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Review of stable gas and its safety applications
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
2018 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This thesis has been performed at Autoliv Sverige AB in Vårgårda. The purpose of the thesis was to increase Autoliv’s knowledge regarding stable gas and its safety applications. To achieve this, a literature study, eight interviews and patent searches has been performed. To broader the understanding further, a concept study of an inflatable life buoy has been made. This idea was presented during a brainstorming session with nine employees at Autoliv. There are some certain characteristics that differentiates gas from solid and liquid substances. The first characteristic is that gases does not have a specific shape or volume. The volume is determined by the size of the container. Another property of gas is that it could be compressed to decrease its volume. The last characteristic is that a contained gas obtain pressure against all walls in the container. If the temperature increases, the pressure will increase as well. In this thesis, stable gas is defined as gases that not react with other gases when it is let out in the air. An unreactive gas means that the valence shell is full and that no electrons are missing or needs to be bound to another molecule. This corresponds to stable gases, for example the noble gases that is presented to the far right in the periodic table of elements. There are several safety products on today’s market that uses stable gas. This thesis includes a screening of three variants of inflatable vests, a bicycle helmet and a lifeboat. These products activate in different ways, both automatically and manually. The purpose of the life buoy was to do design a product that is easier to throw and takes less space than a traditional life buoy. Thus, demonstrate how stable gas can be applied in a real-world scenario. A complete solution has not been developed in this thesis due to the limiting time factor. Basic constraints, such as pressure and volume were calculated to show the necessary requirements on the buoy and the cylinder. The concept study of the inflatable life buoy resulted in a buoy of 35 litres with a cross section diameter of 1.6 dm. To be able to inflate this volume, a cylinder containing 90 ml is required. The dimensions of the cylinder have been calculated to minimize the use of material which resulted in a height and diameter of 50 mm. One of the conclusion of this thesis is that stable gas is useable for safety applications. The choice of gas depends on the specific product and its conditions and requirements. Therefore, a specific gas cannot be considered as the most optimal.

Place, publisher, year, edition, pages
2018. , p. 46
Keywords [en]
Stable gas, safety
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:hv:diva-12552Local ID: EXM502OAI: oai:DiVA.org:hv-12552DiVA, id: diva2:1227084
Subject / course
Mechanical engineering
Educational program
Maskiningenjör
Supervisors
Examiners
Available from: 2018-06-29 Created: 2018-06-27 Last updated: 2018-06-29Bibliographically approved

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