What bed material is specified for laying distribution pipes?

What bed material is specified for laying distribution pipes?

• A. Sand
• B. Concrete
• C. Gravel or Crushed Stone
• D. Soil

Answer: (C)

The material you place as a bed under distribution pipes should provide stable, even support and allow drainage. Gravel or crushed stone fits this role well because it is coarse and granular, which distributes loads along the pipe length, resists shifting and void formation, and lets water drain away from the pipe. This helps prevent pipe movement, settling, or deformation during backfill and service. Sand can compact or wash away in some conditions, leading to settlement or misalignment. Soil (unprocessed earth) can easily settle and shift, offering inconsistent support. Concrete would create a rigid base that can crack or transfer stresses unevenly to the pipe. So, gravel or crushed stone is the preferred bed material for laying distribution pipes.

The material you place as a bed under distribution pipes should provide stable, even support and allow drainage. Gravel or crushed stone fits this role well because it is coarse and granular, which distributes loads along the pipe length, resists shifting and void formation, and lets water drain away from the pipe. This helps prevent pipe movement, settling, or deformation during backfill and service.

Sand can compact or wash away in some conditions, leading to settlement or misalignment. Soil (unprocessed earth) can easily settle and shift, offering inconsistent support. Concrete would create a rigid base that can crack or transfer stresses unevenly to the pipe. So, gravel or crushed stone is the preferred bed material for laying distribution pipes.