The XYXA chemical storage tank breather manhole is a multi‑function safety device installed on the roof of fixed roof tanks, integrating manhole access with breather valve functions, combining personnel entry, overpressure relief, vacuum intake, flame arrestor, and explosion‑proof protection. When the tank pressure exceeds the set value, the pressure disc automatically opens to release excess gas; when vacuum occurs, the vacuum disc opens to admit air or blanketing gas; the built‑in flame arrestor effectively blocks external flame ingress; the manhole cover can be opened for personnel to enter the tank for cleaning or maintenance. Its core purpose is to provide a single safe interface for tanks in chemical, petroleum, storage & transportation, pharmaceutical and other industries that combines safe access, automatic pressure balancing, and fire/explosion protection, especially suitable for applications requiring reduced roof openings and enhanced safety.

XYXA breathing manhole product diagram

Features:

1. Multi‑function integration: Combines manhole cover and breather valve into one unit, reducing roof openings and leakage points, simplifying installation and maintenance.

2. Set‑pressure breathing with automatic regulation: Independent pressure and vacuum discs automatically relieve overpressure and admit air under vacuum; pressure settings adjustable as required.

3. Built‑in flame arrestor: Stainless steel corrugated plate flame arrestor core effectively blocks external flame propagation, meeting petrochemical tank fire and explosion codes.

4. Personnel access function: The manhole cover provides a standard‑size opening (e.g., DN500, DN600) for personnel wearing respirators to enter the tank for maintenance.

5. Large flow capacity with low pressure drop: Optimized flow path ensures low breathing resistance for both venting and gas intake during rapid filling or discharging.

6. All‑weather protection structure: Rain and dust cover with internal drainage prevents water accumulation, suitable for harsh outdoor environments.

7. Corrosion‑resistant materials: Housing and internals available in aluminum alloy, carbon steel, or stainless steel; disc and flame arrestor core in stainless steel for various corrosive media.

8. Reliable sealing and easy maintenance: Flat or tapered hard seal provides zero leakage when closed; removable flame arrestor core for cleaning; simple disc assembly disassembly.