What Is Coolant Inventory?_
Coolant Inventory refers to the specific fluid—its chemistry, volume, and concentration—that circulates through cold plates, manifolds, and CDUs to remove heat from GPU nodes. It must be tracked per rack or row to ensure proper thermal performance and leak detection thresholds. The inventory includes both the primary loop fluid and any reserve stored on-site for top-offs during maintenance.
Technical Details
Coolant type is selected based on the OEM’s spec for the cold-plate materials (e.g., nickel-plated copper) and pump compatibility; common options are deionized water with corrosion inhibitors or a water-based coolant like propylene-glycol mixtures (note: these are not typically dielectric). The total volume per NVL72 rack is determined by the loop length, number of GPU trays, and CDU reservoir capacity. Field crews verify inventory by reading sight glasses or electronic level sensors during commissioning, and they log the batch number and date for fluid life-cycle tracking. Any change in coolant conductivity or pH outside the OEM’s range triggers a full replacement procedure.
How Leviathan Systems Works with Coolant Inventory
During rack assembly, we fill the coolant loop using a dedicated cart with a calibrated flow meter, then record the initial inventory in the site’s asset management system. Later, during commissioning, we check for air pockets and confirm the inventory matches the design volume before powering the CDU.
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