Like Oil and Water, and Ethylbenzene?

Chemical Resistance Compatibility

Tips From the Service Bench

Technology TIP

When pumping liquids, you must be sure flow path wetted materials are compatible with intended media. If not researched and tested, issues may arise in the field that may impact product life and maintenance schedules.

While Chemical Compatibility Charts are a good place to start your research, there is typically a standard disclaimer at the bottom that limits their application and places the responsibility on you the buyer, such as:

Warning: The information in this chart is to be used as a guide, ONLY. Although believed to be accurate, actual decisions on material selection need to be thoroughly tested and evaluated by the customer for each specific application. It is the full responsibility of the customer to perform and evaluate the compatibility of materials for their specific requirements. The manufacturer takes no responsibility, etc., etc…


ARE WE COMPATIBLE?

Polymer components exposed to incompatible media can experience swelling or loss of physical properties. When severe, these effects can lead to degradation of pump performance, reduced pump life, leakage, and even pump failure. These issues are avoided with proper material selection. Many pump manufacturers provide a selection of flow path materials to meet most needs, and some provide additional material options for exceptional cases.

TESTING OUR RELATIONSHIP

So, how do you go about testing chemical compatibility? You can get test swatches of possible polymer materials. But, results using test swatches can be less than applicable since they may be much thinner or thicker than the actual parts used in pumps. KNF offers a better way to assist your compatibility decisions, with our Chemical Resistance Test Kit (p/n 173610). This kit contains our most popular head plates and elastomer valves materials. These are actual production parts in current use, so they offer the best test subjects possible. For each material, two parts are supplied – one for resistance testing, the other as a comparison reference. Simple instructions will guide you through the static soak test process.

Chemical Resistance Kit Materials

Kit materials: (1) PEEK (2) PPS (3) PVDF (4) PP (5) FFKM-A (6) FKM (7) EPDM (8) FFKM-B (9) FFKM-C

SUMMARY

In a typical fluidic system, component lifetime will be influenced by several variables beyond simple compatibility of the liquid media, including chemical concentration, liquid temperature, operating pressure, flow rate, and exposure to abrasive materials. A static soak test cannot, therefore, replace a long-term validation test with a pump running in a real system under system parameters. But, a static soak test is well suited as part of an initial screening to identify and eliminate materials which are clearly incompatible with expected liquids.

Contact KNF today for a Chemical Resistant Test Kit and get pumping with confidence!

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Thread Seal Tape, a Fitting Friend

Tips From the Service Bench

By design, vacuum pumps pull gas or liquid in on the inlet side and expel media on the exhaust side. One prevalent issue to avoid, in order to ensure that the pump keeps operating to full potential, is keeping unwanted material out of the pump head and valves.

Many vacuum pump plumbing connections are made with hose connectors and fittings. One standard fitting thread is the National Pipe Thread (NPT). The threads on an NPT fitting are tapered for sealing, and are often used with a thread sealant, such as Thread Seal tape.

A recurring issue seen by our Service Department is loose Thread Seal tape unintentionally ingested into a pump (see photos below). The loose tape gets pulled in by the vacuum and lodges between the valve and valve seat. This can result in a loss of performance in the system and headaches for the pump user. The cause of this reduced performance is often not readily apparent, either.

Figure 1: Actual photos of ingested Thread Seal tape found within pump heads.

Once ingested, tape will not be expelled on its own as the path through the pump head is not designed to allow long/stringy solids to move through it. The removal of the tape debris involves disassembly of the pump head assembly, removal of the tape and re-assembly after inspection of all the components. This is time consuming and can be avoided.

One way to avoid ingested Thread Seal tape is to understand how the tape works in conjunction with the fitting and threaded port hole. The taper on NPT threads allows them to form a seal when torqued, as the flanks of the threads compress against each other. The fittings seal on the actual thread of the fitting and the hole. The fitting does not necessarily have to be installed to full thread depth as it is sealing on the thread itself.

DO’S

Figure 2: Apply Thread Seal tape

• Wrap the tape clockwise (facing the threaded portion) so that it follows the direction that the fitting will be threaded into the port (see Figure 2). Winding the tape in this direction will prevent the tape from unwinding during the tightening process.

• Use a Thread Seal tape that is narrow enough so it does not cover the first two threads of the fitting (see Figure 3). The first of the male fitting threads are the smallest in diameter and any tape wound onto these threads may actually be cut off as the fitting engages. The cut off tape may then be pulled into the pump head by the gas or liquid flow.

Figure 3: Correct application of Thread Seal tape

• Use 2-4 wraps of Thread Seal tape. You may need to adjust the number of wraps due to specific tolerances.

• Start the fitting by hand to ensure no cross threading occurs.

• Tighten according to fitting manufacturer specifications.

DONT’S

Figure 4: Incorrect application of Thread Seal tape

• Don’t wrap the tape covering the bottom of the fitting. Leave two threads free of tape (see Figure 4).

• Don’t feel the need to tighten fitting until the hex is flush. The sealing occurs on the tapered thread. It is OK if a few threads are left visible as long as the fitting is tightened to the manufacturers specified torque.

WRAP UP

Learning to apply Thread Seal tape properly will serve you well. When used properly, Thread Seal tape is a wonderful sealant. It is inexpensive and works in many different applications. It is easy to apply and lubricates the fitting and threaded hole assembly process. It also prevents possible corrosion at this interface and aids fitting removal.

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New Flow-Tight, Diaphragm Liquid Transfer Pump Prevents Uncontrolled Flow

New, FL 10 Diaphragm Liquid Transfer Pump Prevents Uncontrolled Flow

KNF’s newest liquid transfer pump, the FL 10, is leak-tight in both directions, preventing uncontrolled flow and back-flow of liquid media when not in use. The latest addition to KNF’s extensive line of diaphragm liquid transfer pumps, the FL 10 offers many advanced features, and provides a considerable advantages over similar competitive products.

Leak-tight Diaphragm Liquid Transfer Pump

Featuring a solenoid-drive, and leak-tight valve technology, the compact FL 10 liquid transfer pump displaces fluid at a flow rate of 0 – 100 mL/min. Additionally, a signal frequency modulation feature enables quick and easy flow rate adjustments, saving time and money. Finally, like all KNF diaphragm liquid handling pumps, the FL 10 is self-priming, dry-run safe, and maintenance-free – offering outstanding performance longevity and an extraordinarily long service life (10,000 hours or 1.8 billion strokes).

To learn more about the leak-tight FL 10 liquid transfer pump visit knfusa.com/FL10

Liquid Waste Handling in Clinical Diagnostics and Lab Equipment

A new Application Note from KNF Neuberger, Inc. details effective methods for collecting, and evacuating liquid waste.

oem_application_noteWhen determining how to transfer liquid waste within an analyzer, design engineers must examine many factors. Though several methods will work, only one provides optimized system performance and lifetime.

Read more >>

 

Reaction Time: Q&A with Jim Abbott, Market Manager, Julabo USA, Inc.

PITTCON mascot, Pete Con, standing beside the Julabo reactorNot too long ago, while attending the PITTCON show in Atlanta, Georgia, we came across a unique and eye-catching exhibitor system – a special reactor manufactured by Julabo USA, Inc. featuring two KNF SIMDOS® liquid metering pumps transferring fluids to and from the reactor vessel. The machine is quite intriguing on its own; however, after having noticed the two KNF liquid diaphragm pumps, we contacted Jim Abbot, Market Manager, from Julabo USA, Inc. to learn more about the company’s impressive reactor.

1. Overall, what is the purpose of this reactor, what exactly does it do? Does it have an official name?

“We typically just refer to the small reactors of 100mL to 5L size as ‘bench scale’ or ’bench top reactor’, and the 10L to 100L sizes as ’kilo-scale pilot plant reactors’. Systems are available in both glass and stainless steel. Also, we are proud to be the US distributor of Berghof high pressure reactor systems – these have a ton of applications which they are used for but typical uses include: pharma, bio-pharma, plastics, paints, polymers, adhesives, petrochemical, energy, and most recently cannabis. The reactors are primarily used in mixing applications but with add-on features they can be easily equipped for various distillation methods such as: refluxing, short path and fractional distillation. All of our units are automation capable and can be easily controlled using our PC or PLC based AUTOReactor™ control and data logging packages.”

2. What is the function of the two KNF SIMDOS® pumps used within the Julabo reactor?

SIMDOS_Pumps_2 SIMDOS_pumps_1“We use the KNF pumps to control liquid additions or product sampling. The KNF SIMDOS pumps are used, specifically, because of their high quality, reliability, and automation capability. The pumps are connected to our PC or PLC based AUTOReactor™ control and data logging packages which allows users to program and control the process quite effectively and efficiently.”

3. I noticed that the reactor uses both KNF SIMDOS 10, and SIMDOS 02 pumps. Is there a reason why two different KNF SIMDOS pump types were selected?

“We displayed both [pumps] on [our demo] system, but typically we use the SIMDOS 02 on the bench scale reactors, while the SIMDOS 10 is used on the kilo-scale reactors. This is because of their different delivery rates as associated with the scale of the process, but quite often these are used interchangeably across both platforms.”

4. Is there any particular reason that compelled the system’s designer to choose KNF pumps over other dosing pumps from other pump manufacturers?

“We (Julabo) have had a long relationship with KNF both in the USA, and around the world. Moreover, we know without a doubt that KNF has the same principals as JULABO as far as delivering high-quality, reliable products.”

5. Will the Julabo reactor(s) be featured at the ACS tradeshow next week?

“Yes it will; we plan to display it again with the [KNF SIMDOS] pumps in a different configuration but always taking front stage, hand-in-hand with the JULABO products.”

6. Would you like to share any additional facts, or interesting notes regarding this system?

“We are devoted to offering our expertise in temperature control and reaction systems to our customers. Likewise, we are dedicated to providing solutions, from the inception of a process, through scale-up, and into manufacturing. One of the key factors is we design all of our systems with the utmost flexibility so as processes change, and companies grow we to can change and grow together with them.”

Julabo will be exhibiting at the upcoming ACS tradeshow in Philadelphia on August 21-23, 2016. If you will be attending the show, then be sure to check out Julabo’s incredible reactor system(s) incorporating KNF SIMDOS dosing/metering pumps. Also, don’t forget to visit KNF booth #1626 to see our latest laboratory technology, including: SIMDOS 10 and SIMDOS 02 liquid metering/dosing pumps, LABOPORT diaphragm vacuum pumps, LIQUIPORT liquid transfer pumps, the versatile VC 900 vacuum controller, and KNF’s award-winning RC 900 rotary evaporator.

KNF’s Laboratory Symposium Offered an Evening of Exploration and Learning

Last week, KNF Neuberger Inc. hosted a Laboratory Pumps and Applications Symposium in collaboration with the Trenton Section of American Chemical Society (ACS). The event, a first of its kind, attracted attendees from local academia and industry.

Beginning in the early evening, the Lab Symposium kicked-off with a mixer featuring beverages and hors d’oeuvres. Attendees became better acquainted with each other, and more familiar with KNF laboratory equipment which was on display throughout the room. Soon after, guests were invited to a guided tour of KNF’s 50,000 square foot manufacturing facility. The tour, led by KNF Director of Sales and Marketing, Eric Pepe, allowed symposium guests to view important aspects of KNF’s pump production area including: assembly and testing stations, high-tech machining equipment, and state-of-the art inventory management systems.

Roland Anderson delivering the Laboratory Symposium presentation.

R. Anderson leads a discussion tailored to the applications employed by those in attendance.

Next, attendees were invited to help themselves to a complimentary hot buffet, featuring local Italian fare. Guests and staff carefully balanced plates, as they made way to their seats for the Laboratory Pumps and Applications presentation, delivered by KNF Laboratory Products Manager, and applications specialist, Roland Anderson (pictured right). The presentation featured a review of pump technologies, their pros/cons, and the benefits of their usage in several typical lab applications.

The evening was capped off with desserts and coffee, as well as a door prize drawing. Congratulations to the prize winners, and thank you to all who helped make this initial KNF Laboratory Pumps and Applications Symposium a success!

If you would like to schedule a similar KNF lunch-and-learn symposium with KNF, at your facility, please contact a laboratory applications specialist.

 

 

KNF to Host Lab Pumps & Applications Symposium in Collaboration with Local ACS

Pumps are an important component in practically all chemistry laboratories. Yet for such a common device, selecting the correct pump for a particular application is often a challenge.

Join us for a Laboratory Pumps and Applications Symposium

Join us on Nov. 4th for a Laboratory Pumps & Applications Symposium

KNF Neuberger, in collaboration with the Trenton Section of the American Chemical Society, will be hosting a symposium on “Laboratory Pumps and Applications”. The presentation will focus on taking the mystery out of laboratory pumps, looking at the most common applications and the pumps that best support them. Discussion topics include:

  • What is the best pump type for my application?
  • What accessories are available to help me optimize the performance of the pump in my application?
  • What are the signs that my pump is in need of maintenance or repair?
  • And much more!


LOCATION

This exclusive, co-sponsored event will be held at KNF’s state-of-the-art, 50,000 square ft. manufacturing facility at Two Black Forest Road in Trenton, NJ.

SCHEDULE
5:30 pm – Mixer with drinks and appetizers, plant tours and product demos
6:30 pm – Dinner and presentation
7:30 pm – Coffee and dessert
Refreshments and dinner are complimentary. There will also be a drawing for door prizes.

PRESENTER
Roland Anderson is the Laboratory Products Manager and applications specialist at KNF Neuberger, Inc.

RSVP
Reservations are required, as seating is limited, so be sure to register now!