Answer: C. Longitudinal temperature stress
A pressure conduit laid underground may not be subjected to longitudinal temperature stress.
A pressure conduit is just a pipe which runs under pressure. As the conduits generally follow shorter routes, it is more economical than canals. Hence, a pressure conduit laid underground may not be subjected to longitudinal temperature stress.
Pressure pipes must be designed to withstand the following forces :
(1) Internal pressure of water
(2) Pressure due to external load (when buried under the ground).
(3) Temperature stresses (when laid above the ground).
(4) Longitudinal stresses due to flow around bends or change in cross-section.
(5) Bending stresses (when laid over support at interval or on bridges)
Here, the correct option is C.
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