Difficulty: Medium

Average Score: 50%

When may one bathtub and one laundry sink be installed on a 1 1/2-inch horizontal waste branch without re-venting

Rationale

When the most remote fixture is within a developed length of 3 feet 6 inches from a main vented line.

The plumbing code allows for one bathtub and one laundry sink to be connected to a 1 1/2-inch horizontal waste branch without the need for re-venting, provided that the most remote fixture is no more than 3 feet 6 inches from the main vented line. This distance ensures proper drainage and ventilation, minimizing the risk of trap siphoning and maintaining effective waste flow.

A (When the most remote fixture is within a developed length of 3 feet 6 inches from a main vented line) CORRECT

This choice correctly identifies the maximum distance for the installation of a bathtub and laundry sink on a 1 1/2-inch horizontal waste branch without requiring additional venting. Adhering to this guideline ensures compliance with plumbing regulations regarding fixture venting and drainage.

B (When the most remote fixture is within a developed length of 5 feet from a main vented line) YOUR ANSWER

This option exceeds the allowable distance specified in the plumbing code for connecting a bathtub and laundry sink to a 1 1/2-inch horizontal waste branch without re-venting. A distance of 5 feet may lead to insufficient venting, increasing the risk of drainage issues and inefficient waste removal.

C (When the most remote fixture is within a developed length of 6 feet from a main vented line) YOUR ANSWER

Similar to choice B, this distance also surpasses the maximum allowable length for proper installation on a 1 1/2-inch horizontal waste branch. Venting beyond 3 feet 6 inches would compromise the system's effectiveness, potentially causing malfunction and compliance violations.

D (They cannot be installed there. The horizontal branch is too small) YOUR ANSWER

While the horizontal branch size is relevant, the regulation specifically allows for the installation of both fixtures on a 1 1/2-inch branch as long as the distance to the main vented line does not exceed 3 feet 6 inches. Therefore, this statement is incorrect because the branch size alone does not prohibit installation under the specified conditions.

Conclusion

The plumbing code permits the installation of one bathtub and one laundry sink on a 1 1/2-inch horizontal waste branch without re-venting if the most remote fixture is within a developed length of 3 feet 6 inches from the main vented line. This regulation is crucial for ensuring efficient drainage and proper ventilation in plumbing systems. Options B, C, and D fail to adhere to the requirements set forth in the code, highlighting the importance of understanding these distance limitations for successful plumbing installations.

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