ISO certified unit in India that manufactures of Strainer
ISO certified unit in India that manufactures of Strainer
A bag type filter (also called a bag filter housing) is a filtration system that uses a replaceable fabric or mesh filter bag to remove solid particles from liquids. It is widely used in industries where high dirt-holding capacity and easy maintenance are required.
Fluid enters the housing and flows inside-to-outside (most common design).
Contaminants are trapped inside the filter bag, while clean fluid exits through the outlet.
? High efficiency filtration
? Low pressure drop (when clean)
? Easy bag replacement
Bag filters are classified based on design and application:
• Single Bag Filter Housing – For low to moderate flow rates
• Multi-Bag Filter Housing – For high flow applications
• Duplex Bag Filters – For continuous operation (no shutdown)
• Top Entry Bag Filters – Easy maintenance
• Side Entry Bag Filters – Cost-effective option
Bag filters are available in a wide range of filtration ratings:
• 1 micron to 1000 microns
• Common selections:
o 1–10 micron ? Fine filtration
o 25–100 micron ? General industrial use
o 200+ micron ? Coarse filtration
Filter bags are made from different materials depending on fluid compatibility:
• Polypropylene (PP)
• Polyester
• Nylon
• PTFE (Teflon)
• Nomex (high temperature)
? Chemical resistance
? Temperature compatibility
? Long service life
Bag filters are widely used in:
• Oil & gas processing
• Chemical and petrochemical plants
• Water treatment systems
• Food & beverage processing
• Pharmaceutical industries
• Paints, inks, and coatings
• High dirt holding capacity
• Low operating cost
• Simple design and operation
• Easy maintenance (quick bag change)
• Wide range of micron ratings
• Compact and space'saving
Selection depends on:
• Flow rate (m³/hr)
• Fluid type (viscosity, density)
• Required micron rating
• Operating pressure & temperature
• Dirt load
? Oversizing is recommended to reduce pressure drop and increase bag life.
• Clean condition: 0.1 – 0.3 bar
• Dirty condition: up to 1.0 – 2.5 bar (change-out point)
? Replace the bag when differential pressure rises significantly.
Replacement depends on:
• Contamination level
• Flow rate
• Micron rating
Typical frequency:
• Daily (heavy contamination)
• Weekly or monthly (normal operation)
Yes. Multi-bag filter housings can handle:
• Up to 1000+ m³/hr depending on design
? Ideal for large industrial pipelines
Common industry'standard sizes:
• Size #1 ? ~7” dia × 16” length
• Size #2 ? ~7” dia × 32” length (most widely used)
• Stainless Steel (SS304 / SS316 / SS316L)
• Carbon Steel
• FRP / Plastic (for corrosive applications)
Yes, depending on bag material:
• Polypropylene ? up to ~90°C
• Polyester ? up to ~150°C
• Nomex/PTFE ? up to ~200–260°C
Top Entry >> Better sealing, no bypass
Side Entry >> Lower cost, compact design
Yes. Bag filters are suitable for high-viscosity fluids like:
• Oils
• Resins
• Syrups
• Paints
? Larger surface area reduces clogging
Industrial bag filters are designed as per:
• ASME Section VIII
• ANSI / ASME B16.5 (flanges)
• PED (for Europe)
• ? Bag clogging ? due to high dirt load
• ? High pressure drop ? undersized filter
• ? Bag bypass ? improper sealing
• ? Short bag life ? wrong material selection
? Use correct micron rating
? Select proper bag material
? Ensure proper sealing
? Use pre-filtration (if needed)
? Monitor differential pressure regularly
