Detonation flame arrestors is different from deflagration flame arrestors as it is supersonic and propagates through shock. Detonation involves a supersonic. Deflagration and Detonation Flame Arresters. Author(s). Stanley S. Grossel. First published August Print ISBN |Online. An overview of deflagration and detonation prevention and protection practices; An overview of combustion and flame propagation and how DDAs halt.

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As the flame front propagates in the pipe, its speed and associated pressure increase. Designed to stop the propagation of confined low pressure deflagrations.

Flame arrester – deflagration and detonation

Rlame portfolio includes in-line, free vent, deflagration and detonation flame arrestors. An unconfined deflagration results in relatively low flame speeds and virtually no pressure increase.

Flashpoint – The minimum temperature at which a liquid gives off vapor in sufficient concentration to form an ignitable mixture with air near the surface of the liquid. Of course, for further advice or clarification in any way, please get in touch with one of our experts.

Unlike other subcontractors I have experienced on this project, Assentech had a very positive attitude to producing the level of documentation required for a project of this scale. Their specialist on site labour have worked collaboratively with us and Assentech have proven to be open, honest and flexible partners.

Flame arresters and detonation arresters are passive mechanical devices that are mounted to threaded or flanged connections on a tank or in a process piping system.

Added to Your Shopping Cart. Assentech Engineers use a comprehensive test regime. Gaseous detonations normally occur in confined systems but are occasionally observed in large vapour clouds.


We are confident that our technical and scientific knowledge of how a breather vent operates, will ensure that we can assist your site to achieve maximum efficiency and legislative compliance. A deflagration may develop in the atmosphere as an unconfined deflagration, or in an enclosed area, typically a piping system, as a confined deflagration.

They znd be covered by a program of regular inspection and maintenance so they continue to be effective.

When the gas is ignited the flame begins to accelerate. So how can Elmac help? For more specific information on how we use cookies and to change your cookie preferences, see our Cookie Notice.

Detonation involves a supersonic exothermic front accelerating through a medium that eventually drives a shock front propagating directly fame front of it. Wednesday 13th June information.

Flame arrester – deflagration and detonation – Elmac

Such an overdriven detonation is a short lived phenomenon and usually occurs as the flame front is transitioning from a high speed near the speed of sound deflagration to a detonation.

Elmac Technologies, the leading manufacturer of flame arrester technology is providing you with this useful guide to deflagration and detonation pipeline explosions. Deflagration is a term describing subsonic combustion propagating through heat transfer where hot burning material heats the next layer of cold material and ignites it. End-of-Line flame arresters are mounted on outlet flanges and they vent directly to atmosphere.

The portion of a flame arrester or detonation arrester comprised of parallel spaced plates or crimped metal windings. Arrester elements are available in a number of different configurations parallel rectangular metal plate, wound crimped metal, parallel round metal plate. Given enough run up distance, this pressure wave can build into a shock wave as the flame speed reaches sonic velocity. Pressure Relief Valve with Flame Trap. Detonation – Also “Stable Detonation” A flame front propagating through a arrezters gas or vapor ardesters a velocity equal to the setonation of sound in that gas or vapor.


The flame front is extinguished. Caused by ignition of a flammable gas mixture within a pipe. A flame front that propagates at a shock deflagratiion at the speed deflayration sound in the vapor is known as a stable detonation. This flame will burn through the vapor or gas until: Deflagration – A flame front propagating through a flammable gas or vapor at a velocity less than the speed of sound in that gas or vapor.

Bensenville, IL Phone: Installed at the top of an atmospheric vent line or storage tank arresfers prevent flame propagation. One common feature of all flame arresters is that the flammable vapor mixture is forced to pass through a series of small openings as it flows through the arrester.

Here, there is no physical restriction on the associated expansion of volume – the flame front travels below the speed of sound due to the quick dissipation of the heat and pressure into atmosphere. The design and construction of their stainless steel shoe seals continue to prove to operate excellently with no noticeable reduction in performance or flotation ability over the time since Installation.

Lower Explosive Limit – LEL The lowest volumetric concentration expressed as a percentage of flammable vapor in air that is capable of sustaining and transmitting a flame throughout the vapor mixture, at a specified temperature and pressure.