Why Use Corrugated Stainless Hose?
Corrugated stainless steel hose can accommodate movement, installation tolerance, vibration, and thermal expansion between rigid cooling hardware. It is not automatically the best option: corrugation, braid, end fittings, bend radius, pressure, flow, and service cycles must suit the application.
Construction and Materials
| Element | Selection question |
|---|---|
| Corrugated tube | Does alloy, wall, corrugation, and forming route suit coolant, pressure, temperature, and fatigue? |
| Braid or reinforcement | Does it control pressure thrust while preserving the required flexibility and bend radius? |
| End fittings | Are UQD/NVQD, threaded, flanged, brazed, or welded ends compatible with the mating system? |
| Seals and gaskets | Do materials, compression, temperature, coolant, and assembly torque match the interface? |
Routing, Bend Radius, and Side Load
Hoses should bend in the intended plane and remain within the supplier's minimum static and dynamic radius. Twisting, over-bending, unsupported weight, sharp edges, and side loads at the connector can shorten life or create leakage.
- Use supports and clamps that guide without crushing or fretting the hose.
- Keep hose ends aligned so fittings are not used to force a misaligned assembly.
- Provide access for installation, inspection, replacement, and leak localization.
- Account for pressure thrust and movement during pump start, shutdown, and thermal change.
Pressure, Flow, and Fatigue
Pressure rating depends on tube, braid, temperature, fitting, assembly, and safety factor. Flow performance depends on nominal bore, corrugation, length, bends, connectors, and coolant properties. Fatigue life depends on vibration, cycles, amplitude, temperature, and routing.
Use supplier data and representative testing rather than applying a single generic pressure rating to every hose assembly.
End Fittings and Quick Disconnects
End fittings define the actual system interface. Check dimensions, sealing face, retention, insertion force, side load, connection cycles, drip control, pressure drop, and service access. UQD/NVQD terminology does not by itself prove interchangeability; confirm the exact part and mating component.
See the manifold and quick-disconnect guide.
Cleanliness and Corrosion
Hoses can retain forming lubricant, particles, braid fragments, moisture, or cleaning residue. Define flushing, passivation, drying, caps, storage, and particle limits. Stainless steel also requires review of chloride exposure, weld condition, crevice risk, coolant chemistry, and dissimilar-metal contact.
Inspection and Qualification
- Visual and dimensional inspection of tube, braid, fittings, and overall length
- Material certificates and weld or braze records where applicable
- Leak, proof-pressure, flow, and pressure-drop testing
- Bend, vibration, thermal-cycle, and connection-cycle testing when required
- Cleanliness, seal, torque, traceability, and packaging records
Corrugated Hose RFQ Checklist
- Hose length, installed envelope, movement, bend plane, and minimum radius
- Coolant, operating/proof pressure, temperature, flow, and fatigue cycles
- Tube and braid materials, finish, passivation, and corrosion environment
- End fittings, UQD/NVQD part numbers, mating interfaces, seals, and torque
- Leak, flow, cleanliness, qualification, documentation, and packaging needs
For the complete system, review busbar and CDU integration and liquid cooling component machining.