what is a stainless steel manhole

Stainless steel manhole is a safety emergency ventilation device installed on the top of the storage tank, usually used with fireproof and mechanical breathing valve, which can avoid accidents caused by sudden overpressure or vacuum in the tank, damage the storage tank and the accident, and has a safe fire resistance role, is a safety device to protect the storage tank, especially suitable for storage materials with nitrogen capped vault atmospheric tank. It has the advantages of constant pressure discharge, constant pressure suction, flexible opening and closing, safe fire resistance, compact structure, good sealing performance, safe and reliable.
Stainless steel manholes are generally made of 304 and 316L steel plates as raw materials.
Manholes are divided into emergency pressure relief manholes, explosion-proof fire breathing manholes, tank top manholes, tank wall manholes and manholes with core, etc.