Let’s get to know expansion joints.
Release time:
2021-05-25
As an elastic compensation component, expansion joints boast advantages such as reliable operation, excellent performance, and a compact structure. They are widely used in fundamental engineering fields including chemical industry, construction, water supply and drainage, petroleum, light and heavy industries, refrigeration, environmental sanitation, plumbing, fire protection, and power generation, playing an important role in people's daily lives.
Expansion joints, also known as compensators, are flexible structures installed on vessel shells or pipelines to absorb additional stresses caused by temperature differences and mechanical vibrations. Expansion joints are categorized into metallic expansion joints and non-metallic expansion joints.
Under the same external dimensions, the compensating capacity of non-metallic expansion joints is significantly greater than that of metallic expansion joints. In particular, for compensating lateral displacements, the compensating capability of non-metallic expansion joints is nearly one order of magnitude greater than that of metallic expansion joints.
Expansion joints, much like elastomers, generate resistance when they contract or stretch. The resistance of metal expansion joints is significantly greater than that of non-metal ones. This excessive resistance is detrimental to the system and can damage surrounding equipment.
The materials used in non-metallic expansion joints not only exhibit excellent high-temperature resistance but also possess acid and alkali resistance. The yield strength of ordinary carbon structural steel drops to zero at 600°C, and as the temperature rises further, the material tends to oxidize and form scale. Carbon steel expansion joints are prone to cracking during operation, whereas stainless steel expansion joints suffer from lower leakage and corrosion even in low-temperature environments—though their cost is considerably higher.
The structure of non-metallic expansion joints inherently possesses thermal insulation properties. However, metallic expansion joints do not have this feature. To provide thermal insulation, the outer layer of metallic expansion joints is covered with an insulating layer.
Non-metallic expansion joints require no maintenance throughout their normal service life; replacing non-metallic expansion joints is much easier than replacing metallic ones.
The service life of expansion joints is closely related to environmental conditions. Non-metallic expansion joints exhibit superior wear resistance and corrosion resistance. Under comparable conditions, non-metallic expansion joints generally have a longer service life than metallic expansion joints.
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A specialized enterprise dedicated to the design and manufacture of desulfurization damper doors, non-metallic expansion joints, bellows, expansion compensators, stainless steel flexible metal hoses, dust collectors, conveyors, compensators, silencers, dampers, and stainless steel flexible metal hoses, as well as metallic and non-metallic corrugated expansion joints (expansion compensators).
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