An axial compensator is used in a certain thermal pipeline, and the construction team adopts the sectional compression test. A temporary blind plate is set up at the spot of its own selection. The blind plate force does not act on the main fixed support, but on the secondary fixed support. The fixed support will be broken when the pressure is raised by 1.5 times. When the axial compensator line is pressed by sections, the main fixed support which can withstand the pressure of hydraulic test should be selected. If this can not be done, the secondary fixed support with blind plate force should be temporarily strengthened to enable it to withstand blind plate force. Because the thrust difference of the primary and secondary fixed support is too large, it is difficult to implement the temporary reinforcement method, the best way to do that is to think ahead of the design of the hydraulic test or the blow up scheme. The location of the compressed sub-point is best determined by the owner, the designer and the construction unit, and the design unit shall be responsible for the technical settlement, and the owner shall organize the implementation according to the opinions of the design unit.

Effect of construction installation on axial compensator:

Deviation is easy to appear in the process of construction installation when the compensator arrangement form is unreasonable or the design is not appropriate. The direction of force is not axial force, but angular force which produces a certain torque for the compensator. For the axial compensator, the wall of the pipe is less able to resist torque and is easy to lose stability. Therefore, in order to ensure that the coaxial tolerance of the pipe in the installation of the compensator is minimized, it is suggested that the pipe section should be laid before installing the compensator. Next, the pipe should be cut off at the place where the compensator is prepared to be installed, Then, adopt the method of pipe cutting installation, the compensator should be installed to weld. Although it causes a small amount of pipeline waste, it can ensure pipe concentricity.