Daniel Ejdeholm, Karin Jacobson
Papers # 2014 Chicago
Since decades, non-metallics have been the preferred choice of material to be used in the process equipment of pickling plants to cope with the metal-corrosive environments. The present experience regarding the corrosion performance of different plastic materials in various pickling applications and elsewhere has mostly been gained by full-scale use of the process components under actual service. This study is a part of the project “Cost effective and reliable use of plastic and other non-metallics in pickling plants – Corrosion resistance and long-term performance” carried out at Swerea KIMAB, whose ultimate goal is to improve service reliability of polymeric materials when used in pickling environment. The overall aim for this study has been to reach a deeper understanding of the corrosion behaviour of polypropylene in mixed acid (HF+ HNO3). Mixed acid is used for the pickling of stainless steel and due to reasonable price/performance polypropylene is one of the most commonly used pipe materials for this application.
In our study it was found that PPH-β and PPB has a better resistance to the mixed acid environment both regarding corrosion rate and retained impact strength compared to PPH-α and PPR. The study included both pipes that had been in service and pipes that had been exposed to accelerated testing in the laboratory.
There are great potentials in economical savings as well as in safety and reliability for process equipment in pickling plants when having relevant material data to rely on when choosing pipe material.
Related papers
Author(s) : A. Marangoni
The quality of infrastructures is a key driver for maximizing the performance of the utilities networks and minimizing the environmental impacts associated with their operation. The water and sewer pipes are key network elements to guarantee a satisfactory service to the citizens. Their end-of-life management is an...
Author(s) : Saleem Shakir
Unplasticized formulations based on Poly(Vinyl Chloride) (PVC) and Chlorinated Poly(Vinyl Chloride) (CPVC) resins offer technical solution to pressure piping systems that find extensive use in residential and industrial applications. Building upon the desirable properties of the vinyl monomer, the chlorine content of...
Author(s) : Antonio Rodolfo Jr., Vanderley M. John
Unplasticised (U-PVC) and modified (M-PVC) pipes used in irrigation and infrastructure applications, outside diameter 326 mm, were evaluated according to various fracture mechanics methodologies, including fracture toughness (stress intensity factor KC and energy release rate GC, both at fracture), essential work of...
Author(s) : C. Losher and P.V. Mercea
In the framework of the German Environmental Agency (UBA) requirements of plastic articles in contact with drinking water (KTW-BWGL-guideline), the compliance is verified by comparing so-called “expected concentrations at tap”, C tap , of substances contained in the plastics with specific limits in drinking water...
Author(s) : Lukas Travnicek, Pavel Hutar, Jan Poduska, Andreas Frank, Florian Arbeiter, Jaroslav Kucera, Jiri Sadilek, Gerald Pinter, Lubos Nahlik
The application of recycled material in pressure piping systems has been considered lately – it was suggested, that the recycled polyethylene could be used as a part of a multilayer pipe together with virgin material. This type of pressure pipes is not availableon the market yet, so their properties can be only...
Author(s) : Yoshikatsu NISHIDA, Yukihisa YAMADA, Masaya IWASAKI, Masaru TOMOBE, Yuichi KOUGA
By using polyethylene as the main material for this fire extinguishing device pipe, a resin-made fire extinguishing device is developed that is maintenance-free for eight years and can cope with the abnormal heat generation of lithium ion batteries. In order to prevent the internal extinguishant from permeating and...
Author(s) : Sylvie Famelart, Vincent. Stone
In order to deliver to the market reliable and consistent information about PVC and the different PVC pipe solutions, a Training Package was developed a few years ago. The package was made up of a set of standalone PowerPoint slides, providing information on PVC-U and PVC-C pipe systems. Information on both general...
Author(s) : Argnani Claudio, Ing. Gianpaolo Contarini
...Clogging of the pipes can be experienced in sewer systems after a short period of service, due to the intrusion of roots from plants and trees. Plants, and in particular their roots, are attracted by the water flowing inside the pipes. These roots will strain the connections between pipes, in particular the sockets...
Author(s) : Ignacio Muñoz
“Food is the new oil and gas” is a rather bold statement, but everyday more and more people are concerned about food scarcity. Bringing irrigation to not productive lands will change the lives of the community and if it can be done with a cost effective and the most ecofriendly solution, even better. This case study...
Author(s) : Guido Quesada
An important breakthrough for belled PVC pipe was made around 2006, when the first versions an integral joint restraint were released, after about two years in development. This type of restraint comprises a casing, usually made of metal such as ductile iron or stainless steel, a rubber seal, and a “C” grip ring,...
Author(s) : Andreas Frank, Mario Messiha, Günter Dreiling, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Stuart Ramella, Frank Krause, Rudi Berning, Philippe Gabriëls, Alpay Aydemir, Thomas Koch, Florian Arbeiter, Gerald Pinter
The Cyclic Cracked Round Bar (CRB) Test has been applied to study the slow crack growth (SCG) resistance of virgin, recycled, and reprocessed PVC-U. This fracture mechanical test allows a quick ranking of the SCG resistance of PVC-U. A clear correlation between the K-value and the SCG resistance has been elaborated....
Author(s) : Dr. Stefan Fokken
NGO pressure and end of life disposal of PVC articles in the EU over 30 years ago, triggered intense discussion about the sustainable use of PVC and its additives. Stabiliser producers and downstream users of PVC stabiliser compounds base upon Lead and Cadmium based stabilisers have developed solutions ultimately...
Author(s) : Hua Ye, Sun Jin, Wei Ruoqi
As a safe, clean, low-carbon and reliable energy source, nuclear power, together with hydropower and coal power, constitutes the three pillars of the world's energy supply and play an important role in the world's energy structure.With the strong support of national policies, China's nuclear energy has entered a new...
Author(s) : E. Boccaleri, L. Palin, G. Rombolà, M. Milanesio
In the last decades, research on nanostructured materials as additives for plastics involved several polymeric matrices, but only limited studies and publications involve PVC. In this work, the context of rigid application of PVC (U-PVC) for pipes application was targeted, in order to test and evaluate the structural...
Author(s) : Hermann van Laak, Jan Heimink, Mario Messiha, Andreas Frank, Christoph Bruckner, Thomas Kratochvilla
For high pressure pipes above maximum operation pressure of 10 bar, this paper emphasizes PA-U12 as the easy to install alternative to steel. It underlines the superb performance of PA-U12 pipes for alternative installation techniques without need for a separate mechanical protection. An unplasticized polyamide 12...
Author(s) : Yilaing He, Tianjun Zhang
A new electrofusion PE belt is developed by reinforcing it with various layers of steel mesh. It’s of sandwich structure, consisting of steel mesh reinforcement, heating wire and polyethylene. One or more layers of steel mesh is encapsulated in the middle, and heating wire is embedded onto “inner side” of the belt....
Author(s) : Steven Folkman
A recent survey again confirms that PVC pipe has the lowest break rate when compared with break rates of ductile and cast iron, asbestos cement, steel, and concrete pipe. Other results of interest to water utilities and engineers are discussed. During 2017, Utah State University conducted a survey of utilities across...
Author(s) : Ignacio Muñoz
During the last years PVC-O has become a popular product in pipe business due to the huge improvements of mechanical properties of PVC after orientation. At the same time, CPVC has become an important choice for hot water conduits in in-house applications. Molecor has started a research program to evaluate the...
Author(s) : G.M. Quesada, K.H. Steinbruck
The benefits of molecularly oriented PVC pipe (PVC-O) are well known and documented. Numerous studies covering improved pipe impact, toughness, hydraulics, and life cycle have been published. There is less information about PVC-O pipe under pipeline hydraulic forces. The objective of this paper is to identify design...
Author(s) : Jiang Tongjun, Fu Zhimin, Yang Yuanjin
This paper introduces the application of CPVC pipe in fire sprinkler systems in China. The advantages and differences of CPVC pipe versus to galvanized steel pipes, the improvement of related laws and regulations and the market outlook are discussed. The overall result is a change in the upstream and downstream...
Members of the Association
