近几年来,美国在各种工业管道的设计和施工中,根据管子承受的内外压力,应用诺谟图方法,创造了快速确定管壁厚度的图解法。这种新方法的特点是: (1) 快而方便,可节省计算时间; (2) 切合实际,受到设计和施工人员的欢迎。一、管内受压的管道在内压作用下的管壁厚度,美国通常是用下列公式计算的(原文英制单位): In recent years, in the design and construction of various industrial pipelines, the United States has created a graphic method for quickly determining the pipe wall thickness according to the internal and external pressures that the pipe is subjected to and using the nomogram method. The new method is characterized by: (1) fast and convenient, which can save computing time; (2) be realistic and well received by design and construction personnel. First, the pressure pipe pipe Under pressure in the wall thickness, the United States is usually calculated using the following formula (in English original units):