Laminar Pte Ltd Singapore

Laminar Pte Ltd

Valves

Flame arrestors

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Description

Adequate risk analysis is based on the identification of flame propagation! 

Flame arresters are passive devices that prevent flame transmission from travelling along a pipe. They consist of narrow passages. During normal operating conditions, a flame arrester allows the flow of gas or steam. It prevents flames from passing due to their small size. 

Several features are inherent in the valve design to ensure smooth, positive, and effective operation. The body is self-draining, and drip rings prevent condensation from settling on seating surfaces. A diaphragm and seal manufactured from Teflon reduce the possibility of ice formation and sticky residues hindering the valve from opening while the pallet assembly moves freely on guide posts.

Flame Arrester Applications:

Businesses install flame arresters in the vents of storage tanks for flammable liquids, piping systems to supply fuel gases to burners, some pipes for delivering flammable gases within the factory, and flare stacks. 

In addition, they are also used in the exhaust device of engines and the crankcase of small engines working in flammable and hazardous environments the presence of flammable.

Detonation and Deflagration Flame Arresters

It is not easy to define the nature of the flame with which a flame arrester can cope. In principle, consider both Deflagration and Detonation or even overdriven detonation.

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QUENCH DEFLAGRATION:

The mechanism of deflagration quench is heat loss. Excessive heat loss can induce flame quenching. Because the passage’s flame velocity is unstable, quenching the deflagration is more complicated.

The passage length, width, and flame velocity primarily determine the quenching characteristics.

QUENCH DETONATION:

The maximum characteristic length of the detonation quench cross section must be less than the size of the detonation cell. When the cross section reaches the limit, it is only possible to destroy the detonation front. 

After the detonation decoupling, deflagration speed decreases, but flame propagation continues. Thus, the passage must be long enough to extinguish the flame completely.

Flame Velocity

3 – 300m/s

300 – 2000m/s

Overpressure Generated

8 – 11 bar

11 – 100 bar

As the flame extinguishing mechanism depends on heat loss, the area-volume ratio of the flame arrester is important. When passing through a series of small holes, the flame divides into several small flames at the front end, effectively dissipating heat from all sides of the laminar flame.

The piping configuration, operating pressure and temperature, oxygen concentration, compatibility of flame arrester material, and explosive gas group should all be considered when selecting a flame arrester. Let LAMINAR assist you in choosing the suitable flame arrester for your specific situation.

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FAQ's

Flame and detonation arrestors are crucial safety devices used in various industries to prevent the propagation of flames and explosions. Both protective equipment and personnel serve the common purpose of safeguarding against potential hazards. However, their operation differs based on the type of combustion they are designed to mitigate.

Flame arrestors are primarily used to stop flames from spreading in piping systems or storage tanks by disrupting the flame front and preventing it from travelling further. They work by cooling the flame temperature below its ignition point, thus extinguishing it. Industries dealing with flammable gases or vapours, like petrochemical plants, refineries, and storage facilities, commonly use flame arrestors.

On the other hand, detonation arrestors are specifically designed to prevent the propagation of shock waves resulting from a deflagration or detonation within a confined space. Unlike flame arrestors, which focus on extinguishing flames, detonation arrestors aim to absorb and dissipate the energy generated by an explosion before it can cause damage downstream. These devices are critical in industries dealing with combustible dust, gases, or vapours, where rapid pressure changes can lead to catastrophic consequences.

In summary, while flame arrestors target flames to prevent their spread, detonation arrestors focus on mitigating shock waves caused by explosions. Both types of arrestors play a vital role in ensuring safety and minimising risks associated with combustible materials in industrial settings.

The primary function of a flame arrester is crucial in preventing the transmission of flame through a pipeline or vessel containing a flammable mixture. In an explosive atmosphere, a flame arrester is essential to mitigate the risk of potential fires or explosions.

They are designed to work across a wide range of industries and applications where flammable gases, vapours, or liquids are present. By incorporating these safety devices into industrial processes, companies can enhance safety protocols and protect against catastrophic events.

In essence, it acts as a barrier that stops the propagation of flames while allowing gases or vapours to pass through freely. Effectively handling this critical component is essential for maintaining safe working environments and preventing accidents in facilities where flammable materials are handled.

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