In steam systems, the pigtail is used to protect components from exposure to which condition?

In steam systems, the pigtail is used to protect components from exposure to which condition?

• A. Condensation
• B. Vibration
• C. Absolute steam
• D. Overpressure

Answer: (C)

A pigtail provides a liquid barrier between the live steam line and a connected device, shielding it from the most extreme steam conditions. By routing a short loop of pipe into a U shape and letting condensate fill the loop, a column of water sits between the device and the hot steam. The pressure is transmitted through the liquid rather than through direct contact with dry, high-temperature steam, so sensitive components like gauges or control valves aren’t exposed to the full heat and dryness of the steam. This arrangement also helps dampen thermal shocks to the instrument. In short, the pigtail protects components from exposure to absolute steam (dry, high-temperature steam).

A pigtail provides a liquid barrier between the live steam line and a connected device, shielding it from the most extreme steam conditions. By routing a short loop of pipe into a U shape and letting condensate fill the loop, a column of water sits between the device and the hot steam. The pressure is transmitted through the liquid rather than through direct contact with dry, high-temperature steam, so sensitive components like gauges or control valves aren’t exposed to the full heat and dryness of the steam. This arrangement also helps dampen thermal shocks to the instrument. In short, the pigtail protects components from exposure to absolute steam (dry, high-temperature steam).