This week I worked with a customer trying to separate a 135” wide paper sheet from a fabric used for commercial paper towel machines. They were using 45 spray nozzles, spaced 3” apart on a manifold, to blow off the sheet which then would fall into a chute below. The nozzles were doing the job but they were growing more concerned with their compressed air expense for this process.
The current nozzle setup was also causing another issue – there were “empty voids or gaps” in the airflow between the nozzles, which resulted in creases in the fabric. They were considering adding more nozzles and spacing them 2” apart but that was only going to increase their compressed air expense, so I asked them to consider our Super Air Knife. They were intrigued but were concerned that they would consume more compressed air, you’ll see below that the Super Air Knife uses less air and eliminates the creasing problem because the Super Air Knife provides a continuous airflow from end to end.
After reviewing the specs, I determined that each nozzle was consuming 29.6 SCFM @ 90 PSIG of compressed air, meaning they were consuming 1,332 SCFM for the process (29.6 SCFM x 45 nozzles).
I recommended using (2) 48” and (1) 42” Aluminum Super Air Knives, coupled together, to provide a 138” laminar sheet of airflow. I chose these In Stock – Ready to Ship lengths, so the customer wouldn’t have to order a special length even though that lead time would have only been 3 days. The Super Air Knife only consumes 2.9 SCFM @ 80 PSI (per inch of knife), and provides a laminar sheet of uniform airflow with a 40:1 air amplification rate, which would not only perform in the application, but also provide the needed compressed air savings.
Since their process is a 24 hour operation, Monday – Friday, every week of the year, I calculated the following (* Using $ 0.25 per 1000 SCF used):
- 45 nozzles x 29.6 SCFM = 1,332 SCFM @ 90 PSIG
- 1332 SCFM (current) – 400.2 SCFM (EXAIR proposed) = 931.8 SCFM saved
- 931.8 SCFM x 60 minutes x $ 0.25 / 1000 SCF = $ 13.98 saved per hour
- $ 13.98 per hour x 24 hours = $ 335.52 saved per working day
- $ 335.52/day x 5 days = $ 1,677.60 saved per week
- $ 1,677.60 week x 52 weeks = $ 87,235.20 in yearly savings
After reviewing this savings with the customer, they mentioned they were glad they called because they were looking at increasing their air compressor size or purchasing another auxiliary unit. Now, they were not only going to save money on their current process, but they were eliminating the need to spend major funding on another compressor – not to mention the saved compressed air being available for future growth and processes.
At EXAIR, we commit to providing our customers with solutions to optimizing their current compressed air system.
Please contact an Application Engineer for optimizing your system today.