The Protego BE/AD is a compact end-of-line flame arrester designed to prevent atmospheric deflagrations from traveling back into non-pressurized vent lines of vessels or plant equipment. It’s ideal for short-duration vapor release situations and features a protective weather hood and modular flame filter unit.
Weather-protected, modular design
Threaded FLAMEFILTER® quick access
Covers Explosion Groups IIA–IIC
Not specified publicly — typically omission for atmospheric vent devices
Not specified; omit or confirm via internal datasheet
Up to +60 °C / 140 °F (standard); higher temps available upon request
Pipe thread per DIN ISO 228-1; other threads on request
DN Size (mm / inch)
a (mm / inch)
b (mm / inch)
15 / ½″
116 / 4.57″
80 / 3.15″
20 / ¾″
116 / 4.57″
80 / 3.15″
25 / 1″
116 / 4.57″
85 / 3.35″
32 / 1¼″
116 / 4.57″
85 / 3.35″
40 / 1½″
200 / 7.87″
150 / 5.91″
50 / 2″
200 / 7.87″
150 / 5.91″
15 (½″), 20 (¾″), 25 (1″), 32 (1¼″), 40 (1½″), 50 (2″)
Housing: Steel, Stainless Steel, Hastelloy (special) Weather Hood: Stainless Steel (or Hastelloy option) FLAMEFILTER®: Stainless Steel, Hastelloy (special)
IIA to IIC (NEC Groups D to B)
ATEX compliant, meets EN ISO 16852; other approvals on request
Used on vent lines of small, non-pressurized vessels across industries like petrochemical, chemical, and pharmaceutical. Best for systems that discharge vapor briefly and need protection against atmospheric flame propagation.
Designed for short-duration discharge of vapours in explosion groups IIA–IIC. Not for endurance burning applications.
Shields non-pressurized systems from atmospheric deflagration
Modular FLAMEFILTER® enables rapid maintenance
Weather-resistant design prevents clogging and damage
Efficient and cost-effective spare parts and lifecycle maintenance
Flexible for varied explosion groups and certified per ATEX/EN ISO standards
Special material options: Hastelloy
Higher operating temperature designs (on request)
Alternate threading or custom connection types
Additional certifications (national/international) as required
From forging and casting to machining, assembly, and testing — every step is managed under one roof to ensure consistent quality, faster lead times, and zero compromise.
Get in touch with our team for additional information on product pricing, technical data, project support and more.
