水容量很大的蘭开夏双火管鍋爐或是康尼斯單火管鍋爐,从其單位蒸發量来講,所占的建筑面积和所消耗的金屬重量都相当大,并且鍋爐的效率也很低。虽然如此,可是它却具有这种特性:当以人工間歇性地添煤、上水又不均匀甚至于蒸汽用量有波动时,它还是能够比較稳定地运行,而且維护与檢修都很簡單。故这种比較“原始”一些的鍋爐,不仅是在很多的工厂企業中一直沒有被淘汰,而且还有不少地方国营的工厂仍旧在继續承制蘭开夏双火管鍋爐。 The Lancashire double-fired boilers or the Cones single-fired boilers with large water capacity have a large floor area and metal weight consumed in terms of unit evaporation, and the efficiency of the boilers is also very high. low. In spite of this, it has such characteristics: When artificially intermittently adding coal, even if the water is not even even when the steam consumption fluctuates, it can still be operated stably, and maintenance and repair are very simple. Therefore, the relatively “raw” boilers have not been eliminated in many factories and factories, and there are still many local state-owned factories that continue to contract Lancashire double-fired boilers.