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EMERGENCY PRESSURE VENT
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| SERIES | SIZE | BASE FLANGE/SEAT |
HOOD | PALLET | PALLET DIAPHRAGM |
| 7800 | 6"-12" | Alum./Alum. | Aluminum | Aluminum | FEP Film |
| 7800 | 16"-24" | Steel/316 S.S.. | Steel | Aluminum | FEP Film |
| C7800 | 2"-24" | Steel/316 S.S. | Steel | 316 S.S. | FEP Film |
| E7800 | 2"-12" | Alum./Alum. | Aluminum | 316 S.S. | FEP Film |
| F7800 | 2"-24" | 316 S.S./316 S.S. | 316 S.S. | 316 S.S. | FEP Film |
| M7800 | 2"-24" | Hast. C276/Hast. C276 | Hast. C276 | Hast. C276 | FEP Film |
| Flange mating: | 2" - 12" | Aluminum: Mates with 125# FF ANSI Other metals: Mates with 150# RF ANSI |
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| 16" - 24" | Flanged to mate with applicable ANSI 125# FF Flange or API manhole bolting pattern. |
Under normal operating conditions, the vent pallet assembly is closed
providing an effective vapor seal. In the event of an emergency (fire
involvement of the tank), the pallet lifts in response to the increased
pressure in the tank's vapor space. Vapor is expelled, thereby protecting
the tank from dangerous over-pressurization. Pallet assembly automatically
closes and reseals when the pressure is reduced.