FZ18-21LWS BOP Seals & 2FZ3535ASL Piston Seal

Introduction

In oilfield well control operations, blowout preventers (BOPs) are the last line of defense against well blowouts, and the reliability of their sealing components—from O-rings and piston seals to wear rings and backup rings—directly determines operational safety and compliance. A single faulty seal, such as a leaking 76X5.3(IDxd) O-ring, a worn 2FZ3535ASL.03.09-00 Piston Seal, or a damaged SKZF100.01 Y-ring, can lead to well fluid leakage, BOP failure, unplanned downtime, and even catastrophic environmental pollution or financial losses. The parts listed, including EM-09-1 Plastic Packing (for FZ18-21LWS/FZ18-35LWS BOPs), 2FZ3535ASL.03.09-00 Piston Seal, SKZF100.02 Backup Ring (for FZ54-35 BOPs), and various O-rings (H06.11, 76X5.3, 106X5.3), are precision-manufactured to fit specific BOP models. These parts are fully compatible with FZ18-21LWS/FZ18-35LWS single and double ram BOPs, FZ54-35 single and double ram BOPs, 2FZ3535ASL, 2FZ35105A, and 2FZ1870DBYS BOPs—commonly used in onshore and offshore oilfields by Honghua, Jereh, and NOV. Our product line targets three core user groups: well control maintenance teams needing reliable replacement seals for daily BOP inspections and emergency repairs, BOP operators requiring durable components to ensure equipment integrity, and procurement departments seeking standards-compliant, long-lasting spares that reduce maintenance costs and operational risks. The core purpose of these parts is to solve industry pain points—such as BOP seal leakage, piston wear, ram shaft seepage, and well fluid infiltration into hydraulic cylinders—ensuring the tight sealing and stable operation of BOP systems, preventing blowouts, reducing unplanned downtime, and helping operators comply with strict oilfield safety regulations. As critical components of BOPs, these seals and rings directly protect personnel, equipment, and the environment from the hazards of well control failures.

Product Overview

We supply a comprehensive range of high-quality BOP sealing components, covering O-rings, piston seals, wear rings, wiper rings, Y-rings, backup rings, lip rings, and plastic packings—all designed specifically for oilfield BOP systems. Key models include EM-09-1 Plastic Packing (for FZ18-21LWS/FZ18-35LWS BOPs), 2FZ3535ASL.03.09-00 Piston Seal, SKZF100.01 Y-ring (for FZ54-35 BOPs), 76X5.3(IDxd) O-ring, and 2FZ35105A.03-11 Wiper Ring. All parts are manufactured in strict compliance with API 16A (for BOP components), API 16C (for well control equipment), GB/T 20425-2006 (for hydraulic seals), and Q/ZB336-77 (for wiper rings), and have passed API Q1+ and ISO 9001:2008 certifications—rigorous quality benchmarks for oilfield well control components. Each unit undergoes 100% pressure testing (up to 70MPa for high-pressure seals) and leakage testing before leaving the factory. Backed by 19 years of oilfield BOP seal R&D and production experience, our products have been used in 58 major oilfields globally, with a cumulative service life of over 1,250,000 hours in harsh BOP operating environments. Our 2FZ3535ASL.03.09-00 Piston Seal has a mean time between failures (MTBF) of 16,800 hours, while our EM-09-1 Plastic Packing lasts up to 28 months under continuous BOP operation—9,800 hours and 9 months longer than the industry average, respectively. The SKZF100.01 Y-ring maintains tight sealing even after 1,200 cycles of ram movement, 300 cycles more than standard industry Y-rings. All parts feature drop-in replacement design, eliminating the need for BOP modifications and reducing maintenance time by up to 7 hours per replacement—critical for minimizing downtime during emergency well control.

Key Product Functions

Every BOP seal and ring is engineered to address specific well control pain points, with core functions focused on tight sealing, wear resistance, and pressure resistance—directly supporting the safe operation of BOP systems and preventing common failures like fluid leakage and component damage:

• Piston Seals & Wear Rings: The 2FZ3535ASL.03.09-00 Piston Seal and SFZ2835-06 Piston Seal provide tight sealing for BOP piston assemblies, solving the problem of well fluid infiltration into hydraulic cylinders—preventing oil contamination and piston damage. The H06.08.03 Lower Wear Ring, H06.08.04 Inner Wear Ring, and H06.08.05 Upper Wear Ring reduce friction between the piston and cylinder wall, solving the problem of piston wear and extending piston service life by 3 years. These components ensure smooth piston movement, critical for reliable BOP ram actuation.

• O-rings & Backup Rings: O-rings (H06.11, 76X5.3, 106X5.3, 150X3.55) provide static and dynamic sealing for BOP connections, solving the problem of fluid leakage at seal interfaces—preventing well fluid loss and environmental pollution. Backup rings (SKZF90.02, SKZF100.02, C663-22) support O-rings and Y-rings under high pressure, solving the problem of seal extrusion and deformation at pressures up to 70MPa—ensuring sealing integrity even in extreme well control conditions.

• Y-rings & Lip Rings: SKZF90.01, SKZF107.01, and SKZF135.01 Y-rings provide dynamic sealing for BOP ram shafts and piston rods, solving the problem of fluid leakage during ram movement—ensuring tight sealing even when the ram is actuated repeatedly. The 2FZ1870DBYS.03-23 Lip Ring seals the BOP cover, solving the problem of well fluid seepage from the cover interface—preventing equipment corrosion and environmental hazards.

• Wiper Rings & Plastic Packings: Q/ZB336-77 90 Wiper Ring and 2FZ35105A.03-11 Wiper Ring remove debris and well fluid from ram shafts, solving the problem of contamination that causes seal damage and BOP jamming. EM-09-1 Plastic Packing (for FZ18-21LWS/FZ18-35LWS BOPs) provides reliable sealing for ram assemblies, solving the problem of BOP inability to close fully due to worn packing—critical for emergency well control.

Structural Features

Our BOP seals and rings 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, and frequent ram actuation:

• Piston Seals & Wear Rings: Piston seals (2FZ3535ASL.03.09-00, SFZ2835-06) are made of high-temperature (up to 130℃) and oil-resistant nitrile rubber with a reinforced fabric layer, ensuring resistance to well fluid corrosion and high pressure (up to 70MPa). Wear rings are made of high-strength PTFE material, with a low-friction surface to reduce piston wear—dimensional accuracy of ±0.015mm ensures perfect fit with BOP piston assemblies.

• O-rings & Backup Rings: O-rings are made of nitrile rubber or fluororubber (depending on application), with precise ID/OD dimensions (e.g., 76X5.3, 106X5.3) and a smooth surface to prevent leakage. Backup rings (SKZF100.02, C663-22) are made of rigid PTFE, designed to fit perfectly with O-rings and Y-rings—preventing extrusion under high pressure and extending seal life by 2 years.

• Y-rings & Lip Rings: Y-rings feature a unique Y-shaped cross-section that expands under pressure, enhancing sealing performance—ideal for dynamic sealing of ram shafts. Lip rings (2FZ1870DBYS.03-23) have a flexible lip design that adapts to cover interface irregularities, ensuring tight sealing even if the cover is slightly misaligned. Both are made of oil-resistant, wear-resistant materials to withstand frequent ram movement.

• Wiper Rings & Plastic Packings: Wiper rings (Q/ZB336-77 90) have a dual-scraper design to remove debris and fluid from ram shafts—preventing contamination of internal seals. EM-09-1 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 and preventing BOP jamming.

Applicable Working Conditions

Our BOP seals and rings are specially engineered to withstand the harshest oilfield environments, perfectly suited for the extreme conditions of BOP operation—high pressure, well fluid corrosion, extreme temperatures, and frequent ram actuation:

• Offshore Oilfield BOP Systems: Adapt to high humidity (relative humidity 85%-100%), salt spray corrosion, and seismic intensity up to 8 degrees. Ideal for FZ18-21LWS/FZ18-35LWS BOPs with EM-09-1 Plastic Packing, 2FZ3535ASL BOPs with 2FZ3535ASL.03.09-00 Piston Seals, and FZ54-35 BOPs with SKZF100.02 Backup Rings—where seal reliability is critical for preventing offshore environmental pollution.

• Onshore High-Pressure Oilfields: Withstand ambient temperature from -45℃ to 130℃ and working pressure up to 70MPa (10150psi). Suitable for 2FZ35105A BOPs with 2FZ35105A.03-11 Wiper Rings, 2FZ1870DBYS BOPs with 2FZ1870DBYS.03-23 Lip Rings, and various O-rings (150X3.55, 240.67X5.33) in desert and high-temperature wells—where extreme conditions test seal durability.

• Single & Double Ram BOPs: Specifically designed for FZ18-21LWS/FZ18-35LWS and FZ54-35 single and double ram BOPs, ensuring compatibility with ram assemblies and piston systems. These seals handle the frequent ram actuation (up to 50 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 70MPa), preventing well fluid leakage 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—avoiding common mistakes that lead to premature seal failure, based on industry best practices and years of on-site experience, including solutions to common BOP seal issues:

• Piston Seals & Wear Rings: Inspect 2FZ3535ASL.03.09-00 Piston Seals and H06 series Wear Rings every 1.5 months for wear, cracks, or deformation; replace immediately if wear depth exceeds 1.2mm. Clean the piston seal groove and cylinder wall before installation to remove debris—avoid using sharp tools that can cut seals. Lubricate the piston and wear rings with high-temperature, oil-resistant lubricant (ISO VG 68) before installation to reduce friction—this simple step can extend seal life by 6 months.

• O-rings & Backup Rings: Inspect O-rings (76X5.3, 106X5.3) and Backup Rings (SKZF100.02) every month for swelling, cracks, or extrusion damage; replace if any defects are found. Store O-rings in a cool, dry environment (temperature 5℃-25℃) to prevent rubber aging, and avoid contact with well fluid or chemicals before installation. Ensure backup rings are installed correctly (aligned with O-rings) to prevent extrusion—incorrect installation is a common cause of seal failure.

• Y-rings & Lip Rings: Inspect SKZF series Y-rings and 2FZ1870DBYS.03-23 Lip Ring every 2 months for lip damage or wear; replace if the lip is torn or flattened. Clean the ram shaft and cover interface before installation to remove debris—debris on sealing surfaces is a common cause of leakage. Avoid over-tightening the BOP cover bolts, as this can damage the lip ring and cause leakage.

• Wiper Rings & Plastic Packings: Inspect Q/ZB336-77 90 Wiper Rings and EM-09-1 Plastic Packing every month for debris buildup or wear; clean the wiper ring regularly to remove accumulated debris. Replace EM-09-1 Plastic Packing every 24 months, even if no visible damage is present—this prevents BOP jamming and ensures reliable closure during emergencies. For FZ18-21LWS/FZ18-35LWS BOPs, check the plastic packing alignment before reassembling the ram to avoid misalignment and leakage.

We supply the following spare parts:

Field Fault Maintenance Cases

The following are 4 real on-site maintenance cases from domestic and foreign oilfields, demonstrating how our BOP seals solve actual well control problems and deliver reliable performance, including solutions to common BOP seal failures:

1. Case 1: South China Sea Offshore Oilfield (China) – Equipment Model: FZ18-35LWS Double Ram BOP; Fault: EM-09-1 Plastic Packing wear causing BOP inability to close fully, well fluid leakage of 45L/h; Load: 60MPa well pressure, 95% humidity; Solution: Replace with our EM-09-1 Plastic Packing; Repair Effect: BOP closes fully in 2.5 seconds, leakage reduced to 0L/h, stable operation for 144 hours; Customer Feedback: “The plastic packing fits perfectly—restoring our BOP’s emergency closure capability and preventing a potential blowout, which is critical for our offshore safety compliance.”

2. Case 2: Permian Basin Oilfield (USA) – Equipment Model: 2FZ3535ASL BOP; Fault: 2FZ3535ASL.03.09-00 Piston Seal leakage causing well fluid infiltration into hydraulic cylinder, oil contamination, and piston wear; Load: 70MPa working pressure, 30Hz vibration; Solution: Replace with our 2FZ3535ASL.03.09-00 Piston Seal and clean hydraulic oil; Repair Effect: No infiltration, piston wear reduced to 0.01mm/month, oil remains clean for 6 months; Customer Feedback: “The piston seal’s sealing performance is exceptional—we no longer have oil contamination issues, saving us from costly piston replacements and unplanned downtime.”

3. Case 3: Tarim Onshore Oilfield (China) – Equipment Model: FZ54-35 Single Ram BOP; Fault: SKZF100.01 Y-ring damage causing ram shaft leakage, well fluid loss of 30L/h; Load: 55MPa well pressure, 88℃ ambient temperature; Solution: Replace with our SKZF100.01 Y-ring and SKZF100.02 Backup Ring; Repair Effect: No leakage, Y-ring maintains tight sealing after 800 ram cycles; Customer Feedback: “The Y-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 (Norway) – Equipment Model: 2FZ1870DBYS BOP; Fault: 2FZ1870DBYS.03-23 Lip Ring leakage causing cover seepage, salt spray corrosion of BOP body; Load: 65MPa working pressure, high salt spray; Solution: Replace with our 2FZ1870DBYS.03-23 Lip Ring; Repair Effect: No seepage, BOP body corrosion stopped, stable operation for 168 hours; Customer Feedback: “The lip ring’s corrosion resistance is outstanding—even in harsh offshore salt spray, it maintains tight sealing, protecting our BOP from damage and ensuring compliance with environmental regulations.”

FAQ (Frequently Asked Questions)

Procurement Guide

We supply a full range of high-quality BOP sealing components, including EM-09-1 Plastic Packing (for FZ18-21LWS/FZ18-35LWS BOPs), 2FZ3535ASL.03.09-00 Piston Seal, SKZF100.01 Y-ring, 76X5.3(IDxd) O-ring, and SKZF100.02 Backup Ring—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 well fluid infiltration. All products meet API 16A, API 16C, 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.

contact us ：

Emeil: [email protected]  

whatsapp: +86 15275658619