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CNG vehicle containers exposed to local fires
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0001-8548-657x
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0001-6758-6067
2019 (English)Report (Other academic)
Abstract [en]

Fuels with a high energy density have contributed to the development of modern communities. On the other hand, fuels contain energy that, during some conditions, can result in incidents, not least within transportation. CNG vehicles are designed according to safety standards of UNECE, including events such as fire. In case of a fire a thermally activated Pressure Relief Device (TPRD) should empty the container before a pressure vessel explosion potentially can occur. CNG tanks are according to UNECE regulation 110 tested against a 1.65 m long pan fire. However, local fires are not included in these tests. This report presents fire tests of CNG containers performed both with a UNECE compatible fire source and with a local fire source. Any pressure vessel explosion and jet flames were characterized for two different types of CNG containers, namely steel and composite. In five out of six tests the safety of the CNG containers prevailed also in the event of a local (0.24 m by 0.24 m) pan fire, meaning that no pressure vessel explosion occurred. In real vehicle fires, where the fire extends from its local characteristics to a more developed fire that expose the CNG containers to a larger extent, these tests support that TPRDs most likely will activate. The experience from running these test series call for that the fire source should be more accurately defined with regards to fuel and dimensions and a local fire should be included in the UNECE Regulation 110.

Place, publisher, year, edition, pages
2019. , p. 67
Series
RISE Rapport ; 2019:120
Keywords [en]
Fire tests, CNG, containers, vehicle, pressure vessel explosion, jet fire
Keywords [sv]
Fordonsgastank, biogas, metangas, smältsäkring, tryckkärlsexplosion, jetbrand
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42143ISBN: 978-91-89049-73-4 (electronic)OAI: oai:DiVA.org:ri-42143DiVA, id: diva2:1379043
Note

Finansierat av RISE Tunnel Underground Safety Center (TUSC).  This is an updated version of RISE Rapport 2019:120. The revised version (2019:120_rev1) includes clarifications and some editorial corrections. The data and analysis are the same as in the first publication

Available from: 2019-12-16 Created: 2019-12-16 Last updated: 2020-01-15Bibliographically approved

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Gehandler, JonatanLönnermark, Anders

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