---
title: "Main Drum"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:MAIN_DRUM"
  data_integrity_hash: "7852638b6366413ba0ce7924f30388af"
  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_DRUM"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/main-drum.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/main-drum"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "15-45 kN line tension, 0-120 rpm rotational speed, -20°C to 80°C ambient temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 50
    unit: "kN"
    consequence: "High-cycle fatigue failure due to alternating bending stresses from line tension fluctuations (σ_max &gt; 250 MPa yield strength), thermal stress cracking from differential expansion between drum core and flange (ΔT &gt; 100°C), abrasive wear from wire rope contact (coefficient of friction μ &gt; 0.15)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Sudden loss of braking torque due to hydraulic pressure drop below 7 MPa"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Dual redundant hydraulic braking system with independent pressure sensors and automatic mechanical brake engagement at 90 rpm"
  - node_2:
      trigger: "Corrosive pitting from H2S exposure in drilling fluid exceeding 50 ppm concentration"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Cladding with Inconel 625 alloy (2 mm thickness) and cathodic protection system maintaining -850 mV potential"
bom_nodes:
  brake-drum-surface:
    type: "component"
    urn: "URN:CNFX:ME:BRAKE_DRUM_SURFACE"
    interface_type: "physical-logic-coupled"
  drum-barrel:
    type: "part"
    urn: "URN:CNFX:ME:DRUM_BARREL"
    interface_type: "physical-logic-coupled"
  drum-flanges:
    type: "component"
    urn: "URN:CNFX:ME:DRUM_FLANGES"
    interface_type: "physical-logic-coupled"
  drum-shaft:
    type: "component"
    urn: "URN:CNFX:ME:DRUM_SHAFT"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/main-drum.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "406ac4facfa66629a58bdb6f192f4e6cf19893a1c497c15eb372017c827a2786"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Main Drum

## 1. Technical Definition
The primary rotating cylinder in a drawworks system that spools and controls the drilling line.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **15-45 kN line tension, 0-120 rpm rotational speed, -20°C to 80°C ambient temperature**. Failure boundary: **Line tension exceeding 50 kN causes permanent drum deformation, rotational speed above 150 rpm induces critical vibration (&gt;0.5 mm displacement), temperature below -30°C embrittles drum material (ASTM A36 steel)**, Mechanism: **High-cycle fatigue failure due to alternating bending stresses from line tension fluctuations (σ_max &gt; 250 MPa yield strength), thermal stress cracking from differential expansion between drum core and flange (ΔT &gt; 100°C), abrasive wear from wire rope contact (coefficient of friction μ &gt; 0.15)**.

### 2.1 Analytical Physics Model
Governed by the **L10 Bearing Life & Fatigue Model**:

> **Primary Equation**: $L_{10} = (\frac{C}{P})^p$  
> **Engineering Impact**: Predicts mechanical lifecycle before component fatigue.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| C | Dynamic Load Rating | Engineering Constant |
| P | Equivalent Dynamic Load | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Sudden loss of braking torque due to hydraulic pressure drop below 7 MPa | 8 | Uncontrolled drum over-speed leading to line overwrap and structural failure | Dual redundant hydraulic braking system with independent pressure sensors and automatic mechanical brake engagement at 90 rpm |
| Corrosive pitting from H2S exposure in drilling fluid exceeding 50 ppm concentration | 8 | Stress corrosion cracking initiating at pit locations, propagating to drum fracture | Cladding with Inconel 625 alloy (2 mm thickness) and cathodic protection system maintaining -850 mV potential |

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

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

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Drawworks Brake System**, **Drilling Line Spooling Mechanism**, **Power Transmission Gearbox**  
**Downstream Applications**: Oil Wells, Gas Wells, Geothermal Wells  

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

### Q: What is the primary function of the main drum in a drawworks system?
**A**: The main drum serves as the primary rotating cylinder that spools and controls the drilling line, managing the hoisting and lowering operations during drilling processes.

### Q: What materials are used in manufacturing the main drum?
**A**: Our main drums are constructed from high-strength alloy steel, providing exceptional durability, wear resistance, and load-bearing capacity for demanding industrial applications.

### Q: What are the key components included in the main drum assembly?
**A**: The main drum assembly consists of four essential components: Drum Barrel, Drum Flanges, Drum Shaft, and Brake Drum Surface, engineered for optimal performance and reliability.

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

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Main Drum](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/main-drum)**

### 🌐 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**: MAIN_DRUM | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: b3f0176e
