ZHXRK500/600 type fire-resistant breathing manhole

Main purpose

The fire-resistant breathing manhole is developed by our factory based on market demand and with reference to advanced technical data at home and abroad. It is a safety emergency ventilation device installed on storage tanks for petroleum, chemical and other materials. It is usually used in conjunction with flame retardant breathing valves to avoid accidents caused by sudden overpressure or vacuum inside the tank, which may damage the tank; It can also play a role in safety and fire prevention. It is currently the ideal device for protecting the safety of storage tanks in China, and the product fills the domestic gap.
The product adopts an all-weather sealing structure, which adjusts the opening and closing of the suction valve disc and the relief cover with a matching weight. It uses stainless steel corrugated tape as a flame retardant layer to prevent the passage of flames, and is equipped with double drawer openings, providing convenience for cleaning and replacing the flame retardant layer and shortening the time. In summary, this product has the advantages of constant pressure discharge, constant pressure suction, flexible working and closing, safe fire resistance, compact structure, good sealing performance, and safety and reliability.

Main technical parameters

1. Operating pressure Positive pressure:+1765Pa (180mmH2O) Negative pressure: -392Pa (-40mmH2O)
2. Fire resistance grade: BS 5501: IIA standardization 3. Operating temperature:+60 ℃~-30 ℃
4. Scope of application: Especially suitable for storing materials in dome shaped atmospheric pressure tanks capped with nitrogen gas.

(Fire blocking) breathing manhole

Working principle

Under normal operation of the flame retardant breathing valve, the flame retardant breathing manhole remains sealed and the storage tank is at normal pressure. When the normal operation of the breathing valve cannot meet the sudden overpressure of the storage tank caused by unexpected reasons, the relief cover of the breathing manhole will automatically open for emergency pressure relief to maintain normal pressure inside the tank; When the pressure inside the tank drops sharply or exceeds the vacuum, the suction valve opens to rapidly suck in the atmosphere, maintaining the normal pressure inside the tank; When sparks or flames are inhaled into the atmosphere, the flame barrier acts as a "wall effect" to prevent the flame from passing through and protect the safety of the storage tank.

Main material