What is an essential characteristic of fittings used in systems above 350 PSI?

High strength and durability are essential characteristics of fittings used in systems operating above 350 PSI due to the significant mechanical stresses these fittings must withstand. In high-pressure systems, the fittings are subjected to not only the internal pressure but also potential thermal expansion, vibration, and other forces that can lead to failure if the materials are not sufficiently robust.

Heavy-duty materials, such as high-strength steel or high-quality alloys, are commonly utilized in these applications to ensure that the fittings can maintain their integrity and prevent leaks or catastrophic failures. This requirement for strength and durability helps ensure the safety and reliability of the system under high-pressure conditions.

While lightweight materials may be desirable in some applications to reduce overall system weight, and corrosion resistance is important to prolong the life of fittings in environments where they may be exposed to moisture or aggressive chemicals, the primary concern in high-pressure systems is ensuring that the fittings can safely handle the extreme pressures involved. Likewise, low thermal conductivity is less of a focus when rating fittings in a high-pressure context, as the strength and ability to withstand pressure take precedence over thermal properties.