External pressure axial expansion joints have been widely used in many industries because of their unique structural design and performance characteristics. It is mainly used to absorb axial displacements in piping systems due to temperature changes, while being able to withstand pressure from external media. The following are its main application areas and specific scope of use:
1. Power industry
Steam delivery pipeline: It is used in high temperature and high pressure environments such as main steam pipeline and reheating steam pipeline in power plants to compensate for pipeline expansion and contraction caused by temperature difference.
Air cooler (air cooling island) connection pipe: Flexible joints for connecting air-cooled equipment and main steam ducts in generator sets with air-cooled technology.
2. Petrochemical industry
oil refining unit: It is applied to the pipeline system in high temperature and high pressure processes such as crude oil distillation tower and catalytic cracking unit to ensure safe and stable operation.
Chemical reactor: Used to connect the pipeline between the reactor and other equipment, compensate for length changes due to temperature fluctuations, and prevent stress concentration from damaging the equipment.
3. Metallurgical industry
Blast furnace gas pipeline: It is used for the transportation of blast furnace gas in iron and steel plant, which can adapt to large temperature changes while ensuring sealing performance.
Heating furnace inlet and outlet pipe: Connect the heating furnace with other equipment, such as rolling mill, etc., to compensate for thermal expansion and contraction during heating.
4. Heating system
Urban central heating pipe network: Widely used in hot water or steam delivery pipes of urban central heating systems to compensate for pipe expansion and contraction caused by seasonal temperature changes.
Internal pipeline of district heating station: Used for the connection between various equipment inside the heating station to ensure the proper operation of the system.
5. Oil and gas field development
Gathering pipeline: Used for crude oil and natural gas collection and transportation pipeline in the process of oil field exploitation, coping with complex and changeable working environment.
Submarine pipeline terminal: Serves a critical compensatory role at the subsea pipeline connection between the offshore oil platform and the land receiving terminal.
6. HVAC (HVAC)
Refrigeration/Heating Pipes in Large Buildings: Used in complex refrigeration and heating piping systems inside buildings to compensate for displacements due to temperature changes, ensuring efficient system operation.
Central air conditioning unit connecting pipe: Connect pipes between central air conditioning units and other end equipment to reduce vibration transmission and improve system stability.
7. Other industrial applications
Paper industry: Used in high temperature and high pressure steam pipeline in pulp production line to ensure production continuity and safety.
Food processing industry: Applied to steam and hot water delivery pipelines in food processing plants, meeting strict hygiene standards.
Pharmaceutical industry: For the delivery pipeline of special media such as pure steam and water for injection in pharmaceutical factories, ensure no leakage and meet GMP specifications.
Special Application Scenario
Wet flue gas desulfurization system: Considering the presence of weak acid water, you can choose a specially designed fully sealed expansion joint, or set a waterproof layer inside the expansion joint to protect the inner fabric from corrosion.
Low temperature environment: For extremely cold areas or under conditions requiring low temperature operation For use, materials with good low-temperature toughness should be selected, and appropriate heat preservation measures should be taken.
Summary of scope of use
External pressure axial type expansion joints are suitable for piping systems in a variety of industries, especially where significant temperature changes, external pressure, or mechanical stresses exist. They can not only effectively compensate the thermal expansion and contraction of pipes, but also provide good sealing and corrosion resistance, ensuring the safe and reliable operation of the whole system. According to specific working conditions (such as temperature, pressure, medium characteristics), external pressure axial expansion joints with different specifications and materials can be customized to meet specific needs.