Under what condition might concrete encasement be required for steel pipelines?

• A. When specified by project requirements or soil conditions.
• B. Always required for underground pipelines.
• C. Never required if epoxy coating is present.
• D. Only required for above-ground pipelines.

Answer: (B)

Concrete encasement is used to protect a buried steel pipe from external loads, impacts, and aggressive soils, and its requirement is dictated by the project design or soil conditions. In practice, you encounter it when the project specifications or the soil analysis indicate that additional protection is needed—such as in areas with heavy traffic loads, unstable backfill, or corrosive soils—so the encasement is specified to ensure the pipe’s integrity over its service life. Epoxy coatings help with corrosion protection but do not replace the need for mechanical protection where there’s a risk of physical damage or high earth loads. So the condition under which encasement might be required is specifically when the project requirements or soil conditions call for it.