Emergency Vent & Manhole Cover Model 94065

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The FRP 94065 Series Manhole Cover is designed to provide emergency venting and vacuum relief of low-pressure storage tanks and vessels. These covers also provide quick, easy access for tank inspection and maintenance. When the tank is exposed to abnormal internal pressure or vacuum beyond the capability of the breather vent, the manhole protects the tank against costly rupture or implosion.

Technical Data

Sesco SKU:tp-036 Category: Brand:

Available on backorder


The FRP 94065 Series Manhole Cover provides an effective vapor-tight seal until pressure or vacuum relief is required to protect the tank. Under emergency fire conditions, the cover opens fully to allow escape of vapors and prevents damage to the tank. Under vacuum conditions, the spring-loaded vacuum vent will open to relieve excessive negative pressure.

Flange, Seat, and Pallets of Derakane 470 Vinyl Ester Resin. Hastelloy Spring, 316SS Hardware and Teflon Air
Cushioned Pallet Seating ®
Other resins are available to meet exact corrosion requirements, including 411 Derakane and Furan. Hastelloy and Monel hardware available.

The rugged and lightweight design provides for easy, convenient handling for installation, inspection and maintenance. The pressure cover is normally restrained to allow automatic reseating and to protect the vacuum vent mechanism. Disconnection of the retaining cords allows the pressure vent cover to be completely removed, thereby allowing access into the tank through the full diameter seat opening. Facilitates tank inspection and repair procedures. Standard pressure setting of 3.3 mbar on all models. Standard vacuum relief setting is 2.2 mbar. Higher settings are also available.


Features & Benefits
• 16″, 20″, 24″ Sizes
• Acids & Caustic Services
• Fiberglass Construction
• API 650, ANSI 150 or DIN Flange Drilling
• Easy Maintenance
• Fast Inspection
• Maintains accurate pressure setting
• Leakage Rate of < 100 m3/h at 90% of Set Point
• 470 Derakane Std., 411 Derakane and Furan Available


Emergency Vent and Manhole Cover Setting Range

  • Model numbers: Model 94065
  • Sizes Available: 16”, 20” and 24”
  • Connections: API 650, ANSI 150, DIN
  • Pressure & Vacuum: Pressure – 3.2 mbar or higher, Vacuum – 2.2 mbar or higher