Cooling Water Passages: Passage Diameter 8-25 mm

Q: What is the main purpose of cooling water passages in a center housing?

To control and dissipate heat generated by internal components, preventing overheating, thermal deformation, and ensuring stable operation and longevity of the machinery.

Q: How are cooling passages typically manufactured?

They are often cast integrally during the housing's casting process using sand cores to form the internal channels. For complex designs or repairs, they may be drilled or machined post-casting.

Q: What are common issues with cooling water passages?

Blockages from scale or debris, corrosion, leaks at seals or connections, and inadequate flow due to pump failure or design flaws.

Component Specifications

Definition

Cooling water passages are precisely engineered internal channels integrated into the center housing of industrial machinery. Their primary function is to circulate coolant (typically water or water-glycol mixtures) to absorb and dissipate heat generated by internal components such as bearings, shafts, or process zones, thereby maintaining optimal operating temperatures, preventing thermal expansion, and ensuring dimensional stability and prolonged equipment lifespan.

Working Principle

Operates on forced convection heat transfer. Coolant is pumped through the network of passages, absorbing thermal energy from the housing walls via conduction. The heated coolant is then transported to an external heat exchanger (like a cooling tower or radiator) where it releases the heat to the environment before being recirculated, creating a continuous cooling cycle.

Materials

Typically cast or machined from the same material as the housing: Ductile iron (e.g., EN-GJS-400-18, ASTM A536), cast steel (e.g., ASTM A216 WCB), or aluminum alloys (e.g., A356, 6061) for lighter applications. Internal surfaces may be treated or coated (e.g., epoxy, nickel plating) for corrosion and scale resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Rate	10-50 L/min
Passage Diameter	8-25 mm
Operating Pressure	3-6 bar
Surface Roughness (Ra)	< 3.2 µm
Max Coolant Temperature	80°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1219, DIN 24342, ISO 13709 (API 610)

Parent Products

This component is used in the following industrial products

Center Housing

The central structural component of a turbocharger's CHRA that houses the rotating assembly and provides mounting interfaces.

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Engineering Analysis

Risks & Mitigation

Corrosion and scaling reducing heat transfer
Blockage leading to overheating
Leakage causing coolant loss and contamination
Cavitation damage from high flow velocities

FMEA Triads

Trigger: Poor water quality leading to mineral scale buildup.
Failure: Reduced coolant flow and heat transfer efficiency, causing localized overheating.
Mitigation: Implement water treatment (softening, filtration), regular flushing, and use of inhibitors.

Trigger: Galvanic corrosion due to dissimilar metals in the coolant loop.
Failure: Wall thinning, pinhole leaks, and structural weakening.
Mitigation: Use compatible materials, corrosion-resistant coatings, and maintain proper coolant chemistry with inhibitors.

Trigger: Mechanical vibration or thermal cycling.
Failure: Fatigue cracking at passage junctions or connections.
Mitigation: Design with smooth radii, adequate fillets, and support; use flexible connectors where needed.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 2768-m, pressure testing to 1.5x operating pressure with no leaks.

Test Method

Hydrostatic pressure test, flow rate verification, thermographic inspection for thermal performance.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Cooling Water Passages

Manufacturer profiles associated with Cooling Water Passages.

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Frequently Asked Questions

What is the main purpose of cooling water passages in a center housing?