Of the 3 styles of Air Knife offered by EXAIR, the Super, Standard and Full-Flow, the Super Air Knife is our most efficient, in regards to compressed air usage. Using a 40:1 amplification rate of entrained ambient air to compressed air consumed, it uses only 2.9 SCFM per inch of knife length when operated at 80 PSIG, while producing a low sound level of only 69 decibels (the quietest on the market today). The Super Air Knife provides an even laminar flow of air across the length of the knife and is available in single piece lengths from 3″ up to 108″ in aluminum, 303 stainless and 316 stainless as well as up to 54″ in PVDF (Polyvinylidene Flouride) construction for applications where aggressive chemicals may be present. 1/4″ FNPT air inlets are available on each end as well as on the bottom of the knife.
For Super Air Knives 24″ and longer, you need to plumb air to multiple inlets to maintain an even airflow. Our available Plumbing Kits includes the properly sized hose or pipe and fittings, to not only save valuable time looking for these parts yourself but also eliminates the potential of using undersized lines which will reduce the performance of the Super Air Knives.
For Super Air Knives in aluminum construction, the Plumbing Kits include cut to length PVC compressed air hose and the required brass fittings.
The Plumbing Kits for our stainless steel and PVDF Super Air Knives, include 316ss cut to length pipe as well as 316ss fittings.
The Super Air Knife is the ideal choice when looking to treat wide-area applications, like cleaning a conveyor or drying parts after a wash process. For help selecting the best product to fit your process, contact one of our application engineers for assistance.
One of the fun parts of Application Engineering at EXAIR is explaining the operation of Vortex Tubes to our customers. Sometimes they’re described as a “reverse tornado” inside of a tube, spinning a pressurized airstream and converting it into a hot and cold flow. Other times we describe it through the generation of two vortices with differing diameters, and the difference in diameters results in one vortex shedding energy in the form of heat.
But, no matter the way we explain their operation, we always stress the importance of proper compressed air plumbing. If the compressed air piping/hoses/connections are not properly sized, performance problems can arise. (This is true for any compressed air driven device.)
This fundamental came to light when working with one of our customers recently. They were using a medium sized Vortex Tube to provide spot cooling in an enclosed space, but were not seeing the flow and temperature drop they knew to be possible with an EXAIR Vortex Tube. And, after looking at installation photos of the application, the root cause was quickly spotted.
I noticed what looked to be a very small hose connected to the inlet of the Vortex Tube in the image above.
After further inspection of another photo, the small diameter tube was in full view. This small hose serves as a restriction to compressed air flow, which in turn limits both flow and operating pressure of the downstream devices. What that meant for this application, was poor performance from the Vortex Tube, all stemming from this reduction in piping size.
When looking to find the root cause of a performance issue with a compressed air driven unit, things aren’t always as easy as they were with this application. A visual inspection is always a good idea, but if everything looks correct, here is a list of troubleshooting steps to consider:
Check for quick-disconnects in the plumbing system. Quick-disconnects are great from an operator’s perspective, but they can wreak havoc on compressed air flows due to small inside diameters and air volume restriction.
Determine the operating pressure at the device. This is imperative. In order to make proper decisions to correct the performance concern, good information is required. Knowing what is happening at the device is crucial for proper understanding. There may be 100 PSIG at the main compressed air line, but only 60 PSIG at the device due to plumbing problems. A pressure gauge at the inlet of the compressed air product can provide this information.
Check that the compressed air system has enough volume to properly supply the device. A compressed air driven unit without the correct volume of compressed air is just as bad as having a lack of pressure.
Check for leaks. The US Department of Energy estimates that 20-30% of compressor output in industrial facilities is lost as leaks. If your system and devices aren’t operating as they’re supposed to, check for leaks. They may be contributing to the poor performance. (Don’t know where your leaks are coming from? Use our Ultrasonic Leak Detector!)
Fortunately for this customer, after improving the size of this tubing performance was on par with our published specifications and this customer was back in operation. If you have a question about how to improve the utilization of the compressed air devices in your application, contact an EXAIR Application Engineer.