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Process connection

Process connection type and selection

Process connection types and their selection can vary depending on the specific application and requirements. Here are some common types of process connections and considerations for selection:

Threaded Process Connection:

  •  Common sizes: 3/4″, 1″, 1 1/2″


  • 60° Cone Pipe Thread (NPT): This has a 60° angle and involves the mating of a conical internal thread with a conical external thread. When tightened, the thread itself provides sealing capabilities. Sealants like thread seal tape or sealant         compounds can be used to enhance sealing and prevent leakage of gases or liquids.   
  • 55° Cylindrical Pipe Thread (G Thread): This has a 55° angle and requires the use of a gasket on the sealing surface to achieve sealing. It is typically used in piping systems with pressures under 10KG.
  • Selection Considerations: The choice of threaded connections depends on factors like the media being transported, pressure ratings, temperature, and ease of installation and maintenance.

Flange Process Connection:

  • Main Features: Easy disassembly and assembly, high strength, good sealing performance, and the ability to withstand high pressures.
  • Types: Based on the way the flange is fixed to the pipe, it can be a threaded flange, welded flange, or a loose flange. Depending on the sealing surface, it can be a raised face (RF), male and female face (MFM), tongue and groove face (TG), or ring  joint face (RJ).
  • Selection Considerations: The choice of flange connections depends on factors like the required sealing performance, pressure and temperature ratings, the type of media, and the ease of installation and maintenance. In some cases, large-                 diameter flanges with larger through-holes may be preferred to improve measurement accuracy, increase probe rod strength, and enhance compatibility with different equipment.

Other Considerations:

  • Non-standard flanges, designed with smaller or thinner dimensions to save material and reduce costs, can pose risks in high-temperature and high-pressure environments. Therefore, it is important to select flanges based on the actual operating      conditions.
  • The choice of gaskets for flange connections should also be made according to design specifications and the operating conditions.

In summary, the selection of process connections depends on a variety of factors, including the specific application requirements, media properties, pressure and temperature ratings, and ease of installation and maintenance. It is important to carefully consider these factors to ensure the reliability and safety of the overall system.