Atmospheric pressure is the most common manhole manhole, the manhole is without pressure, usually installed in the tank top level, stainless steel manhole cover, production workers or workers in the construction of repair tank, tank cleaning, inverted tank entrances and manhole strength and sealing technology is the key for the first, but with pressure for manhole with the level of empowerment, manhole cover, manhole pressure strength and sealing requirements of. The manhole should be installed with the inlet and outlet pipe lines are not more than 90 degrees. Atmospheric pressure is the most common manhole manhole, the manhole is without pressure, usually installed in the tank top level, stainless steel manhole cover, production workers or workers in the construction of repair tank, tank cleaning, inverted tank entrances and manhole strength and sealing technology is the key for the first, but with pressure for manhole with the level of empowerment, manhole cover, manhole pressure strength and sealing requirements of. The manhole should be installed with the inlet and outlet pipe lines are not more than 90 degrees. Install the manhole cover bolt, diagonally uniform force, to prevent deformation of manhole cover. Our company specializes in manufacturing all kinds of sanitary manhole rotary quick open manhole cover 360 degrees rotation quick open manhole, rotary cover stainless steel round 360 degrees outside atmospheric pressure (fast) processing and open manhole flange cover plate is provided with a sealing ring, in the construction should pay special attention to seal with 3mm thick asbestos rubber gasket, are not allowed to fracture