HEAT EXCHANGER

PURPOSE:To make it possible to carry out repair work by allowing human access to any spot between horizontal heat exchanger tubes even if any attempt is made to place a heat exchanger to a lower elevation. CONSTITUTION:A plurality of horizontal tubes 7a of heat exchanger tubes placed in parallel in the broadwise direction are laid out so that they may penetrate a front wall 15a and a rear wall 15b. What is more, there are removably installed a plurality of split casings 15 capable of changing their vertical positions with a fixing member 4. Furthermore, it is so arranged that a narrow auxiliary casing 18 removably mounted between each of the split casings 15 and a manhole-formed wide auxiliary casing constitute an expansion casing device 19. Moreover, expandable bellows 14 are installed to a heat exchanger tube bending and vertical section 7b which connects the ends of the heat exchanger tube horizontal sections over each of the split casings 15 in zigzag.