Reasons for the failure of the bellows compensator

The bellows compensator plays a role in compensating for the displacement caused by thermal expansion and cold contraction in the pipeline system. In addition to the incorrect installation method, the bellows compensator will fail during use. What are the reasons Will the bellows compensation fail?

Reasons for the failure of the bellows compensator

1. Failure of stressed components caused by improper thermal insulation: thermal insulation treatment is not required for the corrugated shell and pulling plate parts of the bellows compensator. Such as: hinged corrugated compensator pull plate, vertical plate, double rod type corrugated compensator and other stress components. Before heat preservation, you can communicate with the manufacturer how to heat the bellows compensator.

2. The abnormal deformation of the pipeline caused by the unremoved shipping rod: the bellows compensator after installation is used without removing the pull rod that plays the role of transportation. Due to the high rigidity of the transport rod, it may be pushed to the fixed bracket and the ambient temperature changes. Causes thermal expansion of the pipe causing the shipping rod to bend.

3. Plane instability caused by the increase of ambient temperature: The temperature changes greatly during use. When the temperature increases instantaneously, the medium in the pipeline expands continuously with the increase of temperature, and the pressure in the pipeline increases greatly, resulting in the loss of plane of the bellows. stable. In order to avoid this phenomenon, after the delivery, it is necessary to avoid the medium in the pipeline being in a fully closed state, make sure that the pressure relief valve is in a normal state, and detect the pressure to avoid overpressure. Keep working pressure and flow rate steady and avoid large fluctuations in pressure and flow rate.

4. Axial instability of the external pressure corrugated compensator caused by the tensile displacement: when the external pressure corrugated compensator absorbs the thermal expansion of the pipeline, the corrugated pipe is subjected to tensile displacement. At this time, the wave moment becomes larger, and the antinode of the corrugated pipe is straight. Partially inclined, the wave crest tends to shrink inward under pressure stress. The pre-displacement treatment of the bellows compensator before installation can reduce the tensile displacement of the bellows in the working state and improve its axial stability.

There are many reasons for the failure of the bellows compensator, including the corrosion of the medium and the lack of installation of fixed brackets. The specific reasons still need to be analyzed in detail.

The stainless steel corrugated soft connection mainly meets the connection and compensation needs in various complex industrial occasions. The stainless steel corrugated soft connection has excellent reliability and meets the use requirements in complex industrial systems. So, how long is the service life of the stainless steel corrugated flexible connection?

(1) The influence of the service life of the corrugated compensator is introduced in detail from the installation of the corrugated compensator. If there is no problem with the selection quality, design and installation, and reasonable maintenance in a non-corrosive environment, the service life of the corrugated compensator can be as long as more than 20 years, and how long is the service life of the stainless steel corrugated soft connection? The service life can reach more than 10 years. There are many reasons that affect the service life of the corrugated compensator. The normal design of the corrugated compensator is 2000 times, but it is greatly affected by the environment.

(2) Before the selection of stainless steel corrugated flexible connection, the content of lC first-class corrosive medium should not be tested on the water quality or soil of the underground pipeline laying site, or only the water quality in areas with high groundwater level should be tested, and no attention should be paid to whether the groundwater contains excessive corrosive media. Feel free to choose a material. Design fatigue life issues. In some projects, the design fatigue life of the corrugated compensator is not considered in combination with the external working environment or the service fatigue life is determined to be too low.

(3) The installation position of the corrugated compensator is unreasonable. Do not construct according to the requirements of the product manual of the corrugated compensator. Do not operate according to design requirements and construction specifications. In the working state, the insulation layer and the protective layer cannot be stretched, so they are broken, and the groundwater can directly contact the working tube and the outer cavity of the compensator. Even if some compensators consider the waterproof sealing ring on the movable end shell, the service life of the corrugated compensator How long has it been, in fact, as long as the design is correct, the product model is correct, and the construction is carried out according to the installation standards of the corrugated compensator, the service life of the corrugated compensator will be greatly improved.