Air Pollution Control

Air Pollution Control

Indpro Engineering Systems Pvt. Ltd. has been involved in Air pollution control business (APC) since 2005. During these surpassed years Indpro has more than two hundred installations all over India. Indpro's fabric pulse jet bag filter (dust collectors) are sold as 'SAMAIIR' in the market. The name comes from the Sanskrit word 'SAMAIIR', which means clean and pure air. We offer solutions for various kind of industrial air pollution situations form fugitive dust control to process gas de-dusting , using state-of –art engineering practices & equipments.

Air Pollution Control Can Be Done Through Fabric Dust Collectors, Sintered Element Dust Collectors

Fabric Dust Collectors

Commonly known as bag houses, dust collectors, pulse jet bag filters. Indpro’s fabric dust collectors use filtration to separate dust particulates from dusty gases. They have a feature of continuous operation with a built-in facility for automatic regeneration of filter elements. Today they are the most efficient and cost effective solution, capable of achieving emission levels as low as 5 mg/Nm3.

  • Inertial collection - Dust particles strike the fibers placed perpendicular to the gas-flow direction instead of changing direction with the gas stream.
  • Interception - Particles that do not cross the fluid streamlines come in contact with fibers because of the fiber size.
  • Brownian movement - Submicrometre particles are diffused, increasing the probability of contact between the particles and collecting surfaces.
  • Electrostatic forces - The presence of an electrostatic charge on the particles and the filter can increase dust capture.

A combination of these mechanisms results in formation of the dust cake on the filter, which eventually increases the resistance to gas flow. The filter must be cleaned periodically. Our dust collector uses pulse – jet or pressure – jet cleaning mechanism. This type of mechanism uses a high pressure jet of air (compressed air-induced pulse) to remove dust from the surface of bags. Bags in the bag house compartment are supported internally by rings or metal cages. Bags are held firmly in place at the top by clamps and usually have an enclosed bottom (the bag is sewn closed at the bottom). In another design, a snap ring is sewn into the top of the bag which fits into the tube sheet opening. The cage slides inside the bag and the top of the cage sits on the tube sheet. Dust-laden gas is filtered through the bag, depositing dust on the outside surface of the bag. Pulse-jet cleaning is used for cleaning bags in an exterior filtration system.

Main Highlights of SAMAIIR Fabric Dust Collectors are :

- Easy to install
- Compact and maintenance free
- ON-Line, OFF-Line cleaning types considering the properties of dust to be filtered. Single & multi compartmental construction considering the capacity & on-line maintenance requirements.
- Carbon steel & stainless steel construction depending on the operating & hygiene requirements.
- Outlet emissions can be achieved up to 5 mg/Nm3
- Filter elements fabric material options like Polyester, M- Aramid, PPS, Glass, PP etc. Depending on the gas & dust composition / properties filter fabric options are offered
- Bag removal from top
- Available both in rectangular & cylindrical configurations
- High pressure cylindrical design up to 10 bar
- Suitable designs for explosive dusts.
- Accessories as per client’s request

Application Areas

- Fugitive dust control during bulk solids handling
- Boiler exhaust gas de-dusting
- Dryers
- Various process applications

Sintered Element Dust Collectors

Pulse jet filters using rigid type sinter plate filter Element:
Indpro Engineering Systems in association with Herding Filtertechnik takes you one step ahead in filtration technology. We are proud to announce the launch of Herding Sinter plate filter Elements and dust collector units in India. Herding GmbH Filtertechnik is located in Amberg, Germany and is manufacturer of sinter plate filter elements, dust collector and filter systems for Industrial use. Within a period of more than 30 years the filter specialist Herding® Filtertechnik has developed into a global supplier of complete systems for all sectors of industry. For more information on Herding Filtertechnik, have a look at the website

Dry dust collection, extreme low emission (achievable up to 0.2 mg/m3), compact design, fine dust separation and material recovery are the main focal points of this technology. We provide filtration solutions for Chemical, Detergents and soaps, Food and Food Products, Fertilizers, Pharmaceuticals, Petrochemicals, Paints etc.

As a part of strategic partnership and to provide this technology economically, Indpro imports only filter elements from Herding in Amberg, Germany and rest of the parts are manufactured and assembled in India at our manufacturing setup located at Pirangut near Pune.


Herding has successfully installed hundreds of filter unit in Pharmaceutical industry. Our units find utility in processes as:
- Fluid bed process
- Dosing / Weighing
- Transport
- Mixing
- Granulation
- Sifting
- Palletizing / Compressing
- Coating and packing
- Manufacturing.

Indpro provides complete filter unit along with fan & ducting as applicable. Our ability to provide the complete filtration systems means assurance that industry requirements are met. The solutions are based on Herdings knowledge of specific dusts, various applications for more than 30 years' of experience. As a result

• High potent dust stay captured, if necessary under containment condition.
• Constructive explosion protection measures for filters handling explosive medium.
• Even sticky dust is separated on the filter surfaces.

For more information on this unit, please get the information brochure from our download section.

Dry Capturing of Wet Paint:

We were continuously looking at this application area to remove the use of wet scrubbers and cost consuming effluent treatment plants. Finally we are out with a specially designed process where we are able to capture the over sprays of wet paint from the booth.

A specially developed process protects the filter elements from contact with the paint by adding a filtration additive. This additive is inert, dry, pourable and low cost. A filter cake with only low pressure loss forms even after the filter element have been in use for many hours without being cleaned, and can be removed easily from our filter elements with compressed air using jet pulse process.

Another aspect which is becoming more and more important is to keep the booth air free of dust so as to able to guarantee the required uniform finish quality for the product. This means that the perfect co-ordination of the air within the paint booths provides a great deal of potential for reducing running costs. Advantages :

- Elimination of wet scrubbers and ETP.
- Uniform booth air flow.
- No expensive paint sludge disposal.
- Extremely high separation levels.
- Clean gas dust content < 0.1 mg/m³.
- Constant pressure differentials on the filter elements.
- Secondary filtration stage not required (HEPA Filter).
- Low servicing costs.
- High saving of energy and running costs.
- Fast Amortization of the systems.

For more information on this unit, please get the information brochure from our download section

Welding Fumes Extraction:

Extraction of welding fumes is one of the most difficult applications as the dust contains sticky or oily dust and is difficult to separate. But here we have a solution for you and in order to safely remove this type of dust we insert protection layer of calcium carbonate onto the filter elements. This material is homogenously diffused across the filter element surface and protects the filter against damaging dust components.

Smart Features:
- Outlet dust emissions < 1 mg/m³.
- Reliable and economical extraction of fumes.
- Reduction of fire risk by insertion of non-inflammable calcium carbonate by means of Auto coater.
- Possibility of re-routing the clean air back into production facilities: high saving in heating cost during winter period.

For more information on this unit, please get the information brochure from our download section

Filtration Concept for Detergent Manufacturing:

In detergent manufacturing process dust is generated in various steps like transporting, screening, grading and filling. Dust components includes explosive mixture of zeolites, bleaching agents, surfactants, enzymes, dyestuffs and filler particles – must be extracted and recovered by filter unit and are then returned into the production process. For safety reasons preventive explosion protection is necessary for the total equipment in the process. The minimum floor space available for the filter unit at the planned location requires a compact construction of the filter system with a small footprint.

Herding Dust Filter Units Advantages in production of Detergents:
- Long guaranteed life time of the sinter-plate filter elements of up-to 5 Years.
- Low maintenance.
- Minimization of production downtime.
- Constant pressure drops on a very low level
. - Constant air flow and thus constant process conditions.
- Consistency of < 1 mg/m³, rated as HEPA filter class R (E12).
- Maximum collecting efficiency even with dust particles < 1 μm.
- Harmonized safety concept in co-operation with well-Known manufacturers.

For more information on this unit, please get the information brochure from our download section.

Filtration Concept for Chewing Gum Industry:

The process of manufacturing chewing gum consists of mixing many materials together, such as latex and sugars, creating a soft a chewy texture. The gum based (latex) is coarsely grinded into powder and mixed until uniform consistency, then dried. After drying, the gum base is cooked until melted in large kettle. Additional ingredients such as fine powdered sugar are stirred into kettles. Kneading the mass until the proper texture is done with large machines. Rolling onto a slab attains proper thickness. Prior to scoring, the gum is dusted with powdered sugar and broken into pieces, thus creating more dust. Some gums will be spray coated, and then tumbled to dry. Finally the gums are packaged. Furthermore, the cooking process may generate flammable material. The powdery substances account for dust around work areas and in the air. Proper filtering and ventilation will eliminate nearly all dust. This will better ensure safety for personnel and cleanliness of work areas, machines and the gum.

Herding Dust Extraction System Smart Features
- Consistency of 0.2 mg/m³, HEPA filter class R (HEPA H11)
- Extremely high useful life of filter media due to pure surface filtration.
- Clean air recirculation into working environment is possible.
- Dissipative, so called antistatic filter elements and equipotential bonding to avoid active ignition sources.
- Explosion protection by venting, suppression or containment.
- Optimal recoveries of filtered products back into production, due to non-linting filter media.

Advantages of our Dust extraction System for Chewing Gum Manufacturing
- Very high availability due to the long service life of Herding Sinter-plate filter elements.
- Expected dust concentration in clean gas < 0.2 mg/m³.
- Low pressure loss due to the relatively large filter area.
- Consistent surface filtration using PTFE coating.
- Contamination free product recovery.

For more information on this unit, please get the information brochure from our download section

Our Other Applications

- Filtration concept for Tyre Recycling.
- Filtration concept for Hot Rolling Stainless Steel
- Filtration concept for Laser cutting