---
title: "Main Flange Body"
industry: "Chemical Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:MAIN_FLANGE_BODY"
  data_integrity_hash: "d93e80f158e3c7e8e9857f655eb288cf"
  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:MAIN_FLANGE_BODY"
  data_source_uri: "https://cnfx.com/llms/industry/chemical-manufacturing/product/main-flange-body.md"
  official_resource_url: "https://cnfx.com/industry/chemical-manufacturing/product/main-flange-body"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-25 MPa at 20-350°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 275
    unit: "MPa"
    consequence: "Stress corrosion cracking due to chloride ion concentration &gt;25 ppm at temperatures above 60°C, following NACE MR0175/ISO 15156 standards"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Thermal cycling between 20°C and 350°C at &gt;5 cycles/hour"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integral thermal expansion compensation grooves with 0.5 mm radial clearance"
  - node_2:
      trigger: "Gasket relaxation exceeding 15% of initial compression force"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Torque sequence control with 30-50-70-100% progressive tightening pattern"
bom_nodes:
  mounting-face:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_FACE"
    interface_type: "physical-logic-coupled"
  bolt-holes:
    type: "component"
    urn: "URN:CNFX:ME:BOLT_HOLES"
    interface_type: "physical-logic-coupled"
  gland-interface-surface:
    type: "component"
    urn: "URN:CNFX:ME:GLAND_INTERFACE_SURFACE"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 7005-1:2011 (FLANGES FOR PIPES, VALVES, FITTINGS)"
    scope: "Verified Engineering Specification"
  - standard: "ASME B16.5:2020 (PIPE FLANGES AND FLANGED FITTINGS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 1092-1:2018 (FLANGES AND THEIR JOINTS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/chemical-manufacturing/product/main-flange-body.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "e16b4df13da1f231e7cd34fc9bd608f7a955e774a03e42781c71c6dd03cd70c8"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Main Flange Body

## 1. Technical Definition
The primary structural flange component of a chemical reactor sealing gland assembly.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-25 MPa at 20-350°C**. Failure boundary: **Yield strength exceeded at 275 MPa stress or 0.2% permanent deformation**, Mechanism: **Stress corrosion cracking due to chloride ion concentration &gt;25 ppm at temperatures above 60°C, following NACE MR0175/ISO 15156 standards**.

### 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 |
| :--- | :--- | :--- | :--- |
| Thermal cycling between 20°C and 350°C at &gt;5 cycles/hour | 8 | Creep-fatigue crack initiation at bolt hole stress concentration zones (Kt=3.2) | Integral thermal expansion compensation grooves with 0.5 mm radial clearance |
| Gasket relaxation exceeding 15% of initial compression force | 8 | Flange rotation exceeding 0.3° causing uneven bolt loading distribution | Torque sequence control with 30-50-70-100% progressive tightening pattern |

## 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**: **Chemical Reactor Vessel**, **Sealing Gland Assembly**, **Pressure Testing Equipment**  
**Downstream Applications**: Chemical Reactor Systems, Pressure Vessel Assemblies, Process Equipment Skids  

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

### Q: What is the primary function of the main flange body in chemical manufacturing?
**A**: The main flange body serves as the primary structural component in chemical reactor sealing gland assemblies, providing secure mounting, pressure containment, and interface connections for safe chemical processing operations.

### Q: Why is Stainless Steel 316L the preferred material for this flange body?
**A**: Stainless Steel 316L offers superior corrosion resistance against harsh chemicals, excellent high-temperature stability, and enhanced durability in corrosive environments typical of chemical manufacturing processes.

### Q: What are the critical specifications to consider when selecting this flange body?
**A**: Key specifications include pressure rating, temperature range, dimensional accuracy of bolt holes, surface finish of gland interface, flatness of mounting face, and compliance with industry standards like ASME B16.5 for chemical applications.

## 6. Manufacturing Compliance
- ISO 7005-1:2011 (FLANGES FOR PIPES, VALVES, FITTINGS)
- ASME B16.5:2020 (PIPE FLANGES AND FLANGED FITTINGS)
- DIN EN 1092-1:2018 (FLANGES AND THEIR JOINTS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Main Flange Body](https://cnfx.com/industry/chemical-manufacturing/product/main-flange-body)**

### 🌐 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**: MAIN_FLANGE_BODY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 05dc0902
