What is the pressure at the base of a 60-foot-high cylinder if pressure increases by 0.434 PSIG per foot?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

What is the pressure at the base of a 60-foot-high cylinder if pressure increases by 0.434 PSIG per foot?

Explanation:
Hydrostatic pressure in a liquid column increases with depth at a constant rate. For water, that rate is about 0.433–0.434 psi per foot. If the top of the 60-foot-high cylinder is open to the atmosphere, the gauge pressure at the base equals the depth times that rate: 60 ft × 0.434 psi/ft ≈ 26.04 psi. So the base pressure is about 26 psi gauge. This matches the given data: a 60-foot height with a 0.434 psi/ft increase results in roughly 26 psi. The other options would require different heights (e.g., 60 psi would need ~138 ft; 32 psi ~74 ft; 12 psi ~28 ft), which don’t fit the 60-foot height.

Hydrostatic pressure in a liquid column increases with depth at a constant rate. For water, that rate is about 0.433–0.434 psi per foot. If the top of the 60-foot-high cylinder is open to the atmosphere, the gauge pressure at the base equals the depth times that rate: 60 ft × 0.434 psi/ft ≈ 26.04 psi. So the base pressure is about 26 psi gauge.

This matches the given data: a 60-foot height with a 0.434 psi/ft increase results in roughly 26 psi. The other options would require different heights (e.g., 60 psi would need ~138 ft; 32 psi ~74 ft; 12 psi ~28 ft), which don’t fit the 60-foot height.

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