Structured Manufacturing Data (2026)

Blowout Preventer (BOP)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Blowout Preventer (BOP) used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Blowout Preventer (BOP) is characterized by the integration of Annular Preventer and Ram Preventer. In industrial production environments, manufacturers listed on CNFX commonly emphasize High-strength alloy steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A critical safety device installed on oil and gas wells to prevent uncontrolled release of formation fluids during drilling operations.

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Product Specifications

Technical details and manufacturing context for Blowout Preventer (BOP)

Definition
The Blowout Preventer (BOP) is a specialized, high-pressure valve system mounted at the wellhead of a rotary drilling rig. Its primary function is to seal, control, and monitor the wellbore to prevent blowouts—the uncontrolled flow of formation fluids (oil, gas, or water) to the surface. It serves as the last line of defense against catastrophic well control incidents, enabling safe drilling, completion, and intervention activities.
Working Principle
The BOP operates by using hydraulic or mechanical force to actuate sealing elements (rams or annular preventers) that close around the drill pipe, casing, or the open wellbore. In an emergency, it can seal the well completely, divert flow to choke lines, or shear through drill pipe to secure the well. Control is typically managed from a remote BOP control panel (accumulator unit) on the rig floor.
Common Materials
High-strength alloy steel, Elastomers (for seals)
Technical Parameters
  • Maximum working pressure rating (e.g., 10,000 psi, 15,000 psi) (psi) Customizable
Components / BOM
  • Annular Preventer
    Forms a seal around any object in the wellbore or the open hole using a reinforced elastomer packing unit
    Material: Steel housing, elastomer packing element
  • Ram Preventer
    Uses opposing steel rams to seal around drill pipe (pipe rams) or seal the open hole (blind/shear rams)
    Material: High-strength alloy steel, elastomer seals
  • Hydraulic Connector
    Connects the BOP stack to the wellhead and provides a pressure-tight seal
    Material: Alloy steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Blowout Preventer (BOP).

high-pressure blowout preventer for oil drilling annular ram BOP hydraulic system alloy steel blowout preventer specifications BOP maintenance and testing procedures API certified blowout preventer equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Rotary Drilling Rig
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Oil Drilling Rig
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Workover Rig
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 20,000 psi
flow rate: N/A (static pressure device)
temperature: -20°C to 150°C
slurry concentration: N/A (not a flow-through component)
Media Compatibility
✓ Drilling mud (water-based) ✓ Drilling mud (oil-based) ✓ Natural gas
Unsuitable: Hydrogen sulfide (H2S) environments without special metallurgy
Sizing Data Required
  • Wellbore diameter (in inches)
  • Maximum anticipated well pressure (in psi)
  • Required ram configuration (annular, pipe, shear/blind)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Seal degradation and leakage
Cause: Exposure to high-pressure fluids, temperature cycling, and chemical incompatibility leading to elastomer hardening, cracking, or extrusion
Hydraulic system failure (e.g., valve sticking, slow operation)
Cause: Contamination in hydraulic fluid (particulates, water), corrosion of internal components, or degradation of seals/oring allowing fluid bypass
Maintenance Indicators
  • Visible hydraulic fluid leaks around ram or annular preventer housings
  • Unusual noises during function testing (e.g., grinding, knocking, or excessive hissing)
Engineering Tips
  • Implement strict fluid cleanliness protocols for hydraulic systems, including regular filtration and fluid analysis to prevent contamination-induced failures
  • Establish a proactive seal replacement schedule based on operating hours and pressure cycles rather than waiting for visible degradation

Compliance & Manufacturing Standards

Reference Standards
ISO 10423:2019 (Petroleum and natural gas industries - Drilling and production equipment - Wellhead and christmas tree equipment) ANSI/API Spec 16A:2018 (Specification for Drill-through Equipment) CE Marking (EU Directive 2014/68/EU for Pressure Equipment)
Manufacturing Precision
  • Bore diameter tolerance: +/-0.025 mm
  • Sealing surface flatness: 0.05 mm maximum deviation
Quality Inspection
  • Hydrostatic Pressure Test (per API 16A requirements)
  • Magnetic Particle Inspection (MPI) for critical welds and surfaces

Factories Producing Blowout Preventer (BOP)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a blowout preventer (BOP) in drilling operations?

A BOP is a critical safety device that seals, controls, and monitors oil and gas wells to prevent uncontrolled release of formation fluids (blowouts) during drilling, completion, and workover operations.

What are the key differences between annular and ram preventers in a BOP stack?

Annular preventers use elastomer sealing elements to close around various pipe sizes or the open hole, while ram preventers use steel rams to seal around specific pipe diameters or shear through pipe to completely seal the wellbore.

What maintenance and testing protocols are required for blowout preventers?

BOPs require regular pressure testing, function testing, visual inspections, and preventive maintenance according to API standards and manufacturer specifications, typically including weekly function tests and pressure tests every 14-21 days during drilling operations.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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