Difference between steel expansion joint and seismic joint

Difference between steel expansion joint and seismic joint
Steel expansion joints and seismic joints are both used in piping systems to compensate for thermal expansion and contraction, but they serve different purposes and have different design requirements.
Steel expansion joints are used to absorb thermal expansion and contraction in piping systems. They are made of metal bellows that can flex and compress as the temperature changes. Steel expansion joints are typically used in systems that operate at high temperatures or pressures, such as power plants, refineries, and chemical plants. They are designed to withstand the stresses of thermal expansion and contraction, as well as the pressure and flow of the fluid in the system.
Seismic joints, on the other hand, are used to absorb the movement and vibration caused by earthquakes or other seismic events. They are designed to allow the piping system to move and flex without breaking or damaging the system. Seismic joints are typically made of rubber or other flexible materials that can absorb the energy of the seismic event. They are used in buildings, bridges, and other structures that are located in earthquake-prone areas.
The design requirements for steel expansion joints and seismic joints are different because they are subjected to different types of stresses. Steel expansion joints must be able to withstand the pressure and flow of the fluid in the system, as well as the stresses of thermal expansion and contraction. They must be designed to prevent leaks and maintain the integrity of the piping system. Seismic joints, on the other hand, must be able to absorb the energy of a seismic event without breaking or damaging the piping system. They must be designed to allow the system to move and flex without causing damage to the structure or the piping system.
In summary, steel expansion joints and seismic joints are both important components of piping systems, but they serve different purposes and have different design requirements. Steel expansion joints are used to compensate for thermal expansion and contraction, while seismic joints are used to absorb the movement and vibration caused by seismic events. The design requirements for each type of joint are different, and they must be selected and installed correctly to ensure the safety and reliability of the piping system.