High-Velocity Water Flushing

What is High-Velocity Water Flushing?

High-velocity water flushing circulates water within a system to create a turbulent flow. This turbulent flow then removes debris and contaminants from the system.

A form of chemical treatment may be incorporated into this process if necessary. For example, before performing high-velocity water flushing on a cooling water system, any algae that had formed would need to be neutralized through passivation or another form of chemical treatment.

Why is High-Velocity Water Flushing Important?

If debris or contaminants stay in your facility’s mission-critical cooling systems, feedwater systems or condensate systems prior to commissioning, these materials could lead to fouling, corrosion and even total system failure, resulting in costly repairs and downtime.

High-velocity water flushing ensures these systems are cleaned effectively, extending the life of your mission-critical components and keeping your facility operating at peak efficiency.

The B&W High-Velocity Water Flushing Difference

• We calculate flow rates, determine heat loads and take other critical factors into account during the design phase as we’re creating your custom cleaning program  
• Our in-house engineering team’s extensive chemistry background allows us to answer questions like, “Do we need any treatment or demineralized water?” and incorporate any necessary additions into your cleaning package
• We show up with modular equipment skids containing all the equipment we need to perform high-velocity water flushing on your systems—not just a truck and a pump

How B&W Performs High-Velocity Water Flushing

Our team designs and executes custom high-velocity water flushing programs through an extensive five-step process.

Step 1: Evaluate

Every high-velocity water flushing project begins with a detailed assessment of your system. Our engineers evaluate your system’s size, piping configuration, construction materials and total volume to determine pump capacity, the number of pumps needed and required flow rates.

We account for material limitations, such as heat-sensitive PVC, to determine whether heat exchangers are needed to control temperature during the flushing process. Our team also identifies contamination types and determines whether chemical treatment is required, which is especially important for cooling water system flushing, where biological growth may need to be neutralized before flushing.

Step 2: Plan

B&W develops a custom flushing procedure based on system documentation, including P&IDs, isometrics, vendor data and client specifications. This ensures the final plan aligns with operational and commissioning requirements.

Each closed-loop water flushing or pre-commissioning water flushing plan defines flow paths, filtration strategy and cleanliness criteria, creating a clear roadmap before we ever start flushing.

Step 3: Model

Using incompressible fluid modeling, our team calculates the flow rates and velocities required to achieve the turbulent conditions critical for effective high-velocity water flushing.

These calculations guide equipment sizing, including pumps, filtration units and heat exchangers, ensuring the system achieves the proper velocity to remove debris without causing any damage. This step is especially important in a chilled water system flushing procedure, where precise flow control is essential.

Step 4: Execute

B&W mobilizes our modular equipment skids equipped with high-flow pumps and filtration systems, allowing for efficient setup and controlled field execution.

Water is circulated at calculated velocities to create turbulence that dislodges and transports debris. Unlike high-pressure methods, high-velocity water flushing relies on sustained flow to move contaminants into filter pots for removal. Treatment can be incorporated as needed, depending on the system and fouling type.

Step 5: Verify

Our team verifies cleanliness through filtration inspection and membrane testing, since water samples alone don’t reliably capture particulate contamination.

We flush until your system meets client-defined specs, ensuring your cooling water system flushing or pre-commissioning water flushing is complete, and your equipment is ready for safe, reliable operation.

Give us a call to see how our high-velocity water flushing services can protect your mission-critical cooling systems. Not sure if this application is right for your system? Compare high-velocity water flushing to a few of our other offerings below.

Which Pre-Commissioning Cleaning Service Is Right For Your System?