Industrial Filtration Technical Glossary

Complete technical glossary covering industrial filtration terms.

This industrial filtration glossary provides technical definitions for filtration systems, filter housings, industrial strainers, filter cartridges, filter bags, and air filtration units used across multiple industries. This reference is designed for engineers, procurement teams, and plant operators.

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Why Industrial Filtration Glossary Matters

Industrial filtration systems involve highly technical terminology that directly impacts system performance, product quality, operational safety, and maintenance planning. A clear understanding of filtration terms such as micron rating, differential pressure, nominal filtration, and absolute filtration is essential for engineers, plant operators, and procurement teams when selecting or maintaining filtration equipment.

In many industries, incorrect interpretation of filtration terminology can lead to improper filter selection, reduced equipment life, higher operational costs, and process contamination risks. A structured industrial filtration glossary helps standardize technical understanding across engineering, operations, purchasing, and maintenance teams, ensuring correct specification and application of filtration systems.

The industrial filtration glossary developed by Praimo Industrial Filters & Spares Manufacturing Company is based on real-world manufacturing knowledge, multi-industry application experience, and practical engineering insights. It serves as a technical reference to support better decision-making in system design, product selection, troubleshooting, and performance optimization.

Key Benefits of Using an Industrial Filtration Glossary

Improves technical understanding of filtration systems and components
Helps select correct filter housings, cartridges, strainers, and filter media
Reduces risk of filtration system failure or process contamination
Supports maintenance and troubleshooting activities
Assists procurement teams in technical product comparison
Enhances cross-team communication using standardized terminology

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Absolute Filtration

Filtration that removes all particles larger than a defined pore size, ensuring precision-grade purity.

Praimo Note: Praimo’s absolute-rated cartridges deliver consistent retention for pharma and semiconductor fluids.

Activated Carbon Filter

A filter using porous carbon media to adsorb chlorine, VOCs, and organic contaminants.

Praimo Note: Used for dechlorination, odor control, and taste enhancement.

Air Filter Element

A component designed to trap airborne dust, fibers, and particulates.

Praimo Note: Panel, pocket, and pleated filters for HVAC and turbines.

ASME Code

Design and safety standard defining pressure vessel construction.

Praimo Note: All housings follow ASME Section VIII Div.1.

Automatic Backwash Filter

Self-cleaning filter that reverses flow to flush contaminants.

Praimo Note: Reduces manual intervention.

Bag Filter Housing

Pressure vessel that holds filter bags for liquid filtration.

Praimo Note: SS, FRP, PP single and multi-bag housings.

Basket Strainer

Strainer that traps debris in a perforated basket.

Praimo Note: Simplex and duplex configurations.

Backwashing

Process that reverses flow to remove trapped solids.

Praimo Note: Extends element life.

Bernoulli Filter

Self-cleaning filter using pressure differential.

Praimo Note: Used in water intake systems.

Bleed Valve

Valve to release trapped air or fluid.

Praimo Note: Standard safety feature.

Cartridge Filter Housing

Pressure vessel for holding filter cartridges.

Praimo Note: SS304, SS316L, FRP, UPVC housings.

Cartridge Filter Element

Cylindrical medium for fine filtration.

Praimo Note: Pleated, sintered, resin bonded types.

Clamping Mechanism

Assembly securing housing cover.

Praimo Note: Quick opening clamps.

Coalescer Filter

Separates immiscible liquids like oil and water.

Praimo Note: Used in oil purification.

Corrosion Resistance

Ability to withstand chemical degradation.

Praimo Note: Uses SS316L and FRP.

Differential Pressure (ΔP)

Pressure drop across filter.

Praimo Note: Used for maintenance planning.

Duplex Filter System

Twin chamber filtration system.

Praimo Note: For continuous operations.

Demister Pad

Wire mesh for mist removal.

Praimo Note: Used in towers and refineries.

Drain Port

Outlet for draining contaminants.

Praimo Note: Standard in all housings.

Dust Collection Filter Cartridge

Cartridge for industrial dust filtration.

Praimo Note: High surface area design.

Electropolishing

An electrochemical process that smoothens stainless-steel surfaces to enhance cleanliness and corrosion resistance.

Praimo Engineering Note: Applied on sanitary and high-purity housings for pharma and biotech clients.

End Cap

The closure component of a filter cartridge that ensures sealing and mechanical support.

Praimo Engineering Note: Available with DOE, SOE, and customized configurations.

Efficiency Rating

Percentage of particles removed at a specified size, expressed as nominal or absolute.

Praimo Engineering Note: Certified using industry-standard test methods.

Epoxy Coating

Corrosion-resistant surface coating for extended service life.

Praimo Engineering Note: Cost-effective for seawater and cooling-water filtration.

Extended Surface Filter

Pleated filter design providing higher surface area.

Praimo Engineering Note: Optimized pleat geometry for long operational cycles.

Face Piping

Arrangement of inlet, outlet, and drain nozzles for ease of connection.

Praimo Engineering Note: Customized to match client P&ID layouts.

Filter Bag

Replaceable porous element for coarse and medium-grade filtration.

Praimo Engineering Note: Felt, mesh, and oil-adsorbing types available.

Filter Cartridge

Cylindrical element used for fine filtration.

Praimo Engineering Note: Available in PP, SS316L, and PTFE materials.

Filter Housing

Pressure vessel enclosing filter elements.

Praimo Engineering Note: ASME Sec VIII Div 1 compliant.

Filter Media

Material through which fluid passes for impurity separation.

Praimo Engineering Note: Selected based on viscosity and particle profile.

Filter Rating

Micron size or efficiency indicating contaminant retention.

Praimo Engineering Note: Available in nominal and absolute ratings.

Filtration Area

Total effective surface available for filtration.

Praimo Engineering Note: Maximized in pleated cartridges.

Flow Rate

Volume of fluid filtered per unit time.

Praimo Engineering Note: Verified through hydraulic modeling.

FRP Housing

Fiberglass-reinforced plastic housing with corrosion resistance.

Praimo Engineering Note: Ideal for seawater and chemical lines.

Gasket

Sealing component preventing leakage.

Praimo Engineering Note: EPDM, Viton, and PTFE options available.

Gas Filtration

Removal of particulates from gaseous streams.

Praimo Engineering Note: Used for nitrogen and instrument-air systems.

Gauge Port

Connection provided for mounting pressure gauges.

Praimo Engineering Note: Dual gauge ports standard.

Graded-Density Filter

Depth cartridge with layered pore structure.

Praimo Engineering Note: Extends service life.

Grounding Lug

Earthing point preventing static buildup.

Praimo Engineering Note: Mandatory for solvent filtration.

Head Plate

Upper portion of housing sealing filter elements.

Praimo Engineering Note: Precision machined for O-ring compression.

High-Flow Filter

Large-diameter cartridge allowing higher flow.

Praimo Engineering Note: 700-series design.

Housing Clamp

Mechanical locking device for housing covers.

Praimo Engineering Note: Swing-bolt and V-band designs.

Hydraulic Filter

Filter element for hydraulic oil systems.

Praimo Engineering Note: Improves servo-valve reliability.

Hydrostatic Test

Pressure test at 1.5× design pressure.

Praimo Engineering Note: Performed with certified gauges.

Hygienic Filter Housing

Sanitary housing with electropolished surfaces for CIP service.

Praimo Engineering Note: Meets FDA and cGMP standards.

Inlet Nozzle

The entry point through which unfiltered fluid enters the housing.

Praimo Engineering Note: Inlet orientation is customized (side, bottom, top) to suit plant piping layout.

Ion-Exchange Filter

A system that removes dissolved ions via ion-exchange resin.

Praimo Engineering Note: Integrated in water-treatment skids for polishing and condensate recovery.

Integrity Test

Verification of filter performance using bubble-point or diffusion-flow methods.

Praimo Engineering Note: Conducted before dispatch for pharmaceutical validation.

Interlocking Clamp

Mechanical lock ensuring cover safety under pressure.

Praimo Engineering Note: Standard on housings above 10 bar.

ISO Certification

International quality compliance standard.

Praimo Engineering Note: Operates under ISO 9001 systems.

Jacketed Filter Housing

Housing with external jacket for heating or cooling fluids.

Praimo Engineering Note: Used for maintaining oil and resin viscosity.

Joint Welding

Joining metal parts via TIG or MIG welding.

Praimo Engineering Note: Uses ASME-approved WPS procedures.

Joint Ring

Sealing ring preventing flange leakage.

Praimo Engineering Note: Standardized O-rings and gaskets.

Knitted Mesh

Interlocked wire fabric used as mist eliminator.

Praimo Engineering Note: Used in refineries and gas scrubbers.

Knife-Edge Seal

Precision-machined edge for tight sealing.

Praimo Engineering Note: Ensures sterile operation.

K-Factor

Constant relating flow and pressure drop.

Praimo Engineering Note: Used for optimum system sizing.

Laminar Flow

Smooth fluid motion with minimal turbulence.

Praimo Engineering Note: Prevents media channeling.

Lenticular Cartridge

Disc-stack cartridge with depth media.

Praimo Engineering Note: Used in food and API manufacturing.

Liquid Filtration

Removal of suspended solids from liquid streams.

Praimo Engineering Note: Covers micro to coarse filtration.

Load Capacity

Quantity of contaminants a filter can hold.

Praimo Engineering Note: Balanced for maintenance cost.

Lug Support

Bracket welded to housings for mounting.

Praimo Engineering Note: Reinforced for vibration stability.

Magnetic Strainer

A strainer using magnetic rods to capture ferrous particles from process fluids.

Praimo Engineering Note: Protects pumps and gearboxes in hydraulic and coolant circuits.

Manifold Assembly

Piping arrangement distributing flow among multiple housings.

Praimo Engineering Note: Custom-fabricated for duplex and parallel systems.

Mesh Size

Number of openings per linear inch in woven wire screens.

Praimo Engineering Note: Available from 10 µm to 5 mm.

Micron Rating

Smallest particle size a filter can remove (µm).

Praimo Engineering Note: From 0.2 µm absolute to 200 µm nominal.

Modular Skid

Self-contained filtration unit with pumps and controls.

Praimo Engineering Note: Factory-tested plug-and-play systems.

Multi-Bag Filter Housing

Housing containing multiple bag elements for large-volume filtration.

Praimo Engineering Note: 3-, 5-, 7-, and 12-bag configurations.

Nominal Filtration

Approximate filtration efficiency (85–90%).

Praimo Engineering Note: Clearly differentiated from absolute rating.

Non-Woven Media

Randomly bonded fiber material for depth filtration.

Praimo Engineering Note: Used in spun-bonded cartridges.

NPT Connection

National Pipe Thread standard for threaded fittings.

Praimo Engineering Note: BSP and NPT options available.

Nutsche Filter

Pressure or vacuum vessel for solid-liquid separation.

Praimo Engineering Note: Used in pharma and specialty chemicals.

Oil Filtration System

System removing moisture, varnish, and particulates from oil.

Praimo Engineering Note: Includes vacuum dehydration and coalescing stages.

O-Ring Seal

Circular elastomer gasket for leak-tight sealing.

Praimo Engineering Note: FDA-grade EPDM, silicone, and Viton available.

Open-Area Ratio

Percentage of screen area available for flow.

Praimo Engineering Note: Optimized for flow and dirt capture balance.

Operating Pressure

Normal working pressure of the filter system.

Praimo Engineering Note: Rated up to 25 bar with safety factors.

Outlet Nozzle

Discharge port for filtered fluid.

Praimo Engineering Note: Precision-aligned for smooth flow.

Passivation

Chemical treatment improving stainless steel corrosion resistance.

Praimo Engineering Note: All SS housings are passivated post fabrication.

Perforated Basket

Metal basket with drilled holes supporting filter media.

Praimo Engineering Note: Available in SS304, SS316L, Duplex 2205.

pH Compatibility

Range of acidity or alkalinity a filter material tolerates.

Praimo Engineering Note: Material selected for long-term stability.

Pilot Valve

Small valve controlling a larger actuated valve.

Praimo Engineering Note: Used in automatic backwash systems.

Pleated Filter

Folded media filter increasing surface area.

Praimo Engineering Note: 3–4× surface area vs non-pleated.

Polishing Filter

Final-stage filter removing fine residual particles.

Praimo Engineering Note: Ensures high clarity output.

Portable Oil Filter Cart

Mobile unit for offline oil filtration.

Praimo Engineering Note: Combines coarse and fine stages.

Positive Sealing

Seal preventing bypass of unfiltered fluid.

Praimo Engineering Note: Precision O-ring grooves used.

Pressure Drop

Reduction in pressure across a filter.

Praimo Engineering Note: Designed for optimal ΔP performance.

Quick-Opening Closure

Mechanism allowing fast access without tools or bolts.

Praimo Engineering Note: Uses swing-bolt or V-band closures for rapid maintenance.

Quality Assurance (QA)

Systematic process ensuring product quality through inspection and testing.

Praimo Engineering Note: Multi-stage QA with full traceability.

Quick-Release Clamp

Tool-less locking mechanism for housing covers.

Praimo Engineering Note: Standard on small cartridge and bag housings.

Resin-Bonded Cartridge

Depth filter made by bonding cellulose fibers with resin.

Praimo Engineering Note: Handles oils and solvents up to 120°C.

Return-Line Filter

Filter installed on hydraulic return lines.

Praimo Engineering Note: Extends component life.

Reverse Flow Cleaning

Method reversing flow to clean filter media.

Praimo Engineering Note: Used in self-cleaning systems.

Rupture Disc

Safety device that bursts at preset pressure.

Praimo Engineering Note: Optional for high-pressure housings.

Run-Off Period

Time between filter cleanings or replacements.

Praimo Engineering Note: Optimized for low OPEX.

Sanitary Clamp

Tri-clamp fitting for food and pharma applications.

Praimo Engineering Note: 316L electropolished fittings used.

Sintered Filter

Rigid porous medium made from bonded metal powders.

Praimo Engineering Note: Reusable with uniform pores.

Simplex Strainer

Single-chamber filtration unit.

Praimo Engineering Note: Cost-effective utility strainers.

Slurry Filtration

Separation of solids from high-solid liquids.

Praimo Engineering Note: Used in mining and pigment plants.

Sock Filter

Flexible tubular filter element.

Praimo Engineering Note: Fits inside basket strainers.

Strainer Basket

Removable screen basket for debris capture.

Praimo Engineering Note: Precision-machined for durability.

Surface Filtration

Particles retained on media surface.

Praimo Engineering Note: Easy cleaning and reuse.

Suspended Solids

Undissolved particles in liquids.

Praimo Engineering Note: Handled from ppm to high mg/L loads.

T-Type Strainer

Pipeline strainer with T-shaped body.

Praimo Engineering Note: Compact welded SS and CS designs.

Temperature Rating

Maximum operating temperature of filter.

Praimo Engineering Note: Up to 200°C for sintered media.

Terminal Pressure Drop

Pressure at which filter is considered spent.

Praimo Engineering Note: Recommended changeout at 1.5 bar ΔP.

Test Certificate (TC)

Document confirming inspection and testing.

Praimo Engineering Note: Supplied with every housing.

Turbidity

Cloudiness in liquids measured in NTU.

Praimo Engineering Note: Reduced below 1 NTU.

Twin-Basket Strainer

Dual-basket strainer for continuous operation.

Praimo Engineering Note: Used in marine and petrochemical lines.

Ultra-Filtration (UF)

Membrane-based filtration removing colloids, bacteria, and macromolecules.

Praimo Engineering Note: Integrated into water-treatment and process skids.

UPVC Filter Housing

Housing made from unplasticized PVC for corrosion resistance.

Praimo Engineering Note: Used in chemical and RO pre-treatment lines.

Unfiltered Side

Inlet compartment before fluid passes through media.

Praimo Engineering Note: Ensures uniform distribution.

Underdrain

Support structure for filter media and flow distribution.

Praimo Engineering Note: Precision-drilled for balanced hydraulics.

Vacuum Dehydration Unit

System removing water and gases from oil under vacuum.

Praimo Engineering Note: Portable dehydration and filtration skid.

Valve Assembly

Set of valves controlling inlet, outlet, and bypass flow.

Praimo Engineering Note: Butterfly valve changeover systems.

Vent Port

Opening for releasing trapped air during startup.

Praimo Engineering Note: SS vent valves standard.

Viton Seal

Fluoro-elastomer gasket with chemical resistance.

Praimo Engineering Note: Used for solvent and oil filtration.

Viscosity

Measurement of fluid resistance to flow.

Praimo Engineering Note: Used for sizing pumps and filters.

Wedge Wire Filter

Filter made of V-shaped wrapped wire.

Praimo Engineering Note: Used in slurry and self-cleaning systems.

Weld Neck Flange

High-pressure flanged welded connection.

Praimo Engineering Note: ANSI and DIN standards supported.

Wet Test

Functional water test for leak detection.

Praimo Engineering Note: Performed before dispatch.

Wire Mesh Filter

Reusable filter made from woven wire cloth.

Praimo Engineering Note: Available in SS304, SS316L, Duplex.

Working Pressure

Maximum safe continuous operating pressure.

Praimo Engineering Note: Rated from 10 to 40 bar.

X-Flow Arrangement

Cross-flow filtration minimizing fouling.

Praimo Engineering Note: Used in membrane and coolant systems.

X-Ray Inspection

Non-destructive weld inspection method.

Praimo Engineering Note: Used for critical pressure vessels.

Y-Type Strainer

A compact pipeline strainer with a Y-shaped body for horizontal or vertical installation.

Praimo Engineering Note: Precision-machined for minimal pressure drop and quick element access.

Yield Strength

The stress at which a material begins to deform plastically under load.

Praimo Engineering Note: Materials selected with adequate yield margins for safe pressure vessel design.

Yellowing Resistance

Ability of polymer materials to withstand UV or heat exposure without discoloration.

Praimo Engineering Note: UV-stabilized FRP and PP housings used for outdoor installations.

Zero-Leak Design

Fabrication approach ensuring leak-free operation through precise welds and sealing geometry.

Praimo Engineering Note: Zero-leak standards maintained across all pressure housings and strainers.

Zeta Potential

Electrostatic charge on particles affecting their stability and filtration behavior.

Praimo Engineering Note: Considered when designing filters for colloidal and electrolyte solutions.

Zone Filtration

Filtration stage division in multi-chamber or multi-layer systems to handle varied contaminant loads.

Praimo Engineering Note: Zone-configured systems improve efficiency and media life.