What is Bag Filtration

Bag filtration is one of the most versatile and cost-effective liquid filtration methods used across various industries. It is suitable for multiple applications, from small batch operations to bulk processing.

What Is Bag Filtration?

Bag filtration is the process of capturing solid particles using a filter bag made from fabric or mesh. The filter bag typically sits inside a filter housing, and as the liquid passes through, collects particles are trapped inside the bag while the clean liquid flows out. Depending on the design and material, the filter bag is be replaced upon reaching capacity which is normally determined by a maximum recommended differential pressure across the filter.

This method is ideal for industries requiring either coarse or fine filtration, and various customised solutions are available based on operational demands. The size of the filter bag and the filter media are selected to ensure effective particle removal tailored to the application’s specific needs.

How Does Bag Filtration Work?

  1. Flow Entry: Liquid containing solid particles enters the filter housing.
  2. Filtration: The liquid passes through the filter bag, where particles are captured by surface or depth filtration.
  3. Clean Liquid: Filtered, clean liquid exits through the outlet, ready for further processing.
  4. Bag Replacement: Once the bag reaches its operational capacity, it can be easily replaced to maintain optimal filtration performance.

Bag filter housings are available in various materials and sizes and can handle various fluid types and flow rates from 1 m³/hr to over 300 m³/hr. Replacement filter bags are selected from the broadest possible range of media. The required filter media is determined by the size of the particles to be removed (0.5 – 1500 microns), the type of particles (deformable or non-deformable), the required retention efficiency (60% to >99%), and the chemical and temperature compatibility of the media.

Example applications of Bag Filtration

  • Chemical Processing: The versatility of bag filtration works well in a variety of applications including acids, alkalis, solvents and many others.
  • Food & Beverage: The food and beverage industries require strict quality control. Bag filters ensure that liquids such as food oils, ingredients, beer and many more do not contain contaminants, ensuring a high quality final product.
  • Paints and Coatings : Bag filtration is well established as a go to method for filtration of both industrial and decorative water based and solvent based paints.
  • Automotive Industry: Keeping fluids free from contaminants is critical for automobile manufacturing processes like paints and washing systems. Bag filters remove unwanted particles ultimately to ensure a high-quality surface finish.
  • Water Treatment: Bag filtration is essential in water treatment systems. It helps remove small particles and ensures clean water. Bag filters can be customised to fit different filtering needs.
  • Oil & Gas: In the oil and gas industry, bag filters clean fuels, water, lubricants, and hydraulic fluids.
  • Pharmaceutical: In the pharmaceutical industry, bag filters maintain product purity by removing small particles from API’s, solvents and other liquids used in drug manufacturing.

Choosing the correct Bag Filtration System

When selecting the appropriate filter bag system, various factors must be considered, including the type and size of sediment to be filtered, the flow rate, process temperature, and the liquid’s viscosity.

Allied Filter Systems Ltd. offers various customisable options, ensuring you get the most efficient and cost-effective solution. Whether your priority is maintaining water clarity or removing specific particulates in a chemical application, our filtration experts are ready to help. We also provide bespoke solutions to fully adapt to your operational needs and recommend the best filtration system for your application.

Conclusion

Bag filtration is one of the most effective, flexible, and cost-efficient options across many industries today. Its adaptability and ease of use make it appealing for various applications focused on improved filtration. From simple sediment removal to fine filtration in demanding industrial settings, bag filtration systems can deliver flexibility and high performance.

What Is Bag Filtration?
Scroll to top