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机械工业部部标准《锅壳式锅炉受压元件强度计算》关于孔的加强计算,系引用《水管锅炉受压元件强度计算》标准。水管锅炉的人孔是开在承受内压力的凸形封头上,而锅壳式锅炉的人孔则开在锅壳和前管板上;《锅壳式锅炉受压元件强度计算》中表16画的3种开孔加强结构型式,均为焊接管接头加强型式,而无人孔加强圈结构型式,无所导循,以致于有些锅炉厂往往算错。
Mechanical Industry Ministry standard “shell boiler pressure element strength calculation” on the hole to strengthen the calculation, the Department of reference “water tube boiler pressure element strength calculation” standard. The manhole of the water tube boiler is open on the convex head which receives the internal pressure, while the manhole of the shell and tube boiler is opened on the shell and the front tube plate. The “Calculation of the strength of the pressure element of the shell and tube boiler” 16 paintings of three kinds of openings to strengthen the structure, are welded pipe joints to strengthen the type, but no manhole reinforcement ring structure, nothing to guide, so that some boiler plant often wrong.