What factor primarily determines the selection of a type of steam trap?

The selection of a steam trap is primarily influenced by the quality of the steam and condensate return. This factor is critical because the efficiency and effectiveness of steam traps depend greatly on their ability to handle the specific characteristics of the steam and condensate in the system.

Maintaining the right steam quality ensures that the traps can perform optimally, as traps are designed to separate steam from condensate. If the quality of steam is poor (e.g., containing a high level of non-condensable gases or moisture), it can impede the trap's operation, leading to inefficiencies or potential failures. Similarly, the characteristics of condensate return, such as temperature and pressure, play a key role in selecting the appropriate trap type to ensure proper drainage and to prevent flooding within the system.

While other factors like steam temperature, pressure of the steam system, and cost of installation are all relevant considerations in the overall steam system design, they are secondary to the importance of compatibility with the steam and condensate quality. Thus, for optimal performance and longevity of the steam trap, analyzing the quality of the steam and returning condensate is essential.