Last week I fielded a call from a steel plant who was using a manifold of 50 stainless steel, flat nozzles evenly spaced across a 130″ area, to blow off light scale and cooling water from steel sheets. The nozzles were working somewhat but they were seeing some “streaks” of scale and water remain after the initial blow off point. They were considering adding another manifold of nozzles as a secondary treatment but were concerned with the amount of air a setup like that would require, as well as the cost as each nozzle cost nearly $250.00 each. Operating at close to 80 PSI, they determined that each of the nozzles was using around 35 SCFM or roughly 1,750 SCFM for the manifold. Adding another manifold would obviously double that figure to 3,500 SCFM which would be a TON of compressed air to blow off water and light material.
After some further discussion, I recommended using (1) of our 60″ and (1) of our 72″ Stainless Steel Super Air Knives, coupled together, to provide a 132” laminar sheet of airflow. The laminar flow of air would be even across the entire 132″ length, eliminating any weak or dead areas like they are seeing with the existing setup, which is causing the streaking. The Super Air Knife uses only 2.9 SCFM per inch of knife when operated at the same 80 PSIG supply, so for 132″ of Super Air Knife, they would be using approximately 383 SCFM, much less than the current 1,750 SCFM, alleviating their concern for increased air demand. With the amount of air they would be saving, they could purchase the 60″ and 72″ Stainless Steel Super Air Knives, and the coupling kit to REPLACE their existing manifold system, eliminating the need of adding another manifold.