---
title: "DEF Supply Pump"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:DEF_SUPPLY_PUMP"
  data_integrity_hash: "732c59cef3d9b07a2166b2378d5c64f0"
  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:DEF_SUPPLY_PUMP"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/def-supply-pump.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/def-supply-pump"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "3.5-6.0 bar (50-87 psi)"
    unit: "L/h"
engineering_limits:
  max_safe_operating_point:
    value: 0.8
    unit: "m"
    consequence: "Cavitation-induced erosion from vapor bubble collapse at pump impeller surfaces when local pressure drops below DEF vapor pressure (1.7 kPa at 20°C)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "DEF crystallization at temperatures below -11°C"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated 500W immersion heater maintaining DEF temperature &gt; -5°C"
  - node_2:
      trigger: "Corrosive attack from DEF decomposition products (ammonia, isocyanic acid)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Cathodic protection with -0.85V vs. SCE reference electrode"
bom_nodes:
  electric-motor:
    type: "part"
    urn: "URN:CNFX:ME:ELECTRIC_MOTOR"
    interface_type: "physical-logic-coupled"
  pumping-mechanism-diaphragmpiston:
    type: "part"
    urn: "URN:CNFX:ME:PUMPING_MECHANISM_DIAPHRAGMPISTON"
    interface_type: "physical-logic-coupled"
  inletoutlet-valves:
    type: "part"
    urn: "URN:CNFX:ME:INLETOUTLET_VALVES"
    interface_type: "physical-logic-coupled"
  integrated-filter:
    type: "part"
    urn: "URN:CNFX:ME:INTEGRATED_FILTER"
    interface_type: "physical-logic-coupled"
  heating-element:
    type: "part"
    urn: "URN:CNFX:ME:HEATING_ELEMENT"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 5199:2016 - TECHNICAL SPECIFICATIONS FOR CENTRIFUGAL PUMPS"
    scope: "Verified Engineering Specification"
  - standard: "EN 809:1998+A1:2009 - PUMPS AND PUMP UNITS FOR LIQUIDS - COMMON SAFETY REQUIREMENTS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/def-supply-pump.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b2078ae19f10ab2e02b8d8f8161514b11f97066b599d4e20da1fcc0eebed820f"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: DEF Supply Pump

## 1. Technical Definition
A pump that supplies Diesel Exhaust Fluid (DEF/AdBlue) from the storage tank to the injection system in selective catalytic reduction (SCR) systems.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **3.5-6.0 bar (50-87 psi)**. Failure boundary: **Cavitation occurs at NPSHa &lt; 0.8 m (2.6 ft) or discharge pressure &gt; 8.0 bar (116 psi)**, Mechanism: **Cavitation-induced erosion from vapor bubble collapse at pump impeller surfaces when local pressure drops below DEF vapor pressure (1.7 kPa at 20°C)**.

### 2.1 Analytical Physics Model
Governed by the **Darcy-Weisbach Pressure Drop**:

> **Primary Equation**: $\Delta P = f \cdot \frac{L}{D} \cdot \frac{\rho v^2}{2}$  
> **Engineering Impact**: Critical for sizing CIP (Clean-In-Place) pump heads.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| f | Friction Factor | Engineering Constant |
| L | Pipe Length | Engineering Constant |
| v | Velocity | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| DEF crystallization at temperatures below -11°C | 8 | Impeller mechanical lock due to urea crystal formation | Integrated 500W immersion heater maintaining DEF temperature &gt; -5°C |
| Corrosive attack from DEF decomposition products (ammonia, isocyanic acid) | 8 | Stainless steel 316L component pitting corrosion at pH &gt; 9.3 | Cathodic protection with -0.85V vs. SCE reference electrode |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Electric Motor](https://cnfx.com/llms/industry/electrical-equipment-manufacturing/product/electric-motor.md) `(Standalone System)`
- [Pumping Mechanism (Diaphragm/Piston)](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/pumping-mechanism-diaphragmpiston.md) `(Standalone System)`
- [Inlet/Outlet Valves](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/inletoutlet-valves.md) `(Standalone System)`
- [Integrated Filter](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/integrated-filter.md) `(Standalone System)`
- [Heating Element](https://cnfx.com/llms/industry/electrical-equipment-manufacturing/product/heating-element.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **DEF Storage Tank**, **SCR Injection System**, **Electronic Control Unit (ECU)**  
**Downstream Applications**: Commercial Trucks, Passenger Diesel Vehicles, Heavy Equipment  

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

### Q: What materials are used in the DEF supply pump to ensure compatibility with Diesel Exhaust Fluid?
**A**: The pump features stainless steel for all wetted parts to prevent corrosion, engineering plastics for the housing and diaphragm, and synthetic rubber for seals and diaphragm components, ensuring full compatibility with DEF/AdBlue fluid.

### Q: Does this DEF pump include a heating element for cold weather operation?
**A**: Yes, the pump includes an integrated heating element to prevent DEF from freezing in cold temperatures, ensuring reliable operation in all weather conditions for motor vehicle SCR systems.

### Q: What maintenance is required for the DEF supply pump's integrated filter?
**A**: The integrated filter is designed for long service life with minimal maintenance. Regular inspection during vehicle service intervals is recommended, with replacement typically needed only when flow reduction indicates clogging, usually after extended use.

## 6. Manufacturing Compliance
- ISO 5199:2016 - TECHNICAL SPECIFICATIONS FOR CENTRIFUGAL PUMPS
- EN 809:1998+A1:2009 - PUMPS AND PUMP UNITS FOR LIQUIDS - COMMON SAFETY REQUIREMENTS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: DEF Supply Pump](https://cnfx.com/industry/motor-vehicle-manufacturing/product/def-supply-pump)**

### 🌐 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**: DEF_SUPPLY_PUMP | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 46441338
