---
title: "Ram Preventer"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:RAM_PREVENTER"
  data_integrity_hash: "53e2cc8d380e0897b6c3d9e9f78c68ab"
  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:RAM_PREVENTER"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/ram-preventer.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/ram-preventer"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "103.4-172.4 MPa (15,000-25,000 psi)"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 241.3
    unit: "MPa"
    consequence: "Elastomer seal extrusion through 0.127 mm (0.005 in) clearance gaps due to Poisson's ratio (ν=0.49) and Young's modulus (E=7 MPa) mismatch under Tresca yield criterion"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydraulic fluid contamination with 15 μm particulate exceeding ISO 4406 18/16/13"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Dual 3 μm absolute filtration with differential pressure monitoring at 0.69 MPa (100 psi) ΔP"
  - node_2:
      trigger: "Stress corrosion cracking in AISI 4130 steel from H₂S partial pressure &gt;0.34 kPa (0.05 psi)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "NACE MR0175 compliant material selection with 22 HRC maximum hardness and 0.5% Ni maximum"
bom_nodes:
  ram-block:
    type: "component"
    urn: "URN:CNFX:ME:RAM_BLOCK"
    interface_type: "physical-logic-coupled"
  packer-element:
    type: "component"
    urn: "URN:CNFX:ME:PACKER_ELEMENT"
    interface_type: "physical-logic-coupled"
  ram-shaft-piston:
    type: "component"
    urn: "URN:CNFX:ME:RAM_SHAFT_PISTON"
    interface_type: "physical-logic-coupled"
  bonnet-door:
    type: "component"
    urn: "URN:CNFX:ME:BONNET_DOOR"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "ANSI B30.1-2015 JACKS, INDUSTRIAL ROLLERS, AIR CASTERS, AND HYDRAULIC GANTRIES"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING FOR MACHINERY DIRECTIVE 2006/42/EC"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/ram-preventer.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "67cbf39348fd719bbd62231a215b1de8486f288e2a9138ed3ed17970ed610bb8"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Ram Preventer

## 1. Technical Definition
A critical safety component within a Blowout Preventer (BOP) stack that uses hydraulically actuated rams to seal around drill pipe or completely close the wellbore to prevent uncontrolled release of formation fluids.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **103.4-172.4 MPa (15,000-25,000 psi)**. Failure boundary: **Seal extrusion occurs at 241.3 MPa (35,000 psi) differential pressure**, Mechanism: **Elastomer seal extrusion through 0.127 mm (0.005 in) clearance gaps due to Poisson's ratio (ν=0.49) and Young's modulus (E=7 MPa) mismatch under Tresca yield criterion**.

### 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 | 8 | Spool valve stiction causing 3.2 second ram closure delay | Dual 3 μm absolute filtration with differential pressure monitoring at 0.69 MPa (100 psi) ΔP |
| Stress corrosion cracking in AISI 4130 steel from H₂S partial pressure &gt;0.34 kPa (0.05 psi) | 8 | Ram body fracture at 75% of yield strength (552 MPa) | NACE MR0175 compliant material selection with 22 HRC maximum hardness and 0.5% Ni maximum |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**, **Control System Console**, **Accumulator Unit**  
**Downstream Applications**: Blowout Preventer Stack, Drilling Rig Safety System, Well Control Package  

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

### Q: What materials are used in Ram Preventer construction?
**A**: Ram Preventers feature forged or cast alloy steel bodies and rams, with elastomeric packer elements made from materials like Nitrile rubber or Hydrogenated Nitrile Butadiene Rubber (HNBR) for reliable sealing under high pressure.

### Q: How does a Ram Preventer function within a BOP stack?
**A**: The Ram Preventer uses hydraulically actuated rams that can either seal around drill pipe or completely close the wellbore, providing critical protection against uncontrolled release of formation fluids during drilling operations.

### Q: What are the main components of a Ram Preventer?
**A**: Key components include the Ram Block, Packer Element, Ram Shaft/Piston, and Bonnet/Door, all engineered to withstand extreme pressure and ensure reliable well control in demanding drilling environments.

## 6. Manufacturing Compliance
- ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS
- ANSI B30.1-2015 JACKS, INDUSTRIAL ROLLERS, AIR CASTERS, AND HYDRAULIC GANTRIES
- CE MARKING FOR MACHINERY DIRECTIVE 2006/42/EC

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Ram Preventer](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/ram-preventer)**

### 🌐 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**: RAM_PREVENTER | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: ddac94e0
