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Other Filters

Shreewire’s Leaf Filters 

(Vertical / Horizontal Pressure Type)


Vertical Pressure Leaf Filters


They are used for filtration of liquids with ~7% suspended solids:

  • A Vertical Pressure Leaf Filter consists of a hermetically sealed tank with vertical filter leaves mounted on a central manifold at the bottom
  • Each filter leaf is made from 5 layers of wire mesh – 2 outer filtering layers and 3 inner support layers
  • Outer layers of fine wire mesh are selected depending on the application – these act as the primary filtering elements and eliminate the need for filter cloth
  • Inner layers of coarser mesh support the outer layers and serve to collect and discharge the filtrate
  • Filter cake is discharged from the bottom of the filter using a pneumatic vibrator to shake the leaves
  • Cake discharge outlet is provided with a Butterfly valve that can be pneumatically controlled from a remote location, or with a wedge lock full opening valve with heel leaf
  • Vertical Pressure Leaf Filters are self cleaning and simple to operate without need for repeated opening of the filter body
  • The entire filtration cycle can be easily automated by using a PLC to switch between the priming, filtration, and cleaning steps at regularly timed intervals or based on pressure readings inside the filter



  • Major application of Pressure Leaf Filters is in the filtration of Catalysts, Carbon black, and Bleaching earth in Edible oil processing, Crude oil Bleaching and Post-bleaching, Hydrogenation, Winterisation, and Fractionation
  • Applications in the chemical and process industry include Aluminates, Fatty Acids, Sulphur, Mining, Brine, Resins, Ni Catalyst, and Electrolytes



  • Filtering Mesh is manufactured from SS316L, while the inner meshes and collecting channels of the leaves are manufactured from SS304
  • The housing and support elements can be manufactured from Carbon Steel, SS304, Monel, Inconel, Carbon Steel, etc. based on customer specifications
  • Filters can be provided special linings such as SS304/ SS316L for food grade processes, e.g. in Vegetable Oil refining


Standard Sizes and Designs


Model No Area (m²) Noof Leaves Tank OD (mm) Leaf Height (mm) Leaf Pitch (mm) Cake Volume (ltr)
SWN/VPLF/5/5 5 5 780 920 70 125
SWN/VPLF/10/9 10 9 900 920 70 250
SWN/VPLF/15/9 15  9 1100 1220 70 375
SWN/VPLF/20/11 20  11 1100 1220 70 500
SWN/VPLF/24/11 24 11 1340 1220 70 600
SWN/VPLF/30/15 30 15 1220 1220 70 750





Horizontal Pressure Leaf Filters


They are used in lieu of Vertical Filters, when the filter cake is sticky and difficult to clean automatically:

  • A Horizontal Pressure Leaf Filter consists of a horizontal pressure tank with filter leaves mounted on a central outlet manifold
  • A hydraulic jack is provided to open and retract the horizontal shell cover and / or pull out the leaf assembly, thereby enabling easy access and manual cleaning of the filter leaves
  • Fastening of the horizontal shell cover can be designed with a manual eye-bolt and nut arrangement or with an automatic quick acting Wedge Lock device
  • Horizontal Pressure Leaf Filters can be designed with higher filtration areas as compared to Vertical Pressure Leaf Filters
  • Horizontal Pressure Leaf Filters are especially used for de-waxing of vegetable oils, and similar processes




  • Horizontal pressure leaf filters can be provided in the same design and material specifications as Vertical Pressure Leaf Filters, including Stainless Steel, Carbon Steel, and other materials
  • Filters can be provided special linings such as SS304/ SS316L for food grade processes, e.g. in Vegetable Oil refining





Vertical Type



Catalogue   |   Data Sheet




Horizontal Type



Catalogue   |   Data Sheet


Shreewire’s Polish Filters 




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



  • 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


Standard Sizes and Designs

Model No MOC of Body Body Size (mm) MOC of Bag Pore Size Bag Size (mm) Area (m²)
SWN/SSPF/200/25 SS304 200Ø x 350 Long Non-woven Polyester 160Øx 250 Long 0.125
SWN/SSPF/250/50 SS304 250Ø x 540 Long Non-woven Polyester 185Øx 440 Long 0.250
SWN/SSPF/300/100 SS304 300Ø x 790 Long Non-woven Polyester 235Øx 690 Long 0.500
SWN/CSPF/200/25 Carbon Steel 200Ø x 350 Long Woven Polypropylene 15-20µ 160Øx 250 Long 0.125
SWN/CSPF/250/50 Carbon Steel 250Ø x 540 Long Woven Polypropylene 15-20µ 185Øx 440 Long 0.250
SWN/CSPF/300/100 Carbon Steel 300Ø x 790 Long Woven Polypropylene 15-20µ 235Øx 690 Long 0.500




Catalogue   |   Data Sheet


Shreewire’s Cartridge Filters



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.


Technical Specifications: Cartridge, Candle and Panel Filters upto 0.1 microns for liquid and gas filtration

Size Rating Material of Construction
15 NB to 1500 NB 150#, 300#, 900#, 1500#, 2500# Cast and Fabricated Carbon Steel, Stainless Steel, Alloy Steel, etc.





Catalogue   |   Data Sheet

Shreewire’s Self Cleaning Filters 



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


Technical Specifications :

Size Rating Material of Construction
15 NB to 1000 NB 150#, 300#, 900#, 1500# Carbon Steel, Stainless Steel and Alloy Steel, in welded construction Automatic operation with control panel (relay based, PLC based and start up panel), option of automatic drain valve which can be pneumatic or electrical operated





Catalogue   |   Data Sheet

Shreewire’s Activated Carbon Filters









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.).




  • 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




  • 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   |   Data Sheet