Hinged Emergency Pressure Manhole Cover Vent
ERV SeriesProtectoseal’s ERV Hinged Emergency Pressure Manhole Cover Vent provides emergency pressure relief for storage tanks that are exposed to an external fire. They are designed for installation on the manhole openings of tanks and provide a means of relieving large volumes of vapor, beyond the capacity of a normal operating vent.
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Description
- Efficiently vents directly to the atmosphere
- Pressure settings achieved through weight loading mechanism
- Hinged and counterweight design allows higher pressure settings
- Set points are accurate within +/- 3% across the pressure relief range
- Cover design provides convenient access to the tank
- Flat, smooth diaphragm with PTFE film creates a floating air seal
- Leakage is no more than 1 SCFH at 90% of set pressure
- Lightweight unit for easy handling during inspection and maintenance
- Hinged cover allows easy access into the tank through the seat area
- Conforms to the latest ATEX Directive standards
- Sizes: 8” (DN200) through 24” (DN600)
- Process Connection: API650 (20” & 24”), ANSI 150#
- Materials: Carbon Steel, Stainless Steel
- Diaphragm and Insert: PTFE
- Weight: Lead Plate (standard), Stainless Plate
- Standard Settings: 0.1 psi (7.5 mbar) – 0.2 psi (16 mbar)
- Counter Weight Settings: 0.2 psi (16 mbar) – 0.6 psi (40 mbar)
- Extended Settings: 0.6 psi (40 mbar) – 1 psi (70 mbar)
- Alternative models available with spring-loaded vacuum
- Special materials are available upon request
- Other drill patterns are available upon request
