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.
"We're hoping for up to 600 kilometers per hour"
15.06.2018 | Technische Universität München
Flow probes from the 3D printer
25.05.2018 | Technische Universität München
In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.
Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...
Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
20.06.2018 | Information Technology
20.06.2018 | Materials Sciences
20.06.2018 | Life Sciences