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Grävskydd och djupförläggning som riskreducerande åtgärder vid förläggning av 10 bars PE-rörsystem: Del 2
Göteborg (BMg).
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik, Rörcentrum.
2012 (Swedish)Report (Refereed)
Abstract [sv]

This report concerns part 2 of a project with the aim to propose protective measures for cables and pipelines for bio and natural gas. The wish is to be able to increase the pressure in the distribution networks from 4 to 10 bars without having to retain the safety distances valid for 80 bar pipelines. Polymer, concrete and steel protective plates, and deep digging are the physical measures considered. In part 1 a survey was made, in part by an enquiry, of the frequency, causes and conse-quences of incidents where pipelines were hit by excavators. Further, the rules and standards were investigated in countries where 7-10 bar pipelines are already in service. Now a visit to a supplier in France is reported, as well as an investigation of costs and environmental impact of the different protective measures, and an analysis of the strength of protective plates and of how they can best be positioned in the ground in relationship to the pipeline. The main result from the study visit to France was that new regulations mean that both new and existing pipelines have to be satisfactorily protected. For the physical part of these plastic protective plates play an important part, and there are commercially available building systems of plates for which the strength and durability have been verified by tests. The analysis of costs and environmental impact shows that plastic plates are to prefer with regard to both aspects. In addition they have a very good signalling effect being produced in a bright yellow colour. Also deep digging can be effective taking into account environmental and costs aspects, but the risk reduction will according to literature be less than for the plates. Plastic plates are shown, in the literature surveyed, by full scale experiments to have at least as good, and sufficient, resistance to impact as concrete ones. This is verified by in-house numerical analyses. A discussion is presented of how well the geometric design of pipeline and protective plate protects the pipeline against some digging scenarios with excavators of different sizes. Since the regulations are differing between countries and comprise a mix of administra-tive and physical protective measures in a way that is not quite evident, it was also found worthwhile to make a note, for possible further use, on how risk analysis can, and has been, used in connection with the establishment of major pipelines for optimization of protective measures.

Place, publisher, year, edition, pages
2012.
Series
SP Rapport, ISSN 0284-5172 ; 2012:67
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-5088Local ID: 14143ISBN: 978-91-87017-83-4 (print)OAI: oai:DiVA.org:ri-5088DiVA: diva2:962727
Available from: 2016-09-07 Created: 2016-09-07Bibliographically approved

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Göteborg (BMg)Rörcentrum
Natural Sciences

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Citation style
  • apa
  • harvard1
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  • vancouver
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Output format
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