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美国ＥＪＭＡ标准中推荐的管系和管段，其膨胀节的补偿量均为确定值，即每个膨胀节的补偿量与膨胀节的刚度、中间摩擦力无关，我们称之为膨胀节补偿量确定的管系。国内近几年新发展起来的管系，有一些因膨胀节的结构和膨胀节的放置方法引起了膨胀节补偿量随膨胀节刚度的不同和膨胀节间设置摩擦支架、中间法兰或套筒导向摩擦力不同而不同的随机变化，使一个管段中的不同膨胀节补偿量具有不确定性，我们称这种管系为膨胀节补偿量不确定的管系。本文重点分析其间差异、变形特性及问题，同时提出一种方法以便把膨胀节补偿量不确定管系转变为膨胀节补偿量确定的管系。合理的应用膨胀节以及使膨胀节具有可确定性的结构，以期使国内新发展起来的管系及其膨胀节的结构既有发展又更趋可靠与合理。
The recommended pipe system and pipe section in the United States EJMA standard, the compensation of expansion joints are all determined, that is, the compensation amount of each expansion joint has nothing to do with the stiffness and intermediate friction of the expansion joint, which we call to determine the compensation amount of expansion joint The piping system. Some newly developed piping systems in China in recent years have some problems that the compensation amount of expansion joints varies with the stiffness of expansion joints and the friction brackets are arranged between expansion joints due to the structure of expansion joints and the placement of expansion joints. Due to the different random changes of the guiding frictional force, the compensation amount of different expansion joints in a pipe section is uncertain. We call this pipe system a piping system with indefinite expansion compensation. This article focuses on the analysis of the differences and deformation characteristics and problems. At the same time, a method is put forward to transform the uncertain system of expansion joint compensation into the piping system of expansion joint compensation. Reasonable application of expansion joints and expansion joints with certainty of the structure, with a view to the newly developed pipe system and expansion joints of the structure of both the existing development and more reliable and reasonable.