Which gasket type is typically used on flange valves in High-Pressure/High-Temperature lines?

Which gasket type is typically used on flange valves in High-Pressure/High-Temperature lines?

• A. Low pressure lines
• B. High-Pressure/High-Temperature lines
• C. Cryogenic lines
• D. Vacuum lines

Answer: (B)

High-pressure, high-temperature service needs gaskets that won’t relax, creep, or deform under extreme conditions. Soft, non-metallic gaskets can soften, creep, or extrude when temperatures and pressures rise, leading to leaks. Metal gaskets—such as ring-joint types or spiral-wound gaskets—provide a tight metal-to-metal seal and withstand the heat and pressure seen in HP/HT lines. That’s why this scenario is associated with gaskets designed for those harsh conditions. The other line environments involve different demands (lower pressures, cryogenic temps, or vacuum needs) and are typically sealed with gaskets suited to those specific conditions.

High-pressure, high-temperature service needs gaskets that won’t relax, creep, or deform under extreme conditions. Soft, non-metallic gaskets can soften, creep, or extrude when temperatures and pressures rise, leading to leaks. Metal gaskets—such as ring-joint types or spiral-wound gaskets—provide a tight metal-to-metal seal and withstand the heat and pressure seen in HP/HT lines. That’s why this scenario is associated with gaskets designed for those harsh conditions. The other line environments involve different demands (lower pressures, cryogenic temps, or vacuum needs) and are typically sealed with gaskets suited to those specific conditions.