The flange is installed with various kinds of stainless steel with top, as the staff for installation and maintenance, cleaning and maintenance of the import channels and vents! The general use of 316 stainless steel manhole 304 and two kinds of steel as raw materials for production, can also be produced according to customer requirements. Manhole should be one in the right side near the inlet and outlet pipe, and try to make the holes are confined to the tank room closed, so that the staff, maintenance of tanks and ventilation to take over. Manhole is installed at the bottom of the tank body ring, it is particularly important to prevent leakage. Requirements of the two flanges must be guaranteed to ensure that the surface roughness, no floating phenomenon. Strengthen the plate and flange should be as far as possible in the whole steel plate cutting without splicing, flange and cover plate processing with sealing ring, in construction should pay special attention to protection. Seal with 3mm thick asbestos rubber gasket, not allowed to crack. Install the manhole cover bolt, diagonally and force, to prevent deformation of manhole cover