What is the controlled outlet in a pipeline used to discharge or drain water called?

The controlled outlet in a pipeline specifically designed to discharge or drain water is referred to as a blow-off. This mechanism allows for the efficient removal of water, sediments, or other materials accumulated within the pipeline, ensuring optimal flow and preventing blockages. Blow-offs are strategically installed at lower points in the system where drainage is needed and play a critical role in maintaining the integrity and function of the pipeline.

In contrast, a dead end typically refers to a section of a pipeline that does not continue, which can lead to stagnation and potential issues with water quality. A clean-out is a different feature, intended for maintenance access to remove blockages; while it may be used in a drainage context, it is not specifically designed solely to discharge or drain water like a blow-off. Therefore, the blow-off stands out as the correct term for the controlled outlet function within a pipeline system.