheave separates from bush-ing.

C. Remove bushing and sheave.

DANGER: DO NOT INCREASE FAN RPMWITH-OUT CONSULTING FACTORY.SERI-OUS DAM-AGE COULD RESULT TOPER-SON-NEL AND EQUIPMENT.

String

Using a string or a straight edge, align sheaves by touching all four points as indicated by arrows.


8/158

3. VARIABLE PITCH SHEAVE ADJUSTMENTA. Remove belt guard and relieve belt tension.

B. Loosen set screw and remove key stock, al-lowing adjustable section to turn.

C. Turn adjustable section in for a larger pitch di-

ameter (increased speed), or out for a smallerpitch diameter (decreased speed). Every one-half turn will change the pitch diameter by one-tenth of an inch. Multiple groove sheavesshould be adjusted the same amount of turns.

D. Replace key stock and tighten set screw tolock sheave in place.

Note:When adjusting for higher fan speeds, check mo-

tor current to be sure readings are within nameplate and service factor ratings.

BELT INSTALLATION1. With all belts in their proper grooves adjust the

motor to take up all slack until the belts are

fairly taut.

2. Start the drive and check belts under load. Thebelts should have a slight bow as indicatedbelow.

3. After a few days of operation the belts will seatthemselves in the sheave grooves. It may benecessary to readjust so that the drive againshows a slight "bow" in the slack side.

Too Tight

Too Loose

FIXED DRIVE


9/159

MOTORS1.GENERALRead motor nameplate and check power supply

to be sure voltage, frequency and current car-rying capacity are correct. Motors indicating208/220/ 440 volts can be operated on 208,220 or 440 volt lines. This type of motor, whenoperated with 208volts at the motor terminals,will deliver approximately 11% less locked mo-

tor and breakdown torques and draw up to 4%more line current at rated load as comparedwith 220 volts at the terminals. The motor willperform satisfactorily on voltage variations ofplus/minus 10%, or frequency variation ofplus/minus 15% of the name plate rating, or acombine voltage and frequency of 10%.These variations do not apply to 208 volt ratingof motors stamped with 208-220/-440 volts.

2. WIRINGConnect the motor to the power supply according

to the diagram on the connection plate. Con-nections should be clean and tightly bolted.

To reverse the direction of rotation of a threephase motor, interchange any two of the linewires to the motor leads. Two phase motorsare reversed by inter-changing T-1 and T-3 orT-2 and T-4.

3. LUBRICATION

Follow manufacturer's literature.

4. TYPICAL MOTOR CURRENT ANDSTARTER SIZE

Amperes as indicated in chart are nominal andwere used for sizing starters only. DO NOTuse these values for sizing heaters or otheroverload protection. Refer to motor nameplatefor actual motor current and refer to the heatersize chart for actual starters used. Actual con-ditions under which the starters will operatemust be considered when sizing overload

heaters. It may be necessary to increaseheater size when starters are enclosed or ex-posed to radiant heat.

Three Phase Single Phase

230 Volts 460 Volts 575 volts 115 volts 230 volts

Amps Starter Amps Starter Amps Starter Amps Starter Amps Starter

1/2

3/41

1 1/2235

7 1/210152025

3040506075100125150200

2

2.83.65.26.89.615.22228425468

80104130154192249312360480

00

00000000112233

344555666

1

1.41.82.63.44.87.61114212734

4052657796

124156180240

00

000000000011222

333444555

.8

1.11.42.12.73.96.1911172227

324152627799

125144192

00

000000000011222

333444555

9.8

13.8162024345680

0

0011233

4.9

6.98101217284050

00

0000001223

HP


10/1510

Notes:1. When removing bearings, never beat on the

shaft as this could cause the shaft to movein the impeller hub and damage the wheelcoating.

2. It is important that the wheel is properly linedup. After bearings are installed and prior to

locking set screws, inspect relationship ofwheel and inlet cone. (See inlet cone align-ment). Rotate wheel by hand to insure wheeldoes not rub on inlet cone.

MOUNTING BEARINGSPrior to mounting new bearings, it is important to

inspect the shaft for wear at bearing mountinglocations. The diameter of shaft should not beundersized more than commercial groundand polished tolerances. Excessive wear willcause the bearing race and shaft to be non-concentric result-ing in an imbal-ance problem.

1. After inspecting shaft, slide the new bearingsover the shaft loosely.

2. Insert mounting bolts and secure bearing tobase. (Do not tighten bolts at this point).

3. Position shaft and pillow blocks as indicatedby markings and shim bearings as necessaryfor vertical alignment.

4. Tighten bearing's bolts. (Prior to locking bear-ing to shaft, turn impeller by hand to alignbearings).

5. Bearing's set screws and/or locking collarscan now be secured. Locktite should beused to insure set screws do not vibrateloose.

Notes:1. Remove inspection door and inspect relation-

ship of wheel and cone prior to tightening setscrews. It is important that wheel and cone donot touch. (See inlet cone alignment). Rotatewheel by hand to insure wheel does not rub oninlet cone.

2. If bearings are equipped with locking collars, itis important to observe the following instruc-tions.

The values on page (6) for full-load current are formotors running at speeds usual for belted motorsand motors with normal torque characteristics.Motors built for especially low speeds or hightorques may have higher full-load currents, andmulti-speed motors will have full-load currentvarying with speed, in which case the nameplatecurrent rating shall be used.

To obtain full-load currents of 208 volt and 200volt motors, increase corresponding 230 voltmotor full-load currents by 10 and 15 percent,respec-tively.

The voltages listed are rated motor voltages.Corresponding nominal system voltages are 110to 120, 220 to 240, 440 to 480, and 550 to 600volts.

BEARINGS

REMOVING DEFECTIVE BEARINGSIt is important to follow proper safety proceduresbefore dismantling fan. Be sure the power islocked out.

1. Remove shaft guard and clean shaft with em-ery cloth.

2. Coat shaft with oil and spray bearing race withpenetrating oil.

3. Remove belt guard, sheave and belt guardback plate.

4. Using a felt marker, mark on shaft location ofbearings. Also mark location (horizontally) ofbearing pillow blocks.

5. Using 2 x 4's, shim up the shaft in front of theoutboard bearing and remove set screws and/or locking collar.

6. Apply a downward pressure on the shaft usinga come-along or chain to hold shaft down. Becareful not to gouge shaft.

7. Loosen bolts on inboard bearing and removeoutboard bearing bolts.

8. Remove outboard bearing. This procedureshould be used for removing inboard bearingalso. Additional 2 x 4's will be required.


11/1511

A. Slip locking collar on inner race eccentric re-cess and slide bearing on shaft in same ar-rangement as noted in removal.

B. Position bearings to marks as indicated instep 3, mounting bearings.

C. Tighten bearing bolts.

D. Rotate locking collar in direction of shaft rota-tion and against inner races cam untileccentrics engage.

A. Slip locking collar on inner race eccentricrecess and slide bearing on shaft in same ar-rangement as noted in removal.

B. Position bearings to marks as indicated instep 3, mounting bearings.

C. Tighten bearing bolts.

D. Rotate locking collar in direction of shaft rota-tion and against inner races cam until eccen-trics engage.

FANSIZE

12 15 18 22 24 27 30 33 36 40 44 49 54 60

A 4 1/2 5 1/2 7 8 1/2 9 1/4 10 1/8 11 1/4 12 1/4 12 3/8 13 3/8 14 3/4 16 1/4 17 7/8 21 3/4

MotorHP

TEFC MotorFrame Size

MotorWeight

11 1/2

235

7 1/21015

20253040506075100125150

143T145T145T182T184T213T215T254T

256T284T286T324T326T364T365T405T444T445T

4045458290145160230

250355390550610835920

126015151785

A

INLET CONE

WHEELBACK PLATE

Dimension A should be measured at (4)points 900apart

HOUSINGBACK


12/1512

SHOULD YOU EXPERIENCE PROBLEMS WITH YOUR MAPCO EQUIPMENT, THE FOLLOWINGINFORMATION SHOULD BE UTILIZED IN DETERMING THE CAUSE AND SOLUTION TO YOURSPECIFIC PROBLEM.

PROBLEM POSSIBLE CAUSE

EXCESSIVE VIBRATION Material build-up on fan im-pellerWorn or corroded impellerImpeller out of balanceDe-lamination of balancing weightSheaves eccentric or out of balanceBearing or drive misalign-mentDefective bearingBelts too tightMismatched beltsMotor out of balanceFoundation not flat or level, weak or resonant foundationBent shaftImpeller or sheaves loose on shaftStatic pressure too low

HIGH BEAR-ING TEMPER-ATURE Over lubricationUnder lubricationWrong lubricant

Defective bearing

HIGH MOTOR TEMPERA-TURE Check input powerCheck fan rotationCheck for obstructions around motor shroudCheck system static pres-sure

AIR FLOW TOO HIGH Static pressure too low (less resistance to flow than ex-pected)Fan RPM higher than designDampers not installed or need to be adjusted

AIR FLOW TOO LOW Static pressure too high (more resistance to flow than expected)Impeller rotation wrong

Fan RPM lower than de-signObstructions or leaks in duct-workSharp elbows at fan inlet or outletNo straight duct prior to fan inletClogged filters

FAN DOES NOT OPER-ATE Electricity is turned off or improperly wiredBlown fusesBroken beltsLoose sheavesImproper voltageOverload protector has bro-ken circuit

EXCESSIVE NOISE Material build-up on fan im-pellerDefective bearingRPM too highImpeller out of balanceVibrating parts not isolat-ed from buildingFan operating in a stall condi-tion (DANGER)Loose mounting boltsVibrating ductworkBelts too loose or tightDuctwork too small


13/1513

FANWHEEL

FANHOUSING

INLETCONE

INLETHANGER

STEELPEDESTAL

FANSHEAVE

ADJUSTABLEMOTORBASE

MOTOR

GUARDBACKPLATE

BELT GUARD

MOTORSHEAVE

MOTORBUSHING

ACCESSDOOR

SHAFTGUARD

BEARINGS

MOTOR BUSHING


14/1514

PLANNED ISOLATION:

The isolation of machinery to prevent thetransmission of vibration has become one of theimportant phases of modern plant engineering.Because concrete, steel, and other building

materials are all good conductors of vibration, allmechanical equipment should be isolated.Properly planned isolation acts not only as a shieldto prevent vibration transmission to the foundation,floor, the building structure and surroundingequipment, but it also materially reduces dynamicbearing loads.

NOISE:

With passage of the Noise Control Act of 1972 andOSHA regulations which set limits to factory noise,

it is important that all areas of noise reduction beconsidered.

The use of a resilient medium between theequipment and structure acts to break the path ofstructural borne noise as well as noise resultingfrom sound waves that are magnified by the"sounding board" effect associated with machinerymounted solidly to the structure.

Use of isolation does not reduce air borne noisewhich if found to be above allowable levels must

be treated acoustically with acoustic enclosures orother sound absorbing devices.

SHEAR MOUNTS:

Elastomer-in-shear mounts provide up to 1/4"static deflection. When assembled in seriesdouble deflection to 1/2" is attained.

By varying the durometer (hardness) of theelastomer elements or by assembling them inparallel, unlimited load capacity is attainable.

Elastomer-in-shear isolators are available in unit,rail or integral base form and are commonly usedto isolate a variety of machinery whosepredominant disturbance is due to steady stateuniform vibrations above 600 cpm.

METAL SPRINGS:

Metal springs become preferable when therequired static deflections exceed 1/2". Springsare highly efficient mechanical vibration absorbersand their lack of inherent damping and sound

absorbing qualities may be readily overcome bythe application of properly designed damping andsound absorbing materials. The use of springdevices for large deflections dictates theincorporation of leveling bolts in order to facilitateinstallation and to compensate for variations indeflection.

Spring isolators are usually available either housedor free standing. Free standing springs areunrestrained devices which must be stable, i.e.,where the ratio of the lateral to the axial spring

constants is approximately equal; or where theoutside spring diameter is at least 0.8 of the springoperating height.

Housed springs vary in design and can befurnished with vertical and/or lateral restraintsdepending on the application. They are usuallypreferred over unhoused springs for in-plantinstallation.

Springs are excellent isolators for both steady statevibrations and for impact. Typical equipment

isolated for vibration are:

Blowers

Air Handling Units

Pumps

DONT'S for machine isolation

Dont make a bouncing ball out of your machine.It's important that isolation be just right, not too

hard nor too soft. At one point in it's softnessresonance develops and with plenty of trouble.

Dontignore uneven weight distribution. If you do,the isolation will compress unevenly and themachine will tip. Excessive tipping or rocking maylead to serious trouble.


15/15

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CorzanCorzanTMTMDuctDuct

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TerminatorTerminatorTMTM

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Motorized DampersMotorized Dampers

and thebeat

goeson

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