What is the maximum spacing for hangers using 1 ¾" lag screws for 6 in. Sch. 40 pipe?

The maximum spacing for hangers using 1 ¾" lag screws for 6-inch Schedule 40 pipe is 10 feet. This specification is aligned with industry standards for supporting pipe to ensure safety and reliability in water-based systems. Proper spacing is critical for maintaining the integrity of the piping, preventing sagging, and accommodating thermal expansion or contraction.

The spacing is determined based on several factors, including the diameter of the pipe, the weight of the contents within it, and the type of hanger being used. In this case, 6-inch Schedule 40 pipe is relatively heavy, and the use of 1 ¾" lag screws as hangers allows for a secure and stable installation when spaced properly. The 10-foot spacing is therefore established as optimal to balance support and accessibility while ensuring that the pipe is adequately supported throughout its length.

Options that suggest greater spacing do not take into account these structural and safety considerations, which can lead to potential failure of the support system. Therefore, the correct answer of 10 feet is rooted in best practices for plumbing and pipe installation standards.