Condensation in Dust Collectors

Let's look at three service reports which illustrate the problems of condensation and outline the possible solutions.

London, Ontario Installation;
Cartridge Dust collector retrofit on Plasma cutting stations
The client complained of having to service the cartridges every 1-2 days because they would plug up. The pressure drop across the collector would rise to 8-10 inches water column. The cleaning system was totally redesigned, and six 36” high ratio style cartridge filters replaced twenty-four 26” tandem cartridges. 80/20 paper blend cartridges were installed temporarily until special anti-pinch style polyester filters could be supplied. Within two days the paper cartridges blew apart, mostly at the closed end-cap. They did run the pulsed cleaning system at 100psi instead of 85psi, with no regulator on the line. However, that was not enough to rip the media apart, so, something else was the cause. Upon inspection of the cartridges, we observed that the media was dry but had the look of being wetted. Also there were watermark stains on the clean side of the media. There was an accumulator tank on the compressed air line leading to the collector. The maintenance people told us the accumulator was installed because the valve manifold wasn’t large enough to hold enough residual pressure during a pulse. The manifold was just fine. What was happening is that the air line was very long (over 200 feet) from the compressor to the collector. Moisture would condense in the line then drop out at two elbows, which was the low point just before going up to the manifold. This choked the line which made the manifold appear like it was too small, and then suddenly a slug of water would blow through to the valves and into the cartridges. We recommended taking out the accumulator tank and, just before the connection to the valve manifold, installing an air line coalescing filter, top quality dryer, and a regulator set for 85psi. We also recommended an automatic drain valve system on the manifold tank. The collector now runs continuously at 3-3.5inch pressure drop. The client says they’ve never been able to control the contaminants at the plasma stations so well since they installed the system 1.5 years prior to the retrofit.

Maine Installation; Energy Recovery from Trash and garbage.
This collector installation was venting a large room where garbage was dumped. Front-end loaders took this garbage and carried it to the hoppers that fed an incinerator. Steam was produced that fed a boiler. The pulse jet collector vented 65,000 ACFM at ambient conditions. It was running at a 15:1 filter ratio and at 2 “ water column from January to June. In June the pressure drop started to creep upwards about 1/8 of inch per week. This collector was well instrumented with continuous recording of wet bulb and dry bulb temperatures as well as pressure drop. We compared the pressure drop increases with the weather reports in the local newspapers. The increases occurred early in the morning on days when the wet bulb and dry bulb temperature were closer than 5 degrees F. There were several kinds of trash being handled in the facility. We recommended that they not load the wet trash into the incinerator until after 10:00 a.m. This stopped the rising pressure drop problem. Since they shut the system down on weekends we recommended that they clean the collector for two hours on Saturday afternoon with the outlet fan damper 90% closed. This was almost as effective as off line cleaning and the dust was not blown back into the loading room during the procedure. The dust collector ran for at least two years, at less than three inches water gauge pressure drop after implementing these recommendations.
General Comments The cleaning system was running at 85 psig. Under typical conditions the compressed air expands to critical pressure which is 37psig. beyond this pressure, the pressure to velocity conversion stops and from 37 psig to atmospheric pressure, 0 psig, the energy is turned to heat from turbulence. This nullifies the refrigeration cycle as the compressed air expands to critical pressure. This collector used converging diverging nozzles which had a complete conversion of pressure to energy so that the refrigeration cycle was reducing the temperature in the jet by approximately 5-8 degrees F.
Actually the turbulence below 37 psig causes some heat regain but the jet is still 5-8 degrees cooler despite this. Without the regain it would be about 9-12 degrees cooler. With a converging diverging nozzles the amount of cooling from expanded compressed air in the jet is a bit colder but the amount of induced air from the plenum is almost twice as much as with an ordinary orifice so the jet temperature is about 6-8 degrees cooler but not enough to make a difference. In Maine, the problem was mainly in the summer when the trash was wet from people dumping beer and other associated liquids. They did not have the problem in the winter when the trash was dry.
There were two other approaches that could have been used to counter the rising pressure drop:
1) Larger pulse valves and eliminating the nozzles. However, this would increase air consumption by over 35%.
2) Manifold heaters could be installed that would raise the temperature of the cleaning jet above ambient even to the point where wet garbage could be processed in high humidity conditions.
In either case, the collector could not handle vent volume where the gas entering the collector has condensed water droplets.
Low pressure compressed air, in the range of 7 to 22 psig is often employed for pulse jet cleaning systems. These have the same effect as the cleaning system with converging diverging nozzles since no turbulence occurs as complete expansion occurs in the orifice or nozzle. The best remedies are as follows:
1. Locate the low pressure compressor near the pulse valves and insulate the manifold leading to the pulse valves.
2. Use a manifold heater in the compressed air header, same as described above.
Other Comments and observations. There are many other installations in energy recovery plants that use high ratio reverse air fan collectors, The temperature regain on the reverse air fan is higher than ambient and eliminates condensation considerations described above.

East Tennessee Installation; Powder coating
This plant in the upper elevations in the mountains used a pulse jet collector to vent a powder coating operation that coated the internals of residential wash machines. This pulse jet collector started in July and ran until the middle of the winter when it developed a creeping rise in pressure drop characteristics. The wet and dry bulb spread was usually over 15 degrees F except early in the morning when it was about ten degrees. Investigation of the operation was conducted and we measured wet and dry bulb temperatures with a sling psychrometer mounted through a hole in the main vent duct. What we discovered is the booths were manually washed with a hot water hose every morning. At times the gas would go through the dew point for several minutes and then immediately go back to operation at a wide dew point spread. We recommended mounting a heater with a damper on a branch line to the vent system. The heater was triggered by pressure switches on the hot water hoses in each booth. This eliminated the creeping pressure drop problem permanently.

Use these links to obtain more information:
Dust Collector retrofits
Dust collection
Baghouse, cartridge dust collector

STAR BAGS

Below is a sketch of the Star Bag.

They came out about 10 -15 years ago as a pre-cursor to the pleated bags. It was a way to get the results of a cartridge filter style dust collector at high temperatures. Cartridges are limited to a maximum of 170degF. Also, the objective was to reduce dust penetration to adjoining bags during a cleaning cycle. It offered more surface area per bag to increase dust collection capacity per filter element. The dust collector could run at lower air-to-cloth ratios, thereby reducing the pressure drop. Our dust collector correspondence course teaches that this is a fallacy.

We believe someone in Canada makes these but we couldn't tell you who. Some filter suppliers may know someone. These are very much more expensive than standard bags and cages. You can accomplish the same and have better results with a new advanced technology baghouse or retrofitting an existing dust collector to the new technology.

Ask for our free dust collector correspondence course and read numerous articles on dust collection technology at our internet website www.qamange.com.

Spark Arresters Prevent Fires

Transport of sparks through ducts; Referring to the sketch below, there is a glowing ember (red particle) surrounded by some hot air (yellow envelop) which gives the spark buoyancy. This spark (at approx 1400degF) and the hot gas (at approx 800degF) associated with it can travel hundreds of feet in a duct. The ductwork is designed to give laminar (smooth ) flow. This is illustrated on the left of the QUENCHER spark arrestor. Spark suppressors are placed in the duct to change the flow to turbulent (coarse) flow, as shown on the right of the QUENCHER spark arrestor. This agitation or turbulence strips the air from around the ember thereby removing the fuel (oxygen) and breaking up the envelop of hot air, therefore extinguishing and cooling the spark below ignition temperature (pink particle).
Prevention depends on eliminating the causes of ignition. Spark traps can change laminar to turbulent flow and extinguish any sparks in a duct. Design duct systems for proper dust transport velocities. Install a pneumatic actuated duct booster to flush dust into the dust collector. Use air jets to remove electrostatic charges on the duct surfaces.

Quencher Spark Arrestors, click here.

Filter (or air-to-cloth) Ratio as a governing specification: A Gross Engineering Mistake

New Advanced Technology eliminates design flaws; allows for High Ratio Operation.

The History of Reverse Jet and Pulse Jet Design and Development must be reviewed to determine proper selection of collectors.

The first pulse jet collector was developed by Pulverizing Machinery of Summit New Jersey in the early 60’s, to collect dust from their Pulverizers. They had tried to use the Blow-ring design but they could not handle the dust (powder ) loads as their grinder Pulverizers became bigger. The typical load to the collectors from the Pulverizers were between 150 and 300 grains per cubic foot. The collector design was based on the same blow-ring filtering velocities at these loads. The cages were based on available designs from shipping pulverizer shafts. The pulse valves selected were diaphragm valves that were the fastest and the lowest cost valve available. This valve happened to be a ¾ inch diaphragm pilot operated valve. They decided to use several valves in a collector and pulse them with an electronic timer. It was found the hole sizes and venturi formed an air ejector design that had the same jet velocity that the blow-ring collector was using. But the big breakthrough came with the realization that the dust was ejected from the bag during the first 4 or 5 milliseconds of the valve opening. The valves were operated as fast as the mechanical design allowed. The operation was completed in less than 0.10 seconds. It became apparent that the frequency of cleaning was a function of the load to the collector. For instance for loadings of 300 grains the collectors would operate at a filtering velocity of between 7 and 9 ft per minute. At material handling facilities such as quarries, the collector would run at velocities of 14 to16 feet per minute. The typical pressure drop in these collector designs were about 3.5 inches water gauge pressure for the high loads and 2.0 for the lower dust loads. The typical compressed air usage on the high loads were 1 to 2 SCFM per 1000 CFM of filtered air. For loads under 10 grains per cubic foot, the air usage was 0.2 to 0.8 SCFM per 1000 CFM of filtered air.

Determining the filter velocity (then referred to as filter ratio) became a rather complicated procedure. The ratio presumably was determined by dust load, fineness of the dust, temperature of process gas stream, and other factors.

The hopper inlet was a carry over design from both the blow-ring collector and the previous mechanical shaker collectors.

By 1969, there were over 10,000 collectors in operation. Almost all of them were installed on process exhaust from Pulverizers or in foundries. Pulverzing Machinery changed their name to Mikropul and licensed FlexKleen to also build and Market collectors. The collectors for MikroPul had 4 ½ inch diameter bags 72 inch long and the FlexKleen units had 5 inch bags 102 inches long. Bag life was 3-5 years on Pulverizer applications and over eight years on low loading applications.

Engineering Disaster 1971

In 1971, the patent was challenged and the Pulverizing Machinery patent was declared invalid. The market changed radically because Air Pollution Control Regulations also became effective at the same time. Many new suppliers entered the market. In order to compete, Mikropul changed their design. They went from 6 foot to 10 foot bags. They increased their pulse pipe holes by the same ratio. The whole industry followed and copied the new design for hole size and venturi throat diameter. At the time, Mikropul had 40,000 venturies in stock and kept the same venturi sizes. This increased the jet velocity of the cleaning jet by 66 per cent.

This was when the dust collector market was growing at a 20% annual rate. With the new designs:
(1) pressure drop increased to 4 ½ to 6 ½ inches w.c..
(2) Compressed air consumption increased by over 50% for similar applications.
(3) Bag life was reduced by over 50%.
(4) In reaction to these problems the filter ratios were reduced to between 4 & 6 on almost all applications.

Reasons for Disaster

What happened was no one at that time realized what might have been a rather obvious truth, that the velocity with which the dust is ejected from the bag during cleaning is proportional to the velocity of the cleaning jet. At the new velocities, dust is driven toward adjacent rows of bags in the filter mode. Depending on the dust density, the dust will be driven through the adjoining cake into the clean side of the bags. The cake becomes more dense and the pressure drop increases until the process stabilizes which takes 16-100 hours. Even after the equilibrium, the dust still penetrates and bag wear is high. With low filter ratios it takes longer for the bag to wear out and require longer times between replacements.

Today’s Conditions

This disastrous design continues to be employed by most of the pulse jet collector suppliers in the world.

New Technology eliminates design flaws

Twenty-four years ago a new technology was developed, a new pulse jet collector that basically changed the cleaning system design. The key to this design was to change the jet velocity to a fraction of the existing designs. New Technology eliminated the penetration of dusts from the row of cleaning bags to the adjoining row in a filtering mode.

This allowed pulse jet collectors to operate at:
(1) lower pressure drops (1- 3 inches w.c.),
(2) lower air consumption (50-75% less)
(3) 3 to 4 times longer bag life
(4) filter ratios of over 14 : 1 on any application
(5) decrease dust penetration by up to 90%.

There have been several suppliers building and selling these New Technology collectors since 1982. In fact the patents have now expired. There are over 4000 installations worldwide.

WHY IS THIS NEW TECHNOLOGY NOT ACCEPTED BY ALL THE MAJOR SUPPLIERS?

1) If you produced 40,000 collectors after the development of the new technology was published over 20 years ago, you might be subject to legal action for poor judgment and causing the public to be overcharged for their dust collection.
2) They do not have the engineering expertise to build these new technology collectors.
3) People using the old obsolete technology control over 90% of the market world-wide.
4) The suppliers of valves and filter elements would have their markets cut in half.
5) Air compressor sales and service for pulse jet collectors would be cut by 60%

MODIFYING EXISTING COLLECTORS WITH ALMOST NO RISK TO THE PURCHASER.

We can supply new bags, pulse pipes and bag plugs to alter performance to high technology low pressure drop, reduced air consumption, lower penetration (immediately noticeable) and long bag life (it takes some time to verify that but it should be obvious from the other indications). The modifications take only a few hours and if a customer is not satisfied, he can return pipes and cages for credit and re-install the old components.

If this was not an absolute certainty customers would not pay for the equipment.

For more information go to website: http://www.qamanage.com/

Static Electricity and Dust Collector Systems

General Considerations
The effects of static electricity on the collection of dry particulate in fabric collectors is rather simple but misunderstood. For the most part, cartridge dust collectors experience the same issues.
First we must consider the cause of static charge build up in a collector. It occurs because the dust being collected is akin to a capacitor in an electronic circuit. In this day of computer chips the designer may not be familiar with this phenomenon. The capacity has two conductive plates separated by a layer of insulating material that has high enough insulation values that the static charge remains for relatively long periods. The charge can be removed by grounding one side of the capacitor. The charges then drain.
In dust collectors where the dust forms in the filter cake, the static charges may enter the collector on the surface of dry particulate dust. If the dust has high dielectric resistance properties, it can accumulate and build up in the filter cake. It can be viewed as many particles each carrying a static charge and acting like a miniature capacitor. The static charge will then build up on the surfaces and may reach a high enough level where a spark can be produced. This spark can trigger the explosion of explosive dusts.

Mechanical Cleaning (Shaker) Dust Collectors
In a fabric collector with a mechanical shaking mechanism to remove the dust, the collector is most vulnerable during the cleaning process. The dust is shaken from the filter bags in the process of shaking the cake, sparks sometimes are produced. Invariably, the dust/ gas mixture passes between the upper and lower explosive limits. A serious explosion may occur.
Usually these collectors will have explosion vents which relieve the high pressures that are generated in an explosion, presumably keeping the housing from being damaged and protecting the operating personnel near the dust collector.
In an attempt to keep this static charge from building to threatening levels, measures are included in an attempt to bleed this charge to ground. These include one or more of the following:
1) Sewing in grounding wires into the filter media.
2) Impregnating carbon or other conductive coating into the filter cloth.
These often give the designer a false sense of security in applying these to dust collectors. As explained above the dust, itself, insulates the charge and it remains in the cake until it reaches a point where a spark is generated. If the dust concentration is above the lower explosive limit and below the upper explosive limit, an explosion can occur. Fortunately, generation of the spark may not occur if the timing of the spark and dust concentration level do not coincide. An explosion does not occur in these cases.

Continuous Cleaning Reverse Jet Pulsed Dust Collectors
When dust, with the same properties described above, is vented in the same operations, using a reverse pulse jet cleaning system, the danger is considerably diminished unless the pulsing is applied in “off line” cleaning mode where the fan is stopped.
These collectors clean the bags by injecting air from the clean air plenum backwards through individual bags as the flow continues through the collector. This cleaning agitates the filter cake so the static charges are dissipated.
The danger of explosion occurs when the dust concentration coming into the collector reaches a level between the lower and upper explosive limit concentrations. This is highly unlikely but we recommend that properly sized explosion vents are installed which normally coincides with the requirements of insurance underwriting firms.
The explosions can occur when there is dust build up in ducts especially when long horizontal runs are encountered. The spark can be generated in ducts and the explosion front can travel down the duct into the dust collector, igniting a secondary explosion as the concentration in the collector housing is driven above the lower explosive limit for that dust. Even with no build up in the ductwork, an upset can occur in the process which generates sufficient dust concentrations.
One method of nullifying the possibilities of danger due to duct build up is to install an automatic booster / duct cleaner device (www.qamanage.com/products/Booster.htm) . This booster can serve to automatically clean out any drop out in long horizontal duct runs.
Another phenomenon can affect of dust collector systems, is where the dust has high dielectric properties and the dust, because of static charges, will build up on the outside bend of an elbow. This dust can trigger an explosion if this dust is also flammable and explosive. Some examples of dust where this problem is often a factor are toners for copy machines and electrolyte powder used in alkaline batteries. The solution is to insert a pulsed air jet that agitates the built up dust that dissipates the charge. Some dry powder coating compounds are also subject to static charge build up in powder coating systems.

For more information see these web-pages:

Booster / Duct Cleaner; www.qamanage.com/products/Booster.htm

Quencher spark arrestor; www.qamanage.com/products/quencher_spark_arrestor.htm

Spark Arresters & Coolers

There are several approaches to the issue of extinguishing sparks in a gas stream.

Liquid Spray Systems.
For many years these systems were the only available systems to prevent fires caused by sparks. The system consists of electronic detectors that detect sparks and react to their presence. When a spark is detected liquid sprays are actuated and water sprayed into the duct. The sprays actually cool the gas stream below the dew point. However, in dust collection systems, the water then wets the filter bags or cartridges. This prevents fires but the gas flow is interrupted and the bags must be either replaced or dried out before the process can resume. The detector sensitivity can be lowered to prevent excessive actuations, but, this reduces the reliability of the systems. The detector missing a spark is an ever present danger and a fire may occur. Bag or cartridge replacement is definitely required.

Static Blade Spark Suppressor (Tri Pass)
These were developed in Japan to replace multiple cyclones in Coal fired boilers. They found that the multiple cyclones did not stop sparks from entering the dust collectors. The first ones were installed in the early 70’s. They ran at 1.5 inches of pressure drop and were fabricated from structure angles to resist the wear of the abrasive ashes in the coal that they fired. There are several of these applications installed in the USA designed by one of our colleagues.

Cyclone Dust Collectors
Contrary to common belief Cyclones are not effective spark arrestors. For a spark arrester/cooler to work, there must be turbulence to be effective. If you have turbulence in a cyclone pressure drop is very high. They are designed to avoid turbulence. Many bag house fires occur in systems with cyclone pre-cleaners. Amazingly the inlet baffles on the baghouse are more effective as spark arrestors, however they are not foolproof.

Static Baffle-Box Spark Arrestor
Many dust collector suppliers offer this type. It consists of air entering at one end of a baffle box running over a baffle plate which drops out the sparks and much of the dust collected. The air exits at the other end, and then travels to the dust collector. The big drawback is that a hopper and flexible or solid hose connection to a collection barrel is required. Also, these devices do not eliminate all of the sparks. There is not enough turbulence generated to ensure hundred percent spark arrestance. Sparks may ignite the contents of the collection bin

Mesh Filters
This is a common stop-gap measure where the filter is placed at the exhaust duct of hoods or installed in the ductwork. When clean, the mesh filter will stop at best 80% of sparks. These filters do not produce enough pressure drop to be fully effective. It only takes one spark to ignite dust in the duct or set a dust collector on fire. The only thing these filters do is clog up and add to your maintenance.

Blender Type Air Mixers
A number of these air blender/mixers have been applied successfully as spark coolers and suppressors. Over the last 5-6 years standard air mixers have been adapted and applied between the spark generating process and dust collector. They were applied in processes where fires in the dust collectors had previously occurred. One supplier hired a consultant to develop a market for these air blender/mixers as a spark arrestor/cooler. This blender design was an outgrowth of mixing two gas streams of different temperatures to insure a uniform temperature after the static mixer. It was deduced that the gas stream produced turbulent flow as it passed through the blades and this was the reason it could be adapted to spark cooling. However, these are air mixers first and spark arrestors second. There are performance limitations because not enough turbulence is imparted to the spark ember.

Improved Spark Arresters
QAM developed the QUENCHER, which is a variation of the blender/mixer design. Employing a 60 year old spin vane mist eliminator technology developed by Sly Manufacturing in the early 1960’s, led QAM to vary the blade designs to have the most effective performance, inducing maximum turbulence to the gas stream, and lowering the cost. Maximum turbulence is the key to spark arrestance. After several tests it was found that the air blender/mixer design did not impart enough turbulence and some sparks got through, especially at low gas stream velocities. Eventually, there was a specific design which imparted the most effective swirling and turbulence thereby extinguishing the sparks quickly and most effectively. In fact, during testing of the QUENCHER, the arrestor cell would light up as a ball of fire, however, one inch past the cell nothing was left in the gas stream. These designs were incorporated into the QUENCHER. QAM has developed special application data in which the blade angles are adjusted to produce minimum pressure drop for different temperatures and gas densities. To our knowledge, no one else accounts for the gas density effects on spark arresters. In truth, due to the advanced design, even applying the incorrect parameters to a QUENCHER may not result in a failure to put out sparks. Since the pressure drop across the blender and mixer are a function of the velocity through the device, the development of a pneumatically operated booster was introduced to prevent dust dropout accumulating in the static blender/mixer. It also blows out accumulations on the blades.

Important Factors in Spark Arrester Selection
(1) Pressure drop across QUENCHER style of unit is a function of the Reynolds number which is proportional to the density for air. This means that a unit can be sized smaller if operating at a higher temperature. For instance a suppressor operating at 440 degreesF is 2/3 the size of the typical unit applied at 70 degreesF and the pressure drop will be designed the same. This lowers the cost of the suppressor. The density is also affected by the water vapor in the gas stream. It has little effect at temperatures below 125oF but can be a major factor when operating at higher temperatures.
(2) If the gas steam has dust that might drop out in the duct at the velocities in the blender style or QUENCHER suppressor, a booster must be provided to periodically remove this accumulation. If this unit is not kept clean it might pose a threat by putting an extra load on the ductwork. Without an automatic booster system, the suppressor might require periodic manual cleaning.
(3) The booster design is also temperature sensitive and must be altered to accommodate changing gas steam conditions. Most suppliers do not have the capability to modify these booster designs.

We trust that the above information will enable you to evaluate and select the most suitable method and supplier for your application. Buying our QUENCHER/BOOSTER combination will give you a risk free unit, fine tuned for each application.

Dust Collector Application Evaluation

The design of dust collection systems is complex and few people truely understand it. The designer must have a clear picture of what he (she) is dealing with. A good starting point is to use an "application evaluation" similar to the one presented here.

Client Company:________________________________________________________
Installation Address:____________________________________________________________
Person Responsible for project: _____________________________________________
Project Reference:______________________________________________________
Process Description: ____________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
Type of dust:Generic description____________________________________________
Chemical Name (s)___________________________________________________
Dust properties:__ Granular __ Sticky __ Fine powder__ Free Flowing __ Fibers __ Coarse__ Hygroscopic absorbs moisture __ Combustible __ Stringy__ Flammable __ Contains irregular non granular pieces__ Contains liquid__ Other properties___________________________ Bulk Density in Pounds per cubic foot ________________Size Range in Microns_________
Inlet Loading in pounds per minute or grains per cubic foot___________________Variation in loading: Maximum Load in 5 minute period ___________________
Operation: Continuous_________8 hrs /day _____Other____________
Gas:Air________ Other Gas(es)___________________________________________
Water Vapor _______________________________________________________
Free Moisture Present : Yes_________ No____________Oil Mist: Loading____________
Compressed air available : _________ SCFM Pressure in Psig ______
Type of Air Dryer installed____________

History: Has dust collector been installed on this process before ?
Cyclone;_________ Air Volume____________ Manufacturer and Model______________
Shaker Collector;________ Sq. ft. of media __________ Air Volume______________
Type of filter media ____________________ Manufacturer and Model______________
Pulse Jet; _____________ Sq. ft. of media __________Air Volume__________________
Type of filter media ____________________ Manufacturer and Model______________
Cartridge Collector;_______Sq. ft. of media ____________ Air Volume_______________
Type of filter media _____________________ Manufacturer and Model______________

Description of system:
Operations that are vented e.g. grinding, welding, transfer points, sanding, foundry shake out,etc
1 Operation__________ CFM at Pickup________
2 Operation__________ CFM at Pickup________
3 Operation__________ CFM at Pickup________
4 Operation__________ CFM at Pickup________
5 Operation__________ CFM at Pickup________
6 Operation__________ CFM at Pickup________
7 Operation__________ CFM at Pickup________
8 Operation__________ CFM at Pickup________
9 Operation__________ CFM at Pickup________
10 Operation__________ CFM at Pickup________
Design Volume in CFM______________________
Pressure drop in system in inches of water column__________
Temperature Degrees F (Range)____________Dew Point Degrees F_____________
Size of pipe connection to dust collector_______________(pipe size)
Insulated housing (yes or no)____________
Location of collector (indoors or outdoors)____________
Comments__________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
For a printable copy of this "application evaluation", click here and use the link on that web page.

Are you interested in free correspondence course on advanced technology in dust collection systems, click here