Flash Back Arrestors

Flash Back Arrestors: Critical Protection Against Flame Travel 

Flashback arrestors are critical safety devices used in gas welding and cutting to prevent reverse burning and explosion hazards. They contain stainless steel mesh discs that stop the backflow of any accidental flame into the fuel gas supply line or cylinder.

Flashback arrestors are installed in the hose line connecting the regulator to the torch. During normal gas flow, they allow unrestricted passage. But in case of a flashback, the flame speed increase causes it to extinguish at the arrestor mesh gaps due to lack of oxygen.

This fail-safe mechanism isolates the flame before it reaches the fuel source, preventing catastrophic fire accidents and saving lives. Flashback arrestors are mandatory protection equipment for industries handling fuels like acetylene, LPG, and CNG.

How Do Flashback Arrestors Function?

Flashback arrestors contain a series of stainless steel mesh discs with precise spacing between them. During normal gas flow, the gas passes through the discs freely.

But in case of a flashback, the flames speed up and cannot penetrate the small mesh gaps due to lack of oxygen. This instantly blocks the flame travel to stop the fire from reaching the fuel container.

The discs also absorb heat, further extinguishing the flame. This fail-safe protection prevents catastrophic damage to equipment and personnel.

Knowing The Types of Flashback Arrestors

End-of-Line Flashback Arrestors

• Installed at the torch end of the hose
• Protects gas cylinder if torch end catches fire
• Stops reverse flame travel from torch to cylinder

In-Line Flashback Arrestors

• Positioned between regulator and hose
• Provides added protection
• Useful for long hoses where the end unit is insufficient

Bi-Directional Flashback Arrestors

• Contains arresting material on both inlet and outlet
• Stops flashback from either direction
• Provides all-round protection

Vital Factors to Consider When Selecting a Flashback Arrestor

• Gas Type and Pressure: Ensure the flash arrestors suit the specific fuel gas and pressure used. Acetylene arrestors differ from LPG, CNG, or LNG types.
   
• Arrestor Size: Size impacts the flow rate. Select the adequate diameter for smooth gas flow to the torch. Avoid flow restrictions.
   
• Single vs. Dual Cylinder Use: For dual-cylinder setups, use twin flashback arrestors for simultaneous protection on both fuel line paths.
   
• Hose Length and Diameter: Account for the hose length and inner diameter while picking arrestor flow ratings.
   
• Regulator Flow: Choose an arrestor flow rating higher than the regulator’s max. flow capacity for unrestricted gas flow.
   
• Standards Compliance: Opt for back fire arrestor compliant with EN 730 and other safety standards for quality assurance and reliability.
   
• Installation Position: Install according to manufacturer guidance. End-of-line arrestors at inlet or outlet? In-line positioning?

Trustworthy Flashback Arrestor Brands

Messer Cutting Systems

• German welding and cutting leader serving industries worldwide since 1898.
• Offer a wide range of end-of-line and in-line LPG/Acetylene flashback arrestors. 
• Designed to CE standards for up to 1" hoses in light to heavy industrial uses.

Seema Engineering Industries

• The premier manufacturer of welding accessories from Kolkata since 1979.
• The varied range includes flashback arrestors for DA and LPG in both in-line and end-of-line configurations.
• Reliable protection for flow rates up to 2500 lit/hour, compliant with IS:2871.

Ador Welding Limited

• Leading Indian welding company headquartered in Mumbai, in business since 1951. 
• Trusted flashback arrestors range developed specifically for DA and LPG gases used in welding.
• Offered in hex check and internal disk type models to safeguard torch equipment. 

Buying flash back arrestor for LPG cylinder on Moglix

Whether using DA, acetylene, or LPG/CNG in welding, Moglix makes it easy to equip hoses with certified flashback protection. Discover fire back arrestors on Moglix from specialist welding brands like Messer and Ador Welding, matching your flow needs. Investing in the right flashback arrestor prevents accidents and delivers long-term safety.

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