How frequently should PB pipe be supported when installed horizontally?

• A. 24 inches
• B. 28 inches
• C. 32 inches
• D. 36 inches

Answer: (C)

The correct answer, indicating that PB pipe should be supported every 32 inches when installed horizontally, is based on industry standards and plumbing codes designed to ensure durability and integrity of the piping system.

PB (Polybutylene) pipes are flexible and lightweight, which can make them more prone to sagging or bending under their own weight if not adequately supported. The recommended support spacing of 32 inches helps maintain the structural integrity of the pipe, prevents potential stresses that could lead to leaks or failures, and facilitates easier installation and maintenance. This guideline takes into consideration the temperature changes that could cause the material to expand and contract, as well as ensuring that the weight of the water contained within the pipe is properly supported.

Adequate support ensures that the plumbing system functions optimally over time, minimizing issues that can arise from improper installation.