Compressed air is used extensively for blow-off, cooling, and drying applications as blowers are not always powerful enough or have other disadvantages in the specific application. Since compressed air is a costly power source factories should reduce the compressed air cost by utilizing high efficiency engineered nozzles, air amplifiers and air knives. This technology is designed in such a way that it uses the compressed air to entraine and accelerate the surrounding air to deliver the same mass transfer effect as the single large opening in a standard nozzle, and even proving a better and more effective force because it reduces turbulence by providing laminar flow over a greater distance. The side effect is not only much less energy use, but also dramatically reduced noise levels.
However it is still very prevalent in factories to just use open tube and pipe for blowing compressed air. Even a small tube can exhaust a great deal of air wasting energy. The amount of air can be determined with a mathematical formula A more extensive formula is dependent on temperature and the condition of the inlet air, but by assuming standard conditions we can use the following simplified equation:
14.485 x D2 x (psig + 14.7) = “X” SCFM
D is the inside diameter of the opening in the pipe or tube in inches
PSIG is the compressed air gauge pressure in pounds per square inch
SCFM is the resulting flow rate in standard cubic feet per minute
Let’s assume we have just a small copper tube with an opening of 1/8 of an inch, not an uncommon site in blow off operations with compressed air at 80 PSIG. Using the formula it will consume:
14.485 x (.125)2 x (80 psig + 14.7) = 21.43 SCFM
If a 1/8” Nex Flow model 47003 engineered air nozzle was used instead (just place it at the end of the copper tube) it would consume only 11 SCFM at 80 PSIG. In addition the sound level is only 77 dBA at 3 feet verses at least 80 dBA from the open orifice.
Even if the reduced noise level (which improves the working environment) is not considered on the financing end, the air saving alone provides a quick payment on a minimal dollar investment.
It simply is not justified using open pipe and tubes for compressed air blow off when this technology is readily available at a low cost.
Nex Flow manufacturers quality, and economical, specialized compressed air products for blow, off, cooling, drying, and moving with representatives worldwide.