Question 67

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

For 1 1/2-inch pipe, the maximum unsupported length is 36 inches, which ensures that the pipe is adequately supported and minimizes potential sagging or damage.

A) 36 inches

This option is correct because building codes and guidelines specify that the maximum unsupported length for 1 1/2-inch pipe is indeed 36 inches. This limitation is crucial for maintaining the structural integrity of the piping system.

B) 48 inches

This option is incorrect as it exceeds the maximum unsupported length specified for 1 1/2-inch pipe. Allowing a length of 48 inches would increase the risk of the pipe sagging or bending under its weight, which could lead to potential system failures.

C) 60 inches

This option is also incorrect because it surpasses the allowable unsupported length for 1 1/2-inch pipe. A length of 60 inches would not provide sufficient support, leading to structural concerns and possible damage over time.

D) 72 inches

This option is incorrect as it significantly exceeds the maximum unsupported length for 1 1/2-inch pipe. A 72-inch unsupported span could result in severe sagging and compromise the effectiveness of the sprinkler system.

Conclusion

The correct answer is 36 inches, as it aligns with the regulatory standards for supporting 1 1/2-inch pipe. All other options fail because they exceed the maximum length, which poses risks to the integrity and functionality of the piping system. Adhering to the correct specifications is essential for safe and effective fire protection systems.