Horizontal breaks are typically caused by?

• A. Thermal expansion
• B. Pressure surges
• C. Corrosion
• D. Inadequate bedding or earth movement

Answer: (D)

Horizontal breaks are caused by the pipe not being properly supported and by movement in the surrounding ground. When the bedding is inadequate, loads aren’t distributed evenly, so soil settles or shifts and the pipe experiences bending stress. This bending concentrates stress along the pipe’s length and can crack the wall in a way that appears as a horizontal break. Proper bedding and accounting for earth movement help keep the pipe straight and reduce these stresses. Other factors like thermal expansion, pressure surges, or corrosion can damage pipes in different ways, such as causing bursts or leaks, but they don’t typically produce the characteristic horizontal break from bending caused by inadequate support or ground movement.