儲罐的容量與其幾何尺寸有關。按鋼材耗量最小的原則，對大型的立式儲(chu)罐，當公稱容量在1000～2000mm³時，取高度約等于直徑；對3000mm³以上的儲罐取高度等于3/8～3/4的直徑較為合理。儲罐的公稱容量是指按幾何尺寸計算所得的容量，向上或向下圓整后以整數表示的容量。

  由(you)于(yu)罐(guan)(guan)內(nei)介質的(de)溫度、壓力變化等原因(yin)，儲(chu)罐(guan)(guan)不能(neng)完全(quan)裝滿，應留有(you)一定的(de)空(kong)間，而且液體儲(chu)罐(guan)(guan)工(gong)作時(shi)液面(mian)允(yun)許有(you)一個上下(xia)波動(dong)的(de)范圍。這一上下(xia)波動(dong)范圍內(nei)的(de)容(rong)(rong)量(liang)(liang)稱(cheng)為工(gong)作容(rong)(rong)量(liang)(liang)，儲(chu)罐(guan)(guan)實(shi)際允(yun)許儲(chu)存的(de)最大容(rong)(rong)量(liang)(liang)稱(cheng)為儲(chu)存容(rong)(rong)量(liang)(liang)，所以(yi)，儲(chu)罐(guan)(guan)公(gong)稱(cheng)容(rong)(rong)量(liang)(liang)最大，工(gong)作容(rong)(rong)量(liang)(liang)最小(xiao)，儲(chu)存容(rong)(rong)量(liang)(liang)居中。立式儲(chu)罐(guan)(guan)容(rong)(rong)量(liang)(liang)示(shi)意見圖12.3。液體儲(chu)罐(guan)(guan)工(gong)作時(shi)，其實(shi)際存量(liang)(liang)不得(de)(de)大于(yu)儲(chu)存容(rong)(rong)量(liang)(liang)，也不得(de)(de)小(xiao)于(yu)儲(chu)存容(rong)(rong)量(liang)(liang)減去工(gong)作容(rong)(rong)量(liang)(liang)之差。