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Reliable research: The reliability of the compensator consists of the design, manufacturing, installation and operation management. Reliability should also be considered in these several aspects. Material selection for heating pipe network bellows material selection, in addition to the working medium, working temperature and external environment, should also consider the possibility of stress corrosion, water treatment agent and pipe cleaning agent on material, and based on the welding, forming and material performance price ratio, preferred economical and practical bellows production material.
In general, the materials for selecting bellows shall meet the following conditions:
(1) High elasticity limit, tensile strength and fatigue strength to ensure the normal operation of the bellows.
(2) Good plasticity, easy for the processing of the bellows, and can be obtained through the subsequent treatment process (cold hardening, heat treatment, etc.) The hardness and strength of the.
(3) Good corrosion resistance, to meet the working requirements of bellows in different environments.
(4) Good welding performance to meet the welding process requirements in the production process.
For the heat pipe network laid in the trench, when the Rubber Compensator is low-lying, rainwater or accident sewage will soak the bellows, and stronger corrosion resistance materials, such as iron-nickel alloy, high-nickel alloy, should be considered. Due to the high price of such materials, consider adding a layer of corrosion-resistant alloy only to the surface in contact with corrosive media.
Fatigue test: Fatigue life design can be seen from the failure type and cause analysis of the bellows compensator, the plane stability, circumferential stability and corrosion resistance of the bellows are all related to its displacement amount, namely the fatigue life. Too low fatigue life will lead to bellows stability and corrosion resistance to decline. According to the test and use experience, the bellows fatigue life used for heating works shall not be less than 1,000 times.
The bellows cannot be load-bearing and shall be lifted separately; except for the bellows deformation method, it shall not allow welding slag to splash on the bellows surface and suffer other mechanical damage; all moving elements of the bellows shall not be stuck by external components or restrict the normal operation of the active parts.
Most failures of the bellows are caused by external environmental corrosion, thus considering the structural design of the Pipe Compensator. Such as for the outer peripheral compensator can be added between the outlet end ring and the outlet pipe, its role is equivalent to the sleeve compensator, can resist the invasion of external corrosion medium, and add a safety barrier to the bellows PTFE Compensator, even if the bellows damage, the compensator can also play a compensatory role and avoid the bellows failure.compensator has metal compensator and non-metal compensator, according to the different use of media, can also be divided into professional anticorrosion Pipe Compensator and high temperature resistance compensator.
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July 25, 2022
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