Super Air Knives Are Ideal For Super Aggressive Environments

Hydrochloric Acid. Sodium Hydroxide. Nitric Acid. Hydrogen Peroxide. Whether you know it or not, these are all commonly used around the house as tile/grout cleaners, drain openers, lawn fertilizers, and disinfectant for cut & scrapes, respectively.

They’re also used in a variety of industrial applications, such as the making of plastics, glass, pharmaceuticals, and wastewater treatment, respectively…all of which also have applications for which EXAIR Corporation’s Intelligent Compressed Air Products provide safe, efficient, and quiet solutions for.

Stainless Steel Super Air Knife Kits include the Air Knife itself, a Shim Set, an Automatic Drain Filter Separator, and a Pressure Regulator. The Air Knife & Shim Set are all Stainless Steel (grade 303 or 316, depending on which is specified) construction.

Consider the Super Air Knife: If you need one that’ll stand up to contact with hydrochloric acid, you’re looking for PVDF construction. Nitric acid is a different story – our 303SS, 316SS construction Super Air Knives are well suited for those applications.

On the other end of the (pH) spectrum, any of those materials are suitable for exposure to Sodium Hydroxide. PVDF is still the best choice, as the Stainless Steels will be subject to discoloration or slight corrosion, depending on the concentration.

PVDF Super Air Knife Kits include the Air Knife itself (PVDF body, Hastelloy C-276 hardware, and PTFE Shims,) a PTFE Shim Set, an Automatic Drain Filter Separator, and Pressure Regulator.

Acids and bases aside, oxidizers are also very corrosive, especially in higher concentrations.  Hydrogen peroxide is a commonly used oxidizer in industries as diverse as pulp & paper, soap & detergent, and water sterilization.  Like other chemicals, compatibility depends on the concentration, but like nitric acid & sodium hydroxide, our PVDF Super Air Knives are still the best, but the Stainless Steel models are still acceptable.

These are just a few, very basic, examples of chemical compatibility.  If you have an application that calls for installing one of our compressed air products in an area where you’re concerned about corrosion, give me a call.

Russ Bowman
Application Engineer
EXAIR Corporation
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EXAIR PVDF Super Air Knife in a Harsh Environment

Sometimes at EXAIR, we are challenged with an aggressive environment, and in this application, we had a customer that manufactured tractor batteries.  He was concerned about the sulfuric acid leaving the filling station area, and he wondered if we could help him.  After the batteries would get filled with sulfuric acid, they would be capped and then conveyed to a wash system.  He wanted to remove any excess acid that may have been on the battery for safety reasons.

PVDF Super Air Knife
PVDF Super Air Knife

I recommended our PVDF Super Air Knives.  These Super Air Knives are made with Polyvinylidene Fluoride (PVDF) with Hastelloy® hardware and a PTFE shim.  These materials are very inert to acid and caustic solutions.   Also with its unique design, it is able to optimize the compressed air usage with a consistent, strong blowing force.  The customer purchased three pieces of a model 110012-PVDF.  He was able to keep the hazardous sulfuric acid contained in the filling station.  As a bonus, he was able to increase the life of his washing solution because less acid was entering into the wash station.  He was so impressed by the effectiveness of the PVDF Super Air Knives that he purchased three more pieces for after the washing system.  He was able to speed up the drying process for QC checks and packaging.

If you are faced with an extreme challenge, you can contact an Application Engineer at EXAIR to see if we may have a solution for you.

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

 

Hastelloy is a registered trademark of Union Carbide and Carbon Corporation.

Where Would You Use a Large Stainless Steel Nozzle and Why?

This is a question that we are sometimes asked by clients who look at our complete Air Nozzle range and see that we have everything from the tiniest M4 nozzle up to some really large ones that fit a 1-1/4” steel pipe. So, what would you use model 1114SS for anyway?

I just so happen to have a perfect scenario for you as described below.

A recent customer inquired with me about some method to blow off large diameter electrode holders for a furnace application. For those of you who do not know, furnaces used to smelt aluminum, zinc, steel and other alloys tend to be very hot and dirty places.

Furnace

Being as such, a lot of debris tends to collect on horizontal surfaces including those of the electrode holders themselves.

electrode holder

What happens is dirt and dust are building up on the top of the holder and when it is opened it is becoming trapped between the holder and electrode causing arcing to go on inside the holder. The environment the solution will need to work in runs about 1500 – 1600°F. The area immediately around these holders is even hotter. So any nozzle placed in that environment will need to be able to withstand that temperature.

The solution: (3) model 1114SS (1 NPT Stainless Steel Super Air Nozzles) are placed in a triangular configuration to blow all the debris off of the top surface of the holder and electrode prior to opening to completely eliminate the arcing problem that had been occurring.

The key to the solution was to have an effective force generating nozzle that could project maximum force at distances well over 2 meters from a target and do so in a very hot application.

So, now you have one very good idea of how and where the larger Stainless Steel Super Air Nozzles can be used.

Neal Raker, Application Engineer
nealraker@exair.com