Verdrängerpumpen

Jousten, Karl; Lachenmann, R.; Jünemann, Alfons; Kossek, Boris; Friedrichsen, Uwe; Lippelt, Erik

doi:10.1007/978-3-8348-2192-8_7

Cited by 1 publication

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Conditions for molecular flow q > 10 À5 Pa m 3 /s, only a single capillary leak is existent [9,14] q > 10 À6 Pa m 3 /s for single leaks [15] q < 10 À7 Pa m 3 /s [9] q < 10 À8 Pa m 3 /s for single leaks [14,15] q < 10 À6 Pa m 3 /s [12] The steady-state gas permeation rate of Helium, expressed in the unit of a leakage rate, is 15…”

Section: Conditions For Laminar Flowmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of Helium Leakage Rates through Closures of Dangerous Goods Packagings for the Assessment of Potentially Explosive Mixtures in Freight Containers

et al. 2015

View full text Add to dashboard Cite

The objective was to find out whether an explosive atmosphere can be created in a freight container by gaseous leakage flow of vapour‐air‐mixture through leaks in the closures of dangerous goods packagings filled with hazardous liquids. Because of high temperatures during intercontinental carriage, there is a gauge pressure in the free vapour phase inside the packagings which can cause a gaseous leakage flow. Two different methods were applied: Helium limit leakage rates for 23 quantitatively important hazardous liquids concerning their lower explosion limit (LEL) were calculated for a worst case transport scenario (Method 1). Helium leakage rates of five closure types of dangerous goods packagings with volumes of approximately 6 l were measured using the pressure technique by accumulation (Method 2). All types of closures of steel packagings were uncritical. The maximum measured leakage was 33% of the limit leakage rate. The leakage rates of screw closures of plastic jerricans can exceed the LEL if there are production‐related patterns such as non‐concentricity of the closures and flashes on the neck. Especially for plastic packagings it is important to minimize gaseous leakage flow, because an explosive atmosphere can also be reached by permeation of the individual filling substance or by a combination of both effects. For the assessment of potentially explosive mixtures in freight containers, both mass transfer mechanisms have to be taken into account. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Section: Conditions For Laminar Flowmentioning

confidence: 99%

“…Mass flow and leakage rate can be converted into each other. 14,15 Applied to the present case, the maximum permissible leakage rate of vapour-air-mixture per individual packaging under conditions of carriage (at average transport temperature T transp ) is…”

Section: Average Temperature During Transportmentioning

confidence: 99%