---
title: "Blowout Preventer (BOP) Stack"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:BLOWOUT_PREVENTER_BOP_STACK"
  data_integrity_hash: "380fd32775b4afbcc627a6161935d869"
  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:BLOWOUT_PREVENTER_BOP_STACK"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/blowout-preventer-bop-stack.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/blowout-preventer-bop-stack"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "69-103.5 MPa (10,000-15,000 psi) working pressure, -18°C to 121°C (0°F to 250°F) temperature range"
    unit: "MPa"
engineering_limits:
  max_safe_operating_point:
    value: 138
    unit: "MPa"
    consequence: "Ram block seal extrusion failure due to differential pressure exceeding 103.5 MPa (15,000 psi) causing elastomer material yield stress of 20.7 MPa (3,000 psi) to be exceeded, resulting in plastic deformation and loss of sealing integrity"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydraulic fluid contamination with 15 μm particulate exceeding ISO 4406 18/16/13 cleanliness level"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Dual 10 μm absolute filtration with differential pressure monitoring and automatic bypass at 0.35 MPa (50 psi) ΔP"
  - node_2:
      trigger: "Cathodic protection system failure resulting in -850 mV vs Ag/AgCl reference electrode potential deviation"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Sacrificial anode system with 1.5 A/m² current density and 0.25 mm/yr corrosion allowance in design"
bom_nodes:
  annular-preventer:
    type: "part"
    urn: "URN:CNFX:ME:ANNULAR_PREVENTER"
    interface_type: "physical-logic-coupled"
  ram-preventer:
    type: "part"
    urn: "URN:CNFX:ME:RAM_PREVENTER"
    interface_type: "physical-logic-coupled"
  hydraulic-connector:
    type: "part"
    urn: "URN:CNFX:ME:HYDRAULIC_CONNECTOR"
    interface_type: "physical-logic-coupled"
  control-pod:
    type: "part"
    urn: "URN:CNFX:ME:CONTROL_POD"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 13533:2001 - DRILLING AND PRODUCTION EQUIPMENT - BLOWOUT PREVENTER EQUIPMENT"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING - DIRECTIVE 2014/68/EU (PRESSURE EQUIPMENT DIRECTIVE)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/blowout-preventer-bop-stack.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "2127f6f1fbce815ba2c314f3fb987e03b049e7cd73d7953063e639d55e921f54"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Blowout Preventer (BOP) Stack

## 1. Technical Definition
A critical safety assembly installed at the wellhead to prevent uncontrolled release of formation fluids during offshore drilling operations.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **69-103.5 MPa (10,000-15,000 psi) working pressure, -18°C to 121°C (0°F to 250°F) temperature range**. Failure boundary: **138 MPa (20,000 psi) burst pressure, 0.5 mm (0.02 in) annular seal leakage rate exceeding API 16A Class 1 requirements**, Mechanism: **Ram block seal extrusion failure due to differential pressure exceeding 103.5 MPa (15,000 psi) causing elastomer material yield stress of 20.7 MPa (3,000 psi) to be exceeded, resulting in plastic deformation and loss of sealing integrity**.

### 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 |
| :--- | :--- | :--- | :--- |
| Hydraulic fluid contamination with 15 μm particulate exceeding ISO 4406 18/16/13 cleanliness level | 8 | Annular preventer piston seal abrasion causing 0.8 L/min hydraulic fluid leakage | Dual 10 μm absolute filtration with differential pressure monitoring and automatic bypass at 0.35 MPa (50 psi) ΔP |
| Cathodic protection system failure resulting in -850 mV vs Ag/AgCl reference electrode potential deviation | 8 | Stress corrosion cracking in 4130 steel ram blocks at 345 MPa (50 ksi) yield strength material | Sacrificial anode system with 1.5 A/m² current density and 0.25 mm/yr corrosion allowance in design |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Annular Preventer](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/annular-preventer.md) `(Standalone System)`
- [Ram Preventer](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/ram-preventer.md) `(Standalone System)`
- [Hydraulic Connector](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/hydraulic-connector.md) `(Standalone System)`
- [Control Pod](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/control-pod.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**  
**Downstream Applications**: Drilled Wellbore, Cased Wellbore, Completed Well  

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

### Q: What is the primary function of a BOP stack in offshore drilling?
**A**: The BOP stack serves as a critical safety barrier that seals the wellbore to prevent uncontrolled release of formation fluids (kick or blowout) during drilling operations, protecting personnel, equipment, and the environment.

### Q: What materials are used in BOP stack construction for durability?
**A**: BOP stacks are constructed from high-strength alloy steel for structural integrity and pressure containment, with elastomers like Nitrile and HNBR for sealing components that withstand harsh drilling environments and fluids.

### Q: What are the key components included in a standard BOP stack?
**A**: A standard BOP stack typically includes an annular preventer for flexible sealing around drill pipes, ram preventers for shearing and sealing, a control pod for hydraulic operation, and hydraulic connectors for secure wellhead attachment.

## 6. Manufacturing Compliance
- ISO 13533:2001 - DRILLING AND PRODUCTION EQUIPMENT - BLOWOUT PREVENTER EQUIPMENT
- CE MARKING - DIRECTIVE 2014/68/EU (PRESSURE EQUIPMENT DIRECTIVE)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Blowout Preventer (BOP) Stack](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/blowout-preventer-bop-stack)**

### 🌐 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**: BLOWOUT_PREVENTER_BOP_STACK | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: b4753323
