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Function of Manhole on Tank Wall and Relevant Connection Dimensions
Release time:2021-6-11

Because the tank wall manhole is located in the lower part of the oil tank, the manhole bears a lot of liquid pressure. In order to prevent leakage, the installation quality of the manhole must be strictly required. The flanges and cover plates are processed with sealing water lines, and care should be taken to protect them during construction to avoid oil leakage during use. Make a mark every time the manhole is removed, so as to avoid dislocation during reinstallation and affect the tightness. When installing the nuts on the manhole cover, apply force evenly in pairs to prevent oil leakage caused by deformation of the cover or uneven force.

The tank wall manhole is installed in the lower part of the storage tank, and is mainly used for the staff to enter and exit the storage tank. The main material of the tank wall manhole is carbon steel and stainless steel. The tank wall manhole does not have a reinforcing plate when it leaves the factory. If customers need non-standard manholes, they need to provide drawings. We can customize various manholes according to their needs.

Main model and connection size of tank wall manhole


Drawing number

Weight (㎏/set)                

Installation size (mm)                


















334             Ф750            



Introduction to manholes

The manhole is a safety emergency ventilation device installed on the top of the storage tank. It is usually used in conjunction with fire extinguishers and mechanical breathing valves. It can prevent accidents from damaging the storage tank when the tank is suddenly overpressured or vacuumed due to accidents. It is a safety device to protect the storage tank, and it is a safety device to protect the storage tank. It is especially suitable for the vaulted atmospheric tank with nitrogen topped by the storage material. It has the advantages of constant pressure discharge, constant pressure suction, flexible opening and closing, safe fire resistance, compact structure, good sealing performance, safety and reliability.

Manholes are divided into emergency pressure relief manholes, explosion-proof fire-resistance breathing manholes, tank top manholes, tank wall manholes and cored manholes.

Manholes are generally made of 304, 316L stainless steel plate or carbon steel.

Scope of application: urban construction, chemical industry, metallurgy, petroleum, pharmaceutical, food, beverage, environmental protection.