Subsea BOP Hinge Pin

Name: Subsea BOP Hinge Pin | Riser BOP Pivot Pin - Frigate
Price: 249.00 USD
Availability: InStock

Subsea BOP Hinge Pin is continuously subjected to repeated mechanical loading during deployment and retrieval cycles. The Komponente is engineered using high-grade, vacuum-degassed alloy steel with a fine-grain microstructure that supports superior fatigue life under cyclic shear and torsional stress. Critical surfaces of the Subsea BOP Hinge Pin undergo precision grinding followed by controlled shot peening to mitigate surface crack initiation and delay fatigue propagation over prolonged service intervals.

Material Grade & Specification

AISI 4340 Alloy Steel (or equivalent), API Spec 16A, ASTM A182 F22 (for high strength)

Dimensional Tolerances

±0.005 inches (±0.13 mm) for critical dimensions, ±0.002 inches (±0.05 mm) for threads

Surface Finish Requirement

Ra ≤ 1.6 µm (63 µin) for sealing surfaces, Ra ≤ 3.2 µm (125 µin) for non-critical areas

Heat Treatment Specification

Quenching and Tempering (QT) to 28-32 HRC (Hardness) for optimal strength and toughness

Concentricity Requirement

≤ 0.002 inches (0.05 mm) for bore to OD concentricity, critical for performance in subsea environment

Product Description

Subsea BOP Hinge Pin must reliably transmit mechanical force between the BOP body and the ram door assemblies under hydrostatic pressures exceeding 15,000 psi. The pin’s geometry, including its fillet radius and bearing contact surfaces, is precisely calculated through finite element analysis (FEA) to ensure stress distribution remains below the endurance limit of the base material. This design ensures the Subsea BOP Hinge Pin performs without plastic deformation or galling, even under extreme compressive and torsional loads.

Thread Type & Specification

API Spec 16A, Buttress Thread (API 8RD, 8CT, 10RD) or custom-specific thread types

Hardness Requirement

28-32 HRC (after heat treatment)

Non-Destructive Testing (NDT) Requirement

Ultrasonic Testing (UT), Magnetic Particle Testing (MT), Dye Penetrant Testing (DPT) as per API standards

Load Capacity / Tensile Strength Requirement

Minimum 150,000 psi (1034 MPa) or as per specific custom requirements for subsea operations

Certification Standard

API Spec 16A, ISO 9001:2015, PED (Pressure Equipment Directive), ATEX (if required)

Technical Advantages

Subsea BOP Hinge Pin operates in highly corrosive deepwater environments that expose it to chloride-rich brines, CO₂, and H₂S. The surface of each Subsea BOP Hinge Pin is protected using a combination of high-performance coatings such as thermally sprayed Inconel overlays or diffusion-bonded nitriding. Material selection considers susceptibility to hydrogen-induced cracking (HIC), and all Subsea BOP Hinge Pins are post-processed using high-temperature baking protocols after electroplating to eliminate hydrogen absorption.

Subsea BOP Hinge Pin experiences thermal contraction due to exposure to subsea temperatures ranging from 4°C to -1°C. All dimensions and tolerances are validated under cryogenic simulation to ensure the Subsea BOP Hinge Pin maintains proper fit and function within the BOP hinge mechanism. The pin’s coefficient of thermal expansion (CTE) is matched with adjacent components to prevent interference binding or misalignment during thermal cycling.

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Industry Applications

Deepwater Blowout Preventer Assemblies

Used to support pivot motion of ram doors under high-pressure cycles in subsea BOP stacks at depths exceeding 10,000 feet.

Subsea Drilling Stack Interfaces

Provides mechanical articulation between ram body and housing during stack deployment, retrieval, and in-situ hydraulic actuation under subsea conditions.

High-Pressure Ram Closure Mechanisms

Transmits compressive and torsional forces across closure arms during emergency shearing or sealing operations in high-pressure well control events.

Marine Riser Connector Systems

Ensures secure hinge motion during riser-to-BOP connection, accommodating thermal expansion and external bending moments without misalignment.

Subsea Intervention Systems

Supports critical alignment in hydraulic override units and workover BOPs used during well intervention and maintenance under pressure.

BOP Control Pod Enclosures

Integrated in pod framework hinges to enable precise access panel movement under subsea pressure differential and corrosive fluid ingress.

Certified for Critical Service Performance

Subsea BOP Hinge Pin is built under strict QA protocols in accordance with API 16A and NACE MR0175. Each pin undergoes UT, MT, and CMM inspection to verify dimensional and structural integrity. Complete documentation ensures full traceability, mechanical validation, and compliance for critical offshore applications.

To prevent misalignment or uneven ram loading, each Subsea BOP Hinge Pin is finished to ±5 micron tolerances using lapping and precision gauging. Interference fits and anti-rotation features ensure stable, backlash-free engagement—even after repeated subsea pressure cycles.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure the hinge pin maintains dimensional stability under deepwater thermal gradients?

Fregatte uses low-expansion alloys that match the thermal behavior of adjoining BOP components. Each Subsea BOP Hinge Pin is tested in simulated cryogenic environments. Dimensional shifts are mapped using precision CMM inspection. This ensures reliable hinge alignment during subsea pressure and temperature cycling.

What non-destructive tests does Frigate perform to verify hinge pin integrity for critical service?

Frigate conducts UT, MT, and dye penetrant tests on every Subsea BOP Hinge Pin. These methods detect internal voids, surface cracks, and stress concentrations. Testing follows API 16A and customer-specific inspection levels. Only pins passing all criteria are cleared for offshore deployment.

How does Frigate prevent hydrogen embrittlement in high-strength hinge pin materials?

Frigate uses post-electroplating baking at controlled temperatures to release trapped hydrogen. Material selection complies with NACE MR0175 for sour service resistance. Surface treatments like nitriding and Inconel overlay reduce hydrogen diffusion risk. This ensures long-term performance in H₂S-rich subsea environments.

How does Frigate control backlash in hinge pin assemblies for BOP ram doors?

Frigate machines every Subsea BOP Hinge Pin to ±5 micron tolerances using CNC grinding and lapping. Anti-rotation flats and interference fits are applied as needed. These features eliminate unwanted axial or radial movement. The result is zero play under cyclic subsea loading.

Can Frigate customize hinge pin geometry for legacy or OEM-specific BOP systems?

Yes, Frigate reverse-engineers hinge pins using 3D scanning and historical drawings. Custom profiles, fillet blends, and keyway features are supported. Metallurgy and surface coatings are adapted to match original or enhanced performance standards. This allows seamless integration into both legacy and modern BOPs.

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