Manhole flanges have been formed products

　　Manhole flanges have been formed products, the diameter is usually 600mm. The manhole center is 750mm from the floor. Easy to staff in the installation, cleaning, maintenance, access to the tank and ventilation. The manhole of the non-metallic oil tank is arranged on the top of the tank, and the manhole of the metal oil tank is arranged on the bottom circle plate of the tank wall. Most of the diameter of 600mm hole, the center distance from the floor 750mm, 4X3/4 stainless steel Pipe Fittings threaded Flange for tank cleaning or maintenance personnel out of the tank, also known as the door. Maintenance Clean up the tank at all times using the manhole for lighting and ventilation. When the capacity of the vertical oil tank is 5000 mm or less, there are 1 to 2 manholes, and two orifices of 5000 mm or more are provided.