Product Catalog
Deflagration Flame Arrestor
The deflagration-proof flame arrestor is a safety device installed on flammable gas/vapor pipelines or equipment nozzles. It allows normal gas flow while stopping the propagation of backfire from subsonic deflagration flames (
- Parameters
- Drawing
- Application areas
Working Principle
Slit Quenching:When flame enters narrow channels formed by corrugated plates, wire mesh or porous metal (gap smaller than the MESG of the medium), heat is rapidly dissipated, thus extinguishing the flame.
Deflagration Resistance:Blocks subsonic deflagration; not suitable for detonation resistance.
Burn Resistance:Withstands short-duration burning to prevent the flame arrester element from being damaged by sustained combustion.
Structural Composition
Shell:Carbon steel / 304 / 316L stainless steel, flange connection (GB, HG, ANSI, DIN, GOST standards)
Flame Arrestor Element (Core Component):304 or 316L corrugated plates, multi-layer wire mesh or porous metal; gaps designed according to the MESG of the medium.
Sealing Components:PTFE / fluoroelastomer (FKM) / metal graphite gaskets
Qualifications & Certifications
Type Certification for IIA Deflagration Resistance，Type Certification for IIB Deflagration Resistance，ATEX Type Certification
Applicable Standards
GB 5908-2024
ISO 16852、SH/T 3413-2019
EN ISO 16852-2016、EN 1127-1-2019
Parameter
| Parameter | Standard Version | Premium Version | Remarks |
|---|---|---|---|
| Nominal Diamete | DN25 ~ DN1200 | Customizable | Matches pipeline nominal diameter |
| Pressure Class | PN10/16/25/40 | PN16 ~ PN40 | High pressure ≥6.4MPa available by customization |
| Design Temperature | -40℃ ~ 400℃ | -60℃ ~ 450℃ | 316L / Duplex steel for high-temperature service |
| Flame Arrest Grade | Deflagration-resistant (Group IIA/IIB) | Dual grade IIA & IIB | Group IIC requires detonation-resistant type |
| MESG Clearance | ⅡA＜0.9mm；ⅡB＜0.5mm | ⅡA≤0.8mm；ⅡB≤0.45mm | Safety margin: 0.8–0.9 times |
| Deflagration Resistance Test | Passes 6 consecutive deflagration tests | 6 deflagration tests + 1-hour burn resistance | GB 5908-2024 |
| Pressure Drop | ≤5kPa（DN100，10m/s） | ≤3kPa | Lower value represents better performance |
| Burn Resistance Duration | End fitting: 1h; In-line: ≤10min | End fitting: 1.5h | Test medium: Propane 4%±0.4% volume concentration |
| Explosion-proof Mark/td> | Exd ⅡBT4 | Exd ⅡBT6 | Suitable for chemical hazardous explosion zones |
