What Is Cooling Loop Flushing?_
The process targets closed or semi-closed loops that serve GPU cold plates and rack manifolds. It typically uses successive passes of filtered or treated water followed by verification steps to confirm low conductivity and particle counts. Flushing occurs after mechanical assembly but before helium or pressure leak tests and final fluid charge.
Technical Details
Technicians connect temporary flush carts or portable pumps to dedicated fill and drain ports on the rack manifold. Flow direction is reversed at least once to dislodge debris from elbows and cold-plate micro-channels. Final rinse water is sampled for turbidity and resistivity; the loop is considered clean only when readings meet the coolant supplier threshold. All flush connections use the same push-pull quick-disconnect fittings as the production coolant lines.
How Leviathan Systems Works with Cooling Loop Flushing
Field crews perform loop flushing on every liquid-cooled rack row after cold-plate and manifold installation but before GPU insertion and network cabling on H100 and GB200 NVL72 deployments.
Related service
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