PhD's

Roy Visser

ctw/pt

Contact Information

h.a.visser@ctw.utwente.nl



PhD Project:

Development of a condition measurement method for polymer gas pipes.


Start / End:

1st September 2005 to 31st December 2009


Partners:

The partners in this project are:

Cogas Infra & Beheer BV

Liander

Enexis

Stedin

KWR


Liander, a gas and electric network service provider, initiated this PhD study, in which three other network service providers (Cogas Infra & Beheer, Enexis and Stedin) participated. The research is carried out at both the University of Twente and the Technical University of Eindhoven.


Summary:

In 1959 a large amount of natural gas was found in Slochteren in the northern part of the Netherlands. This discovery led to major investments in the installation of thousands of kilometres of pipe to form an extensive piping network. The majority of these pipes are still in use. About 15 percent of the current gas distribution network is made of unplasticised or rigid poly(vinyl chloride) (uPVC) and has been installed in the period between 1959 and 1974. The lifetime of these of the pipes was expected to be around fifty years at the time of instalment. Even after forty years in service, the network service providers barely experience problems with this part of the network. Therefore, the question arises whether it is possible to replace the pipes based on their residual quality in stead of their service life time. This new approach can improve the efficiency of the replacement policy and increase the integrity of the network.


The residual quality of the uPVC pipes is determined by its fracture toughness. The main focus in this study will be on the process of physical aging. During this process the yield stress of the polymer increases. As a result plastic deformation occurs on a more local scale, which finally will result in (macroscopic) brittle behaviour, and thus a decreased fracture toughness. The influence of physical aging on the yield behaviour of uPVC is modelled and validated using various experimental techniques (e.g. tensile, compression, impact and indentation tests).


Related research:

Marlous Alberts – Breukmechanica aan kunststof gasleidingen

Rianne Daalmijer – Krasexperimenten ter bepaling van de vloeispanning van polymeren


Thesis:

H.A. Visser, RESIDUAL LIFETIME ASSESSMENT OF UPVC GAS PIPES, PhD thesis University of Twente, 2010, ISBN 978-90-365-2958-7.

Roy-11-2009-3


Journal papers:

H.A. Visser, T.C. Bor, M. Wolters, L.E. Govaert; The influence of physical ageing on the yield behaviour of unplasticised poly(vinyl chloride); Macromolecular Materials and Engineering, 295 (7). pp. 637-651, 2010


H.A. Visser, T.C. Bor, M. Wolters, T.A.P. Engels, L.E. Govaert; Lifetime assessment of load-bearing polymer glasses; An analytical framework for ductile failure, Macromolecular Materials and Engineering, submitted


H.A. Visser, L.L. Warnet, R. Akkerman; An attempt to use scratch tests to predict the residual lifetime of unplasticised poly(vinyl chloride) pipes; Engineering Fracture Mechanics, 76 (18). pp. 2698-2710, 2009


Conference papers:

H.A. Visser, T.C. Bor, M. Wolters, L.E. Govaert; The influence of physical ageing on yielding and failure of unplasticised poly(vinyl chloride) pipes, Proceedings of DYFP, Rolduc Kerkrade, the Netherlands, 2009


H.A. Visser, R.J.M. Hermkens, M. Wolters, J. Weller, L.L. Warnet; Excellent impact performance of PVC pipeline materials in gas distribution networks after many years of service, Proceedings of IGRC 2008, Paris, France, 2008


R.J.M. Hermkens, M. Wolters, J. Weller, H.A. Visser; PVC pipes in gas distribution: Still going strong!; Plastic Pipes XIV, Budapest, 2008


H.A. Visser, M. Wolters, T.C. Bor, T.A.P. Engels, L.E. Govaert, A new engineering approach to predict the long-term hydrostatic strength of uplasticized poly(vinyl chloride) pipes, Proceedings of 10th International PVC Conference, IOM communications, Brighton, United Kingdom, 2008, pages: 377-387


H.A. Visser, T.A.P. Engels, L.E. Govaert, T.C. Bor, A new engineering approach to predict the hydrostatic strength of uPVC pipes, Proceedings of PPS07 EA, Gothenburg, Sweden, 2007


Posters:

H.A. Visser, T.C. Bor, L.C.A. van Breemen, R. Akkerman; Condition monitoring of uPVC gas pipes, Engineering Mechanics symposium, Lunteren, the Netherlands, 2009


H.A. Visser, T.C. Bor, M. Wolters, L.E. Govaert; Can physical ageing cause embrittlement of our gas distribution network?, Internal Poster MaTe, TU/e, 2008


H.A. Visser, T.C. Bor, L.L. Warnet, R. Akkerman, Ductile or brittle? The impact behaviour of uPVC upon ageing, Engineering Mechanics symposium, Lunteren, the Netherlands, 2008


H.A. Visser, R.J.M. Hermkens, M. Wolters, J. Weller, L.L. Warnet; Excellent impact performance of PVC pipeline materials in gas distribution networks after many years of service, Proceedings of IGRC 2008, Paris, France, 2008


H.A. Visser, T.A.P. Engels, L.E. Govaert, Predicting failure of pressurized uPVC pipes, Internal Poster MaTe, TU/e, 2007


H.A. Visser, T.A.P. Engels, L.E. Govaert, T.C. Bor, A new engineering approach to predict the long-term hydrostatic strength of uPVC pipes, Engineering Mechanics symposium, Lunteren, the Netherlands, 2007


Now:

Roy Visser is since 2010 linked to the Chair of Production Technology as an assistant Professor.