Replacing Liquid Nozzles with Engineered Air Nozzles

I wrote a blog a few weeks ago about increasing efficiency with EXAIR Super Air Nozzles.  In the application for that blog we used engineered nozzles to place open pipes, resulting in an efficiency increased of ~65%.  This week’s installment of efficiency improvements boasts similar figures, but through the replacement of misused liquid nozzles rather than open pipe.

The image above shows a compressed air manifold with a number of nozzles.  BUT, the nozzles in this manifold are not compressed air nozzles, nor do they have any engineering for the maximization of compressed air consumption.  These are liquid nozzles, usually used for water rinsing.

In this application, the need was to blow off parts as they exit a shot blasting machine.  When the parts exit the shot blasting process they are covered in a light dust and the dust needs to be blown away.  So, the technicians on site constructed the manifold, finding the liquid nozzles on hand during the process.  They installed these nozzles, ramped up the system pressure to maintain adequate blow off, and considered it finished.

And, it was.  At least until one of our distributors was walking through the plant and noticed the setup.  They asked about compressed air consumption and confirmed the flow rate of 550 m³/hr. (~324 SCFM) at 5 BARG (~73 PSIG).

The end user was happy with the performance, but mentioned difficulty keeping the system pressure maintained when these nozzles were turned on.  So, our distributor helped them implement a solution of 1101SS Super Air Nozzles to replace these inappropriately installed liquid nozzles.

By implementing this solution, performance was maintained and system pressure was stabilized.  The system stabilization was achieved through a 61% reduction in compressed air consumption, which lessened the load on the compressed air system and allowed all components to operate at constant pressure.  Calculations for this solution are shown below.

Existing compressed air consumption:  550 m³/hr. (324 SCFM) @ 6 BARG (87 PSIG)

Compressed air consumption of (9) model 1101SS @ 5.5 BARG (80 PSIG):  214 m³/hr. (126 SCFM)

Total compressed air consumption of 1101SS Super Air Nozzles:

Air consumption of 1101SS nozzles compared to previous nozzles:

Engineered air nozzles saved this customer 61% of their compressed air, stabilized system pressure, improved performance of other devices tied to the compressed air system, and maintained the needed performance of the previous solution.  If you have a similar application or would like to know more about engineered compressed air solutions, contact an EXAIR Application Engineer.

Lee Evans
Application Engineer
LeeEvans@EXAIR.com
@EXAIR_LE

Increasing Efficiency With EXAIR Super Air Nozzles

Earlier this morning I received a phone call from a gentleman in search of a more efficient compressed air solution.  The application was to remove thermoformed plastics from a mold immediately after the mold separates.  In the current state, the application is consuming ~40% of the available compressed air in the facility through the use of (9) ¼” open pipes, consuming a confirmed 288 SCFM at 60 PSIG.  Due to the use of an open pipe, this customer was facing a safety and noise concern through the existing solution.

After discussing the application need and the desire to reduce compressed air use, reduce noise, and add safety, we found a suitable solution in the 1101 Super Air NozzleInstalling (9) of these EXAIR nozzles will reduce the compressed air consumption by over 65%!!!  Calculations for this savings are below.

Existing compressed air consumption:  288 SCFM @ 60 PSIG

Compressed air consumption of model 1101 @ 60 PSIG:  11 SCFM

Total compressed air consumption of  (9) 1101 nozzles:

Air savings:

This is the percentage of air which the new EXAIR solution will consume.  To put it another way, for every 100 SCFM the current solution consumes, the EXAIR solution will only require 34.38 SCFM. Installing these EXAIR nozzles will result in lower operational cost, lower noise levels, and increased safety for this customer – all while maintaining or improving the performance of the blow off solution in this application.

EXAIR Application Engineers are well versed in maximizing efficiency of compressed air systems and blow off needs.  If you have an application with a similar need, contact an EXAIR Application Engineer.  We’ll be happy to help.

Lee Evans
Application Engineer
LeeEvans@EXAIR.com
@EXAIR_LE

2” Flat Super Air Nozzles Separate Sheets of Metal Film

Heat Exchanger plates

An overseas company manufactures brazed plate heat exchangers. This type of heat exchanger has a series of corrugated plates that are stacked onto each other. It is designed to create a turbulent flow for better heat transfer in a very compact size. The plates inside the heat exchanger are made of 321 stainless steel which is basically a 304 type of stainless steel but with a titanium stabilizer. This company would receive plain sheets of stainless steel material that were stacked on each other in a column. The dimensions of the plates were as follows: 305mm wide by 520mm long with a thickness of 0.5mm (12” Wide X 20.5” Long X 0.02” thick respectively). Each sheet weighed 635 grams (1.4 lbs.). They would set a stack of the stainless-steel sheets at the beginning of a press machine. The press machine would form the corrugated design into the face of the sheet. They were using a pick-and-place vacuum system to lift one sheet at a time to place inside the press. They started having problems with their process when occasionally two or three sheets would stick together. The underlying sheet could either fall onto the floor which would bend the sheet or be stacked inside the press which would cause an improper corrugation. Both issues were causing much scrap as well as downtime in their process .

They contacted EXAIR to find a way to improve the efficiency of their process. They wondered if static could be causing the “sticking” issues. Generally, static forces are really noticed with sheets made of plastic or non-conductive materials. The stronger the static force, the more issues with sticking and misalignment. EXAIR does offer Static Eliminators to remove static forces in applications just like this. But, with plain metal sheets, static is not a problem as the ions are able to balance themselves.

Typically, the main cause for metal sheets to “stick” together is surface tension. Liquid like water has a strong affinity to itself within the molecular structure, called cohesion, and to the surface that it lies on, called adhesion. The cohesion plus the adhesion to the metal surface can have a strong enough force to overcome the weight of the sheets. To break the surface tension, an additional force is required.  An example of surface tension is with nylon tent material. The surface tension of water is strong enough to keep rain drops from penetrating the fabric. If you break the surface tension by touching the tent material, the surface will start to leak water. The same goes for the thin sheets of metal. We just need to break the surface tension to allow the sheets to separate.

2″ Flat Super Air Nozzle

I recommended two pieces of the model 1122, 2” Flat Super Air Nozzles. This nozzle gives a flat air pattern to force air between the sheets. Surface tension is based on force over length. Once the sheets start to separate, the contact length will decrease thus reducing the “sticking” force caused by surface tension. In this application, the amount of cohesion and adhesion forces caused by surface tension were unknown. Oil, water, and other liquids have different surface tensions which would require different amounts of blowing forces. To ensure the proper amount to separate the sheets, I recommended the shim set, model 1132SS.

The shims have different thicknesses that can be installed easily into the 2” Flat Super Air Nozzle to change the amount of blowing force.  In conjunction with a regulator, this customer could “dial” in the proper amount of force required to counteract the surface tension from any type of liquid that may be on the surface of the sheets.  I had them mount one nozzle at two different corners to help “peel” the sheets apart. The customer also tied in a solenoid valve into the compressed air system to cycle on the 2” Flat Super Air Nozzles only during the time when the vacuum system wanted to grab the top sheet. This reduced the amount of compressed air needed for their operation.  After the installation, the procedure ran smoothly without downtime and scrap waste.

If your application is creating scrap and downtime caused by sheets sticking together, EXAIR has many types of products to help eliminate this. Whether the “stickiness” is caused from static or liquid adhesion, an Application Engineer can direct you to the best product to eliminate the “stickiness”. For the overseas company above, we were able to apply a sharp flat burst of air to overcome the surface tension between the sheets.

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

 

Heat Exchanger Plates by epicbeerCreative Common by 2.0

 

Engineered Air Nozzles and Jets Outperform – Save Air, Increase Safety, Save Money

EXAIR’s Engineered Air Nozzles and Air Jets provide a simple solution to lower compressed air usage and reduce noise levels for compressed air blowoff operations.

Why Air Nozzles and Jets – When compared to commonly used open copper tubes or pipes, compressed air savings can be as high as 80%. And with less compressed air, sound levels are greatly reduced.  A 10 dBA noise level reduction is typical.  All EXAIR Air Nozzles and Jets meet the Occupational Safety and Health Administration (OSHA) maximum dead end pressure and sound level exposure requirements. They also carry the CE mark.

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The largest selection of engineered Air Nozzle sizes and materials are only available form EXAIR 

EXAIR Nozzles are engineered to take advantage of the Coanda effect to amplify the airflow up to 25 times or more. Compressed air is ejected through the small orifices and surrounding air is entrained into the main stream. The resulting air stream is a high volume, high velocity blast of air at minimal consumption.  EXAIR manufactures many styles, from the very small, but powerful Atto Super Air Nozzles, to the largest 1-1/4 NPT Super Air Nozzle.  Also offered are 1″ and 2″ wide Flat Super Air Nozzles, and the Back Blow style for cleaning out tubes, pipes, channels or holes from 1/4″ to 16″ in diameter.
EXAIR Air Jets utilize the Coanda effect (wall attachment of a high velocity fluid) to produce air motion in their surroundings.  A small amount of compressed air (1) is throttled through an internal ring nozzle above sonic velocity.  A vacuum is produced, pulling in large volumes of surrounding, or ‘free’ air, through an around the jet (2).  The exit flow is the combination of the two air sources (3).

air-jet
How an Air Jet Works

EXAIR manufactures Air Jets in two types, High Velocity, and Adjustable with materials of construction of brass and Type 303 Stainless Steel.  The High Velocity Air Jet uses a changeable shim to set the gap, controlling the force and flow of the air.  The Adjustable does not use a shim, and has a micrometer gap indicator and locking ring to allow for varying force and flow performance.

AirJetFamily
EXAIR Air Jets – High Velocity type on the left, Adjustable type on the Right

If you have questions about Air Nozzles and Jets, or would like to talk about any EXAIR Intelligent Compressed Air® Product, feel free to contact EXAIR and myself or one of our Application Engineers can help you determine the best solution.

Brian Bergmann
Application Engineer

Send me an email
Find us on the Web 
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Twitter: @EXAIR_BB

Engineered Nozzles Replace Segmented Coolant Hose for Ink Drying Application

flat nozzle loc line comparison
Segmented Hose on the left and an HP1126 1″ Flat Nozzle on the right

A common item that can be found in a majority of machine shops is the blue or gray knuckle-jointed hose used to dispense coolant on lathes and CNC machines. EXAIR also uses this same hose with our Cold Guns and Adjustable Spot Coolers for applications that cannot or do not wish to use liquid coolant as a means of keeping the heat down on their tooling. Since the cold air discharges at atmospheric pressure, this is an acceptable application. Another application is using this style of hose as a compressed air blowoff. This is NOT a proper use of the hose and is not only a considerable waste of compressed air but can also pose a safety hazard. Using this method for compressed air blowoff is not compliant with OSHA 1910.242(b) (a directive we blog about).

I was recently contacted by a customer in Indonesia that was using an array of (6) of these knuckle-jointed hoses with a ¼” round nozzle attachment for a blowoff operation. The customer had a series of rubber pads used in the construction of a toy castle. The pads were brought along by an overhead conveyor and a design was printed on the head of the pad. The nozzles were used to dry the ink before the pad made it to the next part of the process. This was a new product line and the processes involved were being evaluated for potential places to save on compressed air rather than adding overall capacity to their system. After using a variety of EXAIR products for other blowoff applications, they came back for another engineered solution.

After testing both a 1009-9280 (Adjustable Air Nozzle w/ 30” Stay Set Hose) and an HP1126-9280 (1” High Power Flat Nozzle w/ 30” Stay Set Hose), the customer determined that the airflow pattern from the 1” Flat Nozzle was more conducive to drying the rubber pad and purchased the remaining units to replace their original method. The compressed air savings was noticed immediately!!

For the old operation, they had to regulate the pressure down on the hose to 25 psig so that the hose wouldn’t break apart. (1) This hose , with a ¼” round nozzle, will consume 52 scfm at 25 psig of supply pressure. With (6) of these they were consuming a whopping 312 scfm!! Since the HP1126 is compliant with OSHA directive 1910.242(b) and will not break apart at higher pressures, they were able to operate at 80 psig while only consuming 17.5 scfm. They saved more than enough air for their new process and are evaluating whether or not they can turn off one of their smaller 25 HP compressors.

The new setup with the EXAIR engineered solution was able to save them 207 scfm of compressed air. Assuming a cost of $.25/1000 scfm and a 40 hr work week, this translates to an overall savings of $6,458.40 per year off of their utility bill.

207 scfm x 60 minutes x 8 hrs/day x 5 shifts/week x 52 weeks/year =25,833,600 scf

25,833,600 scf x ($.25/1000 scf) = $6,458.40

If you’re using an inefficient compressed air blowoff in your facility, give us a call. An Application Engineer will be happy to evaluate your process and determine the safest and most efficient solution. With same day shipment for stock items on orders placed by 3:00 pm EDT, we can get a solution out to you by the following day!

Tyler Daniel
Application Engineer
E-mail: TylerDaniel@exair.com
Twitter: @EXAIR_TD

EXAIR Super Air Nozzles: 38 Day ROI Saves Money

Blow off station

I received an email from an engineer that was looking at our Super Air Nozzles.  They currently were using four blow-off lines that were made from 6mm ID copper tubes.  (Reference picture)  The system was designed to blow out holes after machining.  The engineer was in charge of the task of optimizing 25 machining stations similar to this one.  He was familiar with EXAIR products from his previous employment, and he recognized the waste of compressed air by using open pipe.  He purchased four Nano Super Air Nozzle, model 1110SS, for a trial.  He was impressed with the performance, the low sound level, and the engineered design in safety.  But, for upper management in his company, he had to show a cost savings in order to change all the stations in the facility.  He asked me to help him in calculating the compressed air savings.

He gave me some additional details about their application.  He was using the compressed air about 30% of the time throughout an 8 hour day at a pressure of 80 PISG.  He wanted to present the savings per day, week, and year as well as the payback period in his evaluation.  I have performed many of these calculations for other customers and was happy to help.  It is sometimes easier to speak in terms of savings, as everyone can relate to money, especially management.  (The numbers below can be adjusted to match your application and blow-off devices).

Knowns:

Cost of compressed air: $0.25/1000 cubic feet of air (this is based on $0.08/Kwh of electrical cost)

Flow: 1110SS Nano Super Air Nozzle – 8.3 SCFM at 80 PSIG

Flow:  6mm ID copper tube – 42 SCFM at 80 PSIG

 

The difference in compressed air flows from a 6mm tube to the Nano Super Air Nozzle is (42 SCFM – 8.3 SCFM) = 33.7 SCFM.  At a 30% duty cycle, we get 33.7 SCFM * 0.3 = 10.2 SCFM (cubic feet/minute) of additional compressed air being used.

Per day, the additional amount of compressed air wasted is:

10.2 cubic feet/minute * 60 min/hr * 8 hr/day (one shift) = 4,896 cubic feet per day.

Per week, the additional amount of compressed air wasted is:

4,896 cubic feet/day * 5 days/week = 24,480 cubic feet per week.

Per year, the additional amount of compressed air wasted is:

4,896 cubic feet/day * 250 days/year = 1,224,000 cubic feet per year.

 

With the cost to make compressed air at $0.25/1000 cubic feet, we have the following:

4,896 cubic feet/day * $0.25/1000 cubic feet = $1.22 per day

24,480 cubic feet/week * $0.25/1000 cubic feet = $6.12 per week

1,224,000 cubic feet/year * $0.25/1000 cubic feet = $306.00 per year.

From these values, the payback for a model 1110SS Super Air Nozzle is just under 38 days.  Because the EXAIR Super Air Nozzles are so efficient, some utility companies will offer a rebate program to use them.  This will improve your ROI even more.  (We can check to see if your local electric company participates in these programs).  Just think, the remaining life of the Super Air Nozzle will be using less compressed air and saving much money for the company.

The calculations above are only for one nozzle.  As discussed above with the engineer, they had 4 tubes/station and 25 stations in their plant.  So, if you multiply each figure by 100, you can see the large amount of money that can be saved.   The engineer presented these figures to upper management, and it was an easy decision to replace all the copper tubes with EXAIR nozzles.

Nano Super Air Nozzle

Don’t be fooled by the initial cost of a tube, pipe, drilled holes, or a substandard nozzle.  You can see by the facts above, if you use any additional compressed air in your blow-off application, it will cost you a lot of money in the long run.  If you need any help in calculating how much money EXAIR products can save you, you can use our Air Savings Calculator from our website, or you contact an Application Engineer at EXAIR.  We will be happy to help you.

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

EXAIR Back Blow Nozzle: An Overview

In certain applications such as blowing chips or debris out of a pipe or blind hole, it may not be possible to blow forward. The pipe may be too long, making it impossible to push the debris all the way down the pipe or the other end of the pipe may not be open. In either of these scenarios, the Back Blow Nozzle is the right tool for the job. An array of holes around the diameter of the Back Blow Nozzles provides a powerful 360° airflow pattern that will clear out any leftover coolant or chips from the machining process.

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Small 1004SS easily clears debris

EXAIR has three different size Back Blow Nozzles; the 1004SS (M4 x .5), the 1006SS (1/4 NPT), and the 1008SS (1” NPT). The 1004SS is recommended for use on pipes as small as ¼” and up to 1”. The 1006SS can be used for a wide range of pipe sizes, from 7/8” up to 4”. The 1008SS nozzle offers the greatest overall force for stubborn or sticky materials stuck to the inside diameter of the pipe. This nozzle is suitable for use in pipes ranging from 2”-16”. As the Back Blow Nozzle will be blowing chips and debris back out of the pipe towards the operator, it is always recommended that a Chip Shield is used. The strong polycarbonate Chip Shield will keep them safe from flying debris and keep you in compliance with OSHA directive 1910.242(b). For visual representation of the performance of the Back Blow Nozzle, take a look at this short video clip that demonstrates its use.

All of EXAIR’s Back Blow Nozzles are available with extensions. For the 1004SS we have extensions from 6”-36”, and from 12”-72” for the 1006SS and 1008SS. The Back Blow Nozzle can also be installed on our VariBlast, Soft Grip, Heavy Duty, and Super Blast Safety Air Guns. With such a wide range of available sizes and configurations, we can tackle just about any internal pipe cleaning application. If you have a process in your facility that may benefit from the use of one of these nozzles, give us a call and get one on order today!

Tyler Daniel
Application Engineer
E-mail: TylerDaniel@exair.com
Twitter: @EXAIR_TD