Industrial Fans 202 MODULE...

52nd North Carolina Industrial Ventilation Conference

Module DE-3-3 1

Industrial Fans 202Industrial Fans 202

Presented byPresented by

Bill Bill HowarthHowarth

DEDE--33--33 11

Vice PresidentVice President

Illinois Blower, Inc.Illinois Blower, Inc.Cary, IllinoisCary, Illinois

MODULE TOPICSMODULE TOPICS

FAN FAN AND SYSTEM NOISEAND SYSTEM NOISE

FAN VIBRATIONFAN VIBRATION

VFD FAN OPERATIONVFD FAN OPERATION

FAN SAFETYFAN SAFETY

DEDE--33--33 22

FAN’S ROLE IN AIR FAN’S ROLE IN AIR SYSTEMSYSTEM

The purpose of a fan is to supply an air system with energy (in the form of pressure) necessary to maintain airflow.

DEDE--33--33 33

NOISENOISE

DEDE--33--33 44

Noise: Sound or a sound that is loud,

unpleasant, unexpected, or undesired. Sound and Noise often used interchangeably

FAN NOISEFAN NOISE

Fan Sound Terminology

Fan Sound

Fan Selection

Fan Noise Control

DEDE--33--33 55

FAN SOUND FAN SOUND DESCRIPTIVE DESCRIPTIVE TERMSTERMS

Decibel Sound Power Sound Pressure

DEDE--33--33

Frequency Other Terms

66


Module DE-3-3 2

DECIBELDECIBEL

Decibel a unit 10 times the logarithm of the ratio of the sound power or pressure to a reference levellevel.

Decibels levels do not add up arithmetically. A decibel level 3 dB higher is equivalent to doubling the power.

Examples: 85 dB + 85 dB = 88.0 dB 83 dB + 85 dB = 87.0 dB 80 dB + 85 dB = 86.5 dB 75 dB + 85 dB = 85.0 dB

DEDE--33--33 77

SOUND POWERSOUND POWER

Like a Light Bulb Power referenced to 10-12 watts. Lw

S d i d Sound power is constant and not referenced to distance

DEDE--33--33 88

SOUND PRESSURESOUND PRESSURE

Pressure fluctuations is what we hear.

Power referenced Power referenced to 20 micropascals.

Lp

Conversion from Sound Power in given environment and at specific location

DEDE--33--33 99

FREQUENCYFREQUENCY

Sound Spectrum combination of discrete frequencies AMCA Octave Bands Low Frequency

Common Frequencies Speech Range

500-2000

A Rating Normalizes for human Ear

Centrifugal Fans High Frequency

Axial Fans

Normalizes for human Ear

Octave Band 1 2 3 4 5 6 7 8Center Frequency 63 125 250 500 1000 2000 4000 8000Frequency Range 45-90 90-180 180-355 355-710 710-1400 1400-2800 2800-5600 5600-11200

DEDE--33--33 1010

dBdBAA

dBA refers to a correction scale for how the human ear responds to sound levels at different frequencies.

DEDE--33--33

Band 1 2 3 4 5 6 7 8Center Frequency 63 125 250 500 1000 2000 4000 8000A Weighting Correction -25.5 -15.5 -8.5 -3.0 0.0 1.0 1.0 -1.0

1111

OTHER TERMSOTHER TERMS

Sones Linear Sound Level for Ear 20 Sones twice as loud as 10 Sones 20 Sones twice as loud as 10 Sones

Noise Criteria Rating Curves Single number to include more detailed

spectrum information

DEDE--33--33 1212


Module DE-3-3 3

FAN SOUND TESTSFAN SOUND TESTS

AMCA Standard Tests AMCA 300 Reverberant Room

Method AMCA 330 Laboratory in Duct AMCA 320 Laboratory Sound AMCA 320 Laboratory Sound

Intensity Types of Sound Power ratings for

fans Total Sound Power Discharge Sound Power Inlet Sound Power Radiated Sound Power Sones

DEDE--33--33 1313

FAN SOUND RATINGSFAN SOUND RATINGS

AMCA Standard 300 How Fan Sound is Measured

Installation Type A: Free Inlet, Free Outlet

Installation Type B: Free Inlet, Installation Type B: Free Inlet, Ducted Outlet

Installation Type C: Ducted Inlet, Free Outlet

Installation Type D: Ducted Inlet, Ducted Outlet

Test Accuracy Calibrated Sound Source

Fan Laws used to calculate to other sizes and speeds

DEDE--33--33 1414

FAN SELECTIONFAN SELECTION

Many Fans Can Hit the same point of operation AMCA Certification Comparing Fan Sound Levelsp g

Make sure you are comparing like data. Installation factors such as distance and Q Value need

to be the same.

DEDE--33--33 1515

MANY FANS SELECTIONSMANY FANS SELECTIONS

Axial Fans

Centrifugal Fans

DEDE--33--33 1616

ENVIRONMENT AFFECTS ENVIRONMENT AFFECTS SOUND LEVELSOUND LEVEL

Fan Inlets and Discharge Location and Direction Elevation of Fan Room Fan Installed In Number of Walls Materials Of Construction Foundation under Fan

DEDE--33--33 1717

SOUND TO THE LISTENERSOUND TO THE LISTENER

Open Inlet or Outlet Radiated Through Casing

Hole in Casing Ductwork Enclosures Hole in Casing, Ductwork, Enclosures Transmitted to Hoods

DEDE--33--33 1818


Module DE-3-3 4

COMPARING SOUND LEVELSCOMPARING SOUND LEVELS

Type of Data Power Vs Pressure, Ducting Etc

Field Correction (Q Value)

DEDE--33--33 1919

1 2 3 4 5 6 7 863 125 250 500 1000 2000 4000 8000

Discharge Sound Power Level 101 100 99 95 92 86 81 74A Weighting Correction -25.5 -15.5 -8.5 -3 0 1 1 -1Q=2 Field Correction -11.5 -11.5 -11.5 -11.5 -11.5 -11.5 -11.5 -11.5 Q=1 Q=2Sound Pressure Level, dBA 64 73 79 81 81 76 71 62 83 86

Radiated Sound Power Level 97 93 89 84 80 73 68 61A Weighting Correction -25.5 -15.5 -8.5 -3 0 1 1 -1Q=2 Field Correction -11.5 -11.5 -11.5 -11.5 -11.5 -11.5 -11.5 -11.5 Q=1 Q=2Sound Pressure Level, dBA 60 66 69 70 69 63 58 49 72 75

Dis

char

ge

Overall dBA RatingsDischarge dBA at 5

feet from Fan

Radiated dBA at 5 feet from Fan

Rad

iate

d

Octave BandCenter Frequency

NOISE NOISE DIFFERENCESDIFFERENCESYOU YOU CAN HEARCAN HEAR

Human Ear has wide range of perception. 3 dB Small increase in sound level

10 dB Sounds twice as loud 10 dB Sounds twice as loud

DEDE--33--33 2020

SOURCES OF FAN NOISESOURCES OF FAN NOISE

Fan Aerodynamic Noise Blade Pass Frequency

Mechanical Components Bearings Motors Drive Belts Air System Components

Vibration

DEDE--33--33 2121

SYSTEM EFFECTSSYSTEM EFFECTS

Fan Location Duct design and

L tLayout Acoustical

Impedance

DEDE--33--33 2222

CONTROLLING FAN CONTROLLING FAN NOISENOISE

Identify where is noise critical Proper Selection and

InstallationD k D i Ductwork Design

Silencers Enclosures Sound Blankets

DEDE--33--33 2323

CONTROLLING FAN NOISECONTROLLING FAN NOISE

DEDE--33--33 2424


Module DE-3-3 5

OSHA PERMISSIBLE OSHA PERMISSIBLE EXPOSURE LEVELSEXPOSURE LEVELS

Fans can generate sound that could be hazardous to exposed personnel. It is the responsibility of the system designer, installer, user, and

maintainer to comply with specific safety requirements mandated byfederal, state, and local codes; and to follow industry safety standards andpractices published by AMCA and by other recognized agencies andassociations regarding personnel safety from exposure to fan noiseassociations, regarding personnel safety from exposure to fan noiseassociated with use and exposure to the equipment.

Many OSHA requirements are based on exposure exceeding 85 dBA or90 dBA, time-weighted average, for an 8-hour day. Visit OSHA’s Websiteat:

www.oshawww.osha--slc.gov/OshStd_data/1910_0095.htmlslc.gov/OshStd_data/1910_0095.htmlwww. oshawww. osha--slc.gov/slc.gov/OshStd_dataOshStd_data/1926_0052.html/1926_0052.html..

DEDE--33--33 2525

LIMITING EXPOSURELIMITING EXPOSURE

Engineering Controls Fan Selection &

PlacementLi iti A Limiting Access

Silencers

Personnel Protective Devices Ear Muffs Ear Plugs

DEDE--33--33 2626

CONCLUSIONCONCLUSION

Fan Sound Levels are predictable and controllable. Proper selection and installation evaluation will prevent noisy problems.

DEDE--33--33 2727

FAN VIBRATIONFAN VIBRATION

Balance Vibration

Levels for Fans Levels for Fans

DEDE--33--33 2828

ANSI / AMCA 204ANSI / AMCA 204--9696

Balance Quality and Vibration Levels for FansLevels for Fans Balance

Vibration

DEDE--33--33 2929

BALANCEBALANCE

Balance Synonymous with Unbalance. A physical property

results in centrifugal force being applied to the fan impeller.

Measured as the product of unbalance mass and distance from axis of rotation (oz-in).

DEDE--33--33 3030


Module DE-3-3 6

UNBALANCEUNBALANCE

EXAMPLE: ROTOR WEIGHT = 300 LBS RADIAL SEPARATION OF

CENTER OF MASS FROM AXIS OF ROTATION=0 0052 INCHES

ShaftOF ROTATION=0.0052 INCHES

UNBALANCE =300 LBS * 16 OZ/LB *0.0052 IN.=25 OZ-IN.

DEDE--33--33 3131

Fan Impeller

UNBALANCEUNBALANCE

A. Particulate builds up uniformly on the rotor.

ScrubberSticky-wet

particulate in gas stream

DEDE--33--33

B. A piece of particulate flies off.

C. Center of mass shifts so that it no longer coincides with the axis of rotation.

Fan

3232

UNBALANCEUNBALANCE

DEDE--33--33 3333

200.0013

200.0000

UNBALANCEUNBALANCE

Dust accumulation inside hollow airfoil blade.

DEDE--33--33 3434

UNBALANCEUNBALANCE

Buildup of dust on the backside of backward curves blades

DEDE--33--33 3535

blades.

UNBALANCEUNBALANCE

Hub

DEDE--33--33 3636

Shaft

Setscrews initially hold hub tightly in position on the shaft. Setscrew tips are corroded or worn by fretting over time. This allows the hub and entire fan wheel to be displaced relative to the axis of rotation causing unbalance.

Interference fit eliminates the possibility of the hub being displaced relative to the shaft in most systems.


Module DE-3-3 7

EFFECT OF TEMPERATURE EFFECT OF TEMPERATURE CHANGECHANGE

Fan impeller initially operating at 70 F.Process gas temperature increases rapidly.

Weld

Fan impeller and hub heat up more quickly than the shaft

Integral hub and shaft for very rapid temperature change

DEDE--33--33

than the shaft. temperature change applications.

Conclusion: Initial interference fit should be in

excess of 0.002 inches to allow for thermal expansion plus an allowance for hub expansion due to centrifugal force.

Example: Shaft dia. = 3.9375 in. Hub average temp = 215 F Shaft average temp =80 F Then hub growth relative to shaft: (3.9375) * (80) * (6.5E-6) = 0.002

in. Fan impeller weight = 250 lbs.. (250 lbs. x 16 oz/lb. x 0.002

inches) Resulting unbalance = 8.0 oz-inches

3737

ANSI / AMCA 204, TABLE ANSI / AMCA 204, TABLE 44--11

Table 4-1 Fan Application Categories

APPLICATION EXAMPLESDRIVERPOWERkW (HP)LIMITS

FANAPPLICATIO

NCATEGORY,

BV

RESIDENTIAL Ceiling fans, attic fans,window AC

<= .15 (0.2)>.15 (0.2)

BV-1BV-2

HVAC &AGRICULTURAL

Building ventilation andair conditioning;

<=3.7 (5.0)>3 7 (5 0)

BV-2BV-3

DEDE--33--33 3838

AGRICULTURAL air conditioning;commercial systems

>3.7 (5.0) BV-3

INDUSTRIALPROCESS& POWERGENERATION, ETC.

Baghouse, scrubber,mine, conveying, boilers,combustion air, pollutioncontrol, wind tunnels

<=300(400)

>300 (400)

BV-3BV-4

TRANSPORTATION &MARINE

Locomotives, trucks,automobiles

<= 15 (20)> 15 (20)

BV-3BV-4

TRANSIT/TUNNEL Subway emergencyventilation, tunnel fans,garage ventilation,Tunnel Jet Fans

<=75 (100)> 75 (100)

ANY

BV-3BV-4BV-4

PETROCHEMICALPROCESS

Hazardous gases,process fans.

<= 37 (50)> 37(50)

BV-3BV-4

COMPUTER CHIPMANUFACTURE

Clean room ANY BV-5

ANSI / AMCA 204, TABLE 5ANSI / AMCA 204, TABLE 5--11

T a ble 5 -1

F ANAP P LIC AT IO N

C AT E G O R Y

BALA N C E Q U ALIT YG R AD E

F O R R IG IDR O T O R S /IM P E LLE R

BV -1 * G 1 6

B V 2 G 1 6

DEDE--33--33 3939

B V -2 G 1 6

B V -3 G 6 .3

B V -4 G 2 .5

B V -5 G 1 .0

*N ote : In F A N AP P LIC A T IO N C AT E G O R Y

B V -1 the re m a y be som e e xtre m e ly sm a llfa n rotors we ighing le ss tha n 2 2 7 gra m s (8ounce s) . In such ca se s, re sidua l unba la ncem a y be difficult to de te rm ine a ccura te ly.T he fa brica tion proce ss m ust e nsurere a sona bly e qua l we ight distribution a boutthe a xis of rota tion.

ANSI / AMCA 204, APPENDIX C.2ANSI / AMCA 204, APPENDIX C.2

DEDE--33--33 4040

VIBRATIONVIBRATION

Vibration The alternating mechanical motion of an elastic

system, components of which are amplitude, frequency and phase.

In general practice vibration values are reported as: Displacement - mils Velocity - inches/second Acceleration - peak g’s

DEDE--33--33 4141

VIBRATION VELOCITYVIBRATION VELOCITY1780 RPM1780 RPM

UU��

� 12�72 �� 12�72 ��

DEDE--33--33 4242

M�� V��M�� V��

��

�2�5 ��2�5 ��

�� 0�10 �� 0�10 ��


Module DE-3-3 8

VIBRATIONVIBRATION

Note that the bearing housing is considerably lower than the expected vibration of the rotor in free space.

V��V��

P��P��

M�� BM�� B

�� H�� H�

��

S�� D�� S�� D��

L�� R��L�� R��

DEDE--33--33 4343

H�� S��H�� S��

�� P�� P��

��

SLEEVE BEARINGSLEEVE BEARINGP�� P�� P�� P��

��

��

��S�� S��

��

DEDE--33--33 4444

B�� H��B�� H��

B�� L�� B�� L��

��

O�� F�� O�� F��

��

EFFECT OF STRUCTUREEFFECT OF STRUCTUREFan Mass Mass

Cyclic Forces

Structural Steel

DEDE--33--33 4545

Circus FlagpoleAcrobat

Flagpole acts asa spring

Fn = 30 cyc/min

Structural Steelacts as a springFn = 1200 cyc/minFan operating

speed = 1180RPM

Foundation

SOLID FOUNDATIONSOLID FOUNDATION

0 8

1.0

1.2

1.4

1.6N�� N��

F� � 1680 ��F� � 1680 ��

O�� O��

�F��F�

��

��

��

��

DEDE--33--33 4646

0.0

0.2

0.4

0.6

0.8

0 500 1000 1500 2000

0�10 ��0�10 ��

11801180

S�� RPM�S�� RPM�

F� �1�4 � FF� �1�4 � F

V��

V��

��

��

STRUCTURAL STEEL MOUNTINGSTRUCTURAL STEEL MOUNTING

1.2

1.4

1.6

N�� N��

F� � 1200 ��F� � 1200 ��

0�70 ��0�70 ��

O�� O��

�F��F�

��

��

��

��

0.0

0.2

0.4

0.6

0.8

1.0

0 500 1000 1500 2000

DEDE--33--33 4747

11801180


V��

V��

��

��

FLEXIBLE MOUNTFLEXIBLE MOUNTE�� E��

J��J��

E�� E��

J��J��D��

D��

DEDE--33--33 4848

I��

D��R�� S��R�� S��B��B��

�O�� O��

S�� I�� S�� I��

�� 1�0 �� 1�0 ��

F� � 187�7�1F� � 187�7�1�5�5 �187�7 ��187�7 ��S�� S�� P�S�� S�� P�

��


Module DE-3-3 9


Table 6-3 Seismic Vibration Limits for Tests Conducted in the Factory

Values shown are peak velocity, mm/s (inches/s),Filter-In, at the factory test speed.

FANAPPLICATION

CATEGORY

RIGIDLYMOUNTEDmm/s (in./s)

FLEXIBLYMOUNTEDmm/s (in./s)

BV-1 12.7 (0.50) 15.2 (0.60)

BV-2 5.1 (0.20) 7.6 (0.30)

BV-3 3.8 (0.15) 5.1 (0.20)

BV-4 2.5 (0.10) 3.8 (0.15)

BV-5 2.0 (0.08) 2.5 (0.10)

DEDE--33--33 4949

VIBRATION UNITSVIBRATION UNITS

DEDE--33--33 5050

TRANSDUCER MOUNTINGTRANSDUCER MOUNTING

V��V��

A��A��

SWSI Centrifugal Fans

DEDE--33--33 5151

H��H��


V��V��

A��A��

DEDE--33--33

DWDI Centrifugal Fans

H��H��

5252


A��A��H��H��

V��V��

��

DEDE--33--33

Axial Fans

V��V��

5353

VIBRATION SPECTRUMVIBRATION SPECTRUM

0�150�15

0�200�20

F�� F��

I�I�

��

��

��

��

F�� O��F�� O��

DEDE--33--33 5454

0�000�00

0�050�05

0�100�10

00 500500 10001000 15001500 20002000 25002500


V��

V��

�I��

�I��


Module DE-3-3 10


Table 6-4 Seismic Vibration Limits for Tests Conducted In-Situ

Values shown are peak velocity, mm/s (inches/s), Filter out.

Condition FanApplicationCategory

RigidlyMounted

mm/s (in./s)

FlexiblyMounted

mm/s (in./s)

Start-Up BV-1BV-2BV-3

14.0 (0.55)7.6 (0.30)6.4 (0.25)

15.2 (0.60)12.7 (0.50)8.8 (0.35)

BV-4BV-5

4.1 (0.16)2.5(0.10)

6.4 (0.25)4.1 (0.16)

Alarm BV-1BV-2BV-3BV-4

BV-5

15.2 (0.60)12.7 (0.50)102 (0.40)6.4 (0.25)

5.7(0.20)

19.1 (0.75)19.1 (0.75)16.5 (0.65)10.2 (0.40)

7.6 (0.30)

Shut-Down BV-1BV-2BV-3BV-4BV-5

NOTE 1NOTE 1

12.7 (0.50)10.2 (0.40)7.6 (0.30)

NOTE 1NOTE 1

17.8 (0.70)15.2 (0.60)10.2 (0.40)

Note 1: Shutdown levels for fans in FanApplication Grades BV1 and BV2 must beestablished based on historical data.

DEDE--33--33 5555

VFD OPERATIONVFD OPERATION

VFD Variable Frequency Drive Adjustable Frequency Drive Variable Speed Drive (Not Adjustable Belt Variable Speed Drive (Not Adjustable Belt

Drive)

Allows matching fan operation to system Requirements

Allows operation at efficient point in changing system

DEDE--33--33 5656

STANDARD SYSTEM STANDARD SYSTEM CONTROLCONTROL

Balance By Design One operating point

Damper Controlled System Damper Controlled System Inlet or Outlet Damper Inlet Box Damper Inlet Vane Damper

VFD Changing Speed to match requirement

DEDE--33--33 5757

BENEFITS of VFD BENEFITS of VFD OPERATIONOPERATION

Save Energy Use only what you need Lower Carbon footprint

Reduced Speed Lower power Lower noise levels Lower Vibration Levels Reduced maintenance requirements

Replace starter Start High horsepower or inertia loads

DEDE--33--33 5858

COSTS of VFD COSTS of VFD OPERATIONOPERATION

VDF integration and control Increased complexity

VDF maintenanceL th b lt d i Less than belt drive

Increased motor noise Reduced motor service factor Limits on distance between starter and

motor

DEDE--33--33 5959

VFD CONTROLVFD CONTROL

Control by system and program limits Pressure sensor

Flow / velocity sensor Flow / velocity sensor

DEDE--33--33 6060


Module DE-3-3 11


System Calculation Flow or Capacity

Pressure Requirements

essu

rees

sure

System Resistance Curve

System Losses Plotted

DEDE--33--33 6161

22

CFM x Constant 0.075 x 1097 x Area

CFMC x C

VP

SystemSystemLossLoss

CFMCFM

Pre

Pre


PPrreessss

PPooww

Required SPRequired SP

System CurveSystem Curve

SP vs. CFMSP vs. CFM

DEDE--33--33

Select a fan which will generate the required pressure at the desired airflow.

AirflowAirflow Desired CFMDesired CFM

ssuurree

wweerr

HP vs. CFMHP vs. CFM

6262

THE FAN LAWSTHE FAN LAWS

The Fan Laws are used to calculate fan performance at:Other Speeds, Other Densities, Other Fan Sizes

First Law:First Law:

2

3

212 RPM

RPM

DIA

DIACFMCFM

DEDE--33--33 6363

First Law:First Law:

11

12 RPMDIA

Second Law:Second Law:

1

2

2

1

2

2

1

212

RPM

RPM

DIA

DIASPSP

Third Law:Third Law:

1

2

3

1

2

5

1

212

RPM

RPM

DIA

DIAHH

THE FAN LAWSTHE FAN LAWS

PPrreess

PPoo

DEDE--33--33

ssuurree

wweerr

AirflowAirflow Changes in Speed

6464

VFD POWER SAVINGSVFD POWER SAVINGS

3

RPM

Power varies as the cube of the change in speed ratio.

)3/1(

old

newoldnew

old

newoldnew

HP

HPRPMRPM

RPM

RPMHPHP

DEDE--33--33 6565


Interaction of Fan Performance Curve and System Curve There is only one intersection between the fan curve and system

curve. Fans are load matching devices.

DEDE--33--33 6666

PPrreessssuurree

PPoowweerr

AirflowAirflow


Module DE-3-3 12

FAN RATING PROBLEMFAN RATING PROBLEM

Fan Adjustment – System Handling Toxic Air Given: In a hood system additional velocity may be required when

handling highly volatile or toxic materials. If the velocity must be doubled using a VFD what is the impact on the fan?…

Req CFM Req SP Req BHP Req RPMRequired Fan Performance

Fan Performance Curve2.5 1.2

DEDE--33--33

Find: – CFM– SP– BHP– RPM

Point Flow Pressure Power Speed 238.3656 3

1 0

2 63

3 136

4 251

5 1006

Act CFM Act SP Act BHP Avg RPM

240 1.65 4.8 1,793Point Flow Pressure Power Speed

1 0 1.8 2.6 1,7162 95 2.3 3.5 1,7133 191 2.0 4.3 1,7114 286 1.3 5.2 1,7075 429 0.2 6.1 1,702

0.0

0.5

1.0

1.5

2.0

2.5

0 100 200 300 400

Flow (CFM)

Pre

ss

ure

(in

WG

)

0.00.20.40.60.81.01.2

Fan Performance Curv e

0.0

0.5

1.0

1.5

2.0

2.5

0 100 200 300 400 500F low ( C F M )

0.0

1.5

3.0

4.5

6.0

7.5

6767

FAN RATING PROBLEMFAN RATING PROBLEM Fan Adjustment – System Handling Toxic Air

Given: In a hood system additional velocity may be required when handling highly volatile or toxic materials. If the velocity must be doubled using a VFD what is the impact on the fan?…

Find:Req CFM Req SP Req BHP Req RPM

480 6.6 9.1 1,701

Required Fan Performance Fan Performance Curves

3.0

6 0

7.0

DEDE--33--33

Find: – CFM– SP– BHP– RPM

,Point Flow Pressure Power Speed

1 0 1.8 2.6 1,7082 95 2.3 3.4 1,7053 190 2.0 4.3 1,7034 285 1.3 5.1 1,6985 427 0.2 6.0 1,693

Act CFM Act SP Act BHP Avg RPM

422 3.3 10.7 1,793Point Flow Pressure Power Speed

1 0.1 2.0 3.0 1,8002 100 2.5 4.0 1,7973 200 2.2 5.0 1,7954 300 1.4 6.0 1,7905 450 0.2 7.0 1,785

0.0

0.5

1.0

1.5

2.0

2.5

3.0

0 200 400 600

0.01.02.03.04.05.06.07.08.0

0.0

0.5

1.0

1.5

2.0

2.5

0 200 400 600

0.0

1.0

2.0

3.0

4.0

5.0

6.0

6868

INSPECTION & MAINTENANCEINSPECTION & MAINTENANCE

Inspection and routine maintenance on a periodic schedule of fan equipment is necessary.

Historical records of fan condition and maintenance should be maintained and compared with current conditions as they are indicators of upcoming problems.

Monitor and record vibration levels. Sudden changes in fan performance, noise, or vibration levels are often a precursor to

breakdownbreakdown. Fans should be inspected for condition, material buildup, and erosion.

DEDE--33--33 6969

FAN SAFETYFAN SAFETY

Fans contain moving parts and can be dangerous. Install guards. Know the “Hidden Dangers”

Suction and Pressure Windmilling

T t Temperature Noise and Environment Stroboscopic Effect Special Purpose Fans and Systems

Have a “lock out” procedure. AMCA Publication 410-96,

"Recommended Safety Practices For Users and Installers of Industrial and Commercial Fans" is an excellent resource.

DEDE--33--33 7070

CONCLUSIONCONCLUSION

Proper Fan Application, Selection, Installation, and Maintenance will result in excellent Fan System operations.

DEDE--33--33 7171

Industrial FansPresented by

Bill Howarthbhowarth@Illinoisblower [email protected]

Phone: (847) 639-5500Fax: (847) 639-9527

Illinois Blower, Inc., 750 Industrial DriveCary, Illinois 60013www.illinoisblower.com

7272DEDE--33--33


Module DE-3-3 13

7373DEDE--33--33

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