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This siphon effect relies on atmospheric pressure to allow the pressure and pressure potential energy to drop as the water travels upward inside the sealed pipe. But eventually the pressure of the rising water reaches zero and no further reductions in pressure and pressure potential energy are possible.
Surprisingly, ice forming in a pipe does not typically cause a. break where the ice blockage occurs. Itâs not the radial expan-. sion of ice against the wall of the pipe that causes the break. Rather, following a complete ice blockage in a pipe, continued. freezing and expansion inside the pipe causes water pressure. to increase downstream -- between the ice blockage and a. closed faucet at the end. Itâs this increase in water pressure that. leads to pipe failure.