Maintenance Tips

Reasons for blower failure
Service instructions
Horsepower calculation
V-Belt tensioning
Pressure relief valves
Oil levels and specifications
Minimum allowable sheave diameter
Temperautre rise calculation
Horizontal versus Vertical airflow

 

REASONS FOR BLOWER FAILURE

  • Oil problems
  • Dirty air filters
  • Excessive speeds
  • Discharge pressure is too high
  • Sheave is too far out on shaft
  • Blower feet not shimmed
  • Swing clapper of check valve is missing
  • V-Belts are too tight and out of alignment
  • High inlet air temperatures
  • Dirty intake air piping

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SERVICE INSTRUCTIONS

Change initial charge of oil after two (2) weeks
Thereafter, every six (6)months
If in dirty or high temperature location, change oil every three (3) months
Lower temperatures - lighter oil or oil heaters
Higher temperatures - heavier grades of oil or an external oil cooler

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HORSEPOWER CALCULATION

BHP = RPM x CFR x P x 0.00474

BHP = Brake horsepower
RPM = Speed (revolutions per minute)
CFR = Displacement (cubic feet per revolution)
P = Pressure rise (pounds per square inch)
0.00474 = Constant

TL70, DISPLACEMENT - @ .282 C.F.R.
CAPACITY - 450 SCFM @ 10 PSIG
SPEED - 2040 RPM

With clean filter - BHP = 2040 x 10 x 0.282 x .00474 = 27.27
With dirty filter - BHP = 2040 x 10.5 x 0.282 x .00474 = 28.63
P = 15" W.C.
BHP differential = 1.36
Extra cost = 1.36 x 24 x 300 x $0.07 = $685.00/year
Plant with 20 Blowers - 20 x $685.00 = $13,700.00/year

GOOD REASON TO KEEP FILTERS CLEAN

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BELT TENSIONING

Recommended Deflection Force Per Belt
For Super HC® V-Belts, Super HC PowerBand® Belts,
Super HC Molded Notch V-Belts or
Super HC Molded Notch PowerBand Belts
V-Belt Cross Section Small Sheave Diameter Range (Inches) Small Sheave RPM Range Speed Ratio Range Recommended Deflection Force (lbs)
Minimum Maximum
3VX 2.20
2.35 - 2.50
2.65 - 2.80
3.00 - 3.15
3.35 - 3.65
4.12 - 5.00
5.30 - 6.90 		1200 - 3600
1200 - 3600
1200 - 3600
1200 - 3600
1200 - 3600
900 - 3600
900 - 3600		 2.00
to
4.00		 2.8
3.2
3.5
3.8
4.1
4.8
5.8		 4.1
4.7
5.1
5.5
6.0
7.1
8.6
5VX 4.40 - 4.65
4.90 - 5.50
5.90 - 6.70
7.10 - 8.00
8.50 - 10.90
11.80 - 16.00 		1200 - 3600
1200 - 3600
1200 - 3600
600 - 1800
600 - 1800
400 - 1200		 2.00
to
4.00		 9.0
10
11
13
14
15		 13
15
17
19
20
23
5V 7.10 - 8.00
8.50 - 10.90
11.80 - 16.00 		600 - 1800
600 - 1800
400 - 1200		 2.00
to
4.00		 11
13
14		 16
18
21
8V 12.50 - 17.00

18.00 - 24.00		 600 - 1200

400 - 900		 2.00
to
4.00		 28

32		 41

48

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PRESSURE RELIEF VALVES

Capacity Data (Scfm Air)
Set Pressure P.S.I.G.

Size 6 7 8 9 10 11 12 13 14 15 16 17 18
3/4" 76 80 84 88 92 96 100 104 108 112 116 120 124
1" 136 143 150 157 164 171 178 185 192 199 206 213 220
1 1/4" 212 223 234 245 256 267 278 289 300 310 321 332 343
1 1/2" 307 322 338 354 370 386 401 417 433 449 465 481 496
2" 543 571 599 627 655 683 711 740 768 796 824 852 880
2 1/2" 848 892 935 979 1023 1067 1100 1154 1198 1242 1286 1329 1373
3" 1227 1290 1354 1417 1481 1544 1607 1671 1734 1797 1861 1924 1988

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OIL LEVEL

(BLOWER NOT RUNNING)

High quality turbine type of single viscosity grade
Do not use automotive oils - tend to keep dirt in suspension
Essential additives - rust, foam and oxidation inhibitors
For operation at 32 F 90 F - SAE 40 grade
Equivalent oils:

Texaco - R&O 150
Pennzoil - Pennzbell R&O 150
Mobil - DTE Extra Heavy
PetroCanada - Harmony 150
Esso - NUTO 150

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MINIMUM ALLOWABLE BLOWER SHEAVE DIAMETER: INCHES

Blower
Model		 Pressure (psig)
2 & under 4 6 8 10 12 14
Vaccuum (inches Hg)
4 & under 8 12 14
TL 30
TL 40
TL 41		 4
4
5		 4
4
5		 4
5
5		 4
5
6		 5
6
-		 6
-
-		 6
-
-
TL 50
TL 60
TL 61		 5
6
7		 5
6
7		 5
6
7		 6
7
8		 7
8
-		 8
-
-		 8
-
-
TL 70
TL 80
TL 81		 6
7
8		 6
7
8		 6
7
8		 7
8
-		 8
9
-		 9
-
-		 9
-
-
TL 90
TL 100
TL 101		 8
9
10		 8
9
10		 8
9
10		 9
10
-		 10
11
-		 11
-
-		 11
-
-
TL 110
TL 120		 10
11		 10
11		 10
11		 11
12		 12
14		 14
-		 14
-

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TEMPERATURE RISE CALCULATION


Temperature rise (T) = (Ti x BHP x 0.92) / (0.00436 (K / (K-1)) x PSIAi x Vi)

Ti = Inlet ambient temp. (DEG. F) + 460 (DEG. R)
BHP = Horsepower required at blower shaft
0.92 = Constant
K = Ratio of specific heats (1.395 for air)
PSIAi = Inlet pressure at gauge + 14.7 = absolute pressure
Vi = Inlet volume in cubic feet per minute (CFM)

For air at standard conditions (sea level @ 70 F)
0.00436 ( K / (K-1) ) = 0.1542

At standard conditions, T = 2150 x BHP / Vi

OR:
For every one (1) pound pressure rise, discharge temperature will be increased by 13 degrees F above ambient

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HORIZONTAL VERSUS VERTICAL AIRFLOW

Horizontal Vertical
  • Dirt and condensation will not exit blower. This may cause buildup and damage blower
  • Only one gear in oil
  • Less oil in reservoir
  • Lower maximum speed
  • Feet close together - not the strongest configuration
  • Dirt and condensation will exit blower.
  • Both gears are in oil
  • More oil in reservoir
  • Higher maximum speed
  • Feet further apart - strongest configuration

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