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Series 52500 Emergency Pressure / Vacuum Manhole Cover Vent

Brand: Protectoseal Company
Protectoseal’s Series 52500 Manhole Cover with pressure and vacuum relief, provides both emergency pressure relief and vacuum relief when installed on the manhole of a storage tank. 

In emergency situations (external fire involvement of the tank), normal venting devices may be too small to prevent over-pressurization of the tank. 

The Series 52500 provides the necessary pressure relief capacity to maintain the tank in a safe operating range. 

The integral vacuum vent provides additional protection against tank collapse due to excessive vacuum in the vapor space.
Features
  • Vents directly to atmosphere
  • Sizes 16" (DN 400) through 24" (DN 600)
  • Pressure setting achieved by weight loading
  • Vacuum setting achieved by spring loading
  • Reseats automatically
  • Patented, FEP film “Air-Cushioned Seating”
  • Low-leak pallet design-certified test reports
  • Conforms to the latest ATEX Directive
  • Easy access manway facilitates inspection & repairs
  • Available in Carbon Steel, Aluminum & Stainless Steel
Protectoseal’s Series 52500 Manhole Cover with pressure and vacuum relief, provides both emergency pressure relief and vacuum relief when installed on the manhole of a storage tank. 

In emergency situations (external fire involvement of the tank), normal venting devices may be too small to prevent over-pressurization of the tank. 

The Series 52500 provides the necessary pressure relief capacity to maintain the tank in a safe operating range. 

The integral vacuum vent provides additional protection against tank collapse due to excessive vacuum in the vapor space.
Features
  • Vents directly to atmosphere
  • Sizes 16" (DN 400) through 24" (DN 600)
  • Pressure setting achieved by weight loading
  • Vacuum setting achieved by spring loading
  • Reseats automatically
  • Patented, FEP film “Air-Cushioned Seating”
  • Low-leak pallet design-certified test reports
  • Conforms to the latest ATEX Directive
  • 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