Dynamic Flushing

The photos show the debris we captured during the pre-commissioning flushing of a purified water system. (3” pipework, 35m3/hr flow-rate, 50 micron strainer).

Many extraneous materials can inadvertently find their way into systems during the manufacture, storage and installation of pipes and components. Typically, this is metallic debris (dust, swarf, etc.) introduced during cutting and welding processes, but could be almost anything else (leaves, stones, PPE such as ear-plugs, etc.). Dissimilar metals can be an issue, particularly if the installation is taking place within in a construction site, e.g., airborne carbon steel dust from grinding activities can settle onto stainless steel equipment that is insufficiently covered – and will be largely undetectable until the plant is operational / wetted.

No matter how clean the fabrication and installation process is, it is almost inevitable that some of this debris will find its way in. A dynamic “flush” is essential in order to remove any materials that could inhibit the operational function of the plant and/or lead to corrosion further down the line.

The level of cleanliness achieved by the flush is very much determined by the water velocity and the flow-path utilised. In some cases, the system design will not be conducive to an effective flush - dead-legs, pipe-reducers, in-line equipment, multiple branches, etc. will all hamper the removal of debris. In these cases, temporary equipment will be required. For example, hoses to create more effective flow-paths and pumps to achieve the velocities needed for each respective pipe diameter.

INOX Passivation staff have extensive experience in this process and have completed Pre-Commissioning Cleaning of Pipework training with BSRIA. We have a range of pumps, fittings and hoses enabling us to flush your pipework systems to whatever level of cleanliness you require.