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 the working principle of lightning arrester?
Lightning arrestor working principle is, once the voltage surge travels throughout the conductor then it reaches the location of the arrestor where it is installed. So it will break down the insulation of the lightning arrestor for a moment, so voltage surge can be discharged toward the ground.
How does a flame screen prevent fire?
A portable or fitted device incorporating one or more corrosion resistant wire woven fabrics of very small mesh which is used for preventing sparks from entering a tank or vent opening or, for a short time, preventing the passage of flame.
Why are flame arrestors needed?
Flame arresters are installed on such equipment to prevent potential hazards associated with flammable and explosive materials. A flame arrester works by forcing a flame front through very narrow channels. Gas travels through the device, but the passages are so narrow that the flame can no longer be maintained.
Where are flame arrestors required?
Flame arresters are typically used wherever there is the potential for an explosion arising from flammable gas or vapour being mixed with air. Accidental ignition of a flammable mixture will result in a flame that will travel through the unburnt mixture until the fuel is consumed by the reaction.
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 surge arrester and lighting arrestor?
Surge Arrester: is a device used to protect the electrical installations and equipment from electrical surges and transient voltage caused by electrical faults, switching, short circuits, sparks and lightning etc. Lightning arresters are installed outside to ground the harmful effects of lightning spikes.
What is horn gap arrester and its working?
Horn Gap Arrester It consists of two horns shaded piece of metal separated by a small air gap and connected in shunt between each conductor and earth. The distance between the two electrodes is such that the normal voltage between the line and earth is insufficient to jump the gap.
When should a flame arrestor be installed?
1. Every point of discharge of methane from a pipeline into the atmosphere or into a compressor or pump should be fitted with a flame arrestor. 2. Each device should be securely anchored in an accurate seating so that it cannot be displaced by an explosion and so that flame cannot propagate past the seating.
Where are flame arrestors used normally?
Flame arrestor technology is widely used across the process industries: … including refining, pharmaceutical, chemical, petrochemical, pulp and paper, oil exploration and production, sewage treatment, landfills, mining, power generation, and bulk liquids transportation.
What is the working principle of flame arrestor?
Flame Arrestors Working Principle. Flame arrestors operate on the principle of removing heat from the flame as it attempts to travel through narrow passages with walls of metal or other heat-conductive material. Flame arrestors are passive mechanical devices that are mounted to a tank or in a process piping system.
What is a flame arrester used for?
A flame arrester, as the name suggests, is a device used to stop a flame from entering into an atmosphere where combustible gases may be present and prevent explosions. Gas-based equipment and appliances such as glycol dehydrators and indirect line heaters often use flame arresters.
How does a deflagration arrester work?
A flame arrester (also called a deflagration arrester) functions by absorbing the heat from a flame front traveling at sub-sonic 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 an in-line flame arrestor?
In-Line Flame Arrestor In-line flame arrestors are fitted in piping systems to protect downstream equipment. The layout shown below is typical although it is also possible that the source of ignition could cause the flame to travel with the gas flow. If the flame could come from either direction then a bi-directional flame arrestor is required.