Emergency Relief Vent / Manhole Cover

• Manhole covers – emergency relief valves
In case of fire exposition of the tank inner pressure will increase and the flow of gasses exceeds the flow rate of breather valves. The manhole cover – emergency relief can cover the need of this increased gas flow and will
protect the tanks against any damage.manhole cover emergency pressure relief valve
• Designed API Standard 2000.
• Series 501.1 e 501.2 manhole covers are designed with a flanged body and a cover that is free to open when exposed to high pressure.
• All gasket are in Neoprene, PTFE or Viton.
• Standard dimensions are 20″ and 24″ with API 650, ANSI 150 or UNI PN10.