---
title: "Precision Metering Assembly"
industry: "Other Transport Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:PRECISION_METERING_ASSEMBLY"
  data_integrity_hash: "a7afb1eb7b7590a1dbc71192cbdf4945"
  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:PRECISION_METERING_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/precision-metering-assembly.md"
  official_resource_url: "https://cnfx.com/industry/other-transport-equipment-manufacturing/product/precision-metering-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-15.0 MPa (5-150 bar) at 15-35°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 18.0
    unit: "MPa"
    consequence: "Cavitation-induced erosion at vena contracta when local pressure drops below propellant vapor pressure (0.0023 MPa at 20°C for hydrazine)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Particulate contamination exceeding 5 μm in propellant stream"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install dual 3 μm absolute filters with differential pressure monitoring"
  - node_2:
      trigger: "Thermal cycling between -40°C and +85°C at &gt;2°C/min rate"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement Kalrez 6375 perfluoroelastomer seals with thermal expansion compensation design"
bom_nodes:
  control-valve:
    type: "part"
    urn: "URN:CNFX:ME:CONTROL_VALVE"
    interface_type: "physical-logic-coupled"
  flow-sensor:
    type: "part"
    urn: "URN:CNFX:ME:FLOW_SENSOR"
    interface_type: "physical-logic-coupled"
  metering-chamber:
    type: "part"
    urn: "URN:CNFX:ME:METERING_CHAMBER"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/ASME B46.1-2019 - SURFACE TEXTURE"
    scope: "Verified Engineering Specification"
  - standard: "DIN 2271-1:2016 - PNEUMATIC LENGTH MEASUREMENT"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/other-transport-equipment-manufacturing/product/precision-metering-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "a51eedb8472745cae2c4412e663f2c1ba6eefe8fde7ecf2479b64beecdc97daa"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Precision Metering Assembly

## 1. Technical Definition
A precision assembly within a propellant metering and charging station responsible for accurately measuring and controlling the flow of propellant.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-15.0 MPa (5-150 bar) at 15-35°C**. Failure boundary: **Pressure differential exceeding 18.0 MPa (180 bar) across metering orifice**, Mechanism: **Cavitation-induced erosion at vena contracta when local pressure drops below propellant vapor pressure (0.0023 MPa at 20°C for hydrazine)**.

### 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 |
| :--- | :--- | :--- | :--- |
| Particulate contamination exceeding 5 μm in propellant stream | 8 | Orifice clogging causing flow deviation &gt;±0.5% from setpoint | Install dual 3 μm absolute filters with differential pressure monitoring |
| Thermal cycling between -40°C and +85°C at &gt;2°C/min rate | 8 | Seal extrusion failure leading to leakage rate &gt;1×10⁻⁶ std cc/sec | Implement Kalrez 6375 perfluoroelastomer seals with thermal expansion compensation design |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Control Valve](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/control-valve.md) `(Standalone System)`
- [Flow Sensor](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/flow-sensor.md) `(Standalone System)`
- [Metering Chamber](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/metering-chamber.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Propellant Storage Tank**, **High-Precision Flow Calibration System**, **Automated Control and Monitoring Station**  
**Downstream Applications**: Solid Rocket Motors, Artillery Propellant Charges, Industrial Pyrotechnic Devices  

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

### Q: What industries use precision metering assemblies?
**A**: Primarily used in other transport equipment manufacturing for applications like aerospace, marine, and specialized vehicle propellant systems requiring exact flow measurement.

### Q: How does the precision metering assembly ensure accuracy?
**A**: Through integrated components like the flow sensor and metering chamber made from precision ceramics and high-grade alloys, which maintain stability and resist corrosion under demanding conditions.

### Q: What maintenance is required for these assemblies?
**A**: Minimal maintenance due to durable materials like stainless steel and ceramics, but regular calibration of the control valve and flow sensor is recommended for sustained accuracy.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- ANSI/ASME B46.1-2019 - SURFACE TEXTURE
- DIN 2271-1:2016 - PNEUMATIC LENGTH MEASUREMENT

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Precision Metering Assembly](https://cnfx.com/industry/other-transport-equipment-manufacturing/product/precision-metering-assembly)**

### 🌐 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**: PRECISION_METERING_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: d590d390
