Question 67

The maximum unsupported length between the end sprinkler and the last hanger for 1 1/2-inch pipe is 36 inches.

The maximum unsupported length allowed for 1 1/2-inch pipe is 36 inches, meaning that any span beyond this distance without proper support may lead to structural concerns and potential pipe failure.

A) 36 inches

This option is correct because it aligns with standard plumbing codes that specify the maximum unsupported length for 1 1/2-inch pipe. Adhering to this measurement ensures the pipe remains stable and functions effectively without risk of sagging or damage.

B) 48 inches

This option is incorrect as it exceeds the allowable unsupported length for 1 1/2-inch pipe. Using a span of 48 inches would not comply with the recommended guidelines, increasing the risk of pipe failure due to inadequate support.

C) 60 inches

This option is also incorrect because it significantly surpasses the maximum unsupported length for 1 1/2-inch pipe. Allowing a span of 60 inches without supporting hangers would lead to potential sagging and structural issues, violating established plumbing standards.

D) 72 inches

This option is incorrect as it greatly exceeds the maximum unsupported length for 1 1/2-inch pipe. A 72-inch span would pose serious risks to the integrity of the piping system, making it essential to adhere to the 36-inch limit for safety and compliance.

Conclusion

The correct answer is 36 inches, as it is the standard maximum unsupported length for 1 1/2-inch pipe, ensuring safety and structural integrity. All other options fail to meet this requirement, potentially leading to plumbing issues and non-compliance with industry standards.