Closed piping or manifold tank systems normally include sizable lengths of vent piping. The bend, and elbows and other changed of section. These systems require detonation arrestors to mitigate the danger of flames transitioning to a high speed deflagration and detonation on board vessels.
The JS 2370 and VOR-2385 Detonation Arrestor
In-line detonation arrester type JS 2370 and VOR-2385, which is also suitable for end-of-line installation, is designed to prevent flame fronts in pipe lines from passing through but allows non-burning gases to continue. Due to its compact size and low weight it is ideal for marine gas return systems.
Type JS is fully approved for AND, EU-MED and IMO vessels.
Specifications and testing
Designing, testing and using of detonation arresters is a complex matter involving consideration for pipe configuration, location, operational conditions, physical properties of gases and vapors and pressure drop limitations.
Type JS will restrain fire from passing in case of deflagration and detonation and can be installed anywhere in the piping. It features easily removable flame traps and can be maintained by a single service engineer without need for special tools, lifting crane etc. Certain limitations in application must be observed and thorough consulting is advised.
As illustrated in figure 14, this type of detonation flame arrester offers prevention of flashback in case of explosion and detonation on one side and prevention of explosion on the other. Therefore, the possible source of ignition always has to be located on the side with the detonation shock absorber.
The turnover point from deflagration to detonation is reached when the unburned gases are compressed to autoignition temperature and consequently burn as a detonation, even though it has not been in contact with the flame front. At this point a peak velocity of more than 4,500 m/sec. and short time static pressure of more than 100 bar can be reached, steadying at a constant velocity of approximately 1,850 m/sec. and 35 bar.
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