Master Plumber Practice Exam

Question: 1 / 400

The minimum common horizontal waste pipe serving a bathtub, a lavatory, and a kitchen sink shall be at least what?

A 3 inches

B 1 -1/2 inches

C 2 - 1/2 inches

D 2 inches

The minimum common horizontal waste pipe serving a bathtub, a lavatory, and a kitchen sink must be at least 2 inches in diameter to ensure proper drainage and to handle the volume of wastewater produced by these fixtures.

This size is determined based on plumbing codes and standards that consider the cumulative flow from multiple fixtures. A 2-inch diameter pipe provides adequate capacity to accommodate the simultaneous discharge of waste while reducing the risk of blockages and ensuring efficient flow. Smaller pipes may not handle the volume effectively, leading to potential clogs or slow drainage issues.

Understanding the hydraulic principles involved in plumbing systems helps clarify the need for a sufficient pipe diameter to meet the drainage requirements of various fixtures collectively. This ensures that the plumbing system functions optimally while adhering to safety and regulatory standards.

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