bag filter sizing calculation

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Liquid Filter Bag Sizing GuideBag Filter Calculation: Sizing Your System for PerformanceJun 5, 2019 To work properly, system designers need to perform a stock filter calculation. So how do you calculate the relationship between the air and the body of your bag filters? Some websites offer simple formulas to estimate the correct relationship between air and body. However, a good designer of the system knows that every application and every material is a little different. Systems designers also make a calculation of compressed air requirements for bag filters. Because without proper cleaning, the bags are covered with dust that eliminates the air-to-body ratio calculated. Therefore, getting these two correct calculations ensures that your bag works with all the efficiency. How to calculate the relationship between air and heat in stock filters A relationship between air and body compares the amount of air passing through a square foot of filter area. If you know the total CFM of the system and know the amount of filter area you have, you can calculate this relationship. For example, if you have 10,000 CFM through your collector and 5,000 square feet of filter area, your relationship is 10,000:5,000. But it's much easier to turn this into a 2:1 relationship. The relationship between air and body can be anything from 1:1 to 3.5:1. What is the difference in the calculation of the bag filter? Often, it is the type of dust that the system collects. Different types of material will change the way you calculate the relationship between air and body in filter bags. Most companies that design bags know the general area of the cloth of their filter bags. You can also calculate the filter bag because the filter bags are round. If you know the diameter of the bag, multiply this diameter in 3.14 to obtain the circumference. (Back to High School Maths and .)Therefore, the circumference of the bags (bag diameter x 3.14) multiplied by the length of the bag will give you an approximate bag surface. There are 144 inches square on a square foot. As the diameter of the bag will be measured in inches, the surface of the bag must also be measured in inches. Use this surface in the air-cloth ratio. Ask the manufacturer first You may never need to know how to make these calculations. Fortunately, many filter bag manufacturers know the general surface of their bags. In addition, a system designer usually knows the surface of the bags that need to go on a collector. What you need to know is why the relationship between surface and air matters. Consequently, an incorrect calculation of the stock filter design can result in a collector with a relationship that causes serious problems. Importance of correct calculations of the relationship between air and heat The correct relationship between air and body determines the efficiency and useful life of your filters. Above all, buying and replacing filters can be the most expensive and consumed part of maintaining the powder collector. The correct calculation of the bag filter extends the useful life of your filters and keeps them working efficiently. Do not have enough cloth for air in your system results in low filter life and damaged or overloaded filters. The different materials will require different air to body ratios. Different applications also require changes in the relationship between air and surface. An ambient system usually filters the air with a low global amount of particles. Instead, a source capture in the plasma court collects much more material. Wood, fiberglass and other materials affect filters differently. Therefore, you should consult with someone who has experience in relationship calculations between air and body for your type of material. Compressed air requirement calculation for bag filters Even if a system has the correct relationship between the air and the body, it still needs to clean the filters properly. For example, some bags are cleaned with airflow from a fan. The fan size will be part of the overall system design. Other bags use compressed air pulses to clean filters. For this, it is important to calculate the requirements of compressed air. The compressed air requirement for bag filters determines how long the bags will last and how efficient they will be. Some compressed air cleaning systems are operated by the timer. This means that compressed air pulses clean the bag filters at a time designed. Dust collectors can also have differential pressure control. In this case, an increase in differential pressure activates a sensor to activate a pulse. The compressed air only presses when the filters need it. This means that the compressed air requirement for the bag is lower. The size of the pipes and valves used can also affect the compressed air. A bag must be operated with the bag filters, valves and other equipment that come with the system, or an appropriate replacement of the manufacturer. The valves and other parts of the compressed air system can develop leaks and waste compressed air. As a result, there will be less efficient pulse. Therefore, systems must be regularly reviewed for any leak or failure valve. The calculation of the compressed air requirement for bag filters is only accurate if the entire system works as it is designed. Read more about bag filters . You also like it. Improve the health, safety and quality of life of people by building the best collectors of dust and smoke on earth" © 2021 • Site by Want to know more about our products? Program a virtual demonstration today!

Read more about Sly Inc. through the blog post below: Dust Collector Fold: What size do you need? A dust collection system is essential for any manufacturing process that creates harmful discomfort or contaminants in a confined environment. A powder collector filters air particles from factory, collects dust for disposal and returns clean air to the environment. Alternatively, dust collector can be an integral part of a dust processing system. If the a is of inappropriate size, the matter of escaped particles can be harmful to the employee's breathing and general health. The dust can obstruct or reduce the efficiency of the factory equipment, and increase maintenance costs. In a process system, an improper-sized dust collector may restrict or limit production rates. When choosing the correct size of the powder collector, it will work at maximum efficiency, improving safety, compliance and overall productivity. Multiple factors need to be considered when selecting a dust collector system. With an understanding of these basic parameters, you will see why your calculation and application to your bag will benefit your process. Determine the correct sized powder collector for your factory provides budget-based investment performance. The three primary calculations to determine the size of the powder collector you need are the air volume, the relationship between air and body and the interstitial speed. Air volume The air volume is the amount of air that will pass through the dust collector for cleaning. This is measured in cubic feet per minute (CFM). CFM determination in HoodsC F M = fpm x area In this calculation, fpm are feet per minute of air speed. Depending on the characteristics of the powder, the correct CFM value should be approximately 100–200 feet per minute of air speed multiplied by the cross-section of the hood in square feet. The precise measurement of the air volume that crosses the baghouse is vital for proper ventilation. Inadequate ventilation can block equipment, create an unsafe working environment and increase problematic environmental emissions. If there are any questions about the correct CFM for your process, contact your professional bag provider. Heat air ratioIn the bag, the cloth filter bags are the work horses in the dust collection process. These filter bags (also known as filter socks or filter tubes) are suspended from a tube sheet in the baghouse. The dirty air passes over or through them (depending on the used bag technology), and the dust adheres to the means of filtration. In a pulse injection collector, bags are automatically cleaned without leakage interruption (line cleaning). The relationship between air and body is the volume of air passing through a square foot of the filtering media. An air-to-body ratio can extend the life of the filter, while a higher-body-to-air ratio could reduce the life of the filter. This relationship should be adapted to specific application conditions for maximum efficiency and filtering life. To calculate the relationship between air and body, divide the volume of air flowing through the input ducts of the powder collector by the total area of the cloth. The importance of the correct relationship between air and body becomes even more evident in interstitial speed. Intersticial Speed Interstitial speed refers to the ascending air movement in the space between filter bags in the dust collector. If the interstitial speed is too high, the powder pressed out of the bag will be re-trained back into the bag instead of falling into the hopper for disposal. This can cause problems, including: To design a powder collector for proper interstitial speed, Benefits of a correct sized bagThe dust collection is an essential and often regulated component of any process that produces dust. Working with a professional supplier of good reputation or OEM will ensure that your air quality goals and dust recovery requirements are met. Its productivity advantages and cost savings with a suitable sized and calibrated baghouse include: A bag that is too large for installation is a waste of resources in terms of cost, footprint and energy. Go too small with your baghouse, and it may seem that you have saved your initial investment, but inefficiencies in the collection could damage your staff, equipment and output. Sly is happy to work with you to get the right sized baghouse. You can or . We hope to help you. hbspt.cta._relativeUrls=true;hbspt.cta.load(2026920, '0d888cb5-4f0d-4793-a05e-21260a76f204', {}); Tags: Subscribe to our BlogObligatory DOWNLOAD THE SLY GENERAL BROCHURESLY LLC – CORPORATE OFFICE8300 Dow Circle, Suite 600 Strongsville, OH 44136© 2020 SLY LLC All rights reserved.

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