---
title: "Coolant Reservoir/Tank"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:COOLANT_RESERVOIRTANK"
  data_integrity_hash: "3087519959d18c356dff21545f5973a8"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:COOLANT_RESERVOIRTANK"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/coolant-reservoirtank.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/coolant-reservoirtank"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.3-1.2 bar (gauge pressure)"
    unit: "L"
engineering_limits:
  max_safe_operating_point:
    value: 1.8
    unit: "bar"
    consequence: "Hoop stress exceeding yield strength (σ_θ = P·r/t) for overpressure; Euler buckling instability (P_crit = π²·E·I/L²) for vacuum collapse"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Electrochemical corrosion from ethylene glycol degradation forming formic acid (pH &lt; 6.5)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Anodic protection with 0.1% sodium molybdate inhibitor and 316L stainless steel construction"
  - node_2:
      trigger: "Thermal cycling between 20°C and 120°C at 3 cycles/hour"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Glass-fiber reinforced nylon 6/6 brackets with coefficient of thermal expansion 23×10⁻⁶/°C"
bom_nodes:
  tank-body:
    type: "component"
    urn: "URN:CNFX:ME:TANK_BODY"
    interface_type: "physical-logic-coupled"
  filler-neck:
    type: "component"
    urn: "URN:CNFX:ME:FILLER_NECK"
    interface_type: "physical-logic-coupled"
  pressure-cap:
    type: "component"
    urn: "URN:CNFX:ME:PRESSURE_CAP"
    interface_type: "physical-logic-coupled"
  overflow-tube-connection:
    type: "component"
    urn: "URN:CNFX:ME:OVERFLOW_TUBE_CONNECTION"
    interface_type: "physical-logic-coupled"
  return-line-connection:
    type: "component"
    urn: "URN:CNFX:ME:RETURN_LINE_CONNECTION"
    interface_type: "physical-logic-coupled"
  level-indicator:
    type: "part"
    urn: "URN:CNFX:ME:LEVEL_INDICATOR"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING (EU MACHINERY DIRECTIVE 2006/42/EC)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/coolant-reservoirtank.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "c8951240f2ed5968e89bbeb0e62a613647b13efe09274a790baca7948f2506ae"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Coolant Reservoir/Tank

## 1. Technical Definition
A container that stores and supplies coolant fluid to maintain proper levels in the cooling system.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.3-1.2 bar (gauge pressure)**. Failure boundary: **Plastic deformation at 1.8 bar internal pressure or vacuum collapse at -0.5 bar external pressure differential**, Mechanism: **Hoop stress exceeding yield strength (σ_θ = P·r/t) for overpressure; Euler buckling instability (P_crit = π²·E·I/L²) for vacuum collapse**.

### 2.1 Analytical Physics Model
Governed by the **Darcy-Weisbach Pressure Drop**:

> **Primary Equation**: $\Delta P = f \cdot \frac{L}{D} \cdot \frac{\rho v^2}{2}$  
> **Engineering Impact**: Critical for sizing CIP (Clean-In-Place) pump heads.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| f | Friction Factor | Engineering Constant |
| L | Pipe Length | Engineering Constant |
| v | Velocity | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Electrochemical corrosion from ethylene glycol degradation forming formic acid (pH &lt; 6.5) | 8 | Pinhole leakage at weld seams due to wall thickness reduction below 0.8 mm | Anodic protection with 0.1% sodium molybdate inhibitor and 316L stainless steel construction |
| Thermal cycling between 20°C and 120°C at 3 cycles/hour | 8 | Stress cracking at injection-molded polypropylene mounting brackets | Glass-fiber reinforced nylon 6/6 brackets with coefficient of thermal expansion 23×10⁻⁶/°C |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | L | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Level Indicator](https://cnfx.com/llms/industry/chemical-manufacturing/product/level-indicator.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Injection Molding Machine**, **Industrial Chiller**, **Hopper Dryer**  
**Downstream Applications**: Automotive Engine Cooling Systems, Heavy-Duty Truck Cooling Systems, Industrial Machinery Cooling Systems  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are best for coolant reservoir tanks in automotive applications?
**A**: Polypropylene, high-density polyethylene (HDPE), and polyamide are preferred for their chemical resistance to coolants, durability under temperature fluctuations, and lightweight properties.

### Q: How does a coolant reservoir tank function in a vehicle's cooling system?
**A**: It stores excess coolant, allows for expansion as temperatures rise, and supplies coolant back to the system as needed via connections like the return line and overflow tube to maintain optimal levels.

### Q: What are key components to look for in a coolant reservoir BOM?
**A**: Essential components include the tank body, filler neck for adding coolant, pressure cap to maintain system pressure, level indicator for monitoring, and connections for overflow and return lines.

## 6. Manufacturing Compliance
- ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS
- CE MARKING (EU MACHINERY DIRECTIVE 2006/42/EC)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Coolant Reservoir/Tank](https://cnfx.com/industry/motor-vehicle-manufacturing/product/coolant-reservoirtank)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **6** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: COOLANT_RESERVOIRTANK | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 108ac31f
