The corrugated pipe has good plasticity and can obtain sufficient hardness and strength through subsequent processing processes. And spiral steel wire can be embedded in ordinary plastic corrugated pipes to make stainless steel corrugated pipes.
Methods to identify the quality of corrugated pipes:
1. The bellows expansion joint cannot bear weight and should be hoisted separately. Bellows expansion joints are not allowed to be hoisted together with the pipe after welding unless reinforcement measures are taken.
2. The model, specification and support configuration of the bellows expansion joint should be checked before installation to meet the design requirements.
3. Pay attention to the bellows expansion joint with a lining tube, so that the direction of the lining tube is consistent with the flow direction of the medium, and the hinge rotation plane of the plane angle bellows expansion joint is consistent with the displacement plane.
4. Cold-tightening bellows expansion joints are required, and auxiliary components used for pre-deformation should be removed after the pipe system is installed.
5. Except for pre-deformation that requires pre-stretching or compression, it is strictly prohibited to use the method of bellows deformation to adjust the installation deviation of the pipe, so as not to affect the normal function of the bellows expansion joint, reduce the service life, and increase the piping system, equipment pipes and supports. component load.
6. During the installation process, welding slag is not allowed to splash on the surface of the bellows expansion joint, causing the bellows to suffer other mechanical damage.
7. After the pipeline is installed, the auxiliary positioning mechanism on the bellows should be removed immediately for installation, transportation and protection, and the limit device should be adjusted to the specified position according to the design requirements.
Precautions:
(1) Good plasticity facilitates the processing and forming of corrugated pipes, and sufficient hardness and strength can be obtained through subsequent processing techniques (cold hardening, heat treatment, etc.).
(2) High elastic limit, tensile strength and fatigue strength ensure the normal operation of the bellows.
(3) Good welding performance, meeting the welding process requirements of bellows during the production process.
(4) Good corrosion resistance, able to meet working requirements in different environments.
