Filtration

Whether you are running a process in a 30,000 L bioreactor in fed-batch mode, a 200 L continuous process, or have scaled-out (rather than up), you will start at small scale and look to increase the volume - scale-up - to some degree.

However, we are recognizing that some biotech companies aren't adopting single-use automated technology until the process reaches pilot scale. This can reduce the likelihood of a successful outcome or the speed of the development process, as process rework may need to be managed further along the manufacturing development process. In some cases, changes to inefficient processes may be more difficult to implement, especially if they have already been approved.

The adage "start with the end in mind" has never been more relevant. For scale-up to be successful, we recommend using the same automated single-use equipment, strategies and materials from the R&D stage through to manufacturing scale. That way, speed to market can be optimized through simplified technology transfer of optimal process. You will also avoid unexpected rework that may come about due to material compatibility or availability issues.

Start as you mean to go on

Speed to market is of critical importance, both from a return on investment point of view, but also with the benefits to patients in mind.

Having single-use automated technology in place at the R&D stage can make the move into the manufacturing stage more efficient.

The benefits include:

• Materials are pre-qualified at the R&D stage and approved for use in the application.
• Vendors are pre-qualified, audited and already in the supply chain.
• Operator training time is reduced.
• User confidence with the technology is increased.
• Using scalable automation solution and single-use components increases the likelihood that control parameters developed on a smaller scale system are available on a larger system.

And, if you use single-use technology during R&D you can also benefit from:

• Decreased turnaround times - as components don't require cleaning or regeneration.
• More consistent results - from using pre-made disposable manifolds, rather than building a flow path for each different processing run.

However, there are a few common pitfalls to avoid, which include making incorrect assumptions regarding how processes will behave at larger scale.

Ensuring successful scale-up in single-use bioprocessing webinar

Parker Bioscience Filtration is delivering a webinar on November 12th, 2019 which will help biopharmaceutical manufacturers build a strategy for effective scale-up of filtration and single-use processes that will facilitate technology transfer, in order to avoid delays in commercialization caused by inconsistent scale-up of a single-use process between R&D and manufacturing.

It will explain how to conduct a small-scale filtration trial using an automated single-use system at laboratory scale and examine the advantages this provides.

The webinar will also further explore the benefits of single-use technology in both R&D and manufacturing, and consider how to ensure successful implementation of single-use automation from laboratory scale through to large-scale production.

 

Register now for our webinar: Ensuring Successful Scale-Up in Bioprocessing

 

 

 

 

This post was contributed by David Heaney, market development manager (life sciences), Parker Bioscience Filtration, United Kingdom.

Parker Bioscience Filtration specializes in automating and controlling single-use bioprocesses. By integrating sensory and automation technology into a process, a manufacturer can control the fluid more effectively, ensuring the quality of the final product. Visit www.parker.com/bioscience to find out more.

 

 

 

Related content

Overcoming Barriers to Single-Use Implementation

Protecting Your Bioprocess From the Risk of Human Error

How to Successfully Scale-Up Automated Single-Use Bioprocesses

Automating and Enclosing Bulk Fill Operations - the Way Forward?

 

Single-use solutions have been widely adopted on a global scale within the biopharmaceutical industry due to the many advantages and process improvements they offer.

Key applications for single-use assemblies include the creation of process fluid flow paths, buffer/product storage solutions and sampling systems on varying scales. 

Most of these systems will start with either a bioprocess container or a tubing option and require the ability to connect to further pieces of equipment or additional single-use systems/manifolds.

In order to achieve this connectability, some form of connection needs to be selected — but with so many different connection types available, where should biopharmaceutical manufacturers start?

There are many different options available when embarking on the selection process. Consideration must be given to whether the connection type needs to be aseptic to provide quick and easy sterile connections, (even in non-sterile environments) or non-aseptic (to provide quick and easy non-sterile connections).

 

How do you choose the correct option?

The choice should be guided by the process itself — and the capability of the manufacturing plant should also be taken into account. 

Key factors which will determine the correct choice of connection type include:

• Whether the connection is to be made inside or outside of a laminar airflow hood.
• Whether the connection needs to address any specific safety requirements.
• Process conditions and compatibility.
• Bioburden control.
• Experience of operatives.
• Suitability for purpose.

Only when these factors have been addressed can the end-user begin to fully specify the connection type required. 

 

Connection types The Luer connector

The Luer connector is the simplest connector. It consists of both a male and female form, and the connection is made using a twist-lock action. These connections are suited to sample lines (with syringe connectivity) and low flow narrow-bore tubing applications and can be used within a laminar airflow hood to create aseptic connections.

However, there is a downside: potential misconnections can occur when they are not mated correctly. 

Quick connector

Quick connectors such as the MPC, MPX or MPU from CPC (Colder Products Company) are similar to Luer connectors in that they can be used within a laminar airflow hood to create aseptic connections. They have the added security of a push-fit feature with a secure locking mechanism. 

Triclamp

Triclamp (sanitary style) fittings can be used as connectors. While these are effective and secure connections, care must be taken to position the required o-ring seal within the connection prior to fixing the connection using an external clamp. The sheer size of the external clamp may make this an unsuitable method for connecting narrow bore or thin-walled tubing due to the weights involved and the potential for kinking/doubling of the attached tubing. Triclamp connections can be used within a laminar airflow hood to create aseptic connections. 

 

Connections outside of a laminar airflow hood

Should aseptic connections be required to be made outside of a laminar airflow hood, two options are available, which both allow the connection of varying tube sizes:

Gendered aseptic connector

The first option for connecting aseptically in a non-aseptic environment would be to use a gendered aseptic connector, such as CPC AseptiQuik® gendered, which has both a male and female version. The benefit of using a gendered connection is that it can help by safeguarding which lines can be connected to certain points in the process; this helps to mitigate against human error and the accidental connection of the incorrect lines/equipment.

When designing single-use assemblies using a gendered connector approach, care must be taken to ensure that the correct male / female side is designed into each part; this in itself can also create some areas for error to creep in. 

Genderless aseptic connector

Should the end-user not have any concerns over an accidental connection to the incorrect lines/equipment, or simply want to remove the error of male/female connector type which can creep in during design, there is the genderless aseptic connector, such as CPC AseptiQuik® genderless. These connectors take out the requirement for designing in the correct male/female orientation and can enable universal assemblies to be manufactured and connected with many other assembly/equipment types. 

Both gendered aseptic connectors and genderless aseptic connectors operate via a mechanism that enables connection in non-sterile environments to be made possible. This is because of the use of proprietary seals which mate together before a protective seal is removed, thus keeping the process stream in its aseptic/sterile condition. 

 

Connecting stainless steel and single-use

Should sterile connections between traditional stainless steel biopharmaceutical processing equipment and single-use assemblies be required, there is another option:

Steam-to connectors

Steam to connectors, such as CPC Steam-Thru®, work by allowing steam to pass through the section connected to the stainless steel equipment. Once steamed and connected, a valve within the connector is manipulated, creating a sterile or aseptic flow path. 

 

Conclusion

It is apparent that there are many connections capable of creating or maintaining an aseptic/sterile environment, but without the correct process condition assessment, operator care or design considerations, biopharmaceutical manufacturers could be looking at a costly connection failure. 

 

 

 

Download our white paper to find solutions to more single-use challenges: Single-Use Technology: The Next 5 Challenges to Conquer

 

 

 

 

 

 

 

This post was contributed by Graeme Proctor, product manager (single-use technologies), Parker Bioscience Filtration, United Kingdom.

Parker Bioscience Filtration specializes in automating and controlling single-use bioprocesses. By integrating sensory and automation technology into a process, a manufacturer can control the fluid more effectively, ensuring the quality of the final product. Visit www.parker.com/bioscience to find out more. 

 

Related content

Eliminating Leaks and Faults: Single-Use vs Stainless Steel Systems

Five Critical Challenges in Single-Use Bioprocessing

5 Benefits of Single-Use Technology vs Stainless Steel

 

 

Today, cement manufacturing plants have to contend with a double-edged sword: How do they reduce production costs and still meet environmental regulations? How do they accomplish their goals and directives while maintaining their equipment in a manner that prevents unscheduled downtime and hazardous conditions? Reducing the cost of fuel is a common strategy employed within the industry; in turn, this has led to an increase in the substitution of coal with petcoke.

Petcoke and its impact on the coal mill dust collector 

One area that has been impacted by the use of petcoke is the coal mill dust collector. Coal mill dust collectors have a substantial effect on productivity, yet have received relatively little attention as companies implement cost-saving programs, like the use of petcoke as a fuel reduction measure. Petcoke is typically ground finer than coal, and it has a particularly sticky nature that makes it more difficult to clean from filter bags. Its high sulfur content increases the likelihood of corrosion. All of these things bring into question whether the dust collector in use is properly designed for the conditions and if the operation and maintenance plan is effective in preventing system upsets and safety concerns. 

Here, we'll discuss effective design, operation and maintenance tips for this critical component of the coal grinding circuit and what you can do to evaluate the readiness of your coal mill dust collector.  

 

For complete recommendations on maintaining and operating coal mill dust collectors and how to reduce unscheduled maintenance, downtime and emissions, download the full article.

 

 

 

 

 

 

How to keep your dust collector operating at peak performance

Dust collector operators must take into consideration these items as they evaluate their current equipment design:
 

Airflow and filtration area

An air-to-cloth ratio that does not exceed 3.5 ACFM per 1 square foot is recommended to prevent short filter life, high differential pressure, higher emissions and operating costs.
 

Cleaning system

An undersized system can cause an excessive buildup of combustible material on the filter bags. The use of single diaphragm pulse valves or valves that are smaller than 1.5 inches often requires an upgrade.
 

Can velocity

Defined as the upward velocity of dust-laden gases between filter bags, excessive can velocity can result in higher pressure drop and excessive dust accumulation. For a coal mill dust collector, velocity should not exceed 240 fpm or 1.22 m/s.

 

 

 

Filter bag selection

Polyester, acrylic and aramid filter bag fabric materials require a dust cake for fine particle filtration. This can lead to an increased risk of combustion. Opting for an ePTFE membrane material, like the BHA Preveil filter from Parker Hannifin does not require a dust cake, reducing the combustion risk.  

BHA Preveil filters are made from PTFE resin, a substance with inherent non-stick properties that can be used to help your dust collector operate at maximum efficiency by providing:

• 99.99% efficiency
• Higher airflow
• Better cleaning
• Optimum emissions control

  
Inlet design

Proper inlet design distributes gas flow evenly and eliminates abrasion issues, which cause holes in the bags and increased emissions.
 

Hopper and housing design

A steel, air-tight housing and hopper, free of shelves or other particle accumulation areas, equipped with level and temperature measurement devices is recommended to prevent hazardous conditions. To avoid buildup of combustible materials, hopper walls should be designed with a minimum angle of 70 degrees from horizontal.
 

Insulation

A lack of insulation can result in moisture and accumulation of combustible dust. When petcoke is used this can also result in the increased formation of sulfuric acid and eventual corrosion of the dust collector.
 

Material handling system

It is essential that material handling equipment can withstand surges. A good practice is to size the equipment to the capacity of conveying equipment, even if the actual requirement is substantially less. Equipment should be equipped with motion sensors.

 

Operation and maintenance

With a properly designed dust collector, good operational practices can result in a reduction of downtime, emissions and hazardous conditions. The following practices are recommended:

• Startup and shutdown procedures: Establish specific, written protocols.
• Regular dust collector inspection: Checking pressure drop, visible emissions, the cleaning system, material withdrawal equipment, damper settings and fan operation once per shift is a recommended practice.
• A staggered sequence of actuation of the cleaning system pulse valves: This will reduce dust recirculation and pressure drop across the filter bags.
• Continuous operation of the cleaning system and material removal equipment: This will help to prevent the excessive dust accumulation on the filter bags and in the hopper.

 

For complete recommendations on maintaining and operating coal mill dust collectors and how to reduce unscheduled maintenance, downtime and emissions, download the full article.

 

Contributed by the Filtration Team.

 

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In the biopharmaceutical industry, extractables and leachables have come under the spotlight as stainless steel manufacturing systems have given way to single-use assemblies in manufacturing operations. 

Yet, there is some confusion as to what the terms 'extractables' and 'leachables' actually mean. They are often talked about interchangeably, but there are actually distinct differences between the two. 

Extractables studies are an assessment performed on a material. They are performed to identify substances that a patient may be exposed to and are typically conducted using 'worst-case' conditions. 

Leachables studies are an assessment performed on the drug product to identify substances that patients are potentially exposed to and are typically conducted using 'true process' conditions. 

     

Learn about different approaches to extractables and leachables testing in our white paper: Demystifying Extractables Testing

        So why are extractables and leachables so important?

Due to the nature of plastics and the potential release agents and plasticizers used in their manufacturing processes, there is potential for some of these to be released into the biopharmaceutical process stream. 

In a single-use assembly, numerous components have the potential to contribute to extractables and leachables. These include tubing, connectors, bags, bottles and filters. Therefore, the whole assembly should be assessed collectively. 

Every plastic will have some degree of compound leaching or release, but each compound may not be given equal importance with regard to what is allowed or is applicable to the process stream. 

As there is no 'one size fits all' with regard to what is and isn't allowed for many compounds, end-users need to assess the risk based on a number of factors. 

Risks and assessment can be categorised into:

• Those which impact on patient safety, for example toxicological effects
• Those which relate to technical factors, such as process control and regulatory approval
• Those which relate to social factors and perceived negativities, such as social media trending of compound 'buzz words'.
   

Areas of responsibility

Vendors usually take on the responsibility of performing extractables studies, while end-users taken the leachables part - as these studies should be conducted using 'true process' conditions. However, there remains some confusion over what a vendor should provide. 

In our Demystifying Extractables Testing webinar, we asked participants what their expectation was of a single-use vendor's role in extractables and leachables studies. 

While more than 70 percent of respondents believed that the vendor could only offer extractables data, more than 20 percent responded that both extractables and leachables data should be supplied by the vendor. However, leachables data needs to come from a true process stream that only the end-user would have access to. 
 

The extractables process - the vendor's point of view

The vendor would take the following steps:

• Selection of component parts - selection and materials of construction would be scrutinized, ensuring that as much as possible, industry-standard components or materials are used
• The material of construction - product contact materials and additives would be considered
• Assessment of stability to irradiation
• Assessment of stability to common biopharmaceutical process solutions and chemicals
• Assessment of further manufacturing process steps which would have the ability to change or add compounds which could be released

The vendor would then either perform their own extractables study, or obtain the extractable data set from their supply chain in order to identify 'worst-case' released compounds under extreme conditions. 

The outcome from the vendor's point of view would be to:

• Ensure that products have patient safety at the forefront
• Instill confidence with their customers that they are supplying good quality characterized consumables
• Ensure that, throughout the supply chain, there is control over the individual component parts
• Understand any interactions which may occur that could have the ability to negatively affect customer processes
   

The extractables process - the customer's point of view

The customer would take the following steps:

• Selection of component parts - customers may have experienced negative effects on their own processes with specific components used within singe-use assemblies. This may inform their choices

• The material of construction - product contact areas and any additional additives would be key considerations
• Stability to irradiation, process streams, solvents and chemicals would be assessed

The process would then be mapped out to ensure that all components are compatible for their intended use. The next step would be to take the 'worst-case' extractables data from the vendor and risk assess this based upon knowledge of their process.

This helps the customer understand how componentry will behave, but to satisfy regulatory bodies, further 'leachable' studies may need to be performed using the actual process stream intended for use with the assembly. There is generally more process risk from extractables and leachables as the process progresses. Released compounds early in the process may be removed through processing steps, but as the process reaches its final formulation, the risk attached to any released compounds present exponentially increases. 

The outcome of this data generation from the customer's point of view would again be to:

• Ensure that the products they supply always have patient safety at the forefront
• Ensure that their manufacturing process and drug product is consistent and 'in-control', in order to receive regulatory approval
• Ensure that there is control over the individual component parts throughout the supply chain, and to understand any interactions which may occur and could negatively affect processes
   

Conclusion

It is vital that there is clarity across the biopharmaceutical manufacturing industry on the importance of extractables and leachables studies and who should carry out the studies. And, while both vendors and customers may have different reasons for carrying out testing, the end goal for both parties is the same. 

 

     

Learn more about extractables and leachables testing in our white paper: Demystifying Extractables Testing

   

 

What approach does your company take to extractables and leachables testing? Let us know in the comments below.

 

This post was contributed by Graeme Proctor, product manager (single-use technologies), Parker Bioscience Filtration, United Kingdom.

Parker Bioscience Filtration specializes in automating and controlling single-use bioprocesses. By integrating sensory and automation technology into a process, a manufacturer can control the fluid more effectively, ensuring the quality of the final product. Visit www.parker.com/bioscience to find out more. 

 

Related content

5 Benefits of Single-Use Technology vs Stainless Steel

Five Critical Challenges in Single-Use Bioprocessing

Filtration and Biopharmaceutical Process Protection

Eliminating Leaks and Faults: Single-Use vs Stainless Steel Systems

Design Space and its Use in Single-use Bioprocessing

Has Single-use Customization Gone too Far?

 

 

Battlegrounds Coffee is a small, community-oriented coffee shop in Haverhill, MA. The owners were challenged to find a more efficient and consistent way to deliver Nitro Coffee to their customers.

 

Nitro coffee is the new smooth brew

According to Battlegrounds Coffee, Nitro coffee is the new trend.

It has a soft smooth mouthfeel. It’s like sipping on a Guinness. It gives the sensation that you’ve added cream to it but you haven’t. It looks fantastic poured and cascading in a glass. Nitrogen gas enhances some of the complex coffee flavors that you find in our blends and roasts at Battlegrounds Coffee. Prior to using the generator, we were using pre-charged food-grade nitrogen tanks.

"Tanks were the most difficult aspect of making and maintaining nitro coffee. The pressure gauges on the regulator were faulty indicating you had more nitrogen that was really left. As owners, we would get calls in the middle of the day saying 'Hey, we are out of nitrogen!'

For us, it was a hassle getting those tanks refilled. We had to drive to the local welding shop. We change out the tank 3-4 times per week so you had to assure that was done right and that there were no leaks. It wasn’t an efficient system and was becoming a hassle. The supplier was charging more than $50 per tank for food-grade nitrogen so my payback was very quick."

— Sal DiFranco, Battlegrounds Coffee

 

Nitrogen Generators with on-board compressors for low flow applications provide safety, savings, and convenience.

Parker nitrogen generators completely eradicate the danger, inconvenience, and high costs of truck delivered nitrogen. The hassles of changing high-pressure tanks and the routine interruption of nitrogen supply are eliminated. They offer long-term cost stability by eliminating vendor price increases, contract negotiations, long term commitments, transportation issues and hazmat charges.

Once installed, a continuous supply of high purity nitrogen is available within a few minutes of startup. Nitrogen, unlike CO2, imparts a small bubble that creates an attractive cascade down the side of a glass. More importantly, the small size of the nitrogen bubble creates a smooth, creamy finish on your palate. Consumers report that it is even sweeter than conventional iced coffee.

 

Watch the video interview with Battlegrounds:

 

Meeting the needs of retail coffee establishments

Building on Parker’s history of over 35 years of producing Nitrogen Generators for beverage dispense, we are pleased to offer a nitrogen gas generator specifically designed to meet the needs of retail coffee establishments. Parker Nitrogen Generators eliminate the danger, inconvenience and high costs of truck delivered nitrogen. There is no need to rely on an outside supplier. The hassles of changing high-pressure tanks and the routine interruption of nitrogen supply is completely eliminated. 

Parker Nitrogen Generators are also good for the environment because delivered nitrogen is manufactured using an energy-intensive process and then distributed in smog generating trucks. Parker generators offer long term cost stability by eliminated vendor price increases, contract negotiations, long term commitments, tank rental fees, delivery fees and hazmat charges. Once the generator is installed, a continuous supply of high purity nitrogen is available within a few minutes of startup.

Cold brewed coffee may be enhanced with nitrogenation. Nitrogen becomes infused into the coffee, much like a nitro beer. Nitrogen, unlike CO2, imparts a small bubble that creates an attractive cascade down the side of a glass. More importantly, the small size of the nitrogen bubble creates a smooth, creamy finish in your mouth. Consumers even report that it is sweeter than conventional iced coffee. Imagine the reaction of your customers to a creamy slightly sweet coffee without the need for added cream or sugar! Parker nitrogen generators are ready to operate as delivered with carefully matched components engineered for easy installation, operation and long term reliability. The generators are free-standing and housed in an attractive cabinet with casters.

 

Operation

The Parker DN-6NA Nitrogen Generator is designed to provide a constant supply of nitrogen gas, at a pre-selected purity, flow, and pressure. The system uses proven Pressure Swing Adsorption (PSA) technology with a Carbon Molecular Sieve (CMS) to separate N2 from the atmosphere and deliver it at high purity. The installation consists of simply connecting the plug to a standard outlet and connecting the nitrogen outlet to your coffee dispenser.

The onboard compressor means that there is no need to connect to a source of compressed air. Simply turn it on, and the air is then prefiltered, compressed, and passed through a 0.01 micron filter rated at 99.99%. The air is then passed through the CMS separation bed which captures the oxygen, creating a stream of high purity nitrogen. Lastly, the stream of nitrogen is passed through a sterile grade filter rated at 99.99999+% at 0.01 micron and then sent to the coffee dispenser. The CMS bed is regenerated to remove the captured oxygen and the cycle repeats.

  Nitrogen generator package includes

• Nitrogen generator, filters, controls, and an on-board compressor
• Floor mount on casters
• Automatically shuts down if there is no demand
• Stays in standby mode until more nitrogen is needed
• Environmentally friendly
• Compact - frees up floor space
• Eliminates unexpected shutdowns
• Hassle-free operation
•  Safe and reliable
• UL, NSF, & CE listed
• CB Scheme, CSA, EMC and IEC certified

 

 

 

 

"The Parker DN-6 provides nitrogen without any interruption. It’s always ready. Saved us at least four man-hours per week. It is awesome! We use nitrogen to push Kombucha too. Plug and play. It’s always working and saves us a lot of time. We also pour wine and we keep the wine bottle purged with nitrogen to keep it fresh. We are also looking at using it to pour our beer too.”

— Sal DiFranco, Battlegrounds Coffee

 

"We were always fighting with the tanks to work properly to pour the perfect pour for a nitro cold brew. Since we’ve had the nitrogen generator it has been easy breezy. With a generator, you don’t have to worry about it. You set and forget. We never have to tell customers 'Sorry we aren’t pouring today.' The pour looks great, tastes even better.”

— Dana, Battlegrounds Coffee

 

To learn more about self-contained nitrogen generators for nitro iced coffee, download a copy of the case study and call Parker today at 1-800-343-4048. 

 

Article contributed by the Gas Generation Team.

 

Additional articles on this topic:

Nitrogen Gas Generators Save Winemakers Time and Money

Consumers and Roasters Benefit from Coffee Packaging with Nitrogen

Top Frequently Asked Questions About Nitrogen Generators

Dust collectors are important tools in any industrial manufacturing operation. They provide a cleaner environment for employees, eliminate air quality concerns, and meet environmental compliance directives. Downward flow cartridge dust collectors are commonly used in processes to remove pollutants in grinding, sanding, thermal spraying and making graphite, ink dyes, silica talc and toner. Choosing an optimally designed downward flow dust collector is key to controlling the air quality in your plant. To ensure your dust collector performs to its full potential, using the most advanced, and efficient filtration technology is critical. This winning combination will maximize overall system performance and efficiency resulting in major energy savings and reduced operating costs. Let's take a look at factors to consider when selecting a downward flow dust collector and the best type of filtration to go along with it.

 

For detailed information on MERV efficiency ratings and other comparison data on downward flow cartridge dust collector filtration and cleaning systems, download the full white paper.

 

 

 

There are two important factors to consider when choosing a downward flow dust collector:

1. Quality of the filter media
2. Performance of the cleaning mechanism

 

Quality of the filter media

When it comes to dust collector filtration technology, there are basically two types of cartridge dust collection filters available:

1. Traditional commodity filters
2. Advanced nanofiber technology filters

Commodity filters vs. advanced nanofiber technology filters

Substrate material and surface coating

Traditional commodity filters are straight cellulose with one homogenous layer of cellulose fiber. Blended cellulose filters typically consist of 80 percent cellulose and 20 percent synthetic fiber. Commodity filters sometimes come with a melt-blown surface layer added to improve efficiency at capturing submicron particles.

The surface of any filter cartridge media contains holes or open space. Media with smaller holes will be more efficient at capturing fine particles. Using a material with the smallest fibers possible offers the highest efficiency rating.

The most technologically advanced type of filters available are nanofiber filters. This type of filter media uses fibers as small as 1/1,000 of a micron. To put this in perspective, there are over 25,4000 microns in an inch! That means that a nanofiber filter can capture submicron-sized particles.

Efficiency and MERV rating

To assess a filter's efficiency, the most accurate measurement available is the MERV (Minimum Efficiency Reporting Value) system. The higher the MERV rating, the better the filter's efficiency at removing submicron dust particles from the air and reducing emissions. MERV ratings are based on a scale of 1 to 20, and classified into three particle size ranges:

• Range 1 – 0.30 to 1.0 micron
• Range 2 – 1.0 to 3.0 microns
• Range 3 – 3.0 to 10.0 microns

Standard commodity filters typically achieve a MERV rating of 10, meaning that they are only able to capture particles 1.0 micron and larger in size. In fact, they are not even efficient enough to be rated in range 1 because they cannot capture dust that is in the .30 to 1.0 micron size range. In other words, submicron dust passes right through commodity filters and back into the workspace and your employees’ breathing zones!

Nanofiber filters, on the other hand, achieve a MERV 15 — the highest of any standard cartridge filter. This means that nanofiber filters are 85 - 95% efficient at capturing particles 0.30 to 1.0 micron in range 1 and more than 90% efficient at capturing particles 1.0 micron-sized and larger in ranges 2 and 3.

Low pressure drop

Nanofiber filters offer the highest possible efficiency and effectively prevent particulate from building up within the filter’s substrate and restricting airflow. Because of this, pressure doesn't build up as fast as it will in a lower efficiency commodity filter. A low pressure drop means the dust collection system needs less energy to run and can use a less expensive blower.

Reduced emissions

An unavoidable by-product of the filter cleaning process is that a small percentage of the collected dust is released back into the atmosphere. Because nanofiber filters require less frequent pulse cleaning, total outlet emissions are reduced.

Commodity filters typically emit up to 35 times more dust back into the atmosphere than nanofiber filters.

 

Performance of the cleaning mechanism

To dislodge dust from the filters into a collection bin, most downward flow dust collectors use pulse-jet cleaning technology — a process where the system’s cartridges are cleaned by a blast of compressed air, causing dust to pulse off into a drawer or hopper for disposal.

Pulse-jet cleaning systems used in downward flow cartridge dust collectors are similar, but they differ in several ways that can significantly affect cleaning efficiency, ease of use and filter life. It’s important to carefully consider the performance of the cleaning system when evaluating a downward flow cartridge dust collector. Here’s what to know:

Nozzle and venturi design

These key components determine the cleaning achieved with each blast of compressed air. Systems with a poorly designed nozzle and venturi cannot pulse the air with enough velocity.

Choosing a system that is optimized for the spacing of the air nozzle, as well as precisely calculated geometry of the venturi ensures that the air is pulsed with enough power to completely clean the entire length of the filter. 

 

Filter support

Some systems use an internal yoke support which can actually act as an obstruction that blocks the pulse cleaning jet — creating turbulence and less cleaning power. A system with filters that rest on rails is a better choice because there are no internal blocks at any point along the cartridge filter – resulting in up to 25 percent more cleaning power.

Filter technology

Selecting a downward flow dust collector that combines an optimized cleaning system and uses the advanced surface-loading capabilities of a nanofiber filter directly results in less pulse cleaning cycles (less compressed air use) and longer filter life. A commodity filter may pulse as much as 17 times more than an advanced nanofiber filter, resulting in considerable compressed air costs. Likewise, using nanofiber technology can double the filter life and cut replacement filter costs by 50 percent!
 

Cabinet design and quality

The design of the dust collector’s cabinet directly affects airflow and cleaning efficiency. Choosing a design that evenly distributes air throughout the cabinet is optimal.

The cabinet should be coated entirely with an electro-statically applied, powder-coated finish to prevent fading and chalking. And, it should be manufactured with 10 gauge steel and meet Seismic Zone 4 and 100 mph wind load ratings to ensure performance in harsh outdoor conditions.
 

Serviceability

Some systems use angled filters which can cause dust to accumulate against the inside of the door and on the top of the filter. When the door is opened, dust can fall on the maintenance worker. Ensure the design features a simple, replacement process, such as a push to seal closure that eliminates the need to turn knobs and hook latches.
 

Easy add-ons

Selecting a system that offers a modular design is ideal when you need to increase capacity.
 

Factory support

It’s always a good idea to choose a system from a well-known manufacturer that offers premier customer support to ensure your equipment meets all environmental requirements and operates effectively well into the future.

 

One such system that meets all of the above requirements is Parker’s DustHog SFC Downward flow dust collector. The SFC effectively removes dust, fumes and smoke from industrial manufacturing processes and applications. It comes standard with the industry-leading ProTura® Nanofiber cartridge filters for more efficient and effective collection of dust emissions and capture of submicron airborne pollutant particles. The patented pulse cleaning technology provides optimized cleaning power to most effectively pulse off dust from the filter resulting in increased pulse cleaning energy, lower pressure drop, longer cartridge filter life and energy savings.

 

 

 

Watch this video to learn more about the Parker DustHog SFC Cartridge Dust Collector System:

 

Conclusion

A cartridge dust collector is an important investment that impacts the performance of the equipment in your operation and the health of your employees. To realize the greatest return on your investment and provide the safest work environment possible, your best option is to choose a surface-loading nanofiber filter and dust collection system that also offers an optimized cleaning system to gain the maximum benefits of the filter’s capabilities.

 

Download the full white paper for detailed information on MERV efficiency ratings and other comparison data on downward flow cartridge dust collector filtration and cleaning systems.

 

This article was contributed by the Filtration Team.

 

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