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Air Knives

How to Calculate Air Savings

Super Air Knife Air Consumption*
Pressure Supply Air Consumption per Inch (25mm)
PSIG BAR SCFM SLPM
20 1.4 1.1 31
40 2.8 1.7 48
60 4.1 2.3 65
80 5.5 2.9 82
100 6.9 3.5 99
                                  *with .002" (0.05mm) thick shim installed
                                  12" (305mm) Super Air Knife tested


The chart above shows the air consumption of a Super Air Knife per inch of length (25mm) at various pressures. Comparable data is given for holes drilled in pipe.

To Determine Air Consumption for the Drilled Pipe

  1. Determine the size of existing holes and current supply air pressure. From the chart below, find air consumption per hole.
  2. Multiply air consumption per hole times the number of holes to obtain total air consumption.

Holes Drilled In Pipe

Air Consumption Of Drilled Pipe
Air Consumption PSIG 20 40 60 80 100
BAR 1.4 2.8 4.1 5.5 6.9
1/16" (1.59mm) dia. hole SCFM 1.4 2.2 3.0 3.8 4.6
SLPM 40 62 85 108 130
3/32" (2.38mm) dia. hole SCFM 3.5 5.4 7.4 9.4 11.5
SLPM 99 153 209 266 326
1/8" (3.18mm) dia. hole SCFM 6.4 10.2 14 17.5 21.5
SLPM 181 289 396 495 609
3/16" (4.76mm) dia. hole SCFM 14.5 22.9 31 39.5 47.5
SLPM 410 648 877 1,118 1,344
1/4" (6.35mm) dia. hole SCFM 25 40 54 69 84
SLPM 710 1,132 1,528 1,953 2,363

To Determine Air Consumption for the Super Air Knife

  1. From the chart at the top, find the air consumption per inch (25mm) at current pressure and multiply by number of inches required.

Example:

  1. Existing blowoff is 18" (457mm) long pipe with 1/16" (1.6mm) diameter holes on 1/2" (12.7mm) spacing (37 holes), 80 PSIG supply. Air consumption from chart is 3.8 SCFM per hole. Total air consumption is 37 x 3.8 = 140.6 SCFM (3,981 SLPM).
  2. Use 18" (457mm) Super Air Knife with standard .002" (0.05mm) gap and 80 PSIG supply. Air consumption from chart is 2.9 SCFM per inch. Total air consumption is 18 x 2.9 = 52.2 SCFM (1,478 SLPM).
  3. Compressed air saved = 140.6 SCFM - 52.2 SCFM
    = 88.4 SCFM (2,503 SLPM).
  4. Most large plants know their air cost. If you don't know your actual cost/1,000 SCF, a reasonable average to use is $.25 per 1,000 SCF (28,317 SL).
  5. Dollars saved per hour = SCFM saved x cost/1,000 SCF x 60 minutes
                 = 88.4 x .25/1,000 x 60
                 = $1.33/hour
                 = $53.20 per 40 hour week
                 = $2,766.40 per year savings

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