Energy boilers for seismic impacts are different from other objects. Their individual characteristics are associated with the frame construction and the boilers used pipes of great length. The most important parameter used in the calculation of seismic effects is the damp-ratio. The damp-ratio is different for pipes and frame, and this creates difficulties in performing calculations. The paper proposed a method for taking into account the difference of the damp-ratio and estimated the calculation error in the case of the use of the damp-ratio for the frame when calculating the entire boiler without taking into account the features of pipe damping. According to the results of calculations, the elements with the greatest deformations and the elements with the highest stresses in the metal are identified in the boiler structure.