I recently received an inquiry from a customer to test their current air guns through our Efficiency Lab service. According to the operators, the handheld blow gun they were purchasing from a commercial retailer was too loud and complaints were rolling in. They were also hoping to save some compressed air in the process as they were performing an energy audit at the same time.
The gun they sent in looked fairly similar to our Precision Safety Air Gun but it did not have an engineered nozzle on the tip of it. Instead, it was simply a cross cut hole in a piece of material. The air inlet to the gun was a 1/4″ NPT just like our Precision Safety Air Gun, the extension on the gun was slightly longer, the only significant variance I saw was the tip.
To try and get as much information as possible I measured the O.D. and I.D. of the extension, the hole size was approximately .140″. I measured the extension on our Precision Safety Air Gun just to see what is different, it came in at the same size. So, I flow tested the competitive blow gun with their tip on it and came up with air consumption of 12.69 SCFM, noise level of 92 dBA at 3′ away, and a blowing force of 11.5 oz at 80 psig. I then measured the same attributes of EXAIR’s model 1410SS-CS Precision Safety Air Gun at 80 psig inlet pressure. The model 1410SS-CS measured 8.3 SCFM, gave 8.1 ozs of working force, and only produced a 75 dBA sound level from 3′ away.
The sound level reduction was a total of 17 dBA which is below the OSHA standard for allowable noise level exposure, as well as reduced their air consumption by 4.39 SCFM. That is almost a 35% reduction in their compressed air usage per gun replaced. After seeing these levels of reduction the customer had more than enough information to provide management with in order to replace the blow guns not just for noise level reduction but also because it will reduce air use and save money. A clear supportive role in their energy audit.
When I was visiting a supplier in Japan, our host was extremely proud of their koi pond and wanted to demonstrate something. He took us to the pond’s edge and clapped his hands. From the murky depths of the pond emerged huge koi breaking the surface with open mouths. As their reward, he tossed them a handful of fish food.
While everyone else was enamored with his ability to have trained the fish, I was awestruck with the fact that they could hear the sound of clapping deep down into the pond. No wonder dad kept telling me to be quiet or you will scare the fish away.
According to the National Wildlife Federation fish don’t have ears that we can see, but they do have ear parts inside their heads. They pick up sounds in the water through the lateral lines that runs down each side of its body and transmitted to their internal ear.
While human auditory abilities may not be as sensitive as the rest of the animal kingdom, the inner workings of our ears are very sensitive easily damaged. Listening to loud noise for long periods of time can damage the hair cells in the inner ear. Noise-induced hearing loss usually develops gradually and painlessly. We live in a noisy world and hearing loss among Americans is significant. According to the Center for Hearing and Communications, approximately 12% of the U.S. population or 38 million Americans have a significant hearing loss.
The cold weather kept me indoors this weekend and I conceded to being a couch potato in front of the TV. One of the shows I watched was the lumberjack competitions – and let me tell you, those guys are crazy. Standing on a board wedged into a notch in the side of a tree, up 40 feet in the air and swinging an ax is just not safe. But, that was the way it was done in the early days before mandated safety rules.
Afterward, I watched a little news only to see hundreds of motorists stranded in their cars due to inclement weather. Folks were on their way home from work and ended up sleeping in their cars. I know it is recommended that you carry an emergency kit in your car but I never gave it any thought it would be needed it in the city. Then I was jolted from my couch when the smoke alarms went off. I forgot about my buffalo wings in the oven. Wow! What if I had left the house?
In the workplace, compressed air safety should be a top priority. Open compressed air lines are extremely noisy and can cause permanent hearing loss which is addressed OSHA Standard 29 CFR – 1910.95 (a) regarding the allowable noise exposure. High pressure compressed air can pierce the skin and enter the blood stream, causing a dangerous blood embolism – this is why OSHA has standard CFR 1910.242(b), 30 PSI maximum dead end pressure for compressed air blow off.
One of the main issues with regulating all of your compressed air lines to less than thirty psig is, thirty psig does not provide a very effective blow off. With EXAIR’s engineered nozzles the air can be kept at higher line pressure and still meet or exceed the OSHA standard. Higher pressure equate to higher velocity and more force upon your application. Because of this, we can solve the application, keep compressed air to a minimum, and keep safety a top priority.
EXAIR nozzles are safe, provide very effective blow off, and reduce compressed air consumption. By design they produce output flow up to 25 times the compressed air consumed. For more information or help with your application call our application engineers at 1-800-903-9247