---
title: "Upper Head"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:UPPER_HEAD"
  data_integrity_hash: "c6574634587a0d4c43a5b543729c7930"
  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:UPPER_HEAD"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/upper-head.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/upper-head"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-25 bar differential pressure, -40°C to 150°C temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 28
    unit: "bar"
    consequence: "Yield strength of ASTM A516 Grade 70 carbon steel (260 MPa) exceeded at 28 bar differential pressure; thermal expansion mismatch between carbon steel head and stainless steel gasket at 180°C causes seal failure"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Cyclic pressure loading at 15-25 bar range, 1000 cycles/day"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Increase fillet weld radius to 12.7 mm, implement post-weld heat treatment at 620°C for 2 hours"
  - node_2:
      trigger: "Chloride concentration &gt; 25 ppm in process fluid at 80°C"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Apply 316L stainless steel weld overlay (3 mm minimum thickness), install sacrificial anode protection system"
bom_nodes:
  flange-connection:
    type: "component"
    urn: "URN:CNFX:ME:FLANGE_CONNECTION"
    interface_type: "physical-logic-coupled"
  inlet-nozzle:
    type: "component"
    urn: "URN:CNFX:ME:INLET_NOZZLE"
    interface_type: "physical-logic-coupled"
  manway:
    type: "part"
    urn: "URN:CNFX:ME:MANWAY"
    interface_type: "physical-logic-coupled"
  pressure-relief-valve-port:
    type: "component"
    urn: "URN:CNFX:ME:PRESSURE_RELIEF_VALVE_PORT"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-2:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/upper-head.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "9dbba504c9d63738272e632d73f0cd603b123492b8310dc5a9a4c8d6617e0021"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Upper Head

## 1. Technical Definition
The top closure component of a filter vessel that seals the upper end of the cylindrical shell.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-25 bar differential pressure, -40°C to 150°C temperature**. Failure boundary: **28 bar differential pressure or 180°C temperature**, Mechanism: **Yield strength of ASTM A516 Grade 70 carbon steel (260 MPa) exceeded at 28 bar differential pressure; thermal expansion mismatch between carbon steel head and stainless steel gasket at 180°C causes seal failure**.

### 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 |
| :--- | :--- | :--- | :--- |
| Cyclic pressure loading at 15-25 bar range, 1000 cycles/day | 8 | Fatigue crack initiation at head-to-shell weld toe | Increase fillet weld radius to 12.7 mm, implement post-weld heat treatment at 620°C for 2 hours |
| Chloride concentration &gt; 25 ppm in process fluid at 80°C | 8 | Stress corrosion cracking in HAZ of head-to-nozzle connection | Apply 316L stainless steel weld overlay (3 mm minimum thickness), install sacrificial anode protection system |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Manway](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/manway.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Filter Vessel Shell**, **Pressure Testing Equipment**, **Gasket Installation Fixture**  
**Downstream Applications**: Industrial Water Filtration Systems, Chemical Processing Equipment, Pharmaceutical Purification Vessels  

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

### Q: What materials are available for the Upper Head filter vessel closure?
**A**: The Upper Head is manufactured in Stainless Steel 316L for corrosion resistance or Carbon Steel for cost-effective durability in industrial applications.

### Q: What components are included in the Upper Head BOM?
**A**: The Bill of Materials includes Flange Connection for piping, Inlet Nozzle for fluid entry, Manway for maintenance access, and Pressure Relief Valve Port for safety.

### Q: How does the Upper Head seal the filter vessel?
**A**: The Upper Head serves as the top closure component that securely seals the cylindrical shell's upper end, maintaining pressure integrity and preventing leaks in filtration systems.

## 6. Manufacturing Compliance
- ISO 286-2:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Upper Head](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/upper-head)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: UPPER_HEAD | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: f184cf67
