Scrubber Internals

Scrubber internals refers to a group of devices specifically designed to remove particulates and or gasses from industrial exhaust streams. Scrubber internals work together in achieving maximum removal efficiency of pollutants. Each scrubber internal has a specific function in the scrubbing process. The design of scrubber internals can range from very basic to extremely complex depending on the customer’s requirement and the exact application. Various materials can be used in the construction of internals including a vast variety of plastics and metals. Temperatures, contaminates and cost will typically determine the material of construction. For example, KemFlo can manufacture their plastic random packing product the Tri-Pack in a variety of resins including Polypropylene, CPVC, Kynar, Tefzel, Teflon and more.

Scrubber internals include the following devices or items:

Mist Eliminators are basically metal or plastic wire mesh held together with a grid on either side of the mesh and is used to collect and separate liquid from gases.

Liquid Feed Pipes are used to introduce a liquid into the unit and is typically positioned above a liquid distributor.

The liquid distributor collects liquid from the feed pipe and is specifically designed to evenly distribute the liquid evenly over a packed bed.

The Packed Bed may include a variety of random packing types and or materials such as KemFlo’s Tri-Pack, Pall Ring or Plastic Saddle style. KemFlo manufactures a Tri-Pack and Pall Ring in 1”. 2” amd 3.5” sizes and both styles are available in a variety of resins. The random packing sits on a packing support which purpose is to support the random packing and prevent individual packing pieces from falling into lower levels of the scrubber.

The packing support must be designed in such a way that its openings are small enough to prevent the random packing from falling through but with enough open area as to not prohibit liquid and gas flow
through the system. It must also be designed to hold the weight of the bed of random packing.

In many cases a bed limiter is positioned directly on top of the packed bed and prevents the random packing from being blown into the upper levels of the unit. Like the packing support the bed limiter must be designed so that the random packing can not escape through its openings but also must not hinder liquid and gas flow.

Vapor distributors are typically located near the bottom of the scrubber unit. The purpose of the vapor distributor is to evenly introduce the gas into the lower portion of the scrubber. A vapor distributor is basically a flanged pipe with a series of holes. The spacing and size of the holes in a vapor distributor are specifically designed based on the gas, flow rate and size of the scrubber.

All of the above scrubber internals are available in a variety of materials such as thermoplastics, metals and ceramics. Determining the best material of construction for internals depends on the application, temperature, pressure and contaminate. It is very important to have an engineer evaluate your specific application to determine the best column internals for your application.

For help regarding plastic random packing please contact Kemflo for more information on our Tri-Pack, Pall Ring or plastic Saddles plastic random packing. Information on KemFlo’s Tri-Pack, Pall Ring and Saddle can be found at

KemFlo’s Commitment to Customer Service

Providing the highest quality plastic scrubber packing on the market backed by superior customer service is what sets KemFlo apart from other manufactures. KemFlo’s goal is to provide cost effective plastic scrubber packing solutions with the highest level of quality for our customers. We accomplish this by using innovative methods supported by a long history of experience and by utilizing current technological advancements and sound engineering solutions. Our employees are devoted to pursuing the challenges presented as a means to accomplish the end goal. We understand our customer’s demands and are committed to their complete satisfaction through open communication.

We understand the demands and expectations our customers face day in and day out which is why we focus on customer service in addition to high quality manufacturing. Having exceptional products such as the high performance plastic scrubber packing Tri-Pack or spherical packing, the Plastic Pall Ring and the Plastic Saddle Packing is not enough. That’s why special care and attention is given to customer inquires from the time we receive them to the time the Plastic Scrubber Packing is on site. Helping our customer’s through the process of selecting the best plastic scrubber packing solution for their application is extremely important to us. We help our customers select between our Tri-Pack style packing, Plastic Pall Ring and our Plastic Saddle Packing by evaluating the plastic random packing size, geometric surface area, operating temperatures, chemical environment and application. No one knows their system or application better than the customer themselves which is why we work closely with our customs from start to finish.

When an inquiry is first received by the KemFlo sales group the type of plastic scrubber packing is confirmed. If the customer knows exactly which plastic scrubber packing they require the process moves very quickly and the customer will have pricing and availability immediately. In many cases the customer wants freight cost as apart of the inquiry. KemFlo works closely with a number of logistic companies to ensure competitive freight rates for our customers. If a customer is uncertain of the style of Plastic Scrubber Packing they need we can provide the physical properties for our Tri-Pack, Plastic Pall Ring and our Plastic Saddle Packing for our customer’s review. In some cases our customers need assistance in selecting the appropriate resin for the plastic Scrubber packing. In these cases KemFlo offers general service temperature guide lines for common resins listed on our website at Upon request corrosion resistance charts and temperature range data can be provided for specific resin types. Please note that all resin used in KemFlo’s manufacturing of plastic scrubber packing can be traced back to the specific resin supplier’s batch as apart of our quality assurance program.

KemFlo stocks significant amounts of packing at both their Richmond Hill and Houston locations which means many order can ship quickly. In cases where KemFlo has to manufacture a customer’s order from scratch, we provide customers with accurate delivery schedules and keep them informed regarding the progress of their order.

KemFlo works hard to earn your plastic scrubber packing business and looks forward to developing long lasting relationships with our customer. For more information regarding KemFlo’s Plastic Scrubber Packing product line including the Tri-Pack, Plastic Pall Ring and the Plastic Saddle Packing please give us a call or visit our website at

Air Stripping

Contaminated ground water or surface water occurs when manmade products such as gasoline, oil and chemicals get into the water and cause it to become unsafe and unfit for human consumption. Since half of the United States population is dependent on groundwater it is extremely important to protect this resource.  Drinking contaminated groundwater can have serious health effects. Wildlife can also be harmed by contaminated groundwater. A good example are the pesticides and fertilizers that can find their way into groundwater or other water supplies. Other examples of sources of groundwater contamination include storage tanks which may become corroded, crack and develop leaks, Septic systems that are not maintained properly, Hazardous waste that is not properly disposed, landfill runoff, road salts and atmospheric contaminates. 

One of the most efficient ways to clean contaminated ground water or surface water is to utilize an air stripper. Air stripping is the process of moving air through contaminated groundwater or surface water in a treatment system. Air Stripping removes chemicals called volatile organic compounds or VOCs.  Volatile organic compounds are chemicals that easily evaporate which means they can change from a liquid to a vapor. The air passing through contaminated water helps evaporate VOCs faster and more efficiently. After treating the water, the air and chemical vapors are collected, and the vapors are either removed or vented.  Air stripping uses an air stripping column to force air through contaminated water and evaporate VOCs. The most popular type of air stripper is a packed column air stripper which is a vertical tank filled with plastic random packing such as kempac’s Tri-Pack, plastic Pall Ring or plastic Saddle. Contaminated water is pumped into the top of the column and sprayed over the plastic random packing material. The water trickles downward though the spaces between the plastic random packing. Air is blown into the bottom of the column.  As the air rises through the column it flows across the packing and contaminated water. The plastic random packing provides an area for the air and contaminated water to mix and helps to increase the rate of evaporation. The air is collected at the top of the column and can be released or treated while the water is collected at the bottom of the column and where it can be tested. This process can take months or even years depending on contamination concentrations and the amount of water required to be treated.  

Selecting the proper plastic random packing is important when designing an air stripper.  Kemflo manufactures three types of packing that should be considered when designing an air stripper under the kempac brand name.  these packing include the Tri-Pack style, Plastic Pall Ring and the Plastic Saddle. The Tri-Pack is available is 1”, 2” and 3.5”. The Plastic Pall Ring is available in 1”, 2” and 3.5”. The Plastic Saddle packing is available in 1”, 2” and 3”.  The Tri-Pack style is most commonly used in air stripping applications due to its unique design. The Tri-Pack is a spherical column packing that is constructed of a network of ribs, struts and drip rods. The Tri-Pack’s superior geometric shape and active surface area make it the ideal random packing for air stripping applications.  

For more information about kemflo’s Kempac plastic random packing product line please visit our website at

Air Scrubbing

Air scrubbers are air pollution control devices that use liquid to remove particulate matter or gases from an industrial exhaust or flue gas stream. In comparison to other air pollution control devices, scrubbers are a very efficient way of removing solids, mists, and gases while also providing cooling. They are also capable of handling volatile gases safely. However, scrubbers suffer from high levels of corrosion and produce slurry waste streams which are less convenient for recycling and disposal.

Scrubbers are devices that use a liquid to capture and remove pollutants. Through a nozzle or orifice a scrubbing liquid is introduced into the gas stream. The droplets capture the dust particles. This increases the size and mass of the particles, making them easier to collect in a filter or separation process. The scrubbing liquid absorbs and neutralizes gaseous pollutants. Suspended liquid is typically recovered in mist collectors and recycled through the system.

A key parameter in the design of scrubbers is the liquid-to-gas ratio. It is commonly expressed in gallons per minute (gpm) of liquid divided by actual cubic feet per minute of gas. This ratio is determined by the solubility of the gas pollutants, the amount of pollutants and particulate matter in the gas stream, and the mass transfer characteristics of the tower. Increasing the liquid to gas ratio increases the collection efficiency of the system, so finding the optimum ratio is important for balancing performance with operating costs.

Packed bed or packed tower scrubbers are systems which contain one or more layers of packing material to increase gas-liquid contact, such as Kempac’s Tri-Pack style, plastic pall ring, or plastic saddle packing. Gas streams enter in the bottom of the chamber and flow upward or horizontally through the packing as scrubbing liquid is distributed uniformly to the packing material. Once through the packing, cleaned gas passes through a mist eliminator while the waste liquid/slurry falls to the bottom by gravity. Some packed towers designed for

Packed bed scrubbers are primarily gas absorbers and are the most effective scrubbers for treating gas streams with gaseous pollutants. They can collect solids, but are not often used for this purpose because wet dust collecting in the beds would require unreasonable maintenance. One of the key design considerations for packed scrubber towers is the selection of the type of random packing and the material or type of resin. Kemflo offer several styles of plastic random packing in a variety of resins to meet your application.  Kempac plastic random packing is available in a Tri-Pack style packing which is available in 1”, 2” and 3.5”, a plastic pall ring packing that is available in 1”, 2” and 3.5” and a plastic saddle packing which is available in 1” 2” and 3”.  

There are multiple styles of scrubbers to consider. Stationary or enclosed scrubbers are housed in their own building or enclosure. These are typically used to treat process exhaust gases from industrial waste streams before they are released into the atmosphere. Portable scrubbers are small units used for local cleansing and cleaning applications. In addition to small size, they may have wheels or handles to make them easier to transport.  Skid or base plate mounted scrubbers are designed to be placed on a skid or plate positioned on the floor. These scrubbers frequently contain transport features such as forklift slots for movement around a facility. Trailer or truck scrubbers are mounted on a trailer or truck for mobile spot dust or fume abatement.

Performance specifications are the ratings assigned by a manufacturer that describe the scrubber’s performance. These are the specifications most important for industrial buyer to consider when selecting a suitable scrubber for their application.

  • Airflow or gas flow rate defines the acceptable flow rate or range of flow rates of the gas stream through the scrubber, measured in cubic feet per minute (cfm).
  • Liquid or water flow rate defines the intended flow rate or range of flow rates of the scrubber liquid in the system, often described in gallons per minute (gpm). It may be given as a liquid-to-gas ratio (L/G). It determines the amount of water used by the scrubber, which will have a large impact on the operating costs of the system.
  • Minimum particle size filtered indicates the minimum diameter of particulate matter that a dust collector is capable of capturing, measured in micrometers (µm). This rating effectively defines the range of capability of the collection device.
  • Efficiencycollection efficiency, or capture rate defines the percentage of particulate matter and/or gaseous pollutants in the filtered gas stream that is effectively removed by the scrubber. Efficiencies can vary widely for different types of scrubbers and different gas streams.

In addition to performance criteria, there are other parameters to consider when selecting scrubbers for a particular application. These include material compatibility and operating temperature.

  • Material compatibility – It is important to ensure the materials used in the construction of the scrubber are compatible with the chemical (acidity, reactivity) and physical (abrasivity) properties of the gas stream. Applications where the scrubbing liquid contains additional chemicals or substances may make it necessary to use specialty materials with high corrosion or chemical resistance.
  • Operating temperature – Although scrubbers are often designed to provide cooling or quenching of hot gas streams, these devices still are limited to a certain range of temperatures, above or below which they may not operate effectively.

For more information on Kempac plastic random packing product line including the Tri-Pack style, plastic pall ring or plastic saddle packing please visit our website at


Since 1988 KemFlo has been manufacturing high quality injection molded parts and products for a variety of applications and industries. KemFlo has designed and manufactured parts for numerous industries including chemical, industrial, energy, medical, environmental, agricultural and more. KemFlo has built a solid reputation for the design and manufacturing of injection molded parts. From the simplest to the most complex plastic injection molded parts Kemflo has the experience and expertise to assist from the conceptual stages to the finished product. Our goal is to provide cost effective solutions with the highest level of quality for our customers. To ensure this KemFlo makes significant investments in state of the art machinery, tooling, research and development, quality control, training and customer service.

Kemflo manufactures a high performance plastic random packing product line under the brand name Kempac. The Kempac plastic random packing line includes three styles of packing, the Tri-Pack, Pall Ring and Saddle style plastic random packing. In order to improve our service to our customers across the United States and abroad, we are seeking partnerships with manufactures representative, distributors and OEMs / Original Equipment Manufacturers. We are specifically looking for partnerships regarding our plastic random packing product line but would consider for other product lines and custom products as well. Regarding our plastic tower packing product line, we are seeking partnerships with individuals or companies who have experience in selling mass transfer process equipment to a variety of industries. More specifically those individuals and companies who have experience in selling the Tri-Pack, Pall Ring and Saddle style plastic tower packing.

KemFlo manufactures three different styles of high performance plastic tower packings each in three different sizes. Each style of packing is available in a variety of resins including polypropylene, polyethylene, PVC, CPVC, PVDF, Halar, PFA and more. The Tripack, Pall Ring and Saddle Style tower packing are available in 1”, 2” and 3.5” in order to meet the customer’s specific requirement. Please note that other resin types are available upon request.

The Tri-Pack is a hollow spherical column packing constructed of a network of ribs, struts and drip rods. The spherical shape of the Tri-pack makes this product unique compared to other styles of plastic tower packings. The Tri-Pack offers reliable and predictable performance and one of the most efficient packing media types available anywhere.

KemFlo’s Pall Ring tower packing is a robust ring featuring an open area wall construction which maintains even liquid distribution. The Pall Ring has reinforced structs provide additional surface area for gas and liquid contact which provides a higher level of efficiency.

The Saddle style plastic random packing features serrated edges which promote high mass transfer rates through effective liquid surface renewal. The serrated edges of Kemflo’s saddle style packing also reduce bed settling during operation and help to maintain packing free space and create lower pressure drop.

Kemflo also offers special packaging and labeling, product literature, product samples, and product support. Special discounts and protected territories and or accounts may also be available to select partners. For more information on KemFlo’s plastic tower packing product line please visit our website at or call Jason at 281-787-4061.