储罐本体包括：（1）与外部管道焊接连接的第 一道环向接头的坡口面;（2）螺纹连接的第 一个螺纹接头端面;

（3）法兰连接的第 一个法兰密封面;（4）专用连接件或者管件连接的第 一个密封面；（5）非承压元件与储罐的连接焊缝。

储罐本体中的主要承压元件包括罐顶、罐壁、罐底、公称直径大于或等于250 mm的接管和管法兰。储罐的安全附件，包括直接设置在储罐上的安全阀/呼吸阀、液体泄压阀、紧急切断装置、安全连锁装置、压力表、液位计、温度计、阻火器等。

常压储罐罐底板

正常情况下，罐底板仅起着传递油品和罐体重力的作用，故一般底板厚度在5mm以上。底板由钢板铺设焊接而成。其外表面与基础接触，容易受潮，内表面又经常接触油品中的沉积的水分和杂质，所以底板容易受到腐蚀，再加之不易检查和修理，所以要求罐底板焊接后无渗漏，防腐措施好。

常压储罐罐壁结构特点

罐壁是由若干层的圈板组装而成，每层圈板上的竖直焊缝均采用对接，圈板与圈板之间的环向焊缝则根据使用要求可以对接，亦可搭接。上、下圈板之间的排列方式有交互式、套筒式、对接式和混合式。对接焊缝在钢板厚度等于或大于6mm时，一般应开坡口，钢板搭接缝的高度一般为6~8倍板厚，常取35~60mm。

The tank body includes: (1) the groove surface of the first circumferential joint welded with the external pipeline; (2) The end face of the first threaded joint of the threaded connection;

(3) The first flange sealing surface of flange connection; (4) The first sealing surface connected by special connectors or pipe fittings; (5) Connection weld between non pressure bearing components and storage tank.

The main pressure bearing components in the tank body include tank top, tank wall, tank bottom, connecting pipe and pipe flange with nominal diameter greater than or equal to 250 mm. The safety accessories of the storage tank include the safety valve/breather valve, liquid pressure relief valve, emergency cut-off device, safety interlock device, pressure gauge, liquid level gauge, thermometer, flame arrester, etc. directly installed on the storage tank.

Bottom plate of atmospheric storage tank

Under normal circumstances, the bottom plate of the tank only plays the role of transferring oil products and tank gravity, so the thickness of the bottom plate is generally more than 5 mm. The base plate is laid and welded by steel plates. Its outer surface is in contact with the foundation, which is easy to get damp, and its inner surface is often in contact with the water and impurities deposited in the oil, so the bottom plate is easy to be corroded. In addition, it is not easy to check and repair, so it is required that the tank bottom plate should be free of leakage after welding, and the anti-corrosion measures should be good.

Structure characteristics of atmospheric tank wall

The tank wall is assembled by several layers of ring plates. The vertical welds on each layer of ring plates are butt welded. The circumferential welds between the ring plates can be butt welded or overlapped according to the use requirements. The arrangement modes between the upper and lower ring plates are interactive, sleeve type, butt joint type and hybrid type. When the thickness of butt weld steel plate is equal to or greater than 6mm, the groove shall be generally made. The height of steel plate lap joint is generally 6-8 times the plate thickness, usually taking 35-60mm.