TY - CONF A1 - Sklorz, Christian A1 - Balke, Christian A1 - Otremba, Frank T1 - Fire protection systems for above-ground storage tanks N2 - Liquefied propane gas (LPG) tanks in a fully engulfing accidental fire experience a fast increase in internal pressure. The result is often a Boiling Liquid Expanding Vapor Explosion (BLEVE) that can result in a large fireball and flying debris over a radius of more than 100 meters. In the last 30 years BAM has carried out more than 30 real scale fire tests on propane storage vessels across three test sites. The primary research goal was to identify systems that can delay or prevent a BLEVE. Early studies started with water deluge systems, and have since moved on to consider alternative protection systems. It has been shown that an unprotected vessel fails within 10 minutes or less. Tests with different oil and propane fueled fires have given an overview on possible real accidents involving full-engulfing scenarios. LPG tanks of various sizes (2.7 m³, 3.6 m³, 4.8 m³, 6.7 m³) were used with different filling levels. Numerous protection systems, ranging from active systems like water systems to passive thick- and thin-film layers. Also, the degree of thickness of these layers was variated. Pressure relief valves (PRV) have also been investigated, both alone and in combination with protection systems. This paper gives an overview of the work performed by BAM in the field of BLEVE prevention of protecting system since the last 30 years. It has been shown that e.g. with a full applied coating degree on the tank with and without PRV can be reached an exposition in a test fire scenario a duration of more than 60min. For partly coated tanks with and without PRV the duration time is like an unprotected vessel. Furthermore, it could be shown that the active water system also protects with technically correct design. T2 - Loss Prevention 2019 CY - Delft, Niederlande DA - 16.06.2019 KW - Fire KW - Protection systems KW - Propane storage tanks PY - 2019 SN - 978-88-95608-72-3 VL - 75 SP - 1 EP - 6 AN - OPUS4-49021 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Romero-Navarrete, José A. A1 - Otremba, Frank A1 - Sklorz, Christian A1 - Martínez Madrid, M. T1 - Quasistatic rollover threshold of atmospheric road tankers N2 - Several geometrical analytical tools can be used for assessing the potential benefits of any alternative tank shape. The quasistatic evaluation of the cargo-vehicle behavior represents a fast way to objectively determine the roll stability benefits of any potentially new tank shape. In this paper, the geometrical, quasistatic rollover performance of a convex bottom tank shape is compared with that of standard tank shapes, finding that in spite of the lower position of the cargo´s center of gravity in such a tank shape for the un-perturbed condition, it has the same performance as the elliptical tank shape when subjected to Steady lateral acceleration. That as a result of the large cargo´s lateral displacement. Consequently, the combination of a lower center of gravity for the cargo when it is not perturbed, and a Minimum lateral shift due to lateral accelerations inputs, define the conditions for an ideal tank shape. T2 - CONIIN 2020 CY - Online meeting DA - 28.09.2020 KW - Tank shape KW - Road tankers KW - Center of gravity shifting KW - Quasistatic KW - Convex bottom KW - Geometrical analysis PY - 2020 SP - 1 EP - 6 AN - OPUS4-51388 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Otremba, Frank A1 - Hildebrand, R. A1 - Romero Navarrete, J. A. A1 - Sklorz, Christian ED - Otremba, Frank T1 - A simplified analytical approach on the dynamic pressures in cylindrical vertical tanks N2 - A simplified methodology is proposed to estimate the dynamic pressures developed within partially filled cylindrical vertical tanks when subjected to earthquake-related horizontal accelerations. The total pressure at the bottom of the tank is calculated as the superposition of vertical and horizontal pressures. While the magnitude of the vertical pressure depends on the free surface height of the liquid, the horizontal pressure depends on the magnitude of the horizontal acceleration and on the diameter of the tank. The liquid free surface oscillation angle is simulated based upon the principles of the simple pendulum analogy for sloshing. The length of the pendulum, however, is set on the basis of a methodology to calculate the free sloshing frequency of partially filled containers. Such a methodology is experimentally verified in this work. The outputs of the model for full scale situations, suggest that the lateral perturbation - sloshing phenomenon (earthquake effect) can generate an increase in the total pressure of 56% above the no lateral perturbation situation, further suggesting that such an overpressure should be taken into account when designing tanks that could be potentially subjected to earthquake-related perturbations. KW - Vertical cylindrical tanks KW - Pendulum analogy KW - Experimental approach KW - Sloshing, transition matrix approach KW - Hazmat PY - 2021 SN - 978-981-15-8273-8 SP - 1 EP - 15 PB - Springer AN - OPUS4-51982 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pötzsch, Sina A1 - Krüger, Simone A1 - Sklorz, Christian A1 - Borch, Jörg A1 - Hilse, Thilo A1 - Otremba, Frank T1 - The fire resistance of lightweight composite tanks depending on fire protection systems N2 - To save weight and resources lightweight tanks with complex geometries made of glass-fibre reinforced plastics (GFRP) are a promising innovation for the transportation of dangerous goods. To realise the use of polymer tanks for such applications, their fire safety must be guaranteed. This paper presents solutions to protect fibre-reinforced plastic tanks from fire. The fire resistance of six GFRP tanks with different fire protection systems was tested in an outdoor full-scale fire test facility according to the regulation stipulated in the ADR (European agreement concerning the national carriage of dangerous goods by road). All tanks feature a complex geometry and a holding capacity of 1100 litres. The fire protection systems are composed of specialised resins as well as two intumescent coatings. All systems had a protective impact. The best results were achieved by the epoxy based intumescent coating, which was able to prolong the time needed to reach 150 °C inside the tank by 20 min. The emergence of a temperature holding point inside the tank due to condensation effects was observed at temperatures around 100 °C. KW - Fire safety composite tanks PY - 2018 UR - https://www.sciencedirect.com/science/article/pii/S0379711218301644 U6 - https://doi.org/10.1016/j.firesaf.2018.08.007 SN - 0379-7112 SN - 1873-7226 VL - 100 SP - 118 EP - 127 PB - Elsevier Ltd. AN - OPUS4-45697 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kutz, Philipp A1 - Otremba, Frank A1 - Werner, Jan A1 - Sklorz, Christian T1 - Development of a Single Walled Tank under Cryogenic Conditions made of Composite N2 - The use of glass-fiber reinforced plastic (GRP) can reduce the weight of tanks significantly. By replacing steel with GRP in tanks for gases (propane, etc.) a weight reduction of up to 50 % was reached. In this project not only the material should be optimized, but also the design. Previous tanks consist of a double-walled structure with an insulation layer between the two shells (e.g. vacuum). Goal of this project is to realize a single-walled construction of GRP with an insulation layer on the outside. To determine the temperature dependent material values, two different experiments are performed: In the first experiment, temperature dependent material properties of liquid nitrogen found in literature research are validated in a simple setup. The level of liquid nitrogen in a small jar is measured over the experiment time. Numerical simulation shows the change of nitrogen level with sufficient precision. In the second experiment, a liquid nitrogen is applied on one side of a GRP plate. Temperature is measured with thermocouples on top and bottom of the GRP plate, as well as in the middle of the plate. By use of numerical simulation, temperature dependent thermal conductivity is determined. In the third experiment, a test stand is designed to examine different insulation materials. In this test stand, the insulation material can easily be changed. A numerical simulation, in which the determined material data is used, is performed as well for this test stand. The experiments show, that GRP can be used in cryogenic environments. Multiphase simulations are a suitable tool to describe the energy absorption of thermal energy due to thermal phase change. Results on different insulation materials will follow. T2 - IMECE 2018 CY - Pittsburgh, PA, USA DA - 09.11.2018 KW - Lightweight design KW - Thermal properties of GRP KW - Liquid nitrogen KW - LNG PY - 2018 UR - http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleID=2722335 SN - 978-0-7918-5214-9 U6 - https://doi.org/10.1115/IMECE2018-86365 VL - 9 SP - V009T12A019 PB - ASME AN - OPUS4-47321 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -