Manifold

Basic Information
● Main material: 316L stainless steel
● Process: Vacuum brazing, with brazing alloys typically based on nickel or copper.
● Internal surface treatment: Electrolytic polishing

Interface Specifications
● Main inlet/outlet port: typically G3/4" or G1" internal thread, for connection to the main circulation piping.
● Branch ports (to GPU/CPU cold plates): Typically G1/4" or G3/8" internal threads (or tapered sealing interfaces), connected to corrugated or rigid tubing. An HGX platform manifold for an 8-GPU system will have 16 branch ports (8 inlets and 8 outlets).

Size
● Customization options: Customized according to customer requirements; typical lengths range from 10 cm to 300 cm.

Hydraulic Performance Parameters
● Total flow rate: 8–16 LPM
● Flow distribution uniformity: one of the most critical parameters. Typically, the flow deviation across all branches (i.e., each GPU cold plate) is required to be < ±5%.
● Inlet–outlet pressure drop: At the rated total flow rate (e.g., 12 LPM), the pressure drop across the manifold itself is typically required to be less than 20 kPa. The lower this value, the lower the requirements for the system pump and the lower the energy consumption.

Pressure and Leakage
● Working pressure: 0.5–1.0 MPa
● Burst pressure: 3 MPa
● Leakage rate: External leaks are detected using helium mass spectrometry, with a typical requirement of < 1×10⁻⁶ mbar·L/s.

Testing and Compatibility
● Pressure cycling test: greater than 5,000 cycles or 8,000 cycles
● Thermal shock testing: Rapid cycling between high-temperature coolant (e.g., 70°C) and low-temperature coolant (e.g., 20°C)
● Coolant compatibility: deionized water, ethylene glycol aqueous solutions, fluorinated fluids, etc.

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Water distributor