中、低压锅炉的锅筒与水管之间的连接一般采用胀接连接。对低压锅炉大量的对流管管束，因承受压力低，胀接完全可以保证其有足够的强度和较好的严密性。对中压锅炉随着容量增加、压力升高，锅筒壁厚增厚，水管直径增大，给胀接带来许多困难。本文通过对中厚壁锅筒管壁胀接的分 Medium and low pressure boiler drum and the connection between the general use of expansion joints. For a large number of low-pressure boiler convection tube bundle, due to bear the pressure low, swell fully guarantee its sufficient strength and better tightness. As the capacity of the medium pressure boiler increases, the pressure increases, the thickening of the drum wall thickness increases the diameter of the water pipe, which brings many difficulties to the expansion joint. In this paper, through the wall of the thick-walled barrel expansion joint