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非金属油罐的人孔设在罐顶上，金属油罐的人孔设在罐壁最下圈板上。大都为直径600mm的圆孔，其中心距底板750mm，为油罐清洗或维修人员进出油罐用，又称作道门。检修清理油罐时刻利用人孔进行采光和通风。当只设一个人孔时，应将其置于罐顶透光孔的对面；当设2个人孔时，其中一个设在透光孔的对面，另一个应至少与第一个人孔相隔90°。
法兰人孔立式油罐的容量在5000m³；以下时设1~2个人孔，5000m³以上的设2个人孔。人孔的安装应与进出油管线相隔不大于90°。
Stainless steel manhole for molding products, the diameter is usually 600mm. Manhole center from the floor general for 750mm. Facilitate staff in the installation, cleaning, maintenance and out of oil tanks and ventilation.
The man with a non metal oil tank is arranged on the top of the tank, and the man in the metal tank is arranged on the bottom of the tank wall. Mostly for a 600 mm diameter hole, the heart from the base plate 750mm, tank cleaning or maintenance personnel in and out of the tank, also known as the door. Maintenance cleaning tank moment daylighting and ventilated manhole. When a person is only a hole, it should be placed in the top of the hole of the top of the tank is opposite; when the 2 individual holes, one is located in the opposite side of the transparent hole, the other should be at least 90 with the first person Kong Xiangge.
Manhole flange vertical oil tank capacity in 5000m³; the 1~2 5000m³ a personal hole, 2 hole above. The manhole should be installed with the inlet and outlet pipe lines are not more than 90 degrees.
