@EXAIR For Technical Assistance, Call An EXAIR Application Engineer 1-800-903-9247 Toll Free FAX (866) 329-3924 • E-mail: [email protected] • www.exair.com 24 Air Knives Super Air Knife Performance with .002" (0.05mm) thick shim installed Pressure Supply Air Consumption per Inch (25mm) Velocity @ 6" (152mm) from target Sound Level @ 3' (914mm) Force per Inch (25mm) @ 6" (152mm) from target PSIG BAR SCFM SLPM FPM M/S dBA OUNCES GRAMS 20 1.4 1.1 31 5,000 25.4 57 0.6 17 40 2.8 1.7 48 7,000 35.6 61 1.1 31 60 4.1 2.3 65 9,600 48.8 65 1.8 51 80 5.5 2.9 82 11,800 59.9 69 2.5 71 100 6.9 3.5 99 13,500 68.5 72 3.2 91 12” (305mm) Super Air Knife tested Holes Drilled In Pipe Pressure Supply Air Consumption 1/16" (1.59mm) dia. hole Air Consumption 3/32" (2.38mm) dia. hole Air Consumption 1/8" (3.18mm) dia. hole Air Consumption 3/16" (4.76mm) dia. hole Air Consumption 1/4" (6.35mm) dia. hole PSIG BAR SCFM SLPM SCFM SLPM SCFM SLPM SCFM SLPM SCFM SLPM 20 1.4 1.4 40 3.5 99 6.4 181 14.5 410 25 710 40 2.8 2.2 62 5.4 153 10.2 289 22.9 648 40 1,132 60 4.1 3.0 85 7.4 209 14 396 31 877 54 1,528 80 5.5 3.8 108 9.4 266 17.5 495 39.5 1,118 69 1,953 100 6.9 4.6 130 11.5 326 21.5 609 47.5 1,344 84 2,363 How To Calculate Air Savings: The chart at the top of the page 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 supply pressure. From the chart, find air consumption per hole. 2. Multiply air consumption per hole times the number of holes to obtain total air consumption. To Determine Air Consumption for the Super Air Knife 1. From the chart, find the air consumption per inch (25mm) at supply pressure and multiply by number of inches required. Example: 1. Existing blowoff is 18" long pipe with 1/16" diameter holes on 1/2" 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" 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, a reasonable average to use is $0.25 per 1,000 SCF (28,329 SL). 5. Dollars saved per hour = SCFM saved x 60 minutes x cost/1,000 SCF = 88.4 x 60 x $0.25/1,000 = $1.33/hour = $53.20 per 40 hour week = $2,766.40 per year savings Super Air Knife Specifications The Super Air Knife is available in standard lengths of 3", 6", 9" 12", 18", 24", 30", 36", 42", 48", 54", 60", 72", 84", 96" and 108". Special lengths and unlimited system lengths are available. Any number of Super Air Knives may be installed across a given area. Compressed Air Inlets: A Super Air Knife has compressed air inlets on each end and the bottom. Knives 24"-47" should use the 2 inlets at opposite ends of the knife. Knives 48"-59" use 2 inlets at opposite ends plus 1 near the middle on the bottom of the knife. Knives 60"-83" use 2 inlets at opposite ends plus 2 inlets equally spaced on the bottom of the knife. Knives 84" and longer use 2 inlets at opposite ends plus 3 inlets equally spaced on the bottom of the knife. Filtration: The use of clean air is essential. Kits include an automatic drain filter with a 5 micron filter element that is sized properly for flow. Materials of Construction: The Super Air Knife is available from stock in aluminum, Type 303 stainless steel, Type 316 stainless steel and PVDF. Other materials are available on special order. Mounting: The Universal Air Knife Mounting System is shown on page 29. The Super Air Knife can be supported by the compressed air pipe. Tapped holes (1/4-20) on the bottom are also provided. Regulation: A pressure regulator on the compressed air supply provides infinite control of flow, force and air consumption. Kits include a pressure regulator that is sized properly for flow. Shim Sets: The compressed air exhausts through a gap which is set with a shim. Force and flow may be increased by adding shims. Shim sets for aluminum Super Air Knives include a .001" (0.03mm) Amber color , .003" (0.08mm), Green color , and .004" (0.10mm) thick Tan color plastic shims. A Red color .002" (0.05mm) thick shim comes installed in the Super Air Knife. Shim sets for stainless steel Super Air Knives include (3) .002" (0.05mm) stainless steel shims. PVDF Super Air Knife shim sets include (3) .002" (0.05mm) PTFE shims. Airflow Pattern Super Air Knife
