OPENINGS & VENTING
Typical Openings in Aboveground Tanks
Standard Threaded Tank Flange
- The most standard opening on aboveground tanks
- Available in 1" to 8" female NPT
- Welded to tank per UL® 142
Pipe Coupling
- Optional threaded opening
- Half or full couplings available
Bolt Flanges
- 150 lb. standard, other sizes available on request
- Available in 1" to 12"
Manholes
- 20" standard, other sizes available on request
- Spring loaded for use as emergency vent or standard bolted for access to tank interior
Typical Air Vents and Emergency Vents in Aboveground Tanks
Screened Air Vent, Tee Type
- Screened with No.40 mesh brass wire cloth
- Available in sizes 1" - 3"
Screened Air Vent, Mushroom Type
- Screened with No.40 mesh brass wire cloth
- Available in sizes 1" - 3"
Emergency Vent, Female Threaded
- Operates when pressure forces the weighted cover up off the seat, allowing excess air to exhaust.
- Available in sizes 4" - 8"
Emergency Vent, Flange Mounted
- Operates when pressure forces the weighted cover up off the seat, allowing excess air to exhaust.
- Available in 8" and 10", with flanged adaptor