How A Detonation Arrestor Works

By Young Lindsay


Hydrocarbons are highly flammable but their levels can be calculated depending on the ratio it has with the air around it. The concept would bring forth control during circumstances where they should be prevented from combusting. This is called deflagration where the the flames are burnt down.

Due to a Clean Air Act from the United States of America, a lot of industries and manufacturers have now pushed through controlling the release of combusted gases and liquids in their factories. There are ways to do his and one invention that stuck out completely is the detonation arrestor. This makes control and managing the materials that are hazardous a lot easier.

Nicholas Roussakis in 1990 was able to invent these Flame Arresters or Arrestors as the initial device. Its mechanism would burn down the ignition that happened in a tank or pipe to prevent it from going further to the source, therefore, preventing it from any huge explosions and damages. Although the detonator is different from a regular flame arrester.

The detonation actually is innovated in order to withstand very high pressure rates up to one thousand five hundred psi or ten MPa. It also can handle supersonic speed that travel through the pipes up to two thousand five hundred meters per second. So basically, this is placed between two pipes or sources in order to make it as a demarcation between the two in case of ignition but still lets the gas flow through.

This is a passive device so there are no moving parts inside it and should be working once it is installed. Inside it is composed of many layers of metallic ribbons that has crimped corrugations. This allows the travel of gas to flow but combustion to stop at certain levels.

There are studies on the limit of these hydrocarbons up until which point of the ratio between them and the air composition for them to burn and stop. This is called their Lower Explosive and Upper Explosive Limits or LEL and UEL. The tests conducted would help determine up to which point to the metal ribbons should be compressed in order to work.

Initially, the LEL starts from the smallest amount of hydrocarbon then increasing it to which point it would start burning, while the UEL is at how much it is until it stops burning. So basically, the ratio is determined with its composition relevant to the air around it. With this information, the arrestor is developed and manufactured accordingly.

With Methane gas as example, its LEL is five percent while the UEL is fifteen percent. This means that when the gas is at five it would burn up until it reaches fifteen percent. Although there are special cases in some hydrocarbons where they still combust even with no oxygen in the air.

The use of this device with its mechanism is highly important in industries where they are dealing with dangerous gases and liquids. These industries call it their vapor control system. This makes sure that the safety of everyone working and the surrounding area would be maintained.




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