Images are representations only.

Series 51700 Hinged Emergency Pressure Manhole Cover Vent

Brand: Protectoseal Company
Protectoseal Series 51700 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. 

The Series 51700 design allows for higher pressure relief settings than are available on our Series 53300 Emergency Pressure Manhole Cover Vent. 

Series 51700 Manhole Cover Vents do not provide vacuum relief. 

Vacuum relief must be supplied by the operating vent with which the tank is equipped. See Protectoseal Series 830, 8540, 6240, 16240 and 18540. 

Series 52500 Manway Cover Vents include pressure and vacuum relief.
Features
  • Vents directly to atmosphere
  • Sizes 16" (DN 400) through 24" (DN 600)
  • Pressure setting achieved by weight loading
  • Hinged/counterweight design allows for higher settings
  • Cover design allows for easy access to tank
  • Patented, FEP film “Air-Cushioned Seating”
  • Conforms to the latest ATEX Directive
  • Low-leak pallet design-certified test reports
  • Easy access manway facilitates inspection & repairs
  • Available in Carbon Steel, Aluminum & Stainless Steel
Protectoseal Series 51700 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. 

The Series 51700 design allows for higher pressure relief settings than are available on our Series 53300 Emergency Pressure Manhole Cover Vent. 

Series 51700 Manhole Cover Vents do not provide vacuum relief. 

Vacuum relief must be supplied by the operating vent with which the tank is equipped. See Protectoseal Series 830, 8540, 6240, 16240 and 18540. 

Series 52500 Manway Cover Vents include pressure and vacuum relief.
Features
  • Vents directly to atmosphere
  • Sizes 16" (DN 400) through 24" (DN 600)
  • Pressure setting achieved by weight loading
  • Hinged/counterweight design allows for higher settings
  • Cover design allows for easy access to tank
  • Patented, FEP film “Air-Cushioned Seating”
  • Conforms to the latest ATEX Directive
  • Low-leak pallet design-certified test reports
  • Easy access manway facilitates inspection & repairs
  • Available in Carbon Steel, Aluminum & Stainless Steel

Specifications

Approvals & Certifications

  • ATEX

Enclosure, Body Material

  • 316 Stainless Steel
  • Aluminum
  • Carbon Steel

Flange Size - 16” (DN 400)

  • 16” (DN 400) - PN 16
  • 16” (DN 400) - 150#

Flange Size - 18” (DN 450)

  • 12” (DN 300) - 150#
  • 12” (DN 300) - PN 16

Flange Size - 20” (DN 500)

  • 20” (DN 500) - 150#
  • 20” (DN 500) - PN 16

Flange Size - 24” (DN 600)

  • 24” (DN 600) - 150#
  • 24” (DN 600) - PN 16