2C02.03.02 Boosting Hydraulic Cylinder & FH Series Annular BOP Spare Parts

1. Core Purpose & Target User Segmentation

This integrated spare parts collection is exclusively engineered to match FZ28-35SL Double Ram BOP, FH18/FH23/FH28/FH35/FHZ Series Annular BOPs (including FH18-21NL, FH18-35NL, FH23-21NL, FH28-35(/70)NL, FH35-21 NL, FHZ35-35, FHZ53-21, FHZ54-14, etc.), and their supporting hydraulic systems. Its core purpose is to resolve critical operational pain points in oilfield drilling—such as hydraulic leakage, component wear, pressure loss, and unplanned downtime—that directly threaten well control safety and operational efficiency. Target users are segmented to meet specific needs: drilling contractors operating onshore/offshore rigs, well service companies handling well completion and workover, 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; for emergency response teams, we offer quick-replace components to minimize downtime; for technical teams, we supply parts with clear compatibility and maintenance guidelines to simplify troubleshooting.

2. Product Description & Value Proposition

2.1 Product Introduction

The spare parts suite covers all critical components needed for FZ28-35SL Double Ram BOP and FH Series Annular BOP maintenance and repair, including hydraulic actuation components (2C02.03.02 Boosting Hydraulic Cylinder, 2C03.03.09/2C01.03.09 Hydraulic Cylinder Cap), precision seals (77.5X5.3(ID×d) O-ring, 300×5.3 O-ring, 43.7X3.55 Oring, 112X7 O-ring, etc.—each tailored to specific positions like main piston tail rod, cylinder cap, nozzle flange, and baffle plate), mechanical connectors (2C01.34 Z1 internal Hex Plug, 2C02.03.03 Screw 1 3/4-8UN-2Ax405, Z1″ Connector), structural components (2C01.03.02 Connecting Plate, 2C01.03.04 Baffle Plate, 2C02.11A-04 Retaining Block), hydraulic pipeline parts (2CB.03A/2CB.02A Connecting pipeline, 2CB.03A.01/2CB.02A.01 Oil block), wear-resistant parts (2C01.49 Wear Rings of Main Piston, 2C01.03.11 Wear Ring of Boosting Piston Tail Rod), and BOP-specific spare parts (FH1821NL-00, H08.00, H17.00, SKF15-238-01.00, etc., for various FH/FHZ Series Annular BOPs). All parts are manufactured in strict compliance with API Spec 6A (wellhead equipment) and API Spec 16A (annular BOP) standards, with NACE MR0175/ISO 15156 certification for sour service compatibility—ensuring they meet the strict dimensional and performance requirements of oilfield drilling equipment. Backed by third-party testing and field validation, each part undergoes 100% dimensional inspection and pressure testing before leaving the factory, with a failure rate of less than 0.02% in field applications over 5 years.

2.2 Function Description

Every component in this suite is designed to solve specific operational pain points, ensuring the reliable performance of BOP systems:

• Boosting Hydraulic Cylinder (2C02.03.02) & Cylinder Cap (2C03.03.09/2C01.03.09): Convert hydraulic energy into mechanical force to drive BOP rams and annular packing elements, enabling rapid closure (within 5 seconds at rated pressure) to maintain well control. The cylinder cap prevents hydraulic fluid leakage and protects internal components from mud contamination, solving the problem of slow BOP response and pressure loss caused by worn or damaged caps.

• Seals (O-rings, Seal Rings): Create a tight barrier between dynamic (piston rod) and static (cylinder cap, baffle plate) interfaces, preventing hydraulic fluid leakage and mud ingress. For example, the 77.5X5.3 O-ring (used for main piston tail rod and cylinder cap) resists extrusion under high pressure, avoiding the common issue of seal failure that leads to unplanned downtime. The 300×5.3 O-ring is specifically designed to handle the high pressure between boosting hydraulic cylinders and baffle plates, solving the problem of pressure loss in critical actuation systems.

• Connectors & Fasteners: The 2C01.34 Z1 internal Hex Plug and 2C02.03.03 Screw 1 3/4-8UN-2Ax405 ensure secure, leak-proof connections, withstanding vibration and torque during drilling operations—eliminating the risk of loose components that can cause system failure. Z1″ Connectors and Oil blocks (2CB.03A.01/2CB.02A.01) maintain smooth hydraulic fluid flow in pipeline assemblies, preventing pressure drops and ensuring consistent BOP actuation.

• Structural & Wear Components: The 2C01.03.02 Connecting Plate (for FZ28-35SL Double Ram BOP) provides rigid support for BOP stack components, solving the problem of structural loosening under dynamic loads. Wear rings (2C01.49, 2C01.03.11) reduce friction between moving parts, extending the service life of pistons and tail rods by 12–18 months compared to standard wear parts, and avoiding costly component replacements.

• BOP-Specific Spare Parts: Parts like FH1821NL-00, H07.00, and SKF15-238-01.00 are direct drop-in replacements for FH Series Annular BOPs, ensuring seamless integration and reducing maintenance time—solving the problem of incompatible parts that delay repairs and increase operational costs.

2.3 Structural Features

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

• Material Selection: Metallic components (hydraulic cylinders, connecting plates, screws, plugs) are forged from alloy steel with heat treatment, achieving a minimum tensile strength of 800 MPa and hardness of HRC 22–32—meeting NACE MR0175 requirements to resist sulfide stress cracking (SSC) in sour service. Seals use high-quality elastomers (FKM, NBR, EPDM) tailored to their application: FKM seals (for 77.5X5.3, 112X7 O-rings) withstand temperatures up to 200°C and resist chemical attack from drilling mud, while NBR seals (for 43.7X3.55 O-ring) offer excellent oil resistance for nozzle flange applications. All elastomers have a Shore A hardness of 70–90, ensuring optimal compression and sealing performance.

• Precision Manufacturing: O-rings feature precision-machined gland dimensions with a tolerance of ±0.05 mm, ensuring a squeeze rate of 15–25% to prevent extrusion under pressures up to 15,000 PSI—solving the common issue of seal failure due to poor fit. Threaded components (Z1 internal Hex Plug, 1 3/4-8UN-2Ax405 Screw) comply with API 5CT thread standards, with a zinc-nickel coating (20–25 μm thickness) to resist corrosion in saltwater and mud environments. Hydraulic cylinder inner surfaces are珩磨 (honed) to a surface roughness of Ra 0.2–0.4 μm, reducing friction and extending seal life.

• Design Optimization: Hydraulic cylinder caps include integrated pressure relief grooves to reduce stress concentration, preventing cracking under high pressure. Wear rings are equipped with lubrication grooves to minimize friction and heat generation, reducing component wear by 30% compared to standard designs. Connecting plates (2C01.03.02) feature bolt-hole reinforcement to withstand dynamic loads during BOP operation, avoiding deformation and loosening. Oil blocks (2CB.03A.01/2CB.02A.01) have a compact design with internal flow channels optimized for minimal pressure loss, ensuring efficient hydraulic fluid delivery.

2.4 Applicable Working Conditions

All parts are designed to perform reliably in the harshest oilfield environments, matching the operational requirements of FZ28-35SL Double Ram BOP and FH Series Annular BOPs:

• Pressure Range: 2,000–15,000 PSI, compatible with API 6A PSL 3/4 and API 16A PR2 ratings—suitable for high-pressure drilling operations where standard parts may fail.

• 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 maintain integrity at high temperatures (+200°C) to avoid melting or degradation.

• Environment: Resistant to H₂S (up to 0.0005 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).

• System Compatibility: Direct drop-in replacement for FZ28-35SL Double Ram BOP, FH18/FH23/FH28/FH35/FHZ Series Annular BOPs, and compatible with drilling equipment from Weatherford, Honghua (宏华), and Jereh (杰瑞)—eliminating the need for custom modifications and ensuring quick installation.

2.5 Maintenance & Care Recommendations

To maximize the service life of these spare parts and ensure BOP system reliability, our engineering team recommends the following practical guidelines (based on 15+ years of oilfield maintenance experience):

• Inspection Schedule: Conduct visual and pressure tests every 30 days during routine operations. Check for signs of leakage, corrosion, or wear (e.g., O-ring swelling, screw thread galling, cylinder scratches). Perform a comprehensive disassembly inspection every 6 months or 500 BOP cycles (whichever comes first) to replace worn components before they fail.

• Seal Maintenance: Replace O-rings and seal rings 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. Store seals in airtight packaging to prevent UV degradation and dust contamination.

• Component Care: Clean hydraulic cylinder caps, connecting plates, and pipeline assemblies with non-abrasive solvents (e.g., mineral spirits) to remove mud residue—abrasive cleaners can scratch surfaces and damage seals. Lubricate threaded connectors and wear rings with high-temperature lithium-based grease before installation to reduce friction and prevent thread galling.

• 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) to prevent degradation.

• Replacement Criteria: Replace hydraulic cylinders if internal leakage exceeds 0.5 L/min at rated pressure. Replace connecting plates if bolt holes show wear or deformation (more than 0.1 mm deviation from standard size). Replace BOP-specific spare parts if they exhibit corrosion, deformation, or loss of dimensional accuracy—using damaged parts can lead to BOP failure and well control incidents.

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 (2C02.03.02 Boosting Hydraulic Cylinder, 77.5X5.3 O-ring)
Fault: Slow ram closure (15 seconds vs. standard 5 seconds) and hydraulic leakage at the cylinder cap; diagnosed as O-ring extrusion and cylinder seal wear due to high mud contamination (10,000 mg/L particulate).
Load & Data: Operating pressure: 10,000 PSI; temperature: 95°C; mud type: oil-based mud (OBM); daily BOP cycles: 25.
Repair & Outcome: Replaced the 77.5X5.3 O-ring with our high-extrusion-resistant FKM seal and 2C03.03.09 Hydraulic Cylinder Cap; cleaned the hydraulic system and replaced the filter. Restoration time: 4 hours. Post-repair: Ram closure time reduced to 4.5 seconds; no leakage detected during a 24-hour pressure test. Client Feedback: “These parts eliminated 80% of our planned maintenance downtime and restored full BOP functionality—we haven’t had a seal failure in 6 months, saving us $15,000 in replacement costs.”

Case 2: Offshore Platform, South China Sea

Equipment: FH28-35NL Annular BOP (300×5.3 O-ring, 2C01.03.04 Baffle Plate)
Fault: Annular BOP seal failure (pressure loss of 2,000 PSI) and baffle plate loosening; diagnosed as O-ring swelling (due to incompatible hydraulic fluid) and bolt corrosion in sour service (H₂S partial pressure: 0.0005 MPa).
Load & Data: Operating pressure: 8,000 PSI; temperature: 130°C; environment: sour service, 30 m water depth; BOP age: 3 years.
Repair & Outcome: Replaced the 300×5.3 O-ring with our NACE-compliant EPDM seal and 2C01.03.04 Baffle Plate; retorqued bolts with anti-corrosion coating. Restoration time: 6 hours. Post-repair: Pressure retention restored to 10,000 PSI; no leakage observed over 72 hours of operation. Client Feedback: “The parts fit perfectly and prevented a potential well control incident. Having a reliable supplier for BOP spares is critical for offshore operations—we’ll be ordering all our future parts from here.”

Case 3: Workover Rig, Abu Dhabi, Middle East

Equipment: FZ28-35SL Double Ram BOP (2C01.34 Z1 internal Hex Plug, 2C02.03.03 Screw 1 3/4-8UN-2Ax405)
Fault: Plug leakage and connector loosening; diagnosed as thread galling and seal degradation due to high temperature (150°C) and frequent assembly/disassembly (15 times/month).
Load & Data: Operating pressure: 7,500 PSI; temperature: 150°C; assembly frequency: 15 times/month; mud type: water-based mud (WBM).
Repair & Outcome: Replaced the Z1 internal Hex Plug with our heat-resistant alloy plug and 2C02.03.03 Screw with anti-galling coating; applied thread locker to all connections. Restoration time: 3 hours. Post-repair: No leakage detected during 72-hour operation; assembly/disassembly time reduced by 30%. Client Feedback: “The anti-galling screws have been a game-changer—we no longer spend hours replacing stripped threads, and maintenance time is cut by 2 hours per BOP.”

Case 4: Arctic Drilling Rig, Siberia, Russia

Equipment: FH35-35 Annular BOP (43.7X3.55 Oring, 2C01.49 Wear Rings)
Fault: Packing element wear and slow annular closure (20 seconds vs. standard 6 seconds); diagnosed as wear ring abrasion and O-ring hardening due to low temperature (-35°C).
Load & Data: Operating pressure: 6,000 PSI; temperature: -35°C; mud type: water-based mud (WBM); daily BOP cycles: 18.
Repair & Outcome: Replaced the 43.7X3.55 Oring with our low-temperature-resistant NBR seal and 2C01.49 Wear Rings with lubrication grooves; preheated components to 10°C before installation (per our engineer’s recommendation). Restoration time: 5 hours. Post-repair: Annular closure time reduced to 5.8 seconds; no wear detected after 100 cycles. Client Feedback: “These parts perform reliably in arctic conditions—we don’t have to worry about O-ring hardening or wear, even at -35°C. The lubrication grooves on the wear rings have extended component life by 12 months.”

5. Procurement Guidance & Technical Reference

This spare parts suite is designed to simplify procurement and maintenance for FZ28-35SL Double Ram BOP and FH Series Annular 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:

• Procurement Standards: All parts are categorized by BOP model and component type, with clear part numbers (e.g., 2C02.03.02, FH1821NL-00) for easy ordering. We offer pre-packaged maintenance kits (e.g., seal kits, wear kits) for routine overhauls, reducing procurement time and costs. 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., 2C02.03.03 Screw: 180 N·m), and troubleshooting guides for common issues (e.g., leakage, slow actuation). Our engineering team is available to provide custom technical advice for unique operating conditions (HPHT, sour service, subsea).

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 custom-modified components, we are committed to providing the parts you need to keep your BOP systems running reliably. Contact our sales team to discuss your specific BOP model, operating conditions, and maintenance requirements—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