Polish Filters provide simple surface filtration for filtering suspended fine solids from liquids, and economically removing trace contaminants: Filter Bags are the primary filtering elements, supported by a Perforated Basket in a sealed Filter Housing

• Filter Housing and Support Baskets are constructed to provide a positive seal between the suspension and the filtrate, while enabling tool-less access and removal of the Bags for regular cleaning / replacement
• Filters Bags can be provided in various pore sizes from  5 to 50 microns, based on the filtration requirement
• Filter Housings can be manufactured in various sizes, with single or multiple bags, as per customer requirements
• Filters can be provided in a twin assembly with changeover valves to ensure continuous filtration from one filter while the other is being cleaned or maintained
• Small pore sizes ensure complete removal of all solids and a clean final filtrate
• Polish Filters have a simple filtration process and are easy to operate and maintain
• Filter Bags can be easily and inexpensively exchanged
• Same filter housings can be used for different purposes by replacing the Filter Bags

Material Of Construction

• Needle Felt or Woven Filter Bags can be manufactured in Polyester, Polyprolypene, Viscose, Nylon, or other special materials depending on the process conditions
• Support Baskets are manufactured in SS316/ SS304 as per customer specification, and can be provided in a fine mesh construction to act as a secondary strainer
• Filter Housings can be manufactured from Carbon Steel, SS304, or Carbon Steel with SS304 lining

Applications

• Polish Filters can be used in Vegetable Oil refineries, Pharmaceuticals manufacturing, and in Chemical industries
• Primary use in Vegetable Oil refineries is for the final polishing of refined oil after de-odorization and before packaging
• Polish filters can also be used to filter bleached oil after the Pressure Leaf Filter, in order to remove trace contaminants before de-odorization

Catalogue | Data Sheet

The filter consists of housing with suitably designed element.  Vessel sizing is based on the required filtration area for the given flow rate and the maximum allowable pressure drop.  Various parameters like viscosity, density, degree of filtration determines the selection of a particular design of element. Instrument Gas Filter consists of a simple cylindrical Cartridge, which rests inside the housing. The Cartridge are fixed into the candle holding plate by means of threading provided at the top cap of the Cartridge. Inline/offline connections are provided depending upon the process requirement.  If required Pressure Gauges are provided at inlet/outlet nozzles to measure the pressure drop across the system.  Vessels are fabricated as per ASME Section VIII, Division A, Lifting lugs, handles, legs and other accessories are provided as per the required mechanical and process design conditions. Cartridge filters are supplied upto 0.1 microns for liquid application and upto 0.01 microns for gas applications. Different materials available for the cartridges are cotton, cellulose, fibre glass, polyester, borosilicate glass fibre, ceramic, sintered SS, bronze. Housings are available in CS, SS, Alloy steel, PP, PFR and other plastic materials as per customer requirements. All fabrication is done in accordance with ASME section VIII. We have also supplied zeta potential electrostatically charged cartridges for impurities like cobalt separation from heavy water in nuclear power industry.   Catalogue

These are used where continuous flow and unassisted cleaning is required. They are designed for installations which will be unattended for extended time periods. It is suitable for remote or difficult service locations. The liquid to be filtered enters through the inlet connection and passes through the specially engineered wedge wire element with the flow being from outside to inside. Solids larger than the selected micron spacing are either retained on the outside of the filter element or drop into the filter chamber sump. The filtered liquid then passes through the top of the element and flows out through the outlet connection. As the filter element becomes progressively fouled by retained solids the differential pressure across the filter rises. Element is cleaned by rotating top handle by manually or by motor and scraper is provided on the surface of the filter element which scrapes out impurities deposited on the element by three or four rotation of element gets cleaned and impurities can be removed by opening drain valve from bottom. Suitable for large volume and fine filtration upto 30 microns available with single or multi elements in Body carbon steel, SS 304, 316, 316L or any other alloy steel material
Catalogue

There are two basic types of water filters: particulate filters and absorptive /reactive filters. Particulate filters exclude particles by size, and absorptive /reactive filters contain a material (medium) that either adsorbs or reacts with a contaminant in water. The principles of absorptive activated carbon filtration are the same as those of any other adsorption material. The contaminant is attracted to and held (adsorbed) on the surface of the carbon particles. The characteristics of the carbon material (particle and pore size, surface area, surface chemistry, etc.) influence the efficiency of adsorption. Working Principle : The pollutants are removed from water through adsorption on the surface of the activated carbon
Capacity/Adequacy : Simple technique using abundant raw material (e.g. petroleum coke, bituminous coal, lignite, wood products, coconut shell or peanut shell).
Performance : Efficient for pollutant having high affinity with activated carbon surface (non-polar compounds).
Costs : Relatively low operation costs. Activated carbon filters are widely used to produce drinking water at household and community level (to remove certain organics, chlorine or radon from drinking water) and to treat industrial or municipal waste waters. It is not efficient for disinfection and nitrates removal.Adsorption on activated carbon is a simple technology based on materials such as fossil fuels (petroleum coke, lignite…) and even agricultural waste (e.g. coconut shell, wood, etc.).
Advantages 

• Easy to install and maintain
• Can be used at the point-of-entry (semi-centralised drinking water treatment plants, wastewater treatment plants) or at the point-of-use (household/community filters)
• Efficient to remove certain organics, chlorine, radon
• Based on materials available everywhere

 Disadvantages 

• Filter has to be replaced regularly
• Skilled labour required, at least occasionally
• Water analysis is required to choose the most adapted type of activated carbon
• Contaminants are separated from water but not destroyed

Catalogue