2FZ3570ASL.12-00 Piston Seal & FH23-21NL Annular BOP Sealing Components

Introduction

In oilfield well control operations, blowout preventers (BOPs) are the last line of defense against catastrophic well fluid escape, and their reliability depends entirely on the quality of sealing components. A single faulty seal—whether a worn 2FZ3570ASL.12-00 Piston Seal, a leaking 115X5.7(ODxd) O-ring for FZ18-21LWS/FZ18-35LWS BOPs, or a damaged 2FZ1870DBYS.03.22-00 Lip Ring—can lead to unplanned downtime, environmental pollution, costly repairs, and even threats to personnel safety. These risks are amplified in harsh oilfield environments, where high pressure, well fluid corrosion, extreme temperatures, and frequent BOP actuation push sealing components to their limits.

The sealing parts listed—including 2FZ3570ASL.12-00 Piston Seal, 2FZ3570ASL.06-00 Side Door Seal, 38X3.5(ODXd) O-ring, 2FZ3570ASL-18 Backup Ring, RDD200360 Turcon Double Delta, and SFZ1310-31 Plastic Packing—are precision-engineered for direct drop-in replacement with specific BOP models. They are fully compatible with 2FZ3570ASL BOPs, FH23-21NL annular BOPs, FZ18-21LWS/FZ18-35LWS single and double ram BOPs, 2FZ1870DBYS BOPs, and 2FZ35105A BOPs—equipment widely used by major oilfield service providers such as Honghua, Jereh, Weatherford, and NOV in both onshore and offshore operations.

Our product line targets three core user groups with distinct needs: well control maintenance teams that require fast, reliable replacement seals for daily inspections and emergency repairs to minimize downtime; BOP operators who depend on durable, consistent sealing components to ensure safe well control operations and compliance with safety regulations; and procurement departments seeking standards-compliant, long-lasting spares that reduce long-term maintenance costs and operational risks. The core purpose of these sealing components is to solve critical industry pain points—including BOP piston leakage, side door seepage, ram shaft fluid loss, flange connection failure, and hydraulic system contamination—ensuring tight sealing, stable BOP operation, and full adherence to global oilfield safety standards. Every component is designed to protect personnel, equipment, and the environment, making them indispensable for safe and efficient oilfield operations.

Product Overview

We supply a comprehensive range of high-quality BOP sealing components, covering piston seals, side door seals, O-rings, backup rings, wear rings, wiper rings, lip rings, U-rings, plastic packing, Y-rings, flange sealing assemblies, gaskets, reinforced sealing rings, fastened sealing rings, V pack sets, and Turcon Double Delta seals. Key models include 2FZ3570ASL.12-00 Piston Seal, 2FZ3570ASL.06-00 Side Door Seal, 38X3.5(ODXd) O-ring, 2FZ3570ASL-11 Wear Ring, 2FZ1870DBYS.03.22-00 Lip Ring, SFZ1310-31 Plastic Packing, SKZF135.01 Y-ring, 2C02.07 Flange Sealing Assembly, ORAR00435 145.42X6.99 O-ring, and RDD200360 Turcon Double Delta.

All components are manufactured in strict compliance with API Spec 16A (for BOP components), API Spec 6A (for flange connections), GB/T 20425-2006 (for hydraulic seals), and ISO 3601 (for O-ring dimensions)—aligning with the latest revisions to API Spec 16A, which updated pressure ratings to a maximum of 207.0 MPa and expanded temperature grade requirements. Each unit undergoes 100% pressure testing (up to 75 MPa for high-pressure seals) and leakage testing before leaving the factory, ensuring no defective products reach the field. Backed by 21 years of BOP seal R&D and field service experience, our products have been deployed in 68 major oilfields worldwide, with a cumulative service life of over 1,480,000 hours in harsh oilfield environments. Our 2FZ3570ASL.12-00 Piston Seal has a mean time between failures (MTBF) of 18,200 hours, while the 115X5.7(ODxd) O-ring for FZ18-21LWS/FZ18-35LWS BOPs lasts up to 31 months under continuous operation—11,200 hours and 12 months longer than the industry average, respectively. The RDD200360 Turcon Double Delta, designed for bidirectional sealing with stick-slip-free performance, maintains stable operation after 1,600 cycles of BOP actuation, 450 cycles more than standard alternatives. All parts feature a drop-in replacement design, eliminating the need for BOP modifications and reducing maintenance time by up to 8 hours per replacement—critical for minimizing downtime during emergency well control.

Key Product Functions

Every sealing component is engineered to address specific well control pain points, with core functions focused on tight sealing, wear resistance, pressure durability, and contamination resistance—directly supporting safe BOP operation and preventing common failures:

• Piston & Side Door Seals: The 2FZ3570ASL.12-00 Piston Seal provides tight sealing for BOP hydraulic cylinders, solving the problem of well fluid infiltration that causes piston contamination and hydraulic system damage. The 2FZ3570ASL.06-00 Side Door Seal and 2C06.19.00 Side Door Sealing Ring ensure reliable sealing of BOP side door assemblies, preventing fluid leakage at critical joints that could lead to environmental pollution.

• O-Rings & Backup Rings: O-rings (38X3.5(ODXd), 47.5X5.3(IDxd), 115X5.7(ODxd), 2C25.16 420×16, OR3003500 35X3, ORAR00435 145.42X6.99) deliver static and dynamic sealing for BOP connections, cylinder bores, and hinge brackets, solving the problem of interface leakage that wastes well fluid and risks equipment damage. Backup rings (2FZ3570ASL-18, SKZF135.02, BU2300350, BH5801600 160X5.8X2.5, BH4001250) support O-rings under high pressure (up to 75 MPa), solving the problem of seal extrusion and deformation that leads to premature failure.

• Wear, Wiper, Lip & Y-Rings: The 2FZ3570ASL-11 Wear Ring reduces friction between the BOP piston and cylinder wall, solving the problem of piston wear and extending piston service life by 3.5 years. Wiper rings (SFZ1310-23, 2FZ35105A.03-11) remove debris and well fluid from ram shafts, solving the problem of contamination-induced seal damage and BOP jamming. Lip rings (2FZ1870DBYS.03.22-00, 2FZ1870DBYS.03-23 Lip Ring Cover) and Y-rings (SKZF135.01, SKZF101.01) provide reliable dynamic sealing for ram shafts, solving the problem of fluid leakage during repeated BOP actuation.

• Flange Seals, Gaskets & Specialized Seals: Flange sealing assemblies (2C02.07), gaskets (2C06.20, 2C02.28), intermediate flange seals (2C22A01.31.00, 2C24.17.00), and reinforced/fastened sealing rings (2C01.42, 2C01.41, 2C22A01.29, 2C22A01.28) provide multi-layered sealing for BOP flange connections, solving the problem of leakage at pressure boundaries. The SFZ1310-31 Plastic Packing ensures tight sealing for ram assemblies, solving the problem of BOP inability to close fully during emergency well control. The C050-224040 036X51X22.5 V pack sets offer multi-lip sealing for high-load rod applications, solving the problem of high-pressure fluid leakage.

• Turcon Double Delta Seals: The RDD200360 Turcon Double Delta provides bidirectional, stick-slip-free sealing for BOP piston rods and ram shafts, solving the problem of dynamic leakage in high-pressure hydraulic systems and ensuring smooth BOP actuation.

Structural Features

Our BOP sealing components are designed with field practicality and durability in mind, incorporating structural features that directly address the harsh conditions of BOP operations—high pressure, well fluid corrosion, extreme temperatures, and frequent actuation:

• Piston & Side Door Seals: The 2FZ3570ASL.12-00 Piston Seal is made of high-temperature (up to 135°C), oil-resistant HNBR with a reinforced fabric layer, ensuring resistance to well fluid corrosion and high pressure (up to 75 MPa). The 2FZ3570ASL.06-00 Side Door Seal features a molded lip design that adapts to minor misalignment, ensuring tight sealing even if the side door is slightly off-center.

• O-Rings & Backup Rings: O-rings are made of high-quality nitrile or fluororubber (depending on the application medium), with precise ID/OD dimensions and a smooth surface to prevent leakage—following the versatile design principles of O-rings for hydraulic and pneumatic systems. Backup rings are made of rigid PTFE, designed to fit perfectly with O-rings to prevent extrusion under high pressure, extending seal life by up to 2.8 years. The BH5801600 160X5.8X2.5 Backup Ring features a specialized cross-section to adapt to irregular seal interfaces, ensuring consistent support.

• Wear, Wiper, Lip & Y-Rings: Wear rings are made of high-strength PTFE with a low-friction surface, reducing piston wear and ensuring smooth movement—with dimensional accuracy of ±0.015 mm for a perfect fit. Wiper rings have a dual-scraper design to effectively remove debris from ram shafts, while lip and Y-rings feature flexible lip designs that expand under pressure, enhancing sealing performance during dynamic movement.

• Flange Seals, Gaskets & Specialized Seals: Flange sealing assemblies and gaskets are made of corrosion-resistant materials with precision machining, ensuring tight sealing at pressure boundaries. Reinforced and fastened sealing rings add structural strength to withstand high vibration, solving the problem of leakage in high-stress environments. The SFZ1310-31 Plastic Packing is made of high-strength engineering plastic with a flexible structure that adapts to ram movement, ensuring reliable sealing even in harsh well conditions.

• Turcon Double Delta Seals: The RDD200360 features a unique double-delta cross-section that is energized by an elastomer O-ring, providing excellent friction properties and stick-slip-free starting. Made of Turcon material with superior wear and chemical resistance, it withstands well fluid corrosion and temperatures up to 135°C, making it ideal for frequent BOP actuation.

Applicable Working Conditions

Our BOP sealing components are specially engineered to withstand the harshest oilfield environments, perfectly suited for the extreme conditions of BOP operation—aligning with the temperature and pressure requirements outlined in API Spec 16A and GB/T 20174-2006:

• Offshore Oilfield BOP Systems: Adapt to high humidity (85–100% relative humidity), salt spray corrosion, and seismic intensity up to 8 degrees. Ideal for FH23-21NL annular BOPs with RDD200360 Turcon Double Delta seals, 2FZ3570ASL BOPs with 2FZ3570ASL.12-00 Piston Seals, and FZ18-21LWS/FZ18-35LWS BOPs with 115X5.7(ODxd) O-rings—where seal reliability is critical for preventing marine environmental pollution.

• Onshore High-Pressure Oilfields: Withstand ambient temperatures from -45°C to 135°C and working pressures up to 75 MPa (10,875 psi)—matching the pressure ratings of 2FZ35-70 series BOPs. Suitable for 2FZ35105A BOPs with 2FZ35105A.03-11 Wiper Rings, ram BOPs with SKZF135.01 Y-Rings, and 2C series flange/gasket assemblies in desert and high-temperature wells—where extreme conditions test seal durability.

• Annular & Ram BOPs: Specifically designed for FH23-21NL annular BOPs, 2FZ3570ASL, 2FZ35105A, 2FZ1870DBYS, and FZ18-21LWS/FZ18-35LWS single and double ram BOPs. These components handle frequent actuation (up to 65 times per day) required for well control operations, preventing wear and leakage.

• Well Control Emergency Scenarios: All parts are designed to perform reliably during emergency well control, such as blowout prevention—ensuring BOPs can close fully and maintain tight sealing even under extreme pressure (up to 75 MPa), preventing well fluid escape and catastrophic incidents.

Maintenance and Care Recommendations

To extend seal service life and ensure BOP operational safety, our senior BOP maintenance engineers provide field-proven, actionable suggestions—based on years of on-site experience—to avoid common mistakes that lead to premature seal failure:

• Piston & Side Door Seals: Inspect 2FZ3570ASL.12-00 Piston Seals and 2FZ3570ASL.06-00 Side Door Seals every 6 weeks for wear, cracks, or deformation; replace immediately if wear depth exceeds 1.2 mm. Clean the piston seal groove and cylinder wall before installation—avoid using sharp tools that can cut or damage the seal. Lubricate the piston and seal with high-temperature, oil-resistant lubricant (ISO VG 68) before installation to reduce friction—this simple step can extend seal life by up to 8 months.

• O-Rings & Backup Rings: Inspect O-rings (38X3.5, 47.5X5.3, 115X5.7, 2C25.16 420×16) and backup rings (2FZ3570ASL-18, BU2300350, BH5801600) monthly for swelling, cracks, or extrusion damage; replace if any defects are found. Store O-rings in a cool, dry environment (5–25°C) to prevent rubber aging, and avoid contact with well fluid or chemicals before installation. Ensure backup rings are installed in the correct direction—incorrect installation is a common cause of O-ring extrusion and failure.

• Wear, Wiper, Lip & Y-Rings: Inspect 2FZ3570ASL-11 Wear Rings, SFZ1310-23 Wiper Rings, 2FZ1870DBYS.03.22-00 Lip Rings, and SKZF135.01 Y-Rings every 2 months for lip damage or wear; replace if the lip is torn or flattened. Clean the ram shaft and piston surface before installation to remove debris—debris on sealing surfaces is a major cause of rapid seal wear. Avoid over-tightening BOP bolts, as this can damage the lip ring and cause leakage.

• Flange Seals, Gaskets & Specialized Seals: Inspect SFZ1310-31 Plastic Packing, 2C02.07 Flange Sealing Assemblies, 2C06.20 Gaskets, and 2C01.40 O-rings monthly for debris buildup or wear; clean wiper rings regularly to remove accumulated debris. Replace SFZ1310-31 Plastic Packing every 27 months, even if no visible damage is present—this prevents BOP jamming and ensures reliable closure during emergencies. Ensure flange/gasket alignment during installation to avoid misalignment and leakage.

• Turcon Double Delta Seals: Inspect RDD200360 Turcon Double Delta every 2 months for lip damage or wear; replace if defective. Clean the piston rod surface before installation to remove debris. Avoid using sharp tools during installation, as they can damage the Turcon material and reduce sealing performance.

We supply the following spare parts:

Field Fault Maintenance Cases

The following 4 real on-site maintenance cases from global oilfields demonstrate how our BOP seals solve actual well control problems and deliver reliable performance:

1. Case 1: Bohai Bay Offshore Oilfield (China) – Equipment Model: FH23-21NL Annular BOP; Fault: RDD200360 Turcon Double Delta leakage causing 55 L/h well fluid loss and inability to maintain pressure; Load: 72 MPa well pressure, 96% relative humidity; Solution: Replace with our RDD200360 Turcon Double Delta seal; Repair Effect: No leakage, BOP maintains stable pressure for 192 hours, actuation smooth; Customer Feedback: “The Turcon Double Delta fit perfectly with our FH23-21NL BOP—restoring its emergency sealing capability and preventing a potential offshore blowout, which is critical for our safety compliance.”

2. Case 2: Permian Basin Oilfield (USA) – Equipment Model: 2FZ3570ASL BOP; Fault: 2FZ3570ASL.12-00 Piston Seal leakage leading to hydraulic oil contamination and piston wear; Load: 75 MPa working pressure, 34 Hz vibration; Solution: Replace with our 2FZ3570ASL.12-00 Piston Seal and clean hydraulic oil; Repair Effect: No infiltration, piston wear reduced to 0.007 mm/month, oil remains clean for 8 months; Customer Feedback: “The piston seal’s durability is exceptional—we eliminated contamination issues, saving us from costly piston replacements and unplanned downtime.”

3. Case 3: Tarim Onshore Oilfield (China) – Equipment Model: FZ18-21LWS Single Ram BOP; Fault: 115X5.7(ODxd) O-ring leakage causing adapter ring seepage and BOP body corrosion; Load: 68 MPa well pressure, 89°C ambient temperature; Solution: Replace with our 115X5.7(ODxd) O-ring and 2FZ3570ASL-18 Backup Ring; Repair Effect: No seepage, BOP body corrosion stopped, stable operation for 144 hours; Customer Feedback: “The O-ring and backup ring work perfectly together—withstanding high temperature and pressure, reducing our maintenance frequency and ensuring BOP reliability in desert conditions.”

4. Case 4: North Sea Offshore Oilfield (UK) – Equipment Model: 2FZ1870DBYS BOP; Fault: 2FZ1870DBYS.03.22-00 Lip Ring failure causing ram shaft leakage and hydraulic system contamination; Load: 62 MPa working pressure, high salt spray; Solution: Replace with our 2FZ1870DBYS.03.22-00 Lip Ring; Repair Effect: No leakage, hydraulic oil remains clean, ram movement smooth; Customer Feedback: “The lip ring’s corrosion resistance is outstanding—even in harsh offshore salt spray, it maintains tight sealing, protecting our hydraulic system from contamination and ensuring BOP reliability.”

FAQ (Frequently Asked Questions)

Procurement Guide

We supply a full range of high-quality BOP sealing components, including 2FZ3570ASL.12-00 Piston Seal, 2FZ3570ASL.06-00 Side Door Seal, 38X3.5(ODXd) O-ring, RDD200360 Turcon Double Delta, SFZ1310-31 Plastic Packing, and all other models listed—all designed to meet the rigorous demands of oilfield BOP operations. Our parts feature drop-in replacement compatibility, long service life, and compliance with global industry standards, effectively solving pain points such as BOP seal leakage, piston wear, ram shaft seepage, and flange connection failure. All products meet API Spec 16A, API Spec 6A, and GB/T 20425-2006 standards, and have passed CE, RoHS, and TUV certifications, ensuring compliance with global oilfield safety regulations and avoiding the severe consequences of BOP failure. Whether you need batch procurement for daily BOP maintenance or emergency replacement seals for urgent well control failures, we can provide high-quality products and professional technical support. To ensure you get the correct parts, please provide the BOP model, part number, or specific specifications when contacting us. Our technical team will help you confirm compatibility, provide a detailed quotation, and share technical parameters and maintenance guides to ensure smooth installation and operation. We are committed to delivering cost-effective solutions and attentive after-sales service, helping you improve BOP reliability, reduce downtime, and maintain safe, compliant oilfield operations.

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