INDUSTRY COMPONENT

Bonnet / Door

A protective cover or door on a ram preventer that provides access for maintenance while containing pressure during drilling operations.

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Component Specifications

Definition
The bonnet/door is a critical structural component of a ram preventer in blowout prevention (BOP) systems, designed to seal the ram cavity and provide access for ram replacement or maintenance. It withstands high-pressure drilling fluids and wellbore pressures while ensuring operational safety through robust sealing mechanisms and locking systems.
Working Principle
The bonnet/door operates as a pressure-retaining closure that seals against the ram preventer body using metal-to-metal seals or elastomeric gaskets. It is secured with bolts or hydraulic locking mechanisms to maintain integrity under extreme pressures, allowing safe isolation of the ram assembly during maintenance without depressurizing the entire BOP stack.
Materials
Forged or cast low-alloy steel (e.g., AISI 4130, 4140) or stainless steel (e.g., 316L), heat-treated for high strength and corrosion resistance, with hardness typically 22-32 HRC. Sealing surfaces may include nickel or chrome plating for wear resistance.
Technical Parameters
  • Bore Size 7-1/16" to 18-3/4"
  • Seal Type Metal ring gasket or elastomeric
  • Connection API flange or clamp hub
  • Pressure Rating 5000-15000 psi
  • Temperature Range -20°C to 120°C
Standards
API 16A, ISO 13533, ASME BPVC Section VIII

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bonnet / Door.

ram preventer bonnet BOP door blowout preventer component drilling safety equipment pressure containment cover Bonnet / Door Bonnet / Door in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Ram Preventer

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.

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Engineering Analysis

Risks & Mitigation
  • Seal failure leading to pressure leaks
  • Structural fatigue from cyclic loading
  • Corrosion in harsh environments
  • Improper bolting causing uneven stress
FMEA Triads
Trigger: Seal degradation due to temperature extremes
Failure: Pressure leakage during operation
Mitigation: Use temperature-resistant seals and regular inspection
Trigger: Bolt torque loss from vibration
Failure: Bonnet displacement under pressure
Mitigation: Implement torque monitoring and locking devices

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Flatness within 0.05 mm per 300 mm, surface finish Ra ≤ 3.2 μm for sealing areas
Test Method
Hydrostatic pressure testing per API 16A at 1.5x working pressure for 30 minutes

Buyer Feedback

★★★★☆ 4.9 / 5.0 (23 reviews)

"Testing the Bonnet / Door now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Bonnet / Door meets all ISO standards."

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Frequently Asked Questions

What is the primary function of a ram preventer bonnet?

To provide a pressure-tight seal for the ram cavity, allowing safe access for maintenance while containing wellbore pressures during drilling operations.

How often should bonnet seals be inspected?

Seals should be inspected during every BOP maintenance cycle (typically every 3-5 years) or after any pressure test failure, following API RP 53 guidelines.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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