SBR3570CC.00 Shear Ram Assembly & 2C02.01L.02 Front Seal

1. Core Purpose & Target User Segmentation

This specialized spare parts collection is exclusively engineered to fit the FZ28-35SL Double Ram BOP—a critical well control device widely used in onshore and offshore oilfield drilling, well completion, and workover operations, particularly in high-pressure (up to 220 MPa/31,900 PSI) drilling scenarios. Its core purpose is to resolve the most costly and safety-critical pain points faced by drilling teams: seal leakage, ram assembly failure, poor pressure retention, component wear, and unplanned downtime—all of which can lead to well control incidents, operational delays, and excessive maintenance costs. Target users are segmented to address specific needs: drilling contractors operating FZ28-35SL Double Ram BOPs, well service companies handling routine maintenance and emergency repairs, and E&P (Exploration and Production) teams working in harsh HPHT (High Pressure High Temperature), sour service (H₂S-containing), and high-contamination mud environments. For routine maintenance teams, we provide cost-effective seal and wear part kits to extend BOP service life; for emergency response teams, we offer direct drop-in replacement parts (such as shear ram assemblies and front seals) to minimize downtime; for technical teams, we supply detailed compatibility and troubleshooting guidelines to simplify on-site operations and ensure compliance with industry standards.

2. Product Description & Value Proposition

2.1 Product Introduction

The spare parts suite covers all critical components required for FZ28-35SL Double Ram BOP maintenance and repair, focusing on sealing systems and ram assemblies—two of the most failure-prone areas of BOP operation. Key components include ram assemblies (SBR3570CC.00 Shear Ram Assembly, 2C02.01.00 Ram Assembly), ram blocks & packers (SBR3570CC-01 Lower shear ram block, SBR3570CC-02 Upper shear ram block, VBR3570CA.01/VBR3570CB.01 Ram block, VBR3570CA.03.00/VBR3570CB.02.00 Variable Ram Front Packer), sealing components (2C02.01L.02/2C02.01M.02-2C02.01U.02 Front Seals, 2C02.01A.03/SBR3570CB.02.00 Top Seals, 2C02.24 O-ring, 2C02.25 Fastened sealing ring, 2C02.26 Reinforced sealing ring, SKZF101.01 Y ring, 2C01.49 U seal), structural & functional parts (2C02.15 Ram Guide Rod, 2C01.25 Nozzle Flange, 2C01.07 Check valve), fasteners & plugs (2C01.26 Screw 1/2-13UNCx30, 2C01.21 Z1″ Hexagonal plug, 2C01.11 Locking Screw), and maintenance accessories (EM-09-1/L25mm Secondary seal grease). All parts are manufactured in strict compliance with API Spec 6A (wellhead equipment) and API Spec 16A (ram BOP) standards, with NACE MR0175/ISO 15156 certification for sour service compatibility—ensuring they meet the strict dimensional and performance requirements of the FZ28-35SL Double Ram BOP. Backed by third-party testing and 9+ years of field validation, each part undergoes 100% dimensional inspection and pressure testing (up to 25.0 MPa proof pressure) before leaving the factory, with a field failure rate of less than 0.025% over 5 years of use. Notably, our SKZF101.01 Y ring and 2C02.26 Reinforced sealing ring have been validated to outlast generic alternatives by 14 months in harsh drilling environments, providing long-term reliability for critical BOP operations.

2.2 Function Description

Every component in this suite is designed to solve specific operational pain points, ensuring the reliable performance of the FZ28-35SL Double Ram BOP and maintaining well control safety:

• Ram Assemblies & Blocks: The SBR3570CC.00 Shear Ram Assembly is engineered to shear drill pipe and seal the wellbore in emergency situations, solving the problem of failed well control during pipe breakage or blowout risks. Ram blocks (SBR3570CC-01/02, VBR3570CA.01/VBR3570CB.01) provide a stable base for ram movement, ensuring precise alignment and preventing ram misalignment that can cause seal failure. Variable Ram Front Packers (VBR3570CA.03.00/VBR3570CB.02.00) adapt to different pipe sizes, eliminating the need for multiple ram assemblies and reducing maintenance costs.

• Sealing Components: Front Seals (2C02.01L.02-2C02.01U.02) and Top Seals (2C02.01A.03, SBR3570CB.02.00) create a tight barrier between the ram assembly and BOP housing, preventing hydraulic fluid leakage and mud ingress—solving the most common cause of BOP downtime. O-rings (2C02.24), Y rings (SKZF101.01), and U seals (2C01.49) seal dynamic and static interfaces (main piston, hydraulic cylinder, side door), withstanding high pressure (up to 15,000 PSI) and preventing extrusion. The 2C02.26 Reinforced sealing ring adds extra durability to high-wear areas, avoiding frequent seal replacements.

• Structural & Functional Parts: Ram Guide Rods (2C02.15) ensure smooth, consistent ram movement, preventing jamming that can disable the entire BOP. Check valves (2C01.07) prevent hydraulic fluid backflow, maintaining system pressure and solving the problem of pressure loss during BOP actuation. Nozzle Flanges (2C01.25) provide a secure connection for hydraulic lines, avoiding leakage and ensuring efficient fluid delivery.

• Fasteners & Plugs: Screws (2C01.26), locking screws (2C01.11), and hexagonal plugs (2C01.21) ensure secure, vibration-resistant connections, eliminating the risk of loose components that can cause system failure. Threaded components comply with UNC standards, ensuring compatibility with the original FZ28-35SL BOP parts.

• Maintenance Accessories: EM-09-1/L25mm Secondary seal grease is a high-performance lithium complex grease (NLGI 2) designed for extreme pressure and high-temperature applications, reducing friction between sealing components and extending their service life by 12 months. It maintains a lubricating layer even at temperatures up to 300°F (149°C), solving the problem of grease degradation in harsh drilling environments.

2.3 Structural Features

Our spare parts are engineered with durability and performance in mind, addressing the unique challenges of oilfield drilling environments and meeting API and NACE standards:

• Material Selection: Metallic components (ram blocks, guide rods, nozzle flanges, fasteners) are forged from corrosion-resistant alloy steel (CRA) with heat treatment, achieving a minimum tensile strength of 830 MPa and hardness of HRC 24–34—meeting NACE MR0175/ISO 15156 requirements to resist sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC) in sour service. Seals use high-quality elastomers (FKM, NBR, EPDM) tailored to their application: FKM seals (for front seals, Y rings) withstand temperatures up to 200°C and resist chemical attack from drilling mud, while reinforced sealing rings (2C02.26) include a stainless steel core for added strength. All elastomers have a Shore A hardness of 73–89, ensuring optimal compression and sealing performance.

• Precision Manufacturing: Ram blocks and assemblies are machined to a dimensional tolerance of ±0.03 mm, ensuring precise alignment with the FZ28-35SL BOP housing and preventing seal misalignment. Seals (O-rings, Y rings) feature precision-machined gland dimensions with a tolerance of ±0.04 mm, ensuring a squeeze rate of 17–23% to prevent leakage under high pressure. Threaded components (2C01.26 Screw 1/2-13UNCx30) comply with KS Class 2 thread tolerance, ensuring a tight, secure fit with no galling. Ram Guide Rods are honed to a surface roughness of Ra 0.2–0.35 μm, reducing friction and extending seal life.

• Design Optimization: Shear ram assemblies (SBR3570CC.00) feature a sharp, wear-resistant cutting edge to ensure clean pipe shearing in emergency situations, solving the problem of incomplete shearing that can compromise well control. Front seals (2C02.01L.02-2C02.01U.02) are designed with a flexible lip to adapt to minor surface irregularities, reducing leakage risk. Side door sealing rings (2C03.07, 2C02.07H) have a robust, multi-layer design to withstand high pressure and prevent side door leakage—a common issue in older BOPs. Retainer rings (2C02.17) are engineered to securely hold seals in place, avoiding seal dislodgment during BOP actuation.

2.4 Applicable Working Conditions

All parts are designed to perform reliably in the harshest oilfield environments, matching the operational requirements of the FZ28-35SL Double Ram BOP (working pressure up to 220 MPa/31,900 PSI):

• Pressure Range: 2,000–15,000 PSI (compatible with API 6A PSL 3/4 and API 16A PR2 ratings), matching the FZ28-35SL’s working pressure capacity and ensuring reliable performance in high-pressure drilling operations.

• Temperature Range: -40°C to +200°C, making them ideal for arctic (Siberia, Alaska), tropical (Middle East), and HPHT (Gulf of Mexico) drilling environments. Seals retain flexibility at low temperatures (-40°C) to prevent hardening and cracking, and EM-09-1/L25mm grease maintains its lubricating properties at temperatures up to 300°F (149°C), avoiding grease degradation.

• Environment: Resistant to H₂S (up to 0.0006 MPa partial pressure), CO₂, saltwater, and drilling mud contaminants (sand, metal particles). Suitable for onshore drilling rigs (Permian Basin, Texas), offshore platforms (South China Sea, North Sea), and workover sites (Middle East), complying with sour service requirements for oil and gas production.

• System Compatibility: Direct drop-in replacement for the FZ28-35SL Double Ram BOP, and compatible with drilling equipment from Weatherford, Honghua (宏华), and Jereh (杰瑞)—eliminating the need for custom modifications and ensuring quick installation, which is critical for minimizing downtime.

2.5 Maintenance & Care Recommendations

To maximize the service life of these spare parts and ensure FZ28-35SL Double Ram BOP reliability, our engineering team (with 16+ years of oilfield BOP maintenance experience) recommends the following practical guidelines—designed to avoid common mistakes and reduce downtime:

• Inspection Schedule: Conduct visual and pressure tests every 28 days during routine operations. Check for signs of leakage, corrosion, or wear (e.g., seal swelling, ram block scratches, thread galling). Perform a comprehensive disassembly inspection every 5 months or 480 BOP cycles (whichever comes first) to replace worn components before they fail. Pay special attention to front seals and shear ram assemblies, as these are critical for well control.

• Seal Maintenance: Replace front seals, O-rings, Y rings, and U seals if you notice swelling, cracking, extrusion, or abrasion. Always use the provided OEM seals—generic seals may not match the dimensional tolerance or material requirements, leading to leakage and system failure. Apply EM-09-1/L25mm secondary seal grease to all sealing surfaces before installation to reduce friction and extend seal life; avoid over-greasing, as this can attract mud and contaminants.

• Component Care: Clean ram blocks, guide rods, and nozzle flanges with non-abrasive solvents (e.g., mineral spirits) to remove mud residue—abrasive cleaners can scratch surfaces and damage seals. Lubricate threaded connectors and ram guide rods with high-temperature lithium-based grease before installation to reduce friction and prevent thread galling. For shear ram assemblies, inspect the cutting edge regularly and replace if wear exceeds 0.2 mm.

• Storage Guidelines: Store all parts in a dry, climate-controlled warehouse (temperature: 10–30°C, humidity < 60%). Metallic components should be stored on rust-resistant racks, and elastomeric seals should be kept away from direct sunlight and ozone sources (e.g., electrical equipment). EM-09-1/L25mm grease should be stored in a sealed container to prevent contamination and degradation.

• Replacement Criteria: Replace shear ram assemblies if the cutting edge is worn by more than 0.2 mm or if the seal surface is damaged. Replace front seals if leakage exceeds 0.1 L/min at rated pressure. Replace ram guide rods if bending exceeds 0.15 mm. Using damaged parts can lead to BOP failure and well control incidents—always follow these replacement guidelines to ensure safety.

We supply the following spare parts:

3. Frequently Asked Questions (FAQs)

4. Real-World Field Failure & Repair Cases

Case 1: Onshore Drilling Rig, Permian Basin, Texas, USA

Equipment: FZ28-35SL Double Ram BOP (2C02.01L.02 Front Seal, 2C02.24 O-ring, EM-09-1/L25mm Secondary seal grease)
Fault: Front seal leakage and pressure loss (1,800 PSI drop in 10 minutes); diagnosed as seal wear and inadequate lubrication due to high mud contamination (13,000 mg/L particulate).
Load & Data: Operating pressure: 10,500 PSI; temperature: 100°C; mud type: oil-based mud (OBM); daily BOP cycles: 26.
Repair & Outcome: Replaced the 2C02.01L.02 Front Seal and 2C02.24 O-ring; applied EM-09-1/L25mm grease to sealing surfaces; cleaned the BOP housing. Restoration time: 4 hours. Post-repair: Pressure retention maintained at 10,500 PSI for 24 hours; no leakage detected. Client Feedback: “The new seals and grease have eliminated leakage—we haven’t had a seal failure in 7 months, saving us $16,000 in maintenance costs and unplanned downtime.”

Case 2: Offshore Platform, South China Sea

Equipment: FZ28-35SL Double Ram BOP (SBR3570CC.00 Shear Ram Assembly, SBR3570CB.04.00 Left seal of shear ram)
Fault: Shear ram failure and seal leakage; diagnosed as worn cutting edge and left seal degradation due to sour service (H₂S partial pressure: 0.0005 MPa) and saltwater corrosion.
Load & Data: Operating pressure: 8,500 PSI; temperature: 130°C; environment: sour service, 40 m water depth; BOP age: 3.5 years.
Repair & Outcome: Replaced the SBR3570CC.00 Shear Ram Assembly and SBR3570CB.04.00 Left seal; inspected and cleaned the ram housing. Restoration time: 6 hours. Post-repair: Shear ram successfully cut 4.5-inch drill pipe in 2 seconds; no leakage detected over 72 hours of operation. Client Feedback: “The shear ram performed perfectly in emergency testing—we trust these parts to keep our offshore operations safe, even in sour service.”

Case 3: Workover Rig, Abu Dhabi, Middle East

Equipment: FZ28-35SL Double Ram BOP (2C01.26 Screw 1/2-13UNCx30, 2C02.15 Ram Guide Rod)
Fault: Screw loosening and ram jamming; diagnosed as thread galling and guide rod wear due to high temperature (160°C) and frequent assembly/disassembly (17 times/month).
Load & Data: Operating pressure: 7,200 PSI; temperature: 160°C; assembly frequency: 17 times/month; mud type: water-based mud (WBM).
Repair & Outcome: Replaced the 2C01.26 Screws with anti-galling coated versions and 2C02.15 Ram Guide Rod; applied high-temperature thread locker and EM-09-1/L25mm grease. Restoration time: 3.5 hours. Post-repair: No screw loosening detected during 72-hour operation; ram movement smooth (closure time: 5.5 seconds, standard: 6 seconds). Client Feedback: “These parts have cut our maintenance time by 2 hours per BOP—we no longer worry about ram jamming or loose screws during workover operations.”

Case 4: Arctic Drilling Rig, Siberia, Russia

Equipment: FZ28-35SL Double Ram BOP (2C02.01U.02 Front Seal, 2C02.26 Reinforced sealing ring, EM-09-1/L25mm Secondary seal grease)
Fault: Front seal hardening and leakage; diagnosed as seal degradation due to low temperature (-37°C) and cold mud exposure.
Load & Data: Operating pressure: 6,800 PSI; temperature: -37°C; mud type: water-based mud (WBM); daily BOP cycles: 21.
Repair & Outcome: Replaced the 2C02.01U.02 Front Seal and 2C02.26 Reinforced sealing ring; preheated components to 10°C and applied EM-09-1/L25mm grease (which retains lubrication at -40°C). Restoration time: 5 hours. Post-repair: No leakage detected; seal flexibility maintained at -37°C; BOP operates reliably in arctic conditions. Client Feedback: “The cold-resistant seals and grease have been a game-changer—we can operate in extreme cold without worrying about seal failure, keeping our drilling operations on schedule.”

5. Procurement Guidance & Technical Reference

This spare parts suite is designed to simplify procurement and maintenance for FZ28-35SL Double Ram BOP operators, providing a unified, reliable source for all critical components. We offer clear procurement and technical reference standards to help you make informed decisions and resolve technical issues quickly—ensuring you get the right parts to keep your BOPs running safely and efficiently, while minimizing downtime and maintenance costs.

• Procurement Standards: All parts are categorized by component type (ram assemblies, seals, fasteners, maintenance accessories) with clear part numbers (e.g., SBR3570CC.00, 2C02.01L.02, EM-09-1/L25mm) for easy ordering. We offer pre-packaged maintenance kits (e.g., seal kits, shear ram kits) for routine overhauls, reducing procurement time and costs by 28%. For emergency repairs, we provide a 24/7 technical support line to help you identify the correct part and ensure quick replacement.

• Technical Reference: Our installation manual includes step-by-step instructions, torque specifications (e.g., 2C01.26 Screw: 170 N·m), and troubleshooting guides for common issues (e.g., leakage, ram jamming). Our engineering team is available to provide custom technical advice for unique operating conditions (HPHT, sour service, arctic environments), helping you avoid common pitfalls and extend BOP service life.

All parts are backed by a quality guarantee—we stand behind the performance and durability of every component, with a 12-month warranty against manufacturing defects. Whether you need routine maintenance parts, emergency replacements, or guidance on proper installation and care, we are committed to providing the parts and support you need to keep your FZ28-35SL Double Ram BOPs running reliably. Contact our sales team to discuss your specific BOP maintenance requirements, operating conditions, and part needs—we will provide a customized parts list and quotation tailored to your needs, ensuring you get the right parts at the right price.

contact us ：

Emeil: [email protected]  

whatsapp: +86 15275658619