What must be installed if the steam line length is significantly increased?

• A. Insulation
• B. Guard rail
• C. Pressure relief valve
• D. Expansion loop or joint

Answer: (D)

When a steam line becomes significantly longer, it will undergo greater thermal expansion and contraction. This movement can create large stresses in the pipe, supports, and connected equipment if not absorbed. An expansion loop or expansion joint provides the necessary flexibility to absorb that axial movement, keeping stresses within design limits and preventing damage. Insulation helps minimize heat loss and condensation but doesn’t accommodate movement. Guard rails are for protecting people or equipment, not for handling expansion. A pressure relief valve protects against overpressure, not against thermal-induced movement. So, the proper measure to handle a long steam run is an expansion loop or expansion joint.