Stainless steel manhole cover is installed on top of the tank safety emergency ventilation device, usually with flame damper, using mechanical breather valve, can avoid the accident caused sharp overpressure or vacuum in tank and tank damage and accident, security fire effect, is to protect the safety of tank device, especially suitable for the storage of materials with nitrogen gas cap vault atmospheric tank. Emissions with constant pressure and constant pressure suction, flexible open and close, fire safety, compact structure, good sealing performance and safety can be *, etc. The design of the manhole, mainly for the convenience of staff working in and out of the tank with an equipment maintenance. To meet the requirements of the use of pressure and the sealing property; in the manhole lid tube section and links in the upper and lower welding two pieces of the flange, and the lower bolt and screw tight. Many technology in chemical production need in person...

Stainless steel manhole cover is installed on top of the tank safety emergency ventilation device, usually with flame damper, using mechanical breather valve, can avoid the accident caused sharp overpressure or vacuum in tank and tank damage and accident, security fire effect, is to protect the safety of tank device, especially suitable for the storage of materials with nitrogen gas cap vault atmospheric tank. Emissions with constant pressure and constant pressure suction, flexible open and close, fire safety, compact structure, good sealing performance and safety can be *, etc. The design of the manhole, mainly for the convenience of staff working in and out of the tank with an equipment maintenance. To meet the requirements of the use of pressure and the sealing property; in the manhole lid tube section and links in the upper and lower welding two pieces of the flange, and the lower bolt and screw tight. Many in the chemical production process need to add material in manhole place, because often open manhole covers, acidic material easy to flow, corrosion of the flange, eventually make the kettle cover scrap. This can cause a lot of damage to property. Even if the repair is proper, acidic material flow will still be corrosion of the flange. In order to thoroughly solve the problem of the open manhole covers frequent corrosion of the flange, we have to repair the damaged flange, equipped with a plastic flange (plastic material to consider the choice of medium corrosion in reaction kettle), under the plastic flange with same size manhole flange, flange hole diameter according to the need to decide, flange topped with a plastic plug. Plastic flange connected to the manhole covers with cushions, when feeding, open the plastic cover and the cover, so it can avoid the material flowing corrosion manhole flange. This is equal to give flange added a shield, avoid the material corrosion of manhole flange, played a large role. Stainless steel manhole selection method When choose stainless steel manhole, there are several matters is you must pay attention to, such ability can at the lowest price buy the best cost-effective manhole products, in the later process easier then in operation and maintenance, the following simple introduce: 1, understanding nominal size manhole relevant specifications, standards, allowable approval can choose is suitable for the manhole corresponding requirements; 2, confirm manhole applicable medium, working pressure, temperature, or according to the specific working condition of the medium, to choose the corresponding manhole style, material; 3, determine the structure style: such as circular manhole manhole, ellipse, square manhole, etc. 4, determine the manhole main materials: stainless steel 304, 316 l stainless steel, etc;