1. How to choose the material
　　Ripple compensator is designed to use corrugated compensator of the elastic element of effective telescopic deformation to absorb piping, conduit or vessel from such sources of heat bilges cold shrink the size change of a kind of compensation device, belongs to a kind of axial, lateral, and the angular displacement of the absorption compensation element.

Choose materials should be satisfied with the following conditions:
　　(1) the good welding performance, satisfied with the corrugated compensator in the welding technological requirements in the process of production.
　　(2) the high elastic limit, tensile strength and fatigue strength, guarantee the normal work of the corrugated compensator.
　　(3) good corrosion resistance, satisfied with the corrugated compensator work under different environmental requirements.
　　(4) the good plasticity, facilitate the corrugated compensator shaping, and through the subsequent treatment process (cold work hardening and heat treatment, etc.) to get enough of the hardness and strength.
　　Most manufacturers are using austenitic stainless steel, such as the material mark of 0 cr18ni9, 00 cr17nimo2 cr19ni10, 0, 00 cr17ni4mo2. In order to improve the corrosion resistance, the current heating pipe net corrugated compensator material chooses 316 or 316 l, the two kinds of materials used for thermal pipe network should be a relatively good price-performance materials.
　　2. How to don't qualified corrugated compensator created
　　Qualified compensator should have the following features:
　　1) corrugated compensator element, shell material must have the material certificate, according to the related scale the reinspection do not qualified.
　　2) other structure material must have the material certificate.
　　3) components and longitudinal seam must be 100% X-ray flaw detection, Ⅰ qualified, longitudinal weld tube section must be 100% X-ray flaw detection, qualified Ⅱ level.
　　4) element and shell girth weld required by penetrant inspection maintenance and kerosene leakage inspection qualified.
　　5) after the whole assembly, components and cylinder section, according to a scale required air tightness and strength test.
　　6) on the surface of corrugated compensator (internal and external) sheet shall not be greater than the negative deviation scratches or welding spatter.
　　7) corrugated compensator its overall size shall conform to the requirements of the drawings and related scale requirements.