What is typically advised when working near existing pipework that may need flushing?

When working near existing pipework that may need flushing, it is typically advised to open the tap nearest to the work location first. This procedure is important because it helps to relieve any pressure that may have built up in the system and allows for an easier and safer flushing of the pipes. By opening the nearest tap, any trapped air can be released, and it also helps to ensure that water can flow freely during the flushing process. This reduces the risk of creating a water hammer effect or causing damage to the existing plumbing when the water is turned back on.

In contrast, closing all valves before starting work could prevent water flow altogether, leading to issues when trying to flush the pipes. Notifying local authorities may be necessary in certain situations, but it is not a standard practice specifically related to working near pipework. Running the system at high pressure could lead to increased stress on the pipes, risking leaks or burst pipes, and is generally not advisable during maintenance work. Therefore, starting with the nearest tap ensures a smooth flushing operation and prioritizes safety and system integrity.