不锈钢材质304/316L方形人孔

人孔是指用于人员进出设备以便安装、检修和安全检查的开孔结构。主要由短筒节（或短管）、法兰和带把手的人孔盖组成。从安全检查考虑，压力容器要求开设的人孔数及其最小尺寸见“检查孔”。人孔材料有碳钢和不锈钢。按受压情况人孔分为常压和受压人孔；按形状人孔分为圆形、椭圆形和矩形人孔，矩形人孔仅适用于常压设备；按安装位置人孔分为水平和垂直安装人孔；人孔盖固定方式有迥转盖和吊盖；人孔开后速度有普通式和快开式，人孔结构和尺寸一般都已标准化，可参照有关手册选用或设计。

人孔已有成型产品，直径通常为600mm。人孔中心距地板一般为750mm。便于工作人员在安装、清洗、维护时进出油罐或通风。

非金属油罐的人孔设在罐顶上，金属油罐的人孔设在罐壁最下圈板上。大都为直径600mm的圆孔，其中心距底板750mm，为油罐清洗或维修人员进出油罐用，又称作道门。检修清理油罐时刻利用人孔进行采光和通风。立式油罐的容量在5000m3以下时设1~2个人孔，5000m3以上的设2个人孔。人孔的安装应与进出油管线相隔不大于90°。当只设一个人孔时，应将其置于罐顶透光孔的对面；当设2个人孔时，其中一个设在透光孔的对面，另一个应至少与第一个人孔相隔90°。

Stainless steel 304/316L square manhole

Manhole refers to the opening structure used for personnel to enter and exit equipment for installation, maintenance and safety inspection. It is mainly composed of short tube section (or short tube), flange and manhole cover with handle. For safety inspection, the number of manholes required for pressure vessels and their minimum size are shown in "Inspection Holes". Manhole materials are carbon steel and stainless steel. Manholes are divided into normal pressure and pressure manholes according to the pressure condition; manholes are divided into circular, oval and rectangular manholes according to shape, and rectangular manholes are only suitable for atmospheric pressure equipment; manholes are divided into horizontal manholes according to the installation position and vertical installation of manholes; the fixing methods of manhole covers include swivel cover and hanging cover; the speed of manhole opening is ordinary and quick-opening, and the structure and size of manholes are generally standardized.

Manholes have formed products, usually 600mm in diameter. The center of the manhole is generally 750mm from the floor. It is convenient for staff to enter and exit the oil tank or ventilate during installation, cleaning and maintenance. square manhole

The manhole of the non-metal oil tank is set on the top of the tank, and the manhole of the metal oil tank is set on the lowermost ring plate of the tank wall. Most of them are round holes with a diameter of 600mm, the center of which is 750mm from the bottom plate, which is used for tank cleaning or maintenance personnel to enter and exit the tank, also known as the door. Always use manholes for lighting and ventilation during maintenance and cleaning of oil tanks. When the capacity of the vertical oil tank is less than 5000m3, there are 1~2 manholes, and if the capacity is more than 5000m3, there are 2 manholes. The installation of the manhole should be no more than 90° away from the oil inlet and outlet pipelines. When there is only one manhole, it should be placed opposite the light-transmitting hole on the tank top; when two manholes are set, one of them should be located opposite the light-transmitting hole, and the other should be at least 90 degrees apart from the first manhole. °.

产品图片：卫生级不锈钢制药用利勒方形人孔生产厂家

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