CRP has recently started commercial production of large diameter pipe fittings (up to 14 inches) for the chemical processing industry that are lined in DuPont™ Teflon® PFA fluoropolymer resin. It uses Teflon® PFA because it provides the highest resistance to permeation of all of the fluoropolymers and is the material of choice for the most aggressive conditions.
Responding to market requirements, CRP has worked to increase the size range of pipe-fittings lined with Teflon® PFA from 6 inch (DN150) to 14 inch (DN350) – a four-fold increase in product scale.
“It is no small achievement to create the ability to transfer mould 25 kilogrammes of PFA, to get it to where it needs to be and then cool it, all with the lowest melt flow rate PFA,” explains Michael Bruemmer, sales and marketing director at CRP. “We have found Teflon® PFA 350T-J to be the most reliable consistent material for this process, having great thermal stability, resistance to stress cracking and a generally very forgiving character in use. Moreover, with a translucent polymer the results look great and speak for themselves.”
PFA also facilitates installation, not only with regard to its one-piece design, but also because PFA moulded flanges do not exhibit the classical memory effect, enabling fittings be taken out of line without worrying about flare faces lifting. Moreover, the superior creep performance of Teflon® PFA means that flanges require much less re-tightening to achieve a seal in process. The fittings can withstand the full pressure requirement of ASME B16.5 group 1.1 materials of 14 bar at a maximum temperature of 200°C.
Process pipework used in multi-purpose pharmaceutical plants is often required to convey different materials. The exceptionally smooth surface and low wettability of Teflon® PFA assists both cleaning and changeover. Similarly, during high-purity sulphuric and hydrofluoric acid production, the cleanliness of PFA is a key attribute, as Michael Bruemmer confirms: “One of our customers working in the semi-conductor industry measures contamination in terms of parts per trillion – the equivalent of one drop of water in 20 Olympic-sized swimming pools. The ultra high-purity of Teflon® PFA can provide confidence in such cases that no contamination of the process media can occur.”
For its customers conveying non-conducting materials such as solvents, CRP has already proven 14 inch sizes using Teflon® PFA C-980, the conductive “anti-static” grade of PFA from DuPont. The material’s excellent conductivity allows the discharge of electrostatic charges generated within pipelines.
“Of all of the superior attributes provided by Teflon® PFA in these applications, it is perhaps permeation performance that has proven to be the most important,” concludes Michael Bruemmer. “Liner collapse through permeation and inadequate venting can lead to significant plant failures and extended shutdowns – something that none of our customers want. One of our key customers, working with particularly permeant substances, specifies vent bosses with PTFE plugs on all of their PTFE-lined pipe spools in order to manage the permeant liquid through the piping system. This same customer doesn’t bother with the venting system on the adjacent PFA fittings because of their experience of reduced permeation through these fittings. Proof if it was needed.”Established in 1983, CRP manufacture and supply PTFE and PFA lined piping, PFA lined valves, PTFE bellows, sight glasses and sampling systems for the chemical, pharmaceutical and associated processing industries. The United Kingdom's largest manufacturer of PTFE lined pipe, all of its lining processes are conducted and controlled at their facility in Northern England. CRP is supported with qualified manufacturing distributors around the world.
DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802. The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment. For additional information about DuPont and its commitment to inclusive innovation, please visit www.dupont.com.The DuPont Oval Logo, DuPont™, The miracles of science™ and Teflon® are registered trademarks or trademarks of DuPont or its affiliates.
Scientists from Hannover develop a novel lightweight production process
27.09.2017 | IPH - Institut für Integrierte Produktion Hannover gGmbH
PRESTO – Highly Dynamic Powerhouses
15.05.2017 | JULABO GmbH
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
12.12.2017 | Physics and Astronomy
12.12.2017 | Earth Sciences
12.12.2017 | Power and Electrical Engineering