What type of steam trap is most susceptible to damage if allowed to come into contact with superheated steam?

Correct Answer: Option D — Thermostatic traps relying on the principle of expansion/contraction of a volatile fluid.

Thermostatic traps using volatile fluids are highly susceptible to damage from superheated steam. The high temperature causes the internal fluid to expand excessively, potentially rupturing the bellows or diaphragm. Unlike mechanical traps, these rely on precise temperature differentials that superheat can easily exceed, leading to permanent element failure.