---
title: "Cylindrical Shell"
industry: "Fabricated Metal Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CYLINDRICAL_SHELL"
  data_integrity_hash: "6f5a8d173562302058d69afd8fa5021d"
  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:CYLINDRICAL_SHELL"
  data_source_uri: "https://cnfx.com/llms/industry/fabricated-metal-product-manufacturing/product/cylindrical-shell.md"
  official_resource_url: "https://cnfx.com/industry/fabricated-metal-product-manufacturing/product/cylindrical-shell"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.1-25 MPa (1-250 bar) at 20-350°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 345
    unit: "MPa"
    consequence: "Plastic deformation exceeding yield strength due to hoop stress (σ_h = P·D/(2t)) or elastic instability (buckling) at critical pressure P_cr = (2E/(1-ν²))·(t/D)³"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Corrosion rate exceeding 0.5 mm/year in chloride environment"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Apply 3.0 mm corrosion allowance + cathodic protection at -0.85 V vs. Ag/AgCl reference electrode"
  - node_2:
      trigger: "Cyclic pressure fluctuation ΔP=15 MPa at 0.5 Hz frequency"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Post-weld heat treatment at 620°C for 1 hour + ultrasonic testing at 5 MHz frequency"
bom_nodes:
  shell-plate:
    type: "component"
    urn: "URN:CNFX:ME:SHELL_PLATE"
    interface_type: "physical-logic-coupled"
  longitudinal-seam:
    type: "component"
    urn: "URN:CNFX:ME:LONGITUDINAL_SEAM"
    interface_type: "physical-logic-coupled"
  circumferential-seam:
    type: "component"
    urn: "URN:CNFX:ME:CIRCUMFERENTIAL_SEAM"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/fabricated-metal-product-manufacturing/product/cylindrical-shell.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b74d5605f288c540b1a75a5c067ea8337a8ab938473ed1e9e9d48d256f19fefe"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Cylindrical Shell

## 1. Technical Definition
The primary cylindrical body section of a pressure vessel that contains the pressurized fluid or gas.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.1-25 MPa (1-250 bar) at 20-350°C**. Failure boundary: **Yield stress of material (e.g., 345 MPa for SA-516 Gr.70 steel) or buckling pressure (e.g., 32 MPa for L/D=5, t/D=0.01)**, Mechanism: **Plastic deformation exceeding yield strength due to hoop stress (σ_h = P·D/(2t)) or elastic instability (buckling) at critical pressure P_cr = (2E/(1-ν²))·(t/D)³**.

### 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 |
| :--- | :--- | :--- | :--- |
| Corrosion rate exceeding 0.5 mm/year in chloride environment | 8 | Wall thickness reduction below minimum required thickness (t_min = P·D/(2S·E-0.2P)) | Apply 3.0 mm corrosion allowance + cathodic protection at -0.85 V vs. Ag/AgCl reference electrode |
| Cyclic pressure fluctuation ΔP=15 MPa at 0.5 Hz frequency | 8 | Fatigue crack initiation at stress concentration factor K_t=2.5 weld toe | Post-weld heat treatment at 620°C for 1 hour + ultrasonic testing at 5 MHz frequency |

## 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**: **Rolling Machine**, **Welding Positioner**, **Non-Destructive Testing Equipment**  
**Downstream Applications**: Industrial Boilers, Chemical Reactors, Storage Tanks  

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

### Q: What materials are commonly used for cylindrical shells in pressure vessels?
**A**: Cylindrical shells are typically fabricated from carbon steel, stainless steel, or alloy steel, chosen based on factors like pressure requirements, corrosion resistance, and operating temperature.

### Q: What are the key components in a cylindrical shell's bill of materials (BOM)?
**A**: The primary BOM components include the shell plate (main body material), longitudinal seams (vertical welds), and circumferential seams (horizontal welds), which together form the pressurized containment structure.

### Q: How does the cylindrical shell function in a pressure vessel system?
**A**: The cylindrical shell serves as the primary containment body that holds pressurized fluids or gases, designed to withstand internal pressure stresses through proper material selection, thickness, and welded seam integrity.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Cylindrical Shell](https://cnfx.com/industry/fabricated-metal-product-manufacturing/product/cylindrical-shell)**

### 🌐 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**: CYLINDRICAL_SHELL | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: c37b161a
