filter bag 101

Industrial Filter Manufacturing Limited

Liquid Filter Bag Basics

Filter Bags Advantages

Ease of installation

Low cost

Simple to operate

Quick change of the filter bag

Filter Bag technology emerged strong in the 1960’s and 1970’s offering the following advantages:

Versatile across varied industries, applications and operating conditions

Competes and compliments other filter methods

Filter Bag Systems

Open Systems Low pressure or gravity Adaptor Head Filter Bags Tie-on filter bags

Closed Systems Pressurized Housings Pumped fluid Wide range of filter bags

Adaptor Head and Tie-on Filter Bag

Open system No support for the bag Low pressure and low flow rate Usually single pass Minimal capital investment cost

Types of Filter Bags Mesh and Felt Drawstring or clamped bags Adaptor head filter bags

Closed System

Pressurized Filter Bag system

Traditionally uses a pump Includes a pressurized filter housing Accommodates higher flow rate and greater

pressure Single or multiple pass through the filter Side stream or full flow High dirt loading Easy change out system Many bag styles available

Closed Filter Bag System

Made up of three main components:

The filter vessel

The restrainer or support basket

The filter bag

Filter VesselStandard Sizes

Size is determined by understanding the application

Viscosity Flow rate Temperature Pressure Dirt loading Desired Micron retention Micron distribution of contaminate

Vessel TypesSide Entry: Fluid enters vessel through the side

Simple construction Economical Fasten the lid with a band clamp or swing bolts

Vessel TypesTop Entry:Fluid enters the vessel through the top

Lid acts as the hold down mechanism for the bag

Easy change out Better bag sealing

Vessel Types

Duplex

Two separate systems share the same inlet and outlet

Double the filtration capacity by increasing the surface area

Use of isolation valves allow a change-out without interrupting process flow

Vessel TypesMulti Bag

Used in high flow or high dirt applications

Optional inlet and outlet configurations

Many lid constructions available for ease of use

Housing anywhere from 3 to 24 filter bags

Restrainer BasketPerforated or mesh stainless steel construction

Creates a “bypass free” environment A seal is created between

the bag and the basket and the housing

Provides critical support for the bag

Bag can not withstand thepressure and flow without the basket support

Filter Bag

Made up of three basic elements

Filter Media

Retainer

Options

1. Filter Media

Mesh Felt Melt blown micro-fibre Spun bond / point bond Multiple layers of

varying materials

Mesh

Polyester multi-filament

Nylon and Polyester

Surface Filtration

Precise openings

Low fibre migration

Can be washed and reused

Nylon Mono-Filament

Felt

most commonly Polyester and

Polypropylene fibre construction

Depth Filtration

3 Dimensional Filtration

Complex structure creating

a torturous path for dirt

Glaze or Singed Surface

Full Media Product Line

Oil Removal Bags 4 levels of oil removal capability:

POMF, POMB, PSORB, OWS

Extended Felt Thicker Loftier felt

High Efficiency Bags High Efficiency Particle retention

2. Retainers

Zinc plated carbon steel ringStainless steel snap bandStainless Steel RingPlastic FlangePlastic ringDraw StringElastic O-ring

Options and Accessories

Custom Manufacturing

Material Sourcing

Sample replication

Specialty bags

FDA compliance

Silicone Free Certification

Applications where filter bags used?

Potentially anywhere fluid is being processed

Pharmaceutical Automotive Food and beverage Waste and process water Petrochemical Paint and Chemical

Works well in partnership with other filtration methods

Fully welded bag

No needle holes

Eliminates thread issues

Strength equal to other welded bags

Economic manufacturing process

Steel Ring welded bag

Minimal needle holes

Integrated handles

No Lump seam

Economic manufacturing process

Industrial Filter Manufacturing Filter Bags

Competitively Priced

Quality Controlled Manufacturing Process

Consistent Performance

Reliable Deliveries

Focus on customer service and support