What Is Coolant Loop Pressure Test?_
This test pressurizes the coolant loop (typically with deionized water, a dielectric fluid, or inert gas) to a level above normal operating pressure, then monitors for any drop over a set period. A stable pressure indicates the loop is sealed and ready for GPU operation. It is a standard step in commissioning liquid-cooled racks to prevent coolant leaks that could damage hardware.
Technical Details
The test pressure is set per the OEM spec, typically a multiple of the maximum operating pressure, and held for a duration like 15–30 minutes. A pressure gauge or digital sensor records the initial and final readings; a drop beyond the allowable tolerance (per OEM specification) indicates a leak. For wet tests, the loop must be fully filled and bled of air before testing to avoid false pressure changes. A dry pressure test with inert gas is also common prior to filling. After a pass, the system is depressurized and connected to the facility's coolant distribution unit.
How Leviathan Systems Works with Coolant Loop Pressure Test
Our field crew performs this test on every GPU rack after assembling the liquid cooling manifold and tubing, before powering the rack. It is a go/no-go gate: a failed test means we must inspect all fittings and retest.
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