Refrigeration Plant Operator B Practice Test 2025 – All-in-One Guide to Exam Success

The type of pipe flange gasket often regarded as outdated is the graphite gasket. Graphite gaskets were once commonly used due to their high tolerance to temperature and pressure. However, advancements in materials and technology have led to the development of more effective gaskets that provide better sealing performance and durability under varying conditions.

While graphite gaskets can still be found in some applications, especially in high-temperature environments, they are not as widely utilized in modern piping systems. Other options like full face, ring joint, and flat ring gaskets have been enhanced and remain popular choices among engineers and operators for their reliability and efficiency in sealing flanges. These newer materials typically offer improved resilience, lower risk of leakage, and better compatibility with various fluids compared to graphite. Hence, among the choices, graphite is seen as the least favorable option in contemporary use.