Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New pipe fittings from CRP bring the benefits of DuPont™ Teflon® PFA on a larger scale

22.06.2012
Teflon® PFA fluoropolymer resin is the material of choice for the most aggressive conditions that require heat and chemical resistance
Corrosion Resistant Products Ltd. (CRP) of Littleborough, United Kingdom, 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.

These new larger-sized fittings from CRP include a 90-degree elbow that is unique in terms of its use of PFA for the lining. CRP uses Teflon® PFA as it provides the highest resistance to permeation of all of the fluoropolymers and is the material of choice for the most aggressive conditions. Typical plants demanding large diameter fittings lined in PFA include vinyl chloride monomer plants producing PVC, chlor-alkali process plants and sites producing silicones, elastomers, solvents and chloro-methanes.

Photo: DuPont/CRP
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.”

Ivo Erren, sales representative at DuPont Fluoropolymer Solutions, confirms this view: “Teflon® PFA 350T-J and Teflon® PFA 450HP have become the material of choice for PFA lined products in both corrosive and highly permeating environments. Its almost universal chemical resistance combined with its smooth surface provides excellent cleanability make it a winner in the pharmaceutical industry.”

One of the most challenging parts in the new range from CRP is the 90 degree elbow, which is unique in its use of Teflon® PFA for the lining. In order to manufacture this, CRP has extended its range of investment cast steel castings, creating a one-piece (versus a more usual three-piece) design. This has the advantages of matching the ASME B16.5 dimensions favoured by industry and providing precise geometry for plant build.

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.

Teflon® is a registered trademark of DuPont used under license by CRP.

Note to the editor:
This press release is based upon information provided by:
Corrosion Resistant Products Ltd.
Contact: Nigel Price (Managing Director)
Todmorden Road
Littleborough. UK
OL15 9EG
Tel: +44 (0)1706 756402
Email: nigelp@crp.co.uk

Horst Ulrich Reimer | DuPont
Further information:
http://www.crp.co.uk
http://www.dupont.com

More articles from Machine Engineering:

nachricht Making lightweight construction suitable for series production
24.04.2017 | Laser Zentrum Hannover e.V.

nachricht It Takes Two: Structuring Metal Surfaces Efficiently with Lasers
15.03.2017 | Fraunhofer-Institut für Lasertechnik ILT

All articles from Machine Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>