A food processing plant who just eliminated 30 of their homemade blowoffs and replaced them with Exair Super Air Knife saved $13,665 per year with each pipe replaced!
Existing blowoff is approx. 500mm long pipe with 54 x 2.38mm diameter holes operating at 80 PSIG (5.5 BAR). Air consumption from chart is 9.4 SCFM per hole. Total air consumption is
54 x 9.4 = 507.6 SCFM
Use 24" (610mm) Super Air Knife with standard .002" gap and 80 PSIG supply. Air consumption from chart is 2.9 per inch. Total air consumption is 24 x 2.9 = 69.6 SCFM
Compressed air saved = 507.6 SCFM - 69.6 SCFM = 438 SCFM
Most large plants know their air cost. If you don't know your actual cost, a reasonable average to use is $0.25 per 1000 SCF
Dollars saved per hour = SCFM saved x 60 minutes x cost/1000 SCF = 438 x 60 x $0.25/1000
*Based on national average electricity cost of 8.3 cents per kWh. Annual cost reflects 40 hours per week, 52 weeks per year.
pay for itself in less than seven (7) weeks!