2FZ3570ASL.12-00 Piston Seal & 2FZ2835ALWS BOP Sealing Components

Introduction

In oilfield well control operations, blowout preventers (BOPs) are the critical safety barrier that prevents well fluid escape and protects personnel, equipment, and the environment. The reliability of BOPs depends entirely on the quality of their sealing components—even a small faulty part, such as a worn 2FZ3570ASL.12-00 Piston Seal, a leaking FW1305-09 O-ring for FZ18-21LWS/FZ18-35LWS BOPs, or a damaged 2FZ2835ALWS.03.02.04-00 Piston Seal, can lead to unplanned downtime, costly repairs, environmental pollution, and even catastrophic well control incidents. These risks are heightened 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, 2FZ2835ALWS.03.02.04-00 Piston Seal, FW1305-09 O-ring, H24 series adapter seals, FHZ5414 series bonnet/piston seals, SKZF133.01 Y-ring, and EM-09-1 Plastic Packing—are precision-engineered for direct drop-in replacement with specific BOP models. They are fully compatible with 2FZ3570ASL BOPs, 2FZ2835ALWS BOPs, 2FZ2870ASL BOPs, FZ18-21LWS/FZ18-35LWS single and double ram BOPs, and FHZ5414 series BOPs—equipment widely used by major oilfield service providers such as Honghua, Jereh, Weatherford, and NOV in both onshore and offshore operations. These components also align with the working pressure and temperature requirements of 2FZ35-70 series BOPs, which operate at 70MPa working pressure and -29℃ to 121℃ temperature ranges.

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, adapter ring misalignment, outer sleeve leakage, 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, adapter rings, wear rings, wiper rings, lip rings, dust rings, U-seals, packing, Y-rings, backup rings, and plastic packing. Key models include 2FZ3570ASL.12-00 Piston Seal, 2FZ2835ALWS.03.02.04-00 Piston Seal, 85X5.7 (ODxd) O-ring, FW1305-09 O-ring (for FZ18-21LWS/FZ18-35LWS), H24.11 Seal-Shell Upper, FHZ5414-08 Top Cover Inner Sealing Ring, SKZF133.01 Y-ring, EM-09-1 Plastic Packing, and 2FZ2870ASL.03.02-00 Side Door Seal.

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 the highest rated pressure to 207.0 MPa and adjusted the metal material minimum temperature grade to T-350. Each unit undergoes 100% pressure testing (up to 70 MPa, matching the working pressure of 2FZ35-70 series BOPs) and leakage testing before leaving the factory, ensuring no defective products reach the field. Backed by 22 years of BOP seal R&D and field service experience, our products have been deployed in 72 major oilfields worldwide, with a cumulative service life of over 1,560,000 hours in harsh oilfield environments. Our 2FZ3570ASL.12-00 Piston Seal has a mean time between failures (MTBF) of 19,800 hours, while the FW1305-09 O-ring for FZ18-21LWS/FZ18-35LWS BOPs lasts up to 33 months under continuous operation—12,500 hours and 13 months longer than the industry average, respectively. The SKZF133.01 Y-ring, designed for ram shaft sealing, maintains stable performance after 1,750 cycles of BOP actuation, 500 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 9 hours per replacement—critical for minimizing downtime during emergency well control. Each component also comes with a certificate of conformity (CoC) confirming compliance with API 16A requirements.

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 and 2FZ2835ALWS.03.02.04-00 Piston Seals provide tight sealing for BOP hydraulic cylinders, solving the problem of well fluid infiltration that causes piston contamination and hydraulic system damage. The 2FZ2870ASL.03.02-00 Side Door Seal ensures reliable sealing of BOP side door assemblies, preventing fluid leakage at critical joints that could lead to environmental pollution.

• O-Rings & Adapter Rings: O-rings (85X5.7, 53×5.3, 25×2.65, 31.5X3.55, FW1305-07, FW1305-09, FHZ5414-09, SKF14-190-06.07, SKF14-190-06.10, H27.08, 2FZ3570ASL-13, SFZ1310-14) deliver static and dynamic sealing for BOP connections, cylinder heads, outer sleeves, and bonnets, solving the problem of interface leakage that wastes well fluid and risks equipment damage. Adapter rings (H24.07, H24.05.00, H24.09, H24.10.00) ensure proper alignment of O-rings, solving the problem of O-ring misalignment and leakage—critical for BOP adapter assembly integrity.

• Wear, Wiper & Dust Rings: Wear rings (H24.13, H24.17, SKF14-190-06.09, SKF14-190-06.08, 2FZ3570ASL-11) reduce friction between BOP shells, pistons, and outer sleeves, solving the problem of component wear and extending service life by 4 years. Wiper rings (2FZ2835ALWS.03.14-05, 2FZ2835ALWS.03.02-03, 2FZ3570ASL.16-05) and dust rings (SFZ1310-23) remove debris and well fluid from ram shafts, solving the problem of contamination-induced seal damage and BOP jamming.

• Lip, Y, U-Seals & Packing: Lip rings (2FZ2835ALWS.03.02-06, 2FZ3570ASL.16.03-00) provide reliable dynamic sealing for ram shafts, solving the problem of fluid leakage during repeated BOP actuation. Y-rings (SKZF133.01) and backup rings (SKZF133.02) deliver high-pressure sealing for ram shafts, solving the problem of seal extrusion under extreme pressure. U-seals (SFZ1310-13) offer flexible rod sealing, while packing (2FZ2835ALWS.03.14.03-00) and plastic packing (EM-09-1) ensure tight sealing for ram assemblies, solving the problem of BOP inability to close fully during emergency well control.

• Bonnet, Piston & Outer Sleeve Seals: FHZ5414-08 Top Cover Inner Sealing Ring, FHZ5414-15 Piston Seal, and FHZ5414-12 Outer Body Sleeve Seal provide multi-layered sealing for BOP bonnets, pistons, and outer sleeves, solving the problem of leakage at pressure boundaries. H27.07 Top Cover Inner Sealing Ring, H27.11 Piston Upper Seal, and H27.13 Piston Lower Seal ensure reliable sealing for BOP upper and lower piston assemblies, preventing fluid leakage and contamination.

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 (up to 70MPa), well fluid corrosion, extreme temperatures (-29℃ to 121℃), and frequent actuation:

• Piston & Side Door Seals: The 2FZ3570ASL.12-00 and 2FZ2835ALWS.03.02.04-00 Piston Seals are made of high-temperature, oil-resistant HNBR with a reinforced fabric layer, ensuring resistance to well fluid corrosion and high pressure (up to 70 MPa)—matching the working pressure of 2FZ35-70 series BOPs. The 2FZ2870ASL.03.02-00 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 & Adapter Rings: O-rings are made of high-quality nitrile or fluororubber (depending on the application medium), with precise ID/OD dimensions (following GB/T 3452.1 standards for cross-section sizes) and a smooth surface to prevent leakage. Adapter rings (H24 series) are made of corrosion-resistant steel, with precision machining to ensure O-ring alignment—preventing O-ring misalignment, a common cause of seal failure. The H24.07 O-Ring Adapter Ring O.D. and H24.05.00 Seal Adapter Ring I.D. work together to ensure perfect O-ring positioning.

• Wear, Wiper & Dust Rings: Wear rings are made of high-strength PTFE with a low-friction surface, reducing component wear and ensuring smooth movement—with dimensional accuracy of ±0.012 mm for a perfect fit. Wiper rings have a dual-scraper design to effectively remove debris from ram shafts, while dust rings (SFZ1310-23) feature a flexible lip that prevents dust and debris from entering the BOP interior.

• Lip, Y, U-Seals & Packing: Lip rings feature a flexible lip design that expands under pressure, enhancing sealing performance during dynamic movement. Y-rings (SKZF133.01) are made of high-wear fluororubber, with a backup ring (SKZF133.02) to prevent extrusion under high pressure. U-seals (SFZ1310-13) offer low-friction sealing, while packing (2FZ2835ALWS.03.14.03-00) and plastic packing (EM-09-1) are made of high-strength materials that adapt to ram movement, ensuring reliable sealing even in harsh well conditions.

• Bonnet, Piston & Outer Sleeve Seals: FHZ5414 and H27 series seals are made of corrosion-resistant materials with precision machining, ensuring tight sealing for BOP bonnets, pistons, and outer sleeves. They feature a multi-layered design that withstands well fluid corrosion and high pressure, ensuring long-term reliability in offshore and onshore environments.

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 2FZ3570ASL BOPs with 2FZ3570ASL.12-00 Piston Seals, 2FZ2835ALWS BOPs with 2FZ2835ALWS.03.02.04-00 Piston Seals, and FZ18-21LWS/FZ18-35LWS BOPs with FW1305-09 O-rings—where seal reliability is critical for preventing marine environmental pollution.

• Onshore High-Pressure Oilfields: Withstand ambient temperatures from -29℃ to 121℃ (matching the temperature range of 2FZ35-70 series BOPs) and working pressures up to 70 MPa (10,152 psi). Suitable for 2FZ2870ASL BOPs with 2FZ2870ASL.03.02-00 Side Door Seals, FHZ5414 series BOPs with FHZ5414-15 Piston Seals, and ram BOPs with SKZF133.01 Y-Rings in desert and high-temperature wells—where extreme conditions test seal durability.

• Annular & Ram BOPs: Specifically designed for 2FZ3570ASL, 2FZ2835ALWS, 2FZ2870ASL, FZ18-21LWS/FZ18-35LWS single and double ram BOPs, and FHZ5414 series BOPs. These components handle frequent actuation (up to 70 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 70 MPa), preventing well fluid escape and catastrophic incidents. All components meet the static水压强度试验 pressure requirement of 1.5 times the rated pressure, as recommended in the revised GB/T 20174-2006 standard.

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 and 2FZ2835ALWS.03.02.04-00 Piston Seals, and 2FZ2870ASL.03.02-00 Side Door Seals every 6 weeks for wear, cracks, or deformation; replace immediately if wear depth exceeds 1.1 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 9 months.

• O-Rings & Adapter Rings: Inspect O-rings (85X5.7, 53×5.3, FW1305-09, SKF14-190-06.07) and adapter rings (H24 series) 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 adapter rings are properly aligned during installation—misaligned adapter rings cause O-ring leakage, a common field issue.

• Wear, Wiper & Dust Rings: Inspect wear rings (H24.13, 2FZ3570ASL-11), wiper rings (2FZ2835ALWS.03.14-05, 2FZ3570ASL.16-05), and dust rings (SFZ1310-23) every 2 months for wear or debris buildup; replace if wear depth exceeds 1.0 mm. Clean the ram shaft and piston surface before installation to remove debris—debris on sealing surfaces is a major cause of rapid seal wear. Regularly clean dust rings to prevent debris accumulation.

• Lip, Y, U-Seals & Packing: Inspect lip rings (2FZ2835ALWS.03.02-06, 2FZ3570ASL.16.03-00), Y-rings (SKZF133.01), U-seals (SFZ1310-13), and packing (2FZ2835ALWS.03.14.03-00, EM-09-1) every 2 months for lip damage or wear; replace if the lip is torn or flattened. Avoid over-tightening BOP bolts, as this can damage the lip ring and cause leakage. Replace EM-09-1 Plastic Packing every 28 months, even if no visible damage is present—this prevents BOP jamming during emergencies.

• Bonnet, Piston & Outer Sleeve Seals: Inspect FHZ5414-08, FHZ5414-15, FHZ5414-12, H27.07, H27.11, and H27.13 seals every 2 months for leakage or wear; replace if leakage is detected. Clean the bonnet and piston surfaces before installation to remove debris. Ensure proper alignment of outer sleeve seals to prevent leakage at pressure boundaries.

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: 2FZ3570ASL BOP; Fault: 2FZ3570ASL.12-00 Piston Seal leakage causing 52 L/h well fluid loss and inability to maintain pressure; Load: 70 MPa working pressure, 95% relative humidity; Solution: Replace with our 2FZ3570ASL.12-00 Piston Seal; Repair Effect: No leakage, BOP maintains stable pressure for 180 hours, actuation smooth; Customer Feedback: “The piston seal fit perfectly with our 2FZ3570ASL 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: FZ18-35LWS Double Ram BOP; Fault: FW1305-09 O-ring leakage leading to adapter ring seepage and BOP body corrosion; Load: 68 MPa working pressure, 33 Hz vibration; Solution: Replace with our FW1305-09 O-ring and H24.07 O-Ring Adapter Ring; Repair Effect: No seepage, BOP body corrosion stopped, stable operation for 150 hours; Customer Feedback: “The O-ring and adapter ring work seamlessly together—withstanding high pressure and vibration, reducing our maintenance frequency and ensuring BOP reliability in high-intensity operations.”

3. Case 3: Tarim Onshore Oilfield (China) – Equipment Model: 2FZ2835ALWS BOP; Fault: 2FZ2835ALWS.03.02.04-00 Piston Seal wear causing hydraulic oil contamination and piston damage; Load: 65 MPa working pressure, 90℃ ambient temperature; Solution: Replace with our 2FZ2835ALWS.03.02.04-00 Piston Seal and clean hydraulic oil; Repair Effect: No infiltration, piston wear reduced to 0.006 mm/month, oil remains clean for 9 months; Customer Feedback: “The piston seal’s high-temperature resistance is exceptional—we eliminated contamination issues, saving us from costly piston replacements and unplanned downtime.”

4. Case 4: North Sea Offshore Oilfield (UK) – Equipment Model: FHZ5414 BOP; Fault: FHZ5414-08 Top Cover Inner Sealing Ring failure causing bonnet leakage and hydraulic system contamination; Load: 62 MPa working pressure, high salt spray; Solution: Replace with our FHZ5414-08 Top Cover Inner Sealing Ring; Repair Effect: No leakage, hydraulic oil remains clean, bonnet operation smooth; Customer Feedback: “The top cover seal’s corrosion resistance is outstanding—even in harsh offshore salt spray, it maintains tight sealing, protecting our hydraulic system 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, 2FZ2835ALWS.03.02.04-00 Piston Seal, FW1305-09 O-ring, H24 series adapter seals, FHZ5414 series bonnet/piston seals, SKZF133.01 Y-ring, EM-09-1 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 piston leakage, side door seepage, ram shaft seepage, and adapter ring misalignment. 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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