Prior to commissioning any watermain, a series of tests are essential to guarantee its structural integrity, functionality, and the quality of water it will deliver. The first step is swabbing, a process designed to remove debris and dirt that may have accumulated within the pipeline during construction. This is typically performed on pipes with diameters less than 600mm, as larger pipes can be internally inspected for cleanliness.
Following the swabbing, a hydrostatic pressure test is conducted. This test involves filling the pipeline with water and applying pressure exceeding the normal operating pressure. This assesses the pipeline’s strength and identifies any potential leaks. Pressure is maintained for a specified duration, and any pressure loss or visible leaks indicate issues that need to be addressed before the pipeline is put into service.
Once the hydrostatic pressure test is successfully completed, a water sterilization test is performed. Water samples are collected from various points within the pipeline and analyzed for parameters such as color, turbidity, odor, pH value, and conductivity. These results are compared against the quality of water sourced from the supply point. This step is crucial to ensure that the water delivered through the pipeline meets the required standards for consumption and use.
By meticulously following this testing protocol, authorities can confidently commission watermains that are structurally sound, leak-free, and capable of delivering safe and high-quality water to consumers. These tests serve as a final quality assurance measure, guaranteeing the reliability and performance of the water supply infrastructure.