Keep detailed records of all pump maintenance including routine maintenance and vendor-provided services. Contact us at ehrs@ehrs.upenn.eduif you have any questions about your vacuum pumpset-up. The pump pulls the last volatiles residues out of your syrup, crystals, or powder, leaving you with a dry weight that you can use to check your reaction yield, get pure spectra of the material, and so on.The pump was making a different sound than usual. Selecting the right vacuum technology for chemical and pharmaceutical processing applications is often difficult. Allow the trap to warm up tp the room temperature before disposing of any solvents. Learn the ins and outs of how AODD pumps work in this webinar. A liquid sealant flows through the vacuum pump, and the rotation of the impeller creates a liquid ring on the inside of the housing that seals the spaces between the individual impeller blades. In the recent past, a process engineer had few things to consider when choosing a vacuum source for a process requiring less than atmospheric pressure. Liquid ring vacuum pumps are available in different configurations and shaft seal arrangements, and in many materials of construction, from simple to exotic. The pumped medium is trapped between the cylinder and screw chambers, compressed and transported to the gas outlet. In some applications, it is also recommended to flush the vacuum pump with a suitable cleaning fluid to remove process material that are in the pump prior to shutdown to avoid deposits forming as the pump cools. These pumps have proven to be robust and reliable in chemical processes. Provides features, benefits, accessories, and ordering information on CentriVap micro IR, Benchtop, Refrigerated, Acid-Resistant, Cold Traps, Proteomic Systems, DNA, Mobile Systems, and Complete Systems. In a screw vacuum pump, two screw-shaped rotors rotate in opposite directions. Keep up with the latest Labconco news and happenings. And I went about the rest of my merry morning's work.The next morning, I wandered into the lab yet again. Surely not. They, The Lemcom vacuum pump (photo) is said to be the worlds first vacuum pump with functionality for communicating mechatronics, making, Scrolling or Pushing? Derek Lowe, an Arkansan by birth, got his BA from Hendrix College and his PhD in organic chemistry from Duke before spending time in Germany on a Humboldt Fellowship on his post-doc. Water is usually used to create the liquid ring. . Here is the original article published in August 1993. Print Diaphragm Vacuum Pumps are sized for use with CentriVap Centrifugal Concentrators, RapidVap Vacuum Evaporation Systems and Vacuum Diesiccators. It is important to consult with a vacuum expert and consider process conditions, process gases and integration into process control, as well as economic efficiency, safety and reliability. Precise manufacturing and minimal clearance between the moving parts enable this operating principle and, in addition, guarantees a low ultimate pressure of less than 0.1 Torr. Decrease SizeIncrease Size These pumps have an advantage since they do not require operating fluid to compress the process gas. .then I remembered a Moroccan biochemist from another group who came over sometimes to hang out with the guy around the corner from me. | Privacy Policy | Diversity Inclusion & Equity, White Biotech safeguarding the future of generations, FLOWSIC100 Flare-XT: Ultrasonic flare gas measurement, The recent decision by the U.S. Supreme Court limiting the, Understanding the working principles of scrolling and pushing centrifuges can, New hardware combined with monitoring technologies can help optimize combustion, Conventional gas-separation membranes normally exhibit a trade-off between selectivity and, A new class of adhesives being developed by the startup, Biomethane Last month, NextChem, a subsidiary of Maire Tecnimont S.p.A., Last month, operation began at Polar Night Energy Oys (Tampere,, Circular dichroism (CD) is the established method for distinguishing between, In an advancement toward circularity for commodity plastics, researchers at, Currently, enhanced biological phosphorus removal (EBPR) techniques in municipal wastewater-treatment, An interdisciplinary team of biologists, chemists and engineers from the, Cyclopropane-functionalized hydrocarbons can be excellent fuels because of their high, Plant Watch Johnson Matthey to build U.K. gigafactory for H2, Henry Kister shares lessons learned from troubleshooting distillation towers In, Ethernet Advanced Physical Layer (APL) provides connectivity between field-generated data, Heat transfer fluids (HTFs) provide heating and cooling of process, Advances in sliding-vane and internal-gear seal-less pump technologies can provide, Compliance with industry- and machinery-specific safety standards and classifications is, A portable pipe beveling tool prepares pipe for welding The, Achema (www.achema.de), the global forum for the chemical engineering and, Transparent polymer film started with an accident . Modern screw vacuum pumps have a variable pitch screw, which results in even compression of the process gas across the entire length of the screw. And as I walked past the vacuum pump, I noticed something a little odd.For those who don't work in a synthetic chemistry lab, the vacuum pump is where you put flasks of stuff after you've evaporated most of the solvent off of them. Within the TurboLab series, the compact tabletop unit fills the gap for entry-level vacuum needs that require a clean, dry, stable source of high and ultra-high vacuum. This flyer describes the VACUUBRAND BVC Control and Basic Fluid Aspiration Systems. are generally not considered practical or economical for rough vacuum uses, such as those found in chemical and pharmaceutical applications. Place the trap carefully into dewar half filled with liquid nitrogen and open the valve. 2022 American Association for the Advancement of Science. Suite 400 How to Handwash, Handrub and Remove Gloves? I wandered into the lab one Saturday morning while I was in graduate school - (OK, scratch that, I wandered into the lab most Saturday mornings while I was in graduate school, which was one of the things I hated about it.) Use a second cold trap between the pump and the experiment tominimizethe amount of volatile chemicals reaching the pump. This will also help to protect the pump from damage caused by degradation and contamination of the pump oil. See Fact Sheet: Vacuum Pump Use and Installation for more information about pump setup and use of cold traps. . An editorially independent blog, all content is Dereks own, and he does not in any way speak for his employer. The injected lubricant continually flushes the vacuum pump during operation, protecting it from corrosion and deposits. Processing & Handling, By Mary Page Bailey and Gerald Ondrey | January 1, 2022, TurboLab Core (photo) is a small plug-and-play high-vacuum pumping system for research and laboratory and industrial applications. Combination vacuum pumps are corrosion resistent rotary vane/diaphragm vacuum pumps designed for use with acidic samples and harsh chemicals. This process takes place in both compression stages before the process gas is discharged with the operating fluid via the outlet where the lubricant is collected in the silencer for draining. If the cold trap is likely to have condensed toxic or corrosive vapors, the entire assembly must be placed in the fume hood overnight. This webinar covers vacuum basics including gas laws, vacuum measurements, vacuum pump sizing and much more. At the time, he had 20 years of experience in cost estimating, financial analysis, government compliance standards and major engineering projects for the chemical and pharmaceutical industries. The main purpose for selecting a multistage pump is to efficiently operate in systems that require a high total head. This is important when the system is placed close to a microscope or other precision laboratory equipment. Many factors help determine the best type for your application. All rights reserved. This means the process gas does not heat up to a notable degree and the vacuum pump operates at relatively low temperatures, significantly reduceing the risk of unwanted reactions. Hes worked for several major pharmaceutical companies since 1989 on drug discovery projects against schizophrenia, Alzheimers, diabetes, osteoporosis and other diseases. (2007). In his latest column, Amin Almasi discusses BEP's relationship to the sizing, selection, control and operation of pumps. Philadelphia, PA 19104, E ehrs@ehrs.upenn.edu Connect a clean and dry trap to the pump and to the vaccum line (grease it). Carefully remove the dewar with liquid nitrogen and turn off the pump (read below!). Always close the valve between the vaccum vessel and the pump before shutting off the pump. There was the poor vacuum pump, trying to evacuate the air out of the state of North Carolina again.I went stomping through our labs, looking for the culprit. For liquid nitrogen, use also: full face shield and gloves for cryogenic substances. These rotary vane vacuum pumps are rotating positive displacement pumps. (I was there most Sunday mornings, too, damn it all.) Helpful articles to assist in product selection, use, and configuration. Based on the information provided by the witnesses and responders, the most likely direct cause of the explosion was the ignition of an explosive concentration of diethyl ether vapor expelled from the pump exhaust. The source of ignition may have been either a spark from the pump motor or from the cooling fan inside the cabinet, both of which are controlled by the same power switch. Diethyl ether, which was evaporated using this system earlier in the day, may have been pulled into the vacuum pump and then been exhausted into the cabinet. The vapor from the pump exhaust could have ignited when the student flipped the toggle switch to energize the pump and cooling fan. Labconco Corporation The recirculating coolant version uses a thermostat to control the pump temperature. Any rotary evaporator systems that are using rotary vane pumps should be reviewed to determine whether the vacuum pressure is appropriate to the application and is well controlled. A less powerful vacuum pump with more precise vacuum control (such as a diaphragm pump) is more appropriate for rotary evaporation of low boiling solvents. Diaphragm pumps offer advantages including their small size, chemical-resistance, and ability to fit next to the rotavapor in the fume hood. For guidance on selecting the best vacuum pump for your application, see Labconcos, How to Select the Right Vacuum Pump, Lab Manager Magazines Independent Guide to Purchasing a Vacuum Pump., It is important to select the right pressure and temperature when condensing solvent vapor in rotary evaporation. For a sufficient condensation of the vapor, you should set the cooling temperature at about 20. et the bath temperature at 50C to yield a solvent vapor temperature of 30C, which is subsequently condensed at 10C. For whatever reason, our apparatus went unmolested after that. Flushing capability is another characteristic of the dry screw pump that arises, because the pump does not use an operating fluid. So I twisted the glass stopcock closed, muttering foul gerunds, and left an unpleasant note taped to it. The rotary vane vacuum pumps have three distinguishing features when compared to other vacuum pumps that operate with the rotary vane principle: Two compression stages are stacked and connected to each other, facilitating initial compression of the process gas in the first stage and secondary compression in the subsequent stage, achieving a lower ultimate pressure. In most applications, it is recommended to warm the pump prior to process operation and purge the pump with inert noncondensable gas (generally nitrogen) to remove the process vapor prior to shutdown. For 5248201 Diaphragm Vacuum Pump Assembly (5117105 Vacuum Pump), For 773940x Series and 1472100 model and 1467700 model Rotary Vacuum Pumps. The liquid ring vacuum pump can be operated as a simple continuous sealant flow system, or a partial or total recirculation sealant system. With the dewar lowered and the system closed to air, turn the vaccum pump on and ensure vaccum preformance is leak free. Comment How to Choose the Best Vacuum Pump for Chemical and Pharmaceutical Processes, Podcast: Turbomachinery & Pump Symposia Talk, Plus August Issue Preview. As the impeller continues to rotate, the volume of these spaces is reduced, the vapor is compressed and then discharged through the exhaust port. The vanes are placed in slots in a rotor, which rotates eccentrically in a cylindrical housing. He is head of marketing services at Busch Dienste GmbH in Germany, part of the international group of Busch Vacuum Pumps and Systems. for guidance on vacuum pump maintenance requirements. They aren't cheap, and we spent time fixing the ones we had rather than attempt to ever buy new ones. . This has the advantage of ensuring the same temperature throughout the entire compression chamber, which can easily be monitored and controlled. Labconco offers a number of vacuum pump types, including Rotary Vane Pumps, Combination Pumps, Diaphragm Pumps and Scroll Pumps. Something about how if you were the last user of this pump, you left the procreating stopcock open, and you shouldn't reproducing do that, etc. A two-stage once-through oil-lubricated rotary vane vacuum pump was developed in the 1960s and was designed for chemical and pharmaceutical processing. He gave me a big grin: "No, I have not used this pump. Product Service is ready to help with installation questions, troubleshooting and replacement parts for your existing Labconco equipment. Always make sure the trap is removed from liquid nitrogen prior to turning off vaccum, as there is a potential for the formation if liquid oxigen (blue color), in nitrogen cooled vessels - it may cause serious explosion!!! During the compression process the screw rotors do not contact each other or the cylinder. Maybe. Dry screw vacuum technology is widely used in the chemical and pharmaceutical industries. If liquid oxygen (blue color) is suspected to have been condensed, call 08-934-2999 immediately. F (215) 898-0140, 2022University of Pennsylvania Environmental Health & Radiation Safety | Report accessibility issues & get help, Vacuum Pump Explosion in Chemistry Building. Henry H. Hesser was a staff technical specialist at Busch, Inc. when this article was first published in Pumps & Systems in August 1993. All vacuum exhaust must be properly vented and include sufficient condensing capacity prior to the pump. The exhaust ports of pumps stored in vacuum pump cabinets must be connected directly to the vent port inside the cabinet. The pump may not vent into the cabinet interior. Seephoto for example of proper setup. On the evening of August 14, 2020, a Chemistry graduate student was attempting to evaporate ethyl acetate and hexane using a Buchi Rotavapor (R-200) connected to a Savant VP100 rotary-vane roughing pump. The vacuum pump was located in a designated pump cabinet in the base of the fume hood, and power to the cabinet was controlled by a toggle switch on the face of the fume hood., The student was alone in the lab at 6:30 PM when he engaged the power switch on the hood to turn on the vacuum pump. He reports that the vacuum monitor on the rotary evaporator indicated that the pump was not supplying vacuum, so he turned off the power switch. When he flipped the switch back on, he heard a loud bang and saw the cabinet door burst open. The vacuum pump was on fire, producing orange flames and black smoke.. Guest columnist Gary Dyson explains how improper installation can compromise the system. Provides at-a-glance decision tree, features and benefits, specifications, and evaporation rates of the RapidVap Vertex, RapidVap Vacuum, RapidVap N2 and RapidVap N2/48 Evaporation Systems. My testy reply was that if I found out that he'd been leaving the pump open then he would be sucking ze air, yes. Diaphragm Vacuum Pumps are sized for use with CentriVap Centrifugal Concentrators, RapidVap Vacuum Evaporation Systems and Vacuum Desiccators. Visual guides to safety best practices and product selection. Turbo Lab's Greg Gammon, director of global & corporate partnerships, gives pump industry updates. The Golden Rule for Solvent Removal for more information. Also, refer to the following Buchi recommendations for rotavap use and optimal settings (See section 5.8 in the BCHI Rotavapor R-200/205 manual.). See Fact Sheet: Vacuum Pump Use and Installation for guidance on vacuum pump maintenance requirements. One of them was wide open, and the reason the pump was making that unusual sound was that it was trying to pump the air out of the entire chemistry building.That isn't good for them. The Vacuum Pump Selection Guide provides helpful information on choosing the right pump for your laboratory product. Rotary Vane Direct Drive Vacuum Pumps provide a reliable vacuum source for a variety of laboratory products including FreeZone Freeze Dryers, Protector Controlled Atmosphere Glove Boxes and CentriVap Centrifugal Concentrators. The first dry screw vacuum pump for use in the chemical and pharmaceutical markets was launched in the 1990s. Should You Repair or Replace Aging Sewer & Septic Systems? Certain articles contain the author's personal recommendations only. Accessories are also described. The operating fluid in the compression chamber continuously dissipates the compression heat, so the vacuum pump operates nearly isothermally. When Is it Appropriate to Use a Multistage Pump? With different compression systems and various coatings, screw vacuum pumps can be configured to be compatible with any chemical. Standard Laboratory Safe Handling/Storage Requirements, Safety Instructions for Hydrogenation Laboratory. How IIoT Early Anomaly Detection Increases Reliability & Productivity, Software Helps Water Utility Avoid Unplanned Downtime, Basics of AODD Pumps & the Technical Advantages, Vacuum Technology Fundamentals & Innovations, Increasing the Lifespan & Reliability of Electronic Components, In-depth articles on pump industry issues, Expert insights into important topics in the field, effluent considerations (Clean Air Act and Clean Water Act), potential for recycling or recovery of solvents and materials removed with the vacuum stream, energy requirements and methods of reduction, expandability and flexibility of adding or subtracting capacity, dry compression, no contamination or reaction possible between process gas and operating fluid, can be designed for nearly all process gases thanks to material selection and temperature regulation, sensitive to particles entering the system, requires special considerations when used with process gases that tend to be reactive at high temperatures, not sensitive at all to vapor or liquid entering the system, materials of construction can be tailored to the process gas, possible contamination of the operating fluid with condensate from the process gas, affecting performance and making it necessary to subsequently treat the operating fluid before its disposal, ultimate pressure depends on the vapor pressure of the operating fluid, suited for conveying acid vapors and monomers or products that lead to polymerization when other vacuum technologies are used, operating fluids must be treated or correctly disposed of. These pumps are normally applied in high vacuum industries like semiconductor manufacturing. Cost, reliability, vacuum level and experience in similar processes were about all that mattered. And as I walked past the pump, I could swear that something was odd yet again. for more information about pump setup and use of cold traps. Copyright Cahaba Media Group, Inc. All Rights Reserved. The student was not standing in front of the cabinet when the explosion occurred and, as a result, was uninjured. The fire alarm was activated, and the fire department extinguished the fire using water. These pumps are water cooled, allowing the operating temperature to be regulated within a certain range. AAAS is a partner of HINARI, AGORA, OARE, CHORUS, CLOCKSS, CrossRef and COUNTER. As stated, a small amount of lubricant is continuously injected into the pumping chamber and vane slots to provide lubrication for the vanes and improve the seal. I went back, looked it over, but couldn't see anything out of whack. The benefits of dry screw, liquid ring and rotary vane vacuum pumps. if you have any questions about your vacuum pumpset-up. The slackjaw that did it it had to hold the note up to get to the stopcock, which really defied belief. 2022, Access Intelligence, LLC. This enables the process gas to avoid contamination by, or reaction with, an operating fluid, as well as preventing corrosion due to process liquids attacking the pump materials. Guidance to Supervisors - Staff with COVID-19 Health Questions, Research Resumption: Lab PPE and Preventing COVID-19 Transmission in Penn Labs, Lab Cleaning and Disinfection COVID-19 Guidance, Reordering Information for COVID-19 Transmission Prevention Supplies, BSL-2 Enhanced Training for Processing COVID-19 Patient Specimens, Close Proximity Work Standard Operating Procedure, Eating and Use of Conference Rooms - Best Practices, Wastewater Monitoring: Spring 2021 Pilot Program - FAQ, Face Coverings, Masks and Respirators Compared, Mask and General PPE Guidance for Essential Penn Laboratory Personnel, Precautions for the Distribution of University Supplied Face Masks, Recommendations for cleaning labs with Suspected/Confirmed COVID-19 cases, EHRS COVID-19 Guidance for FRES and Housekeeping, EHRS COVID-19 Guidance for Security and Delivery Activities. Liquid ring vacuum pumps are rotating positive displacement pumps with an impeller that is eccentrically placed in a cylindrical housing. RELIANCE ON ANY INFORMATION SUPPLIED IN THIS PUBLICATION IS SOLELY AT YOUR OWN RISK. PrimeMate Oil Change Systems, Chemical Traps, Dry Ice Traps, Liquid Nitrogen Traps and Liquid Traps are available, as well as the necessary tubing and tubing accessories. Other such pumps use oil circulating lubrication. The ergonomic system includes the oil- and maintenance-free Turbovac i turbomolecular pump, the Divac 1.4 dry diaphragm backing pump and a simple controller, which can also serve as a speed and pressure display. Any rotary evaporator systems that are using rotary vane pumps should be reviewed to determine whether the vacuum pressure is appropriate to the application and is well controlled. A less powerful vacuum pump with more precise vacuum control (such as a diaphragm pump) is more appropriate for rotary evaporation of low boiling solvents. Diaphragm pumps offer advantages including their small size, chemical-resistance, and ability to fit next to the rotavapor in the fume hood. For guidance on selecting the best vacuum pump for your application, see Labconcos How to Select the Right Vacuum Pump and Lab Manager Magazines Independent Guide to Purchasing a Vacuum Pump., It is important to select the right pressure and temperature when condensing solvent vapor in rotary evaporation. For a sufficient condensation of the vapor, you should set the cooling temperature at about 20C lower than the vapor temperature. This is known as the Delta 20 Rule: set the bath temperature at 50C to yield a solvent vapor temperature of 30C, which is subsequently condensed at 10C. Screw vacuum pumps use a cooling jacket, ensuring even temperature distribution and greater thermal efficiency and stability throughout the pump body. A general, economical rotary vane vacuum pump for a variety of laboratory equipment. Ethylene glycol, mineral oils or organic solvents are also often used in practice. Things I Won't Work With: Dioxygen Difluoride, Mercury Vapor Pumps for Vacuum Distillations, Vacuum Filtration of Large Volumes in the Laboratory. Empty the condenser trap immediately after evaporation is complete to eliminate the possibility that solvent will evaporate as the condenser warms to room temperature. Contains specifications, dimensional drawings and ordering information on Labconco's line of Precise Glove Boxes and XPert Weigh Boxes.
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