Water hammer has great influence on compensator. There is water hammer problem in steam pipeline, whether it is ground overhead, underground trench or directly buried pipe. The energy produced by water hammer can not be released, and it acts on the insulation structure, support, compensator and valve. Water hammer occurs more frequently at bend or pipe outlet. The pipeline is rigid and has strong water hammer resistance, the corrugated compensator is a flexible body, which is unable to resist the shock vibration caused by the surge of pressure wave in the instant of water hammer. From the point of view of the damage, one is the ripple, the other is the diversion sleeve, and the weakest link is the corrugation of the compensator. The result of water hammer is that the compensator is deformed or even ruptured, and the diversion sleeve is inverted or torn, which seriously endangers the safety of the pipe network. Measures to prevent water hammer: in addition to reasonably determining the pipe diameter according to the heat load, setting up a good drainage point, effectively and timely drainage, The design and arrangement of compensator should also be improved. It is recommended that the compensator stay away from the elbow and overturn and fix the bracket near the other side. In this way, even if there is a small amount of water in the pipeline, as the position is far away from the compensator, the damage caused by the water hammer on the compensator can be greatly reduced. In addition, the use of external pressure compensator to improve the form of diversion sleeve can also play a role in preventing water hammer.

Effect of site change on compensator:

Although the original design of the heat pipe network is very good, the obstacles encountered after construction, the actual situation of the site is often very different from the design, so a large number of actual design changes have to be made. As long as the natural compensation pipeline is properly treated, it will not have a great effect on the pipeline of axial compensator, but it will have a great influence on the pipeline of axial compensator. Quite a few construction units are not fully familiar with this. After the pipeline has changed its direction, some fixed supports have changed from not bearing pressure thrust to pressure thrust or to producing a large bending distance, resulting in a significant change in the form of the support’s mechanical structure. Improper handling is very easy to push the fixed support, resulting in an accident. In the case of large pipeline change, attention should be paid to whether the force form of pipeline conforms to the basic principle of compensator arrangement. Through reasonable section, the pipeline is in straight line, the inflection point is controlled, and the bending moment and lateral thrust acting on the fixed and guiding support are reduced so as to ensure the safety and reasonableness of the pipe system.

Prevent corrosion and delay the service lifetime of compensator:

There are many factors affecting the service lifetime of compensator, one is failure instability, the other is corrosion. The service lifetime of the compensator used in urban heat network is about 600-10000 times, and the safety factor is 15 times. If a continuous running hot network starts about 20 times a year, its normal service life should be more than 20 years. However, it is not the case in practical applications. It can be replaced in three or five years, and almost no compensator was installed more than a decade ago. In the pipeline design, not only the position of the fixed support should be reasonable, the distance of the guide support should be appropriate, the guide support should have measures to prevent the compensator from losing stability, but also the corrosion prevention should be considered in the design arrangement. Through actual inspection, we found that it is arranged in the inspection well Or the compensator in the gutter corrodes more quickly, and the compensator on the well supply pipe is the most serious in the hot water pipe network, while the backwater pipe is basically not corroded. The main reason is that the primary battery effect is formed in the feedwater compensator and pipe section, then electrochemical corrosion occurs. This kind of problem can be solved by the method of design optimization. It is better not to arrange the compensator in parallel. when the compensator is arranged, the spacing of compensator should be increased when conditions are available, and it is better to use the method of full burying without checking well and mark well when laying. If the well must be located in the inspection well, waterproof and heat preservation must be done to prevent the entry of sewage rain water, reduce the corrosion conditions, and block the formation of the primary battery effect loop.