What is the recommended method for clearing emergency stoppages in pipelines?

High velocity cleaners (HVC) are typically recommended for clearing emergency stoppages in pipelines because they utilize a powerful stream of water to effectively dislodge blockages. This method is efficient in removing significant buildups, debris, and other materials that may hinder the flow within the pipeline. HVC systems are designed to deliver a high-pressure water jet that can penetrate and clear blockages more effectively than many other methods.

In emergency situations, the speed and effectiveness of restoring flow are critical, and HVCs provide a rapid response to pipeline obstructions, minimizing downtime. This method also tends to be safer and cleaner compared to manual excavation, which may require digging around the pipeline and can be time-consuming and labor-intensive.

Using chemical solvents could pose risks to the environment and the integrity of the pipeline, as they might not always effectively clear blockages and could also result in hazardous conditions. Air jetting, while useful in certain contexts, may not provide the same level of effectiveness against tough blockages, making it less reliable for emergency situations compared to high velocity cleaners. Hence, HVCs are the preferred approach for quickly responding to and clearing emergency stoppages in pipelines.