Tank Breathers and Vents
Desiccant breathers, updraft vents, and pressure-vacuum relief vents — DN20 to DN50
Desiccant breathers, updraft vents, and pressure-vacuum relief vents for above-ground fuel storage tanks. Donaldson TRAP desiccant breathers remove moisture and particulate from tank headspace air - protecting stored fuel from water ingress and contamination.
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Common Questions
Why do fuel tanks need breathers?
As fuel is pumped out of a tank, air must enter to equalise pressure — otherwise the tank can collapse under vacuum. A breather allows air in while filtering out moisture and particulate contamination. Without a breather, condensation forms inside the tank, promoting microbial growth (diesel bug) and corrosion.
How often should desiccant breathers be replaced?
When the colour-change indicator shows the desiccant is saturated. In humid environments this may be every 3–6 months. In dry conditions, a breather can last 12+ months. Always stock a spare breather for each tank.
What's the difference between a breather and a pressure-vacuum vent?
A breather allows free air flow in and out of the tank while filtering moisture and particulate. A pressure-vacuum (PV) vent only opens at set pressure thresholds — it controls vapour emissions and prevents tank deformation under extreme temperature changes. Larger tanks typically use both.
Need breathers for your tank installation?
Tell us your tank type, thread size, and whether it's stationary or mobile — we'll recommend the right breather.