compensator service life and its design, come and learn,
axial compensator plays a crucial role in the line, so its material selection and installation need to be meticulous, coupled with regular maintenance, so that the line runs for a long time.
Under normal circumstances, quality compensators are very durable, but some problems that occur in the design can lead to failure and shortened life. Let's take a look at the relationship between the service life of the compensator and its design. First of all, we must know that the design of the compensator mainly considers three factors: compressive strength, stability and fatigue. Although the national standard and the US EJMA standard have clear provisions on the calculation and evaluation of these aspects, it was found from years of application practice and compensator failure analysis that the stability calculation and evaluation methods given in this standard are not broad enough, and the fatigue life only gives a relatively rough boundary range.
In addition, it is not ruled out that sometimes a product that fully meets the standards requirements will have some problems in actual use. For example, the pre-transformation state of the inner pressurized compensator is prone to plane instability in the pressure test, the large-diameter outer pressurized compensator is prone to circumferential instability in the full displacement working state, and the small-diameter duplex pull rod compensator and hinge compensator are prone to column instability in the full displacement working state. The deformation of the compensator will not only affect its stability, but will also provide favorable environmental conditions for to corrode . At present, compensators are mostly made of 1Cr18Ni9Ti, which is made of stainless steel material . Under the combined action of tensile stress during operation and internal stress formed during molding, such as chlorine and sulfur ions in the internal and external environment of the compensator, are susceptible to corrosion and damage by crystal stress. The higher the temperature, the higher the concentration of chlorine and sulfur ions, and the faster the corrosion and damage rate.
