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描述

Manhole is divided into emergency relief manhole, explosion-proof and fire-proof breathing manhole, manhole on tank top, manhole on tank wall and manhole with core.

Manhole has been moulded with a diameter of 600 mm. The center of manhole is 750 mm from floor. It is convenient for staff to enter and leave oil tank or ventilation during installation, cleaning and maintenance.

The manhole of the non-metallic oil tank is on the top of the tank, and the manhole of the metal oil tank is on the lower ring plate of the tank wall. Most of them are round holes with a diameter of 600 mm, the center of which is 750 mm away from the bottom plate. They are used for tank cleaning or maintenance personnel to enter and exit the tank, also known as doors. Manhole is used for lighting and ventilation when oil tank is repaired and cleaned. When the capacity of vertical oil tank is below 5000m3, there are 1 to 2 manholes and 2 manholes above 5000m3. The installation of manhole should be no more than 90 degrees apart from the oil pipeline. When only one hole is set, it should be placed opposite the transparent hole on the top of the tank; when two holes are set, one of them is located opposite the transparent hole and the other should be at least 90 degrees away from the first hole.

The manhole shall be located near the right side of the exit and exit tubing, and the manhole shall be as close as possible to the closed door of the tank room so that personnel can enter and exit, repair the tank and ventilate the nozzle.

Because the manhole is installed on the lower body ring of the oil tank, leakage prevention is particularly important. It is required that the flange joint should be flatness and free from drift and torsion. Strengthened plate and flange should be cut on the whole steel plate as far as possible without splicing. Flanges and cover plates are machined with sealing rings, so special attention should be paid to their protection in construction. Sealing with 3 mm thick asbestos rubber gasket, no cracking allowed. When installing the bolts on the manhole cover plate, the force should be diagonally uniform to prevent the deformation of the hole cover.