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A good Sales Engineer will review with you the factors that make a Top Load or a Bottom Load system a better choice but in general, Top Load and Bottom Load systems have specific Pros and Cons. This Tech Note lists Pros and Cons of each system to help you make a better informed decision on which style is right for your company and application.
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Main Number - 315-451-5300
Sales Engineering – 315-444-2908
Adapted from: Reigel and Applewhite 1980; McKenna and Greiner 1982.
The Differential Pressure reading between the “dirty” side and the “clean” side of the baghouse can provide a great deal of information regarding how well your baghouse is working and the health of your filters.
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It is always a good idea to monitor differential pressure and develop a baseline differential profile for your baghouse. Future readings within the baseline pressure reading profile will be a good indication the baghouse is operating properly.
The differential pressure readings are also useful in monitoring the condition of the filters. As the differential pressure rises above the clean filter baseline after a cleaning, you know the filter material is starting to become clogged with dust. As the pressure rises to 8” WG or higher, the filters are considered blinded and it is time to replace the bags.
The differential pressure can also indicate a catastrophic filter failure or the presence of worn and torn filters. If differential pressure readings drop below the clean filter baseline pressure reading and starts heading towards Zero, you can suspect there is a system failure. It is time to check for a filter which has fallen out of place or for filters with holes and tears or a complete blowout.
At Griffin Filters, we recommend operating between 2” WG and 6” WG. This considered the normal operating range.
With new filters in the baghouse, reading can be less than 2” WG but once conditioned and a dust cake is formed, the readings on a clean bag should be around 2” WG. Dust cake is a good thing. A filter with a good dust cake is more efficient in capturing dust than a brand new clean filter. The layer of dust prevents new dust entering the baghouse from migrating through the filter material and out of the baghouse on the “clean” side.
At 6” WG, Griffin Filters recommends running the cleaning cycle. Continuing to operate the baghouse at 6” WG and higher forces dust into the filter material. This causes the bags to “blind-over”. The filter material becomes clogged with dust and no longer allows air to pass through the filter material properly.
Monitoring the differential pressure after a cleaning is important. Pressure readings that rise above 6” and towards 8” WG after a cleaning is a strong indication that the filters are reaching the end of their useful life and the baghouse will require maintenance in terms of filter replacement or filter reconditioning. At differential pressure reading between 6” and 8” WG, your system will be running hard. Energy consumption will go up as the fan will be working harder to pull air through the high resistance caused by the blinded filters and the frequency of the cleaning cycles will increase to the point of continuous cleaning. Sooner, the better applies here. The sooner the filters are replaced when the differential pressure of the system is at 6” WG or higher, the better it is for protecting your baghouse from additional component failure.
A magnehelic gauge is provided to monitor the static differential pressure across the bags.
Note: Differential pressure will vary with application. During the initial start-up, the differential pressure could be lower than normal, as the filter media is new and quite porous. The high initial porosity could also be evidenced by visual emissions at the exhaust stack until dust cake is formed on the bags.
106 Metropolitan Park Drive
Liverpool, NY 13088
Main Number - 315-451-5300
Sales Engineering – 315-444-2908
We are proud to announce that we will be exhibiting at the 2015 International Biomass Conference & Expo, the largest gathering of biomass professionals in North America. Visit us April 20 – 22, 2015 at booth 730 to discuss our latest biomass dust collection projects, designs and everything else dust related.
We look forward to seeing you there!
International Biomass Conference & Expo
Minneapolis Convention Center
April 20-22, 2015
Which is better—a Baghouse or a Cartridge Dust Collector? There are many strong opinions and compelling arguments, largely driven by the success or failure of installed projects. As one would expect, the answer boils down to good applied application knowledge as both technologies have pros and cons. While every application can have its own list of unique or special challenges, we recommend the following guidelines be considered:
Knowledge of your application is paramount to providing an optimal filtration system. If the collected particulate is sticky, tacky or has any agglomeration characteristics which allows it to adhere to itself, a cartridge collector will operate very poorly. When the pulse cleaning mechanism engages a cartridge, the pleated “peaks & valleys” do not expand like a filter bag. Instead, they collapse in on themselves. When this occurs with a very sticky application, the collected particulate will be pressed into the internal valley of the cartridge pleat. If this material does not release and drop out, that portion of the filter area is effectively blinded over which puts more demand on the remaining effective filter area. Under these conditions, the differential pressure of the system will increase, resulting in either higher power consumption of the system fan or fan overload and failure.
Should the unit incorporate an inlet located in the hopper or elevated near the top of the dirty air plenum as a high entry inlet? Surprisingly, the location of dirty inlet on a cartridge collector does have an impact on the effective operation of the unit. Consider the following:
A cartridge collector will incorporate a smaller vessel. This is a trademark advantage of this style of unit; optimal filtration in a smaller and more compact package. However, the internal velocities play a significant role in the effective operation of the filtration process. There are two terms for the measured velocity inside a baghouse: Can velocity is the upward air velocity below the bottom of the filters. Interstitial velocity is the upward air velocity between the filters. If the interstitial velocity is too high, the dust will stay in suspension and not drop into the hopper. If the dust stays in suspension, it will gravitate to the filters and ultimately penetrate and blind them over, causing a high differential upset condition which can only be corrected by changing the filters.
There are several solutions which can offset this upset condition:
With the closing of plants in the recent past and scaling back of manufacturing there is a lot of used pollution control equipment proliferating the industry. From a first look, buying used equipment looks like a great deal. Saving on capital expenditure along with a quick delivery to resolve an air pollution issue is very enticing. You may discover what appears to be a suitable baghouse for your application, BUT here are some questions that you need to take into consideration before you write the check and take delivery:
If the answers to the above questions are satisfactory, then you may have discovered a cost effective solution for your application.
However, if the answers are not satisfactory with concerns the equipment being considered will not meet your application requirements, we submit the additional time, capital resources and logistics to bring this unit in compliance will almost certainly exceed the cost of a new system.
Additionally, if your application requires compliance with an EPA performance guaranty to meet a specific particle emission (PM) limit, this can only be provided by an original equipment manufacturer. Future fines/ court actions and legal fees can cost much more than the savings initially accrued.
When buying a new dust collector, the equipment is manufactured to your specifications and properly sized, yielding the maximum particulate collection at the lowest operating costs.
To arrive at the proper collector design, the proper sequence of steps should include:
Selecting the correct air-to-cloth ratio for the application is one key design factor.
Equipment properly designed for the specific application.
Equipment guaranteed to meet regulations.
Full factory warranty.
Maintenance cost and potential downtime are minimal because you are starting with all new components.
LIVERPOOL, N.Y., Oct. 1, 2014 -- Griffin Filters, a subsidiary of Cemtrex Inc., announced today that they have seen a growing demand for industrial air filtration directly attributable to the oil and gas boom currently taking place in the United States due to hydraulic fracturing technologies.
Some studies estimate that the Hydraulic Fracturing proppants industry will continue to grow at 8-9% per year. According to a Morningstar report, the United States is still by far the largest supplier of premium sand with 30 million tons currently used per year and 3.5 million tons in Canada with the market expecting double-digit growth in 2014. The growing demand for silica sand and proppants has resulted in supply shortages and logistical challenges.
The processing of the frac sand results in air pollution, including post wash drying of the sand, screening, loading and unloading of railcars, barges and trucks. The silica and fugitive dust particulate emissions are controlled by the high efficiency proprietary baghouse filters which Griffin Filters provides for maximum control. Griffin bag filters decrease safety concerns for the operators of the frac sand trucks through elimination of dusty, hazardous breathing conditions. Griffin Filters has seen that the frac sand mining industry along with the logistics trans-load points as a major growth area for its baghouse filters.
CEO of Griffin Filters, Saagar Govil, commented, "After receiving several significant orders and now with increasing inquiries in this market we see this as a strong market for the next few years as the oil & gas boom continues in the US. With strong relationships with many customers in this space and a considerable history of providing durable, efficient industrial air filtration systems we are confident we can grow in this space."
Safe Harbor Statement
This press release contains forward-looking statements. Actual results could differ materially from those projected in the forward-looking statements as a result of a number of risks and uncertainties. Statements made herein are as of the date of this press release and should not be relied upon as of any subsequent date.
For further information, please contact:
Contact: Saagar Govil
One of our customers needed a new baghouse system to replace a 30-year-old undersized unit for their Calciner (rotary kiln) operation.
To suit our customer's needs, Griffin's application engineers designed an insulated multi-module baghouse system, including (5) of our model JA-272-E baghouse modules. The baghouse system includes:
Read the case study for more information.
Last year, OSHA proposed to toughen the rules against Crystalline Silica dusts in the workplace. According to OSHA's, crystalline silica exposure puts workers at greater risk for several deseases, including silicosis, chronic obstructive pulmonary disease and kidney disease. The proposed ruling would require businesses to implement tougher measurements against respirable silica dust in the workplace.
The ruling will have an large impact on many companies, including those in both the construction and metalcasting industries. At Griffin, we are keeping a close eye on this proposed rule's progress to ensure our customers will be ready if it passes.
Let us know if you have any questions about your current dust collection systems and how the rule will affect your operation.
OSHA's Proposed Crystalline Silica Rule: Overview
OSHA's Rulemaking on Crystalline Silica
OSHA's Proposed Rule: Construction Industry
Crystalline Silica Resource Page (American Foundry Society)
We're proud to announce that we will be exhibiting at the 2014 Powder & Bulk Solids Conference & Exhibition, a premier tradeshow for the process industry's finest products and companies. Visit us May 6-8, 2014 at booth 2844 to discuss our latest projects, designs, and everything else dust related.
We'll see you there!
International Powder & Bulk Solids Conference & Exhibition
Donald E. Stephens Convention Center
May 6 – 8
See the full sized map here.