Hebei Zexu Pipe Manufacturing Co., Ltd.
Hebei Zexu Pipe Manufacturing Co., Ltd.
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Power Plant Accessories DN500 304 Atmospheric Pressure Manhole, Boiler Manhole
Introduction:
Manhole refers to the opening structure used for personnel to enter and exit the equipment for installation, maintenance and safety inspection. It is mainly composed of short tube section (or short tube), flange and manhole cover with handle. From the perspective of safety inspection, the number of manholes required for pressure vessels and their minimum dimensions are shown in "Inspection Holes". The manhole materials are carbon steel and stainless steel. Manholes are divided into normal pressure and pressure manholes according to pressure conditions; manholes are divided into round, oval and rectangular manholes according to their shape. Rectangular manholes are only suitable for atmospheric equipment; manholes are divided into horizontal according to the installation position. Manholes are installed vertically; the fixing methods of manhole covers include rotating cover and hanging cover; the speed of manhole opening can be ordinary and quick-opening. The structure and size of manholes are generally standardized. Please refer to relevant manuals for selection or design.
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 not only avoid accidents caused by sudden overpressure or vacuum in the tank due to accidents, but also damage to the storage tank. 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.
| Material | SS304 or SS316L |
| Size | 435mm-535mm |
| Height | 75mm |
| Thickness | 8 or 10mm |
| Handle Material | Nylon or SS304 |
| Gasket: | Silicon, EPDM, FPM |
| Working pressure: | 0.5Bar |
| Surface Finishing | Ra≤0.8 |
| Working Temperature: | + 120°C (Silicon) |
| Packing Details: | Carton box or plywood case, or special packaging upon customer requirements |
