For the case where a dust or gas explosion can occur in a connected
process vessel, it would be useful, for the purpose of designing
protection measures and also for assessing the existing protection
measures such as the correct placement, to have a tool to estimate
the time for flame front propagation along the connecting pipe. Measurements
of data from large-scale explosion tests in industrially relevant
process vessels are reported. To determine the flame front propagation
time, either a 1 m3 or a 4.25 m3 primary process vessel was connected
via a pipe to a mechanically or pneumatically fed 9.4 m3 secondary
silo. The explosion propagation started after ignition of a maize
starch/air mixture in the primary vessel. No additional dust was
present along the connecting pipe. Systematic investigations of the
explosion data have shown a relationship between the flame front
propagating time and the reduced explosion over-pressure of the primary
explosion vessel for both vessel volumes. Furthermore, it was possible
to validate this theory by using explosion data from previous investigations.
Using the data, a flame front propagation time prediction model was
developed which is applicable for: - gas and dust explosions up to
a K value of 100 and 200 bar m s-1, respectively, and a maximum reduced
explosion over-pressure of up to 7 bar; - explosion vessel volumes
of 0.5, 1, 4.25 and 9.4 m3, independent of whether they are closed
or vented; - connecting pipes of pneumatic systems with diameters
of 100-200 mm and an air velocity up to 30 m s-1; - open ended pipes
and pipes of interconnected vessels with a diameter equal to or greater
than 100 mm; - lengths of connecting pipe of at least 2.5-7 m.
%0 Journal Article
%1 Roser:1999
%A Roser, Markus
%A Vogl, Albrecht
%A Radandt, Siegfried
%A Malalasekera, Weeratunge
%A Parkin, Rob
%D 1999
%J Journal of Loss Prevention in the Process Industries
%K Dust Explosion Flame Interconnected K Pressure Reduced and disengagement, explosion explosions, front gas interruption, over-pressure, propagation, value venting, vessels,
%N 5
%P 421--436
%R http://dx.doi.org/10.1016/S0950-4230(99)00013-3
%T Investigations of flame front propagation between interconnected
process vessels. Development of a new flame front propagation time
prediction model
%U http://www.sciencedirect.com/science/article/B6TGH-3WYJ48S-7/2/02ce345bdd2766d3112e87f651d571b6
%V 12
%X For the case where a dust or gas explosion can occur in a connected
process vessel, it would be useful, for the purpose of designing
protection measures and also for assessing the existing protection
measures such as the correct placement, to have a tool to estimate
the time for flame front propagation along the connecting pipe. Measurements
of data from large-scale explosion tests in industrially relevant
process vessels are reported. To determine the flame front propagation
time, either a 1 m3 or a 4.25 m3 primary process vessel was connected
via a pipe to a mechanically or pneumatically fed 9.4 m3 secondary
silo. The explosion propagation started after ignition of a maize
starch/air mixture in the primary vessel. No additional dust was
present along the connecting pipe. Systematic investigations of the
explosion data have shown a relationship between the flame front
propagating time and the reduced explosion over-pressure of the primary
explosion vessel for both vessel volumes. Furthermore, it was possible
to validate this theory by using explosion data from previous investigations.
Using the data, a flame front propagation time prediction model was
developed which is applicable for: - gas and dust explosions up to
a K value of 100 and 200 bar m s-1, respectively, and a maximum reduced
explosion over-pressure of up to 7 bar; - explosion vessel volumes
of 0.5, 1, 4.25 and 9.4 m3, independent of whether they are closed
or vented; - connecting pipes of pneumatic systems with diameters
of 100-200 mm and an air velocity up to 30 m s-1; - open ended pipes
and pipes of interconnected vessels with a diameter equal to or greater
than 100 mm; - lengths of connecting pipe of at least 2.5-7 m.
@article{Roser:1999,
abstract = {For the case where a dust or gas explosion can occur in a connected
process vessel, it would be useful, for the purpose of designing
protection measures and also for assessing the existing protection
measures such as the correct placement, to have a tool to estimate
the time for flame front propagation along the connecting pipe. Measurements
of data from large-scale explosion tests in industrially relevant
process vessels are reported. To determine the flame front propagation
time, either a 1 m3 or a 4.25 m3 primary process vessel was connected
via a pipe to a mechanically or pneumatically fed 9.4 m3 secondary
silo. The explosion propagation started after ignition of a maize
starch/air mixture in the primary vessel. No additional dust was
present along the connecting pipe. Systematic investigations of the
explosion data have shown a relationship between the flame front
propagating time and the reduced explosion over-pressure of the primary
explosion vessel for both vessel volumes. Furthermore, it was possible
to validate this theory by using explosion data from previous investigations.
Using the data, a flame front propagation time prediction model was
developed which is applicable for: - gas and dust explosions up to
a K value of 100 and 200 bar m s-1, respectively, and a maximum reduced
explosion over-pressure of up to 7 bar; - explosion vessel volumes
of 0.5, 1, 4.25 and 9.4 m3, independent of whether they are closed
or vented; - connecting pipes of pneumatic systems with diameters
of 100-200 mm and an air velocity up to 30 m s-1; - open ended pipes
and pipes of interconnected vessels with a diameter equal to or greater
than 100 mm; - lengths of connecting pipe of at least 2.5-7 m.},
added-at = {2010-01-05T23:12:10.000+0100},
author = {Roser, Markus and Vogl, Albrecht and Radandt, Siegfried and Malalasekera, Weeratunge and Parkin, Rob},
biburl = {https://www.bibsonomy.org/bibtex/28a0b4b55ad78282bd16e11fa739abf2f/sjp},
doi = {http://dx.doi.org/10.1016/S0950-4230(99)00013-3},
file = {sdarticle.pdf:http\://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TGH-3WYJ48S-7-21&_cdi=5255&_user=612300&_orig=search&_coverDate=09%2F30%2F1999&_sk=999879994&view=c&wchp=dGLbVtb-zSkWW&md5=48a452794bb45d7197d6c829ce47a296&ie=/sdarticle.pdf:PDF},
interhash = {a556aed05e62700248332b43cf76f400},
intrahash = {8a0b4b55ad78282bd16e11fa739abf2f},
journal = {Journal of Loss Prevention in the Process Industries},
keywords = {Dust Explosion Flame Interconnected K Pressure Reduced and disengagement, explosion explosions, front gas interruption, over-pressure, propagation, value venting, vessels,},
month = {September},
number = 5,
pages = {421--436},
timestamp = {2010-01-19T17:39:44.000+0100},
title = {Investigations of flame front propagation between interconnected
process vessels. Development of a new flame front propagation time
prediction model},
url = {http://www.sciencedirect.com/science/article/B6TGH-3WYJ48S-7/2/02ce345bdd2766d3112e87f651d571b6},
volume = 12,
year = 1999
}