---
title: "Guide Tube"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:GUIDE_TUBE"
  data_integrity_hash: "30aa613520ad230e3d6dc6d478f24a62"
  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:GUIDE_TUBE"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/guide-tube.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/guide-tube"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-350°C temperature, 0-15.5 MPa pressure, 0-2.5 m/s flow velocity"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 310
    unit: "MPa"
    consequence: "Irradiation-induced creep deformation exceeding 1.0% strain due to neutron flux &gt;1×10¹⁴ n/cm²·s, causing dimensional instability and potential control rod binding"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydride precipitation at 200-300°C due to hydrogen concentration &gt;25 ppm in Zircaloy-4"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Hydrogen gettering with niobium liner (0.1 mm thickness) and post-weld heat treatment at 580°C for 2 hours"
  - node_2:
      trigger: "Differential thermal expansion between guide tube (α=5.8×10⁻⁶/°C) and support grid (α=11.5×10⁻⁶/°C) at ΔT&gt;100°C"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Flexible Inconel-718 bellows expansion joints with 15 mm axial travel capacity and 5° angular misalignment tolerance"
bom_nodes:
  tube-body:
    type: "component"
    urn: "URN:CNFX:ME:TUBE_BODY"
    interface_type: "physical-logic-coupled"
  internal-linercoating:
    type: "component"
    urn: "URN:CNFX:ME:INTERNAL_LINERCOATING"
    interface_type: "physical-logic-coupled"
  mounting-flange:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_FLANGE"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-2:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI B4.1-1967 (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN 7150-1:2017 (SYSTEM OF LIMITS AND FITS - BASES OF TOLERANCES, DEVIATIONS AND FITS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/guide-tube.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "77d83d7f953edd4f092898bf48da2f082f42be220aa67942b51fd89ccdabf993"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Guide Tube

## 1. Technical Definition
A precision tubular component that provides a controlled pathway for control rods within a nuclear reactor core.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-350°C temperature, 0-15.5 MPa pressure, 0-2.5 m/s flow velocity**. Failure boundary: **Material yield strength threshold: 310 MPa for Zircaloy-4 at 350°C, 0.5 mm permanent deformation limit, 1.0% strain limit**, Mechanism: **Irradiation-induced creep deformation exceeding 1.0% strain due to neutron flux &gt;1×10¹⁴ n/cm²·s, causing dimensional instability and potential control rod binding**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Hydride precipitation at 200-300°C due to hydrogen concentration &gt;25 ppm in Zircaloy-4 | 8 | Hydride embrittlement causing radial cracking at stress &gt;150 MPa | Hydrogen gettering with niobium liner (0.1 mm thickness) and post-weld heat treatment at 580°C for 2 hours |
| Differential thermal expansion between guide tube (α=5.8×10⁻⁶/°C) and support grid (α=11.5×10⁻⁶/°C) at ΔT&gt;100°C | 8 | Thermal stress-induced ovalization exceeding 0.3 mm deviation from circularity | Flexible Inconel-718 bellows expansion joints with 15 mm axial travel capacity and 5° angular misalignment tolerance |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Ultrasonic Cleaning System**, **Coordinate Measuring Machine (CMM)**, **High-Precision CNC Lathe**  
**Downstream Applications**: Nuclear Reactor Control Rod Assembly, Nuclear Fuel Assembly, Reactor Core Internals  

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

### Q: What materials are commonly used for nuclear reactor guide tubes?
**A**: Guide tubes are typically manufactured from zirconium alloys like Zircaloy-4 for corrosion resistance, stainless steel 316L for durability, or Inconel alloys for high-temperature performance in nuclear environments.

### Q: What are the key components in a guide tube bill of materials (BOM)?
**A**: The primary BOM components include the tube body (main structural element), internal liner/coating (for wear and corrosion protection), and mounting flange (for secure installation in the reactor assembly).

### Q: Why is precision critical in guide tube manufacturing for nuclear applications?
**A**: Precision ensures exact alignment and smooth movement of control rods within reactor cores, which is essential for safe reactor operation, accurate control of nuclear reactions, and prevention of mechanical failures.

## 6. Manufacturing Compliance
- ISO 286-2:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)
- ANSI B4.1-1967 (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)
- DIN 7150-1:2017 (SYSTEM OF LIMITS AND FITS - BASES OF TOLERANCES, DEVIATIONS AND FITS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Guide Tube](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/guide-tube)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: GUIDE_TUBE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 2d01ea63
