Nordstone | Bag Filter Vessel

Bag Filter Vessel – Efficient Industrial Liquid Filtration Systems

Bag Filter Vessels are specialized pressure vessels designed for high-efficiency removal of suspended solids, particulates, and contaminants from liquids in industrial, chemical, petrochemical, water treatment, and environmental applications. They ensure clean, clarified liquids, protection of downstream equipment, and compliance with process quality standards.

At NORDSTONE, we design and manufacture bag filter vessels with robust mechanical construction, optimized flow distribution, and compliance with global standards, including ASME Section VIII Div.1, API, and PED.

What is a Bag Filter Vessel?

A bag filter vessel houses replaceable filter bags that trap particles from the liquid stream as it passes through the vessel. The contaminants are collected in the bag, while the clean liquid exits through the outlet.

Key components include:

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Vertical or horizontal cylindrical vessel

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Bag cage or support basket to hold filter bags

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Inlet and outlet nozzles for process connection

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Top lid with clamp or bolted design for easy bag replacement

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Drain and vent connections

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Manways for inspection and maintenance

These vessels ensure high filtration efficiency, minimal pressure drop, and easy maintenance, making them ideal for continuous industrial processes.

Types of Bag Filter Vessels

1. Single Bag Filter Vessel

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Holds one filter bag

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Compact design for low flow rates or pilot plants

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Easy maintenance and bag replacement

2. Multi-Bag Filter Vessel

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Holds multiple filter bags (2, 4, 6, or more)

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Designed for higher flow rates

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Uniform flow distribution ensures optimal filtration

3. Pressure Bag Filter Vessel

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Designed to operate under high-pressure industrial conditions

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Suitable for chemical, petrochemical, and process water filtration

4. Sanitary Bag Filter Vessel

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Fully hygienic design for pharmaceutical, food, and beverage applications

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Complies with FDA, 3-A, and EHEDG standards

5. Custom Bag Filter Vessel

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Tailored design for specific industrial requirements

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Optimized bag count, vessel size, and flow rate for the application

Key Features of Our Bag Filter Vessels

✔ High Filtration Efficiency

Supports bag filtration from 1 micron to 1000 microns
Removes suspended solids, sediments, and impurities effectively
Minimizes bypass and pressure drop

✔ Robust Mechanical Design

ASME Section VIII Div.1 compliant
API, TEMA, and PED standards adherence
Cylindrical vessel with wind, seismic, and thermal stress analysis
Reinforced nozzles, lid, and support structures

✔ Wide Material Selection

Carbon Steel

SA516 Gr.60/70, SA106 Gr.B

Stainless Steel

SS304/304L, SS316/316L

Duplex / Super Duplex

Stainless Steel

Nickel Alloys

Inconel, Hastelloy, Alloy 20

Special Construction

Lined or coated construction for corrosive or abrasive liquids

✔ Easy Bag Replacement & Maintenance

Quick-opening lid with clamps or bolts
Internal support basket for stable bag positioning
Multiple manways for easy inspection
Lifting lugs and external supports for safe handling

Design & Engineering Considerations

Process Design

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Flow rate, bag size, and micron rating selection

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Pressure drop calculation and flow distribution optimization

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Single-pass or multi-pass filtration design

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Bag life and replacement frequency considerations

Mechanical Design

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Pressure vessel design per ASME Section VIII Div.1

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Wind, seismic, and thermal load analysis

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Support design (skirt, leg, or saddle)

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Nozzle reinforcement, flanges, and lid design

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Compliance with PED, NACE MR0175, and other international standards

Operational Parameters

4-20 bar

Design Pressure

5-80°C

Design Temperature

0.3-2.5 m

Diameter Range

1-5 m

Height Range

All parameters customizable to project-specific requirements

Applications

Industrial Water & Process Filtration

Removal of sediments and suspended solids
Protection of pumps, heat exchangers, and sensitive equipment
Pre-filtration for RO, UF, and membrane systems

Chemical & Petrochemical

Filtration of chemical solutions and solvents
High-pressure and corrosive stream handling
Contaminant removal to prevent downstream equipment fouling

Pharmaceutical & Food & Beverage

Hygienic filtration of process water and liquids
Ensures product safety and compliance with quality standards
Removes fine particulates from beverages, syrups, and pharma fluids

Environmental & Wastewater

Filtration of industrial effluent before discharge or recycling
Removal of suspended solids, sludge, and impurities

Quality Assurance & Testing

All bag filter vessels undergo strict QA/QC:

Hydrostatic

& Pneumatic Testing

Radiographic

Testing (RT)

Ultrasonic

Testing (UT)

Dye Penetrant

Inspection

Magnetic Particle

Inspection

Weld Inspection

& Bag Support Validation

Material

Traceability (MTC)

Third-Party

Inspection (TPI)

Third-Party Inspection Agencies:

TUV BV Lloyds DNV SGS

Optional Features & Packages

Single or multi-bag design

Flexible bag configuration options

Skid-mounted or free-standing configuration

Easy installation and integration

Automatic bag replacement or cleaning systems

Flexible maintenance options

Instrumentation ports

For level, pressure, and flow monitoring

External insulation and corrosion protection

Enhanced durability and protection

FDA-compliant polished internals

For sanitary applications

Why Choose NORDSTONE?

20+ years of expertise in industrial filtration and separation vessels
Advanced process simulation and mechanical design capabilities for optimized bag filtration performance
ASME-certified fabrication for global compliance and international standards
Custom-engineered solutions for bag filtration and process water treatment
Full QA/QC, documentation, and third-party inspection support for complete project traceability
Proven reliability in chemical, petrochemical, environmental, pharmaceutical, and food & beverage industries

Bag Filter Vessel – Filtration & Separation Vessels