A plumber is designing a water distribution system for a multi-story building. To ensure adequate water pressure on upper floors, what is the primary consideration when selecting pipe materials and sizes?

Question: A plumber is designing a water distribution system for a multi-story building. To ensure adequate water pressure on upper floors, what is the primary consideration when selecting pipe materials and sizes?

Answer options:

• The aesthetic appearance of the exposed piping.
• The total static demand of all fixtures on each floor. ✅ Minimizing friction loss to maintain acceptable dynamic pressure.
• Ease of installation and cost of pipe material.

Correct answer: Minimizing friction loss to maintain acceptable dynamic pressure.

Explanation: Maintaining acceptable dynamic pressure on upper floors is crucial for occupant comfort and fixture function. This is achieved primarily by minimizing friction loss within the piping system, which is directly influenced by pipe size and material smoothness.