---
title: "Distribution Header"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:DISTRIBUTION_HEADER"
  data_integrity_hash: "ad40e4a490a1ef910c26779c4f74d799"
  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:DISTRIBUTION_HEADER"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/distribution-header.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/distribution-header"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-3.0 bar differential pressure, 5-95°C fluid temperature, 0.1-5.0 m/s inlet velocity"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 4.2
    unit: "bar"
    consequence: "Pressure-induced hoop stress exceeding yield strength of 316L stainless steel (205 MPa), fluid velocity exceeding erosion-corrosion threshold for copper-nickel alloys (6 m/s in seawater), thermal expansion mismatch between header (α=16.0×10⁻⁶/°C) and tube sheet (α=11.7×10⁻⁶/°C)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Two-phase flow at inlet causing maldistribution"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Installation of phase separator upstream with minimum 0.5 m vertical separation distance"
  - node_2:
      trigger: "Chloride stress corrosion cracking at &gt;50 ppm Cl⁻ concentration"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Material substitution to duplex stainless steel (UNS S32205) with PREN&gt;35"
bom_nodes:
  header-bodyshell:
    type: "component"
    urn: "URN:CNFX:ME:HEADER_BODYSHELL"
    interface_type: "physical-logic-coupled"
  inlet-nozzleflange:
    type: "component"
    urn: "URN:CNFX:ME:INLET_NOZZLEFLANGE"
    interface_type: "physical-logic-coupled"
  outlet-nozzlestube-stubs:
    type: "component"
    urn: "URN:CNFX:ME:OUTLET_NOZZLESTUBE_STUBS"
    interface_type: "physical-logic-coupled"
  internal-bafflesdiffusers:
    type: "component"
    urn: "URN:CNFX:ME:INTERNAL_BAFFLESDIFFUSERS"
    interface_type: "physical-logic-coupled"
  support-brackets:
    type: "component"
    urn: "URN:CNFX:ME:SUPPORT_BRACKETS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "PED 2014/68/EU - PRESSURE EQUIPMENT DIRECTIVE"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/distribution-header.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "1e9fea274bd46f554a342037a6ec9cafc2038d78555123654213030dae539493"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Distribution Header

## 1. Technical Definition
A component of an evaporator that evenly distributes the feed liquid or vapor to multiple tubes or channels.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-3.0 bar differential pressure, 5-95°C fluid temperature, 0.1-5.0 m/s inlet velocity**. Failure boundary: **Cracking at 4.2 bar differential pressure, erosion failure at 8.0 m/s inlet velocity, thermal stress cracking at ΔT&gt;120°C across header body**, Mechanism: **Pressure-induced hoop stress exceeding yield strength of 316L stainless steel (205 MPa), fluid velocity exceeding erosion-corrosion threshold for copper-nickel alloys (6 m/s in seawater), thermal expansion mismatch between header (α=16.0×10⁻⁶/°C) and tube sheet (α=11.7×10⁻⁶/°C)**.

### 2.1 Analytical Physics Model
Governed by the **Thin-Wall Pressure Vessel Stress Analysis**:

> **Primary Equation**: $\sigma_h = \frac{P \cdot D}{2t}$  
> **Engineering Impact**: Determines the hoop stress boundary to prevent rupture.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| P | Internal Pressure | Engineering Constant |
| D | Diameter | Engineering Constant |
| t | Wall Thickness | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Two-phase flow at inlet causing maldistribution | 8 | Uneven flow distribution leading to localized dryout in evaporator tubes | Installation of phase separator upstream with minimum 0.5 m vertical separation distance |
| Chloride stress corrosion cracking at &gt;50 ppm Cl⁻ concentration | 8 | Intergranular cracking initiating at weld heat-affected zones | Material substitution to duplex stainless steel (UNS S32205) with PREN&gt;35 |

## 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**: **Evaporator System**, **Feed Pump**, **Heat Exchanger**  
**Downstream Applications**: Concentrated Fruit Juice, Pharmaceutical Solutions, Desalinated Water  

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

### Q: What materials are commonly used for Distribution Headers in evaporator systems?
**A**: Distribution Headers are typically manufactured from materials like Stainless Steel (304, 316L), Carbon Steel, Duplex Stainless Steel, and Nickel Alloys to withstand corrosive environments and high temperatures in evaporator applications.

### Q: How does a Distribution Header improve evaporator efficiency?
**A**: A Distribution Header ensures even distribution of feed liquid or vapor across multiple tubes or channels, preventing dry spots and hot spots, which enhances heat transfer efficiency and reduces energy consumption in evaporator systems.

### Q: What are the key components of a Distribution Header assembly?
**A**: A complete Distribution Header assembly includes a Header Body/Shell, Inlet Nozzle/Flange, multiple Outlet Nozzles/Tube Stubs for tube connections, Internal Baffles/Diffusers for flow distribution, and Support Brackets for structural stability.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- PED 2014/68/EU - PRESSURE EQUIPMENT DIRECTIVE

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Distribution Header](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/distribution-header)**

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

> **Reference ID**: DISTRIBUTION_HEADER | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: ab1d1d67
