304 stainless steel horizontal lifting cover manhole

The manhole of the horizontal lifting cover is installed at the lower part of the tank wall, and it is the entrance and exit of the workers when they are building the tank, cleaning the tank and emptying the tank. The manhole with the horizontal lifting cover is mainly installed on the tank top for workers to import and export. Manhole is flange industry more commonly used a kind of flange, as a result of appearance like a cover so called flange cover, it is installed in one end of the pipe, used to block the pipe, so that the material inside the pipe is not easy to benefit. Its appearance is different from flat welding flange, high neck flange and other common flanges, blind flange only in the edge of the bolt drilling, the middle is solid, there is no pipe hole. (what is the blind flange) sealing surface form has many kinds, plane, convex surface, concave and convex surface, tenon groove surface, ring connection surface and so on is the common form of the blind flange. The horizontal hanging cover with neck butt welding flange manhole is a kind of hole with a cover, through which people can enter and exit the drain, boiler, downpipe, weak current well used for telecommunication and cable TV, and the internal channel used for large bridge overhaul. Note for manhole of horizontal lift cover: the working temperature and minus impact working pressure can be applied only for pressure parts of manhole which don't include bolts and pads. The pressure and temperature range of bolts (columns) and gaskets shall be determined according to the corresponding fastening and gasket standards.