Tapping tees and crosses must be of sufficient length to provide support to the pipe being tapped to prevent what issue?

Tapping tees and crosses are fittings used to create a branch off of a main pipeline, typically in water distribution systems. These fittings must be of sufficient length to adequately support the pipe being tapped. Proper support is crucial because inadequate length can lead to excessive stress on the joint where the tap is made. If the joint is not adequately supported, it may lead to misalignment or movement that can compromise the integrity of the connection, ultimately resulting in leakage.

Leakage can pose significant issues within water distribution systems, including water loss, pressure drops, and potential contamination of the water supply due to ingress of external substances. By ensuring that tapping tees and crosses are long enough to provide stable support, these leaks can be effectively minimized, maintaining the system's safety and efficiency.

In contrast, while issues such as corrosion, blockage, and contamination can be pertinent in water systems, they are not directly caused by the insufficient length of tapping tees and crosses, making leakage the most relevant concern in this context.