MATERIALS HANDLING
move it out of spec. Lobe pumps, since they are not true PD pumps, can be subject to product slippage, which will make attaining consistent flow problematic and result in compromised production rates. In total, pneumatically driven AODD pumps possess many attributes that most electronically driven pumps do not, including portable design, seal-less operation, dry-run and deadhead capabilities, good suction-lift capability, ability to handle a wide product viscosity range, ability to handle small particulates, control without need of a variable frequency drive (VFD), easy grounding, and simple operation, maintenance and repair.
THE SOLUTION
Although other PD-pump technologies have shortcomings when handling high- purity chemicals, the AODD pump does not come with such concerns. Specifically, solid-body plastic AODD pumps that are CNC-machined are the preferred choice over their injection-moulded cousins. Te CNC-based design enables tight tolerances, reduced vibration, lower risk of leakage, and greater stability and durability. In general, solid-body AODD pumps are stronger and have a longer life cycle with less required and easier maintenance. Injection-moulded plastic pumps, on the other hand, can have small cavities or crevices in the body where liquids can accumulate and potential leak paths can be created. During their operation, injection- moulded pumps can also vibrate or bounce more than solid-body models, which can
Other positive displacement pump styles such as gear and lobe will lose volumetric consistency over time, leading to higher operating costs. By the nature of their operation, Almatec’s pumps reliably maintain their flow rates throughout their lifespan, resulting in optimised production cycles and energy usage
loosen pipework and increase the chances that a leak path will form. Solid-body plastic AODD pumps can also be constructed of high-quality materials such as polytetrafluoroethylene (PTFE) that are specifically compatible with the chemicals that are being handled, which eliminates corrosion and leak concerns. Te overall design and operation of AODD pumps gives them dry-run capability and good controllability, while they are seal-less. Teir compressible drive medium permits gentle delivery with attenuated pressure peaks. Start-up is simple and the space required is considerably less than in the case of piston-actuated diaphragm pumps or screw pumps. Almatec Maschinenbau is the inventor of plastic solid-body AODD pumps and offers an extensive product range. In the handling and transfer of high-purity chemicals, Almatec recommends its E-Series AODD Pumps. E-Series pumps offer a range of features and benefits for manufacturers and users of high-purity chemicals.
During their operation, injection-moulded AODD pumps can vibrate and bounce, which can loosen pipework and increase the chances of a chemical leak. Almatec solid-body AODD pumps are more stable during their operation, which leads to a higher level of product containment
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IN CONCLUSION Admittedly, there is a science-fiction “out there” feeling to many of today’s high-purity chemicals with fertile, inquisitive minds needed to develop them and find their uses. What is firmly rooted in reality, however, is the need to manufacture and handle them in accordance with a strict set of specifications that cannot be compromised. Tat’s why guaranteeing their purity and quality is job Number 1 for their manufacturers. Tose
concerns can be overcome through the use of pumping equipment that has been designed to achieve reliable production of high-purity chemicals. Although other pump technologies can claim to do this, it’s the plastic solid-body AODD pumps, specifically the E-Series model from Almatec, that can turn those claims into reality.
Any high-purity chemicals can cause compatibility concerns when used with certain types of pumps. Almatec E-Series pumps can be constructed of plastic materials that are specifically compatible with the chemicals that are being handled, which eliminates cross- contamination and leak fears
Tom Zuckett is with Almatec.
www.psgdover.com/almatec
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