Understanding Flame Arrestors: Construction and Function

A flame arrestor is a mechanical device designed to prevent the spread of flames in a potentially explosive atmosphere. These devices are often used in industrial environments, such as oil refineries and chemical plants, where there is a risk of flammable gases or vapors coming into contact with an ignition source. In this blog post, we will discuss the typical structure of a flame arrestor and how it works.

Construction of a Flame Arrestor

The construction of a flame arrestor is relatively simple, yet very effective. It consists of a mesh or perforated metal or ceramic plate surrounded by a cylindrical housing. The mesh or perforated metal plate is designed to slow and disrupt the flow of flames and hot gases, preventing them from passing through the device.

How a Flame Arrestor Works

When a flame or ignition source comes into contact with a flammable gas or vapor, a flame front is created that spreads or travels through the mixture. When the flame front reaches the flame arrestor, it is forced to pass through the mesh or perforated metal plate. Small holes in the sheet metal create a winding path for the flame to travel along, which causes heat and momentum to be lost. This disruption causes the flame to smother and not spread further.

In addition, the cylindrical casing surrounding the mesh or perforated sheet is designed to prevent flames from penetrating the device. The casing is usually made of metal and is strong enough to withstand the pressure and high temperatures of the flame.

Types of Flame Arrestors

• Deflagration arrestors are designed to stop the spread of flames.
• Detonation arrestors are used to prevent the spread of detonation waves, which are more severe and destructive than flames.

In short, a flame arrestor is an essential safety device used in industries where there is a risk of fire or explosion. The typical structure consists of a mesh or perforated sheet metal, enclosed in a cylindrical casing. The casing disrupts and slows the flow of flames and hot gases. This prevents flames from spreading and protects workers and equipment from the hazards of a possible explosion.

 

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