Material: 304/316 stainless steel, carbon steel Q235B

Specification Model: Production and Processing according to Graph, DN200-DN700

Description

The manhole flange is located on the floor of the earth with a diameter of 50 cm or 60 cm. In the installation, cleaning and maintenance of oil tanks, staff can enter and exit the tanks through manholes, or use manholes for ventilation. Manhole has atmospheric manhole, manhole on tank top, manhole on tank must, manhole with core, etc. Manhole is located in the lower part of oil tank and bears great liquid pressure. In order to prevent leakage, the installation quality of manhole must be strictly required. Sealed water lines are processed on flanges and cover plates. In construction, attention should be paid to protection so as to avoid oil leakage in use. Every time the manhole is removed, it should be marked so as to avoid misalignment and influence the tightness. When installing nuts on manhole cover plate, uniform force should be exerted diagonally in pairs to prevent oil seepage caused by deformation or uneven force of cover plate.

Circular welded manhole, circular thermal insulated manhole, rectangular manhole, rectangular thermal insulated manhole, flue ash outlet hole, atmospheric manhole, circular cover plate flat welded flange manhole, circular cover flange manhole with neck butt welded flange, vertical hanging cover flange manhole with neck butt welded flange, horizontal hanging cover plate flat welded flange manhole, water Flat lifting cover plate type butt welding flange manhole, elliptical rotary cover quick opening manhole, rotary arch cover quick opening manhole, atmospheric pressure hand hole, plate type flat welding flange hand hole, neck flat welding flange hand hole, neck butt welding flange hand hole, rotary cover neck butt welding flange hand hole, atmospheric pressure quick opening hand hole, rotary cover quick opening hand hole, pipeline mirror, etc.

Function or Use

Large closed containers (tanks, towers, pipelines) will leave a hole for personnel or materials to enter and exit because of maintenance or other needs, and the passage will be made into a flanged connection form. Normally, it is sealed with a blind flange and opened during overhaul.