When would you use a detonation arrestor?
When would you use a detonation arrestor?
This arrester is suitable for stopping a confined deflagration that has propagated through a pipe for some specified maximum distance. If any flammable mixture of vapor or gas comes in contact with an ignition source, a flame front will develop.
What is the difference between a flame arrestor and a detonation arrestor?
In short, the deflagration Flame Arrester is designed to stop the initial phase of the explosion and is shorter and lighter than the unstable detonation arrestor, but the Deflagration Flame Arrester has restrictions on its placement within the pipework regarding distance from the source of ignition.
Where are flame arrestor required?
End-of-line (EOL) flame arresters are fitted to the end of a pipeline or exit to a vessel to prevent atmospheric deflagrations (flames) from entering, and not, as is often believed, to prevent the flame exiting the vessel or pipeline.
How do flame arrestors work?
A flame arrester functions by absorbing the heat from a flame front traveling at subsonic velocities, thus dropping the burning gas/air mixture below its auto-ignition temperature; consequently, the flame cannot survive. The heat is absorbed through channels (passages) designed into an element.
What is a deflagration explosive?
Deflagrating explosives burn faster and more violently than ordinary combustible materials. The burning of a deflagrating explosive is therefore a surface phenomenon which is similar to other combustible materials, except that explosive materials do not need a supply of oxygen to sustain the burning.
What is a flame arrestor on a boat?
Because boat engines may backfire, all powerboats (except outboards) that are fueled with gasoline must have an approved backfire flame arrestor on each carburetor. Backfire flame arrestors are designed to prevent the ignition of gasoline vapors in case the engine backfires.
What is a gas can flame arrestor?
Paul, a flame arrestor is a small device, similar to a mesh screen, in the nozzle of the can. The screen helps prevent vapors in the gasoline container from igniting. Such a device is required on metal gas cans such as those frequently seen on job sites, but there is no similar requirement for plastic gasoline cans.
What are flame arrestors made of?
The arrestor is generally made of wound crimped metal ribbon. The metal absorbs the heat from the flame passing through it. This reduces the temperature of the flame to below its autoignition temperature at which point the flame goes out.
Is a flame arrestor a valve?
The Valve reduces emissions and product loss, while the flame arrester protects the tank from flames in the atmosphere during venting of flammable gases.
What is difference between detonation and deflagration?
Deflagrations and detonations A deflagration occurs when a flame front propagates by transferring heat and mass to the unburned air–vapor mixture ahead of the front. A detonation occurs when the flame velocity reaches supersonic speeds above 600 m/s and generally in the 2000–2500 m/s range.
What should I know about exploding bridge wire detonators?
An introduction to exploding bridge-wire (EBW) detonators is given followed by an extensive critical review of open source literature pertaining to these devices. The aim is to better establish the mechanism of operation.
How big is a Risi bridge wire detonator?
For example, the commercial Teledyne RISI RP-80 detonator has a 40 mil (1.02 mm) long, 1.5 mil (38 μ m) diameter gold bridge-wire welded to the electrical terminals. Prompt detonation would require a function time of 1.49 μ s.
What are the parts of an exploding bridgewire?
An EBW has two main parts: a piece of fine wire which contacts the explosive, and a “strong” source of high-voltage electricity — strong, in that it holds up under sudden heavy load. When the wire is connected across this voltage, the resulting high current melts and then vaporizes the wire in a few microseconds.
Can a Reticulated metal foam be used as a detonator?
A reticulated metal foam has been evaluated as a medium for quenching detonations in high pressure acetylene and low pressure oxy-acetylene lines. The material has successfully quenched detonations in static acetylene at initial pressures up to 2.6 MN/m^a and static oxy-acetylene at initial pressures up to 450 KN/m^a in 12.7 mm bore pipe.
https://www.youtube.com/watch?v=6pBBhtb8Ma0