2S84.03.10 O-ring & 2S91 Series Sealing/Fastening Parts

Introduction

In the harsh and high-risk environment of oilfield drilling rigs, especially for Blowout Preventer (BOP) systems and mud pump components, the reliability of sealing and fastening parts directly determines the safety of drilling operations, equipment service life, and operational efficiency. The parts listed, including 2S84.03.10 O-ring, 2S91.03.05 Cylinder, 73.02×3.53 O-ring, and 2S85.03.09 AU-shaped sealing ring, are specifically designed as drop-in replacements for key oilfield equipment models such as Honghua ZJ30/ZJ40 drilling rigs, FZ18-35 BOPs, and BOMCO F-1600 mud pumps. These parts also feature full compatibility with Weatherford and Canrig drilling equipment, addressing the core pain points of oilfield maintenance teams—frequent leaks, short service life of wearing parts, difficult replacement, and high downtime costs.

Our target users include oilfield maintenance engineers, procurement managers of oilfield service companies, and equipment operation teams. For maintenance engineers, the key demand is parts that are easy to install, have stable performance, and can withstand extreme working conditions; for procurement managers, it is cost-effectiveness, reliable supply, and compliance with industry standards; for operation teams, it is minimizing equipment downtime and ensuring continuous and safe drilling operations. The core purpose of these parts is to provide a one-stop, high-reliability replacement solution for oilfield drilling rig BOP systems, hydraulic cylinders, and sealing assemblies, ensuring leak-proof, shock-resistant, and corrosion-resistant performance in harsh oilfield environments, reducing maintenance frequency and operational costs.

Product Overview

The product portfolio covers a full range of sealing and fastening components, including O-rings (2S84.03.10, 73.02×3.53, 43.7×3.55, 34.5×3.55), support sealing sleeves (2S84.03.11, 2S85.03.11), piston rod O-rings (2S84.03.25, 2S85.03.17), cylinders (2S91.03.05), pistons (2S91.03.06), and various fasteners (CB5780 M20x100 Screw, CB120 A16x60 Tapered pin). All parts are manufactured in strict accordance with API 682 international standards and JB/T 4127.1-2013 industry standards, with each part undergoing 100% pressure testing and dimensional inspection before leaving the factory. Our parts have a proven track record of 30,000 hours of continuous operation in medium-duty oilfield conditions, which is 15 times longer than ordinary replacement parts in the market, effectively solving the problem of frequent part replacement in oilfield operations.

Function Description

Sealing Components

The O-rings (including 2S84.03.10, 73.02×3.53, etc.) are made of high-quality FKM (fluororubber) material, which can effectively seal hydraulic oil, drilling mud, and other media, preventing leaks in high-pressure environments (up to 10.0 MPa) and high temperatures (up to 150℃)—a common pain point in oilfield operations where ordinary O-rings often fail due to harsh media corrosion. The support sealing sleeves (2S84.03.11, 2S85.03.11) provide stable support for O-rings and piston rod seals, avoiding seal deformation caused by equipment vibration, which is a major cause of seal failure in drilling rigs with high vibration levels (up to 4.5 mm/s RMS).

The AU-shaped sealing ring (2S85.03.09) and piston rod O-rings (2S84.03.25, 2S85.03.17) are designed for reciprocating motion components such as hydraulic cylinders, featuring low friction and high wear resistance, ensuring smooth operation of piston rods and preventing oil leakage from the rod end. The sponge sealing ring (2F218700VT8.03.22-00) and its cover (2F21870OVT8.03-23) are used for dust and water protection of equipment joints, preventing external pollutants from entering the internal components and extending the service life of core parts by 5,000 hours on average.

Fastening Components

The CB5780 M20x100 Screw and CB120 A16x60 Tapered pin are made of high-strength alloy steel, with a tensile strength of 10.9 grade, which can withstand the high vibration and impact loads of oilfield drilling rigs (up to 200 kN). The double-head bolt (2S91.03.13) and cover nut (2S91.03.14) are designed with anti-loosening threads, solving the problem of bolt loosening caused by long-term equipment vibration—a common issue that leads to equipment failure and safety hazards. The side door bolts (2S91.07, 2S84.06) and hinged pedestals (2S91.05, 2S91.06) are specially designed for BOP side doors, ensuring tight sealing and easy opening and closing, improving maintenance efficiency.

Structural Features

All sealing components adopt an integrated molding structure, with a sealing surface flatness tolerance of no more than 0.0009mm (0.9 microns), in line with JB/T 4127.1-2013 standards, ensuring tight fit and no leakage. The O-rings are designed with optimized cross-sectional dimensions, which can automatically compensate for wear during use, reducing the need for frequent replacement. The support sealing sleeves are made of wear-resistant stainless steel, with a surface roughness of Ra ≤3.2μm, avoiding scratches on piston rods and extending the service life of both the sleeve and the piston rod.

The fastening components feature a heat-treated surface, with a corrosion-resistant coating that can withstand the corrosive environment of oilfield mud and seawater (for offshore drilling rigs), ensuring no rusting or deformation for 8 years. The hinged pedestals (2S91.05, 2S91.06) adopt a modular design, allowing for quick disassembly and assembly, which reduces maintenance time by 40 minutes per maintenance cycle compared to traditional components. The dust ring (2S84.03.19) and its pedestal (2S84.03.18) have a multi-layer dust-proof structure, effectively blocking dust, sand, and other particles from entering the equipment, which is crucial for extending the service life of hydraulic components in desert oilfields.

Applicable Working Conditions

These parts are specifically designed for harsh oilfield drilling environments, including onshore desert oilfields, offshore drilling platforms, and high-temperature and high-pressure oil wells. They are fully compatible with the following working conditions:

• Temperature range: -40℃ to 150℃, adapting to extreme temperature changes in desert and offshore environments

• Pressure range: 0 to 10.0 MPa, meeting the high-pressure requirements of BOP systems and mud pumps

• Vibration range: ≤4.5 mm/s RMS, complying with API 610 standards for pump vibration

• Medium compatibility: Resistant to hydraulic oil, drilling mud, seawater, and weak corrosive media

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

Typical applications include Honghua ZJ30/ZJ40 drilling rig BOP systems, BOMCO F-1600 mud pumps, Weatherford hydraulic cylinders, and Canrig drilling equipment, providing reliable replacement parts for these key oilfield equipment.

Maintenance and Care Recommendations

Based on years of on-site maintenance experience of our senior engineers, the following practical maintenance and care suggestions are provided to extend the service life of the parts and ensure stable operation:

1. Before installation, carefully inspect the surface of the parts for scratches, burrs, or damage. If any defects are found, do not install them—this is a common mistake that leads to early seal failure. Use a soft cloth to clean the installation surface and apply a small amount of EM-09-1 Secondary Seal Lubrication to the sealing surface to avoid dry friction during installation.

2. For O-rings and other sealing components, store them in a cool, dry, and dark environment, avoiding direct sunlight and high temperatures (above 40℃), as high temperatures can accelerate the aging of rubber materials. The storage period should not exceed 2 years to ensure the elasticity and sealing performance of the seals.

3. Regularly inspect the fastening components (screws, bolts, nuts) during equipment operation. Check for looseness every 100 hours of operation and retighten them with the specified torque (M20 screws: 80 N·m; tapered pins: 50 N·m) to prevent equipment failure caused by bolt loosening.

4. For sealing components in mud pump cylinders and BOP systems, replace them every 3,000 hours of operation (or earlier if leaks are found). When replacing, use the same model of parts to ensure compatibility and sealing performance—mixing different models of seals will lead to leaks and equipment damage.

5. After maintenance, conduct a pressure test (test pressure: 1.2 times the working pressure) to ensure no leaks. Record the maintenance time and part model for future reference, which helps in formulating a reasonable maintenance plan and reducing unexpected downtime.

Authority and Enterprise Endorsement

All parts are manufactured in accordance with API 682 (Petroleum, Petrochemical and Natural Gas Industry Centrifugal and Rotor Pump Shaft Seal Systems) and JB/T 4127.1-2013 (Mechanical Seals - Part 1: Technical Conditions) standards, and have passed ISO 9001:2015 quality management system certification, ISO 14001:2015 environmental management system certification, and ISO 45001:2018 occupational health and safety management system certification. Our parts have been tested and verified by a national-level industrial seal testing center, with a sealing performance qualification rate of 100% and a dimensional accuracy error of less than 0.01mm.

We have 38 years of experience in manufacturing oilfield sealing and fastening parts, serving more than 200 oilfield service companies worldwide, including major oilfield operators in the Middle East, North America, and Southeast Asia. Our parts have been used in more than 5,000 oilfield drilling rigs, with a customer satisfaction rate of 98.6%. We also participate in the formulation of 3 national standards and 3 industry standards for industrial seals, demonstrating our authority and influence in the industry.

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, equipment 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: Honghua ZJ30 drilling rig, FZ18-35 BOP
Fault: 2S84.03.10 O-ring leakage in BOP hydraulic cylinder, leading to hydraulic system pressure drop (from 8 MPa to 5 MPa)
Load Data: Working pressure 8 MPa, vibration 3.2 mm/s RMS, ambient temperature -15℃
Repair Measures: Replaced the damaged 2S84.03.10 O-ring with our product, cleaned the sealing surface, and applied EM-09-1 Secondary Seal Lubrication
Repair Effect: Hydraulic system pressure recovered to 8 MPa, no leakage after 1,200 hours of continuous operation
Customer Feedback: "The replacement O-ring is easy to install and has stable performance. It has been used for more than 3 months without any leakage, which greatly reduces our maintenance workload and downtime."

Case 2

Location: Bohai Bay Offshore Oilfield, China
Equipment Model: Weatherford BOP system, 2S91.03.05 Cylinder
Fault: Cylinder piston O-ring (2S91.03.12) wear, leading to oil leakage and piston stuck
Load Data: Working pressure 10 MPa, vibration 4.0 mm/s RMS, ambient temperature 35℃, seawater corrosion environment
Repair Measures: Replaced 2S91.03.12 Piston O-ring and inspected the cylinder inner wall, replaced the damaged support sealing sleeve (2S84.03.11)
Repair Effect: Piston operates smoothly, no oil leakage, cylinder service life extended by 3,000 hours
Customer Feedback: "The parts have excellent corrosion resistance in the offshore environment, and the installation is quick. It solves the problem of frequent O-ring replacement in seawater environments, which is very practical."

Case 3

Location: Gobi Oilfield, Xinjiang Province, China
Equipment Model: BOMCO F-1600 mud pump, 73.02×3.53 O-ring
Fault: 73.02×3.53 O-ring in mud pump valve cover leaked, leading to mud loss and reduced pump efficiency (from 90% to 75%)
Load Data: Working pressure 9 MPa, vibration 4.2 mm/s RMS, ambient temperature 45℃, dusty environment
Repair Measures: Replaced the 73.02×3.53 O-ring with our product, installed a sponge sealing ring cover (2F21870OVT8.03-23) to enhance dust protection
Repair Effect: Mud pump efficiency recovered to 90%, no leakage after 800 hours of continuous operation, dust-proof effect significantly improved
Customer Feedback: "The O-ring can withstand high temperatures and dust in the Gobi desert, and the dust-proof cover effectively prevents sand from entering the valve cover. It has saved us a lot of maintenance costs."

Case 4

Location: Permian Basin, Texas, USA
Equipment Model: Canrig drilling rig, 2S91.03.04 Locking shaft
Fault: Locking shaft O-ring (2S91.03.16) aging and cracking, leading to locking failure and equipment shutdown
Load Data: Working pressure 7 MPa, vibration 3.8 mm/s RMS, ambient temperature 28℃
Repair Measures: Replaced 2S91.03.16 O-ring for locking shaft and checked the locking shaft surface, retightened the double-head bolt (2S91.03.13) with specified torque
Repair Effect: Locking shaft operates normally, equipment resumes operation, no failure after 1,500 hours of operation
Customer Feedback: "The replacement parts are fully compatible with our Canrig drilling rig, and the service life is longer than the original parts. It ensures the safety and 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 682 international standard for sealing components; 2. JB/T 4127.1-2013 industry standard for mechanical seals; 3. GB/T 3098.1 standard for fasteners (tensile strength 10.9 grade); 4. Original equipment manufacturer (OEM) dimension standards for compatibility verification. We provide a complete set of quality inspection reports and certification documents for each batch of parts, ensuring that the products meet the above standards.

Technical Problem Reference Standards

For common technical problems (such as seal leakage, bolt loosening, piston jamming), please refer to the following solutions: 1. Seal leakage: Check the seal model, installation surface, and working pressure, replace the seal if necessary; 2. Bolt loosening: Retighten with specified torque, check for thread damage; 3. Piston jamming: Check the piston O-ring wear and cylinder inner wall condition, replace worn parts. Our technical team provides 24/7 online support to help you solve on-site technical problems quickly.

Procurement Guidance

If you are in need of 2S84.03.10 O-ring, 2S91 series parts, or other listed sealing and fastening components for oilfield drilling rigs, 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 equipment maintenance and operation needs are met.

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