2C03.13 Intermediate Flange & 2S84/2S91 Series Die Assemblies for 5000psi RAM BOPs

Introduction

In oilfield well control operations, 5000psi RAM blowout preventers (BOPs) are critical equipment for preventing blowout accidents, and every component from intermediate flanges to rubber cores directly affects the equipment’s sealing performance and operational safety. The parts listed, including 2C03.13 Intermediate Flange, 2S84.01A.00 Die Assembly, 2S91.01A.00 Die Assembly, 2С01.32 Hex Socket with Hole 21/2П O-ring, and 2С02.08 Main Piston Sealing Ring, are specifically designed as drop-in replacements for 5000psi double RAM BOPs, including Shenkai Rongsheng double RAM BOPs and other mainstream models widely used in onshore and offshore oilfields. These parts fully match the structural dimensions and performance requirements of the target BOPs, solving the core pain points of oilfield maintenance and operation teams—intermediate flange leakage, die assembly deformation, main piston seal failure, and rapid wear of rubber cores, which often lead to BOP shutdown, increased maintenance costs, and even serious well control risks.

Our target users include oilfield well control maintenance engineers, procurement managers of oilfield service companies, and BOP operation teams. For maintenance engineers, the key demand is parts that are easy to install, have strong wear resistance and pressure resistance, and can withstand harsh oilfield conditions; for procurement managers, it is cost-effectiveness, reliable quality, and full compatibility with existing 5000psi RAM BOPs; for operation teams, it is minimizing BOP downtime and ensuring the stability and safety of drilling operations. The core purpose of these parts is to provide a one-stop, high-reliability replacement solution for 5000psi RAM BOPs, covering key components such as intermediate flanges, die assemblies, main piston seals, rubber cores, and fasteners, ensuring the tight sealing, stable operation, and long service life of BOPs in extreme working environments, reducing maintenance frequency and operational risks.

Product Overview

The product portfolio covers all key components of 5000psi RAM BOPs, including intermediate flanges (2C03.13, 2С02.13, 0B3452.1, CB3452.1), flange bolts (2C03.19, 2С02.19), O-rings (2С01.32), main piston components (2C03.22, 2С02.22, 2S03.IA2S02.08, 2С02.3025, 2С02.30), die assemblies (2S91.01А.00, 2S84.01А.00, etc.), die bodies (2S91.01A.02, 2S84.01A.02, etc.), and rubber cores (2S91.01A.01.00, 2S84.01A.01.00, etc.). All parts are manufactured in strict accordance with API Spec 16A (Fourth Edition) international standards and GB/T 20174 national standards, with each part undergoing 100% static pressure testing (up to 7500psi, 1.5 times the working pressure) and dimensional inspection before leaving the factory. Our 2S84.01A.01.00 front rubber core can complete 386 opening and closing cycles and 58 pressure tests without pressure reduction, and can spring back to the standard level at -5℃, which is 22 cycles more than ordinary rubber cores in the market. The 2C03.13 intermediate flange has a tensile strength of 520MPa, meeting the 75K grade low-temperature steel requirements of API 16A, effectively solving the problem of flange deformation and leakage under high pressure.

Function Description

Intermediate Flanges and Fasteners

The intermediate flanges (2C03.13, 2С02.13, 0B3452.1, CB3452.1) are key connecting components of BOPs, responsible for connecting the BOP body and large cylinders, ensuring the overall structural integrity and pressure resistance of the equipment. They solve the pain point of flange leakage caused by insufficient pressure resistance and poor sealing in high-pressure well conditions. The 2C03.19 and 2С02.19 intermediate flange bolts are made of high-strength alloy steel, with an anti-loosening thread design, which can withstand the high vibration and pressure of BOP operations (up to 5000psi), avoiding bolt loosening and flange detachment—a common safety hazard in drilling operations. The 2С01.32 hex socket with hole 21/2П O-ring provides auxiliary sealing for the flange connection, enhancing the sealing performance and preventing well fluid leakage.

Main Piston Components

The main piston components, including 2C03.22 and 2С02.22 closing pistons with gates, 2S03.IA2S02.08 and 2С02.11А2С02.08 main piston sealing rings, and 2С02.3025 and 2С02.30 main piston wear-resistant rings, are core components for BOP opening and closing. The main piston sealing rings are made of HNBR (hydrogenated nitrile rubber), which has excellent high-temperature resistance and corrosion resistance, solving the problem of seal aging and leakage in high-temperature and high-salinity environments. The wear-resistant rings reduce friction between the piston and the cylinder, avoiding piston jamming and extending the piston service life by 4200 hours. The 2C01.20 plug 1-811YC is used for secondary seal lubrication, ensuring smooth operation of the piston and reducing wear of the sealing ring.

Die Assemblies, Die Bodies and Rubber Cores

The die assemblies (2S91.01А.00, 2S84.01А.00, etc.) and die bodies (2S91.01A.02, 2S84.01A.02, etc.) are responsible for fixing and supporting the rubber cores, and transmitting hydraulic driving force to realize the sealing of the BOP. Our die bodies are subjected to magnetic powder探伤 (ASTM E-709) and liquid渗透检测, ensuring no welding defects and strong pressure resistance. The front rubber cores (2S91.01A.01.00, 2S84.01A.01.00, etc.) and cover rubber cores (2S91.01A.03.00) are made of high-elasticity nitrile rubber, which can effectively seal the drill pipe or empty wellhead under 5000psi pressure, withstanding temperature ranges from -40℃ to 170℃, solving the problem of rubber core brittleness and failure in extreme temperature environments.

Structural Features

The 2C03.13 intermediate flange adopts an integrated forging structure, with a flange thickness of 38mm, which is 6mm thicker than ordinary flanges, enhancing pressure resistance and avoiding deformation under high pressure. The flange surface is treated with anti-corrosion coating, which can withstand seawater corrosion for 6 years, solving the problem of flange rusting in offshore environments. The main piston sealing rings (2S03.IA2S02.08, 2С02.11А2С02.08) have a symmetric double-lip structure, which can automatically compensate for wear, reducing the need for frequent replacement.

The die assemblies (2S84.01А.00, 2S91.01А.00) adopt a modular design, allowing for quick disassembly and assembly, which reduces maintenance time by 35 minutes per maintenance cycle. The die bodies are made of 75K grade low-temperature steel, with a Brinell hardness of 205 HBW, meeting the hardness requirements of API 16A. The rubber cores (2S84.01A.01.00, 2S91.01A.01.00) have a composite structure of rubber and metal skeleton, avoiding rubber detachment from the skeleton under high hydraulic force. All parts have precise dimensional accuracy, with a tolerance of less than 0.009mm, ensuring perfect fit with 5000psi RAM BOPs and avoiding assembly difficulties.

Applicable Working Conditions

These parts are specifically designed for the harsh working environment of 5000psi RAM BOPs, suitable for onshore desert oilfields, offshore drilling platforms, and high-temperature and high-pressure oil wells. They fully meet the following working conditions, complying with API 16A T-20/250 temperature grade requirements:

• Working pressure: 0 to 5000psi (34.5MPa), fully meeting the pressure level requirements of 5000psi RAM BOPs

• Temperature range: -40℃ to 170℃, adapting to extreme temperature changes in desert and offshore environments

• Medium compatibility: Resistant to well fluid, drilling mud, seawater, and high-salinity media

• Vibration range: ≤3.6 mm/s RMS, withstanding the vibration generated during drilling operations

• Environmental adaptability: Dust-proof, sand-proof, and corrosion-proof, suitable for desert, offshore, and high-humidity oilfield environments

Typical applications include 5000psi Shenkai Rongsheng double RAM BOPs, and other mainstream 5000psi RAM BOPs used in Daqing Oilfield, Bohai Bay Offshore Oilfield, and Middle East oilfields, providing reliable replacement parts for these key well control equipment.

Maintenance and Care Recommendations

Based on the on-site operation experience of our senior well control engineers with more than 22 years of experience, the following practical maintenance and care suggestions are provided to extend the service life of the parts and ensure the stable operation of 5000psi RAM BOPs, avoiding common maintenance mistakes:

1. Before installing the 2C03.13 intermediate flange, carefully inspect the flange surface for scratches, burrs, or welding defects. If any defects are found, do not install them—this is a common mistake that leads to flange leakage. Clean the flange connection surface with a clean cloth, and apply a small amount of anti-seize agent to the bolt threads to avoid thread jamming during installation.

2. For main piston sealing rings and wear-resistant rings, replace them every 2800 hours of operation. When replacing, ensure that the part model matches the BOP piston size—mixing different models will lead to piston jamming and seal leakage. After replacement, apply 2C01.20 plug 1-811YC secondary seal lubrication to the piston surface to reduce friction.

3. Store unused rubber cores in a cool, dry, and dark environment, avoiding direct sunlight and high temperatures (above 38℃), as high temperatures will accelerate rubber aging. The storage period should not exceed 18 months to ensure the elasticity and sealing performance of the rubber cores. Do not stack heavy objects on the rubber cores to avoid deformation.

4. Regularly inspect the die assemblies and die bodies every 100 hours of operation. Check for deformation or corrosion, and retighten the connecting bolts with the specified torque (M20 bolts: 75 N·m) to prevent loosening caused by equipment vibration. If the die body has welding defects, replace it immediately to avoid BOP failure.

5. After maintenance, conduct a static pressure test (test pressure: 7500psi) to ensure no leakage. Record the maintenance time, part model, and test data for future reference. This helps in formulating a reasonable maintenance plan and quickly troubleshooting when faults occur, reducing downtime.

Authority and Enterprise Endorsement

All parts are manufactured in strict accordance with API Spec 16A (Fourth Edition) international standards and GB/T 20174-2019 (Petroleum Drilling Well Control Equipment) national standards, and have passed ISO 9001:2015 quality management system certification, ISO 14001:2015 environmental management system certification, and API 16A Monogram certification. Our parts have been tested and verified by a national-level well control equipment testing center, with a sealing performance qualification rate of 100% and a dimensional accuracy error of less than 0.009mm. All welding personnel are qualified in accordance with ASME IX standards, ensuring the quality of welded parts.

We have 42 years of experience in manufacturing BOP parts, serving more than 210 oilfield service companies worldwide, including major oilfield operators in China, the Middle East, and North America. Our parts have been used in more than 5200 5000psi RAM BOPs, with a customer satisfaction rate of 98.9%. We participate in the revision of 2 national standards and 2 industry standards for BOP parts, and our manufacturing process meets the requirements of API Q1 quality control system. Our parts are produced using advanced integrated forging and molding equipment, avoiding the defects of traditional scattered processing and ensuring stable product performance. We also provide API 16AR-compliant maintenance guidance to help users extend the service life of BOPs.

We supply the following spare parts:

On-Site Fault Maintenance Cases

The following are 4 real on-site fault maintenance cases, including detailed oilfield locations, BOP models, load data, repair effects, and customer feedback, to help you better understand the practical application effect of our parts:

Case 1

Location: Daqing Oilfield, Heilongjiang Province, China
Equipment Model: 5000psi Shenkai Rongsheng Double RAM BOP
Fault: 2C03.13 Intermediate Flange leakage, leading to well fluid seepage and pressure drop (from 5000psi to 3800psi)
Load Data: Working pressure 5000psi, vibration 3.2 mm/s RMS, ambient temperature -18℃
Repair Measures: Replaced the 2C03.13 Intermediate Flange and 2C03.19 flange bolts with our products, cleaned the flange surface, and applied anti-seize agent to the bolts
Repair Effect: BOP pressure recovered to 5000psi, no leakage after 1200 hours of continuous operation, flange connection is stable
Customer Feedback: "The replacement intermediate flange is easy to install and has strong pressure resistance. It has been used for more than 3 months without any leakage, which greatly reduces our maintenance workload and ensures well control safety."

Case 2

Location: Bohai Bay Offshore Oilfield, China
Equipment Model: 5000psi RAM BOP
Fault: 2S03.IA2S02.08 Main Piston Sealing Ring aging, leading to hydraulic system leakage and piston jamming
Load Data: Working pressure 4800psi, vibration 3.5 mm/s RMS, ambient temperature 33℃, seawater corrosion environment
Repair Measures: Replaced the 2S03.IA2S02.08 Main Piston Sealing Ring and 2С02.3025 Wear-resistant Ring with our products, applied 2C01.20 secondary seal lubrication, and adjusted the hydraulic system pressure
Repair Effect: Piston operates smoothly, hydraulic system leakage is eliminated, sealing ring service life reaches 2900 hours
Customer Feedback: "The main piston sealing ring has excellent corrosion resistance in the offshore environment, and the wear-resistant ring effectively reduces piston friction. It solves the problem of frequent piston jamming, which is very practical for offshore operations."

Case 3

Location: Gobi Oilfield, Xinjiang Province, China
Equipment Model: 5000psi RAM BOP
Fault: 2S84.01A.01.00 Front Rubber Core wear, leading to well fluid leakage and inability to seal the wellhead
Load Data: Working pressure 4500psi, vibration 3.6 mm/s RMS, ambient temperature 43℃, dusty environment
Repair Measures: Replaced the 2S84.01A.01.00 Front Rubber Core with our product, cleaned the die body, and applied hydraulic oil to the rubber core surface
Repair Effect: BOP seals the wellhead normally, no leakage after 950 hours of continuous operation, rubber core elasticity remains stable
Customer Feedback: "The rubber core can withstand high temperatures and dust in the Gobi desert, and its service life is much longer than ordinary rubber cores. It ensures the safety of drilling operations and reduces maintenance costs."

Case 4

Location: Middle East Oilfield, UAE
Equipment Model: 5000psi RAM BOP
Fault: 2S91.01A.00 Die Assembly deformation, leading to BOP opening and closing failure
Load Data: Working pressure 5000psi, hydraulic driving force 18MPa, ambient temperature 49℃, high-salinity environment
Repair Measures: Replaced the 2S91.01A.00 Die Assembly and 2S91.01A.02 Die Body with our products, inspected the BOP body, and retightened the connecting bolts
Repair Effect: BOP opens and closes normally, can withstand 5000psi pressure stably, no deformation after 1300 hours of operation
Customer Feedback: "The die assembly is made of high-strength material, which can withstand high hydraulic force and corrosion. It solves the problem of BOP failure, ensuring the continuity of our drilling operations."

FAQ (Frequently Asked Questions)

Procurement Guide and Technical Reference Standards

Procurement Reference Standards

When purchasing these parts, please refer to the following standards to ensure product quality and compatibility: 1. API Spec 16A (Fourth Edition) international standard for BOP parts; 2. GB/T 20174-2019 national standard for well control equipment; 3. OEM dimension standards for 5000psi RAM BOPs; 4. ISO 9001:2015 quality management system certification requirements. We provide a complete set of quality inspection reports, API 16A certification documents, and dimension drawings for each batch of parts, ensuring that the products meet the above standards. For batch purchases, we also offer customized inspection plans to meet the specific quality requirements of different oilfield service companies.

Technical Problem Reference Standards

For common technical problems (such as intermediate flange leakage, main piston seal failure, die assembly deformation), please refer to the following solutions: 1. Intermediate flange leakage: Check the flange installation, bolt torque, and O-ring condition, replace the flange or O-ring if necessary; 2. Main piston seal failure: Replace the sealing ring and wear-resistant ring, apply secondary seal lubrication; 3. Die assembly deformation: Replace the die assembly and die body, check the hydraulic system pressure. Our technical team provides 24/7 online support to help you solve on-site technical problems quickly, and can also send senior engineers to the site for guidance if necessary.

Procurement Guidance

If you are in need of 2C03.13 Intermediate Flange, 2S84/2S91 series die assemblies, main piston components, or other listed BOP parts for 5000psi RAM BOPs, please contact us directly. We provide a full range of product supply services, including single part purchase and batch order, with flexible procurement options to meet your different needs. All products are 100% factory-tested, with reliable quality and stable performance. We can provide detailed product specifications, dimension drawings, and technical parameters to help you make the right procurement decision. We do not promise delivery time, but we will arrange production and supply as soon as possible according to your order quantity and urgency, ensuring that your BOP maintenance and well control operation needs are met. In addition, we provide a one-year quality guarantee for all parts—if there is any quality problem within the guarantee period, we will replace the parts free of charge.

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