Introduction
This guide is exclusively tailored for the FZ54-35U Ram Blowout Preventer (BOP), a high-performance well control device designed to meet the rigorous demands of medium to high-pressure oil and gas drilling operations. It caters to the specialized needs of drilling contractors, on-site maintenance technicians, and procurement specialists, focusing on the model’s unique part ecosystem—including 2C22 series pipe rams, SBR5435CA shear rams, VBR5435CA variable bore rams, and 2C27A01 operating piston assemblies. Its core purpose is to serve as a dual-functional reference: providing precise part compatibility, procurement benchmarks, and inventory optimization strategies, while delivering actionable technical solutions for on-site fault diagnosis, repairs, and routine maintenance. Compliant with API Spec 16A (Wellhead and Christmas Tree Equipment), ANSI/ASME standards, and Chinese national standards (GB/T77), this guide ensures FZ54-35U operations adhere to strict industry safety protocols, minimize unplanned downtime, and maximize operational efficiency. Whether for daily upkeep, emergency repairs, or bulk parts sourcing, the content integrates field-validated experience and authoritative technical insights to safeguard wellbore integrity and personnel safety.
Product Overview
The FZ54-35U is a versatile Ram BOP engineered for 35 MPa working pressure, ideal for onshore and shallow offshore drilling projects that require reliable well control across diverse pipe sizes. Available in single-ram and double-ram configurations, it offers flexible safety solutions: the single-ram model delivers cost-effective performance for standard drilling scenarios, while the double-ram variant provides enhanced redundancy for high-risk wells with unstable formation pressure. A standout feature of the FZ54-35U is its comprehensive ram system, including 2C22.01 series pipe rams (covering blind, 5″, 5 1/2″, 13 3/8″ sizes), SBR5435CA shear rams for emergency pipe cutting, and VBR5435CA variable bore rams (2 7/8”-5 7/8”) for multi-size adaptability. Core components—such as 2C27A01.13.00 operating piston assemblies, intermediate flange seal assemblies (2C22A01.31.00), layered main piston sealing systems, and secondary sealing devices—are engineered for durability, interchangeability, and easy maintenance under corrosive drilling conditions. The model’s standardized part numbering system (2C22 for core BOP parts, 2C27 for piston assemblies, SBR/VBR for specialized rams) simplifies part identification and inventory management.
Functional Description
The FZ54-35U delivers precise, reliable well control through coordinated operation of its specialized components, tailored to 35 MPa pressure requirements:
Multi-Type Ram Control: Pipe rams (2C22.01 series) provide targeted sealing for specific pipe sizes and blind closure, with dedicated ram bodies and front rubber cores, plus shared top rubber cores (2C22.01A.03.00) across all pipe ram types. Shear rams (SBR5435CA.00) enable emergency pipe cutting and post-cut sealing, featuring distinct left/right seals, a dedicated top rubber core (different from pipe rams), and a blade seal for enhanced integrity. Variable bore rams (VBR5435CA.00) adapt to multiple pipe sizes, reducing the need for frequent ram replacements.
Layered Sealing Protection: The sealing system integrates multiple defensive layers: intermediate flange seal assemblies (2C22A01.31.00) prevent bonnet leakage; main piston front rod seals (SKZF171.01 series, 2C22A01 reinforced/fastened rings, backup rings) and tail rod seals (SKZF101.01, 100.97×5.33 O-rings) safeguard hydraulic fluid integrity; and the secondary sealing device (2C01.07 check valves, 2C01.20 cocks) allows on-site injection of EM-09-1/L25mm grease for quick leak remediation without disassembly.
Hydraulic Actuation & Locking: 2C27A01.13.00 operating piston assemblies drive smooth ram movement, integrated with piston rods, backup rings (C664-79), and stop blocks secured by GB/T77 M12×20 screws. Ram closing/opening pistons (2C22A01.26, 2C22A01.25) and ram change cylinders (2C22A01.24) enable precise actuation, while locking screw housings (2C22A01.12.00) and locking screws (2C22A01.11) secure ram positions under pressure to prevent accidental displacement.
Precision Guidance & Alignment: Guide pins (2C22A01.18) and guide rings ensure accurate ram movement, reducing friction and extending component service life. Backup rings (C664-79 in multiple sizes) prevent seal extrusion under high pressure, maintaining piston stability and sealing performance.
Structural Features
The FZ54-35U features a modular, maintenance-friendly design optimized for reliability, pressure resistance, and ease of service:
Specialized & Standardized Part Ecosystem: Core components follow a consistent naming convention, with 2C22 series parts for ram assemblies, sealing systems, and structural components, and 2C27 series for piston assemblies. Shared parts (e.g., 2C22.01A.03.00 pipe ram top rubber cores, 2C01 series valves/cocks) reduce inventory complexity, while specialized parts (SBR5435CA shear ram seals, VBR5435CA variable ram cores) ensure precise compatibility and performance.
Robust Pressure-Resistant Sealing: Sealing systems combine O-rings, reinforced/fastened rings, lip rings (C003-22 Ф430×Ф470×23/25), and backup rings to withstand 35 MPa pressure. Intermediate flange seals and piston seals are engineered for tight fits, with backup rings preventing extrusion and gaskets (SKZF171.02) enhancing sealing integrity.
Modular Piston & Ram Design: The 2C27A01.13.00 operating piston assembly and ram systems feature modular construction, allowing technicians to replace individual parts (stop blocks, O-rings, rubber cores) without full disassembly. This reduces maintenance time and enables quick field repairs.
User-Centric Accessibility: Key wear components—seals, gaskets, guide pins—are strategically positioned for easy access. Bonnet screws (2C22A01.19) and intermediate flange screws (2C22A01.22) use standardized fasteners, enabling technicians to use common tools for disassembly and reassembly.
Applicable Operating Conditions
The FZ54-35U (single/double ram) is optimized for 35 MPa medium to high-pressure drilling scenarios, with specific applicability to the following conditions:
Pressure & Temperature Range: Rated for 35 MPa working pressure and ambient temperatures from -20°C to 120°C (-4°F to 248°F), compatible with water-based mud (WBM), oil-based mud (OBM), and synthetic-based mud (SBM) commonly used in onshore and shallow offshore drilling.
Pipe Size Adaptability: Accommodates a wide range of pipe sizes—2 7/8”-5 7/8” (via variable bore rams), 5″, 5 1/2″, 13 3/8” (via fixed pipe rams), and blind closure—making it suitable for wells with complex casing programs and diverse drill pipe dimensions.
Well Types & Operations: Ideal for onshore oil and gas wells, shallow offshore platforms, and jack-up rigs, particularly in regions with moderate to high formation pressure fluctuations. Its shear ram and secondary sealing capabilities make it reliable for emergency well control scenarios.
Environmental Resilience: Seals and metal components (2C22 series flanges, 2C27 piston assemblies, ANSI/ASME lifting eyes) resist corrosion from drilling fluids, saltwater, and harsh atmospheric conditions, ensuring consistent performance in diverse field environments.
Maintenance & Care Recommendations
Proactive maintenance is critical to extending the service life and ensuring the reliability of FZ54-35U BOPs. Below are model-specific best practices aligned with API Spec 16A and relevant standards:
Regular Inspection Schedules: Conduct weekly visual checks of intermediate flange seals, hydraulic connections, ram rubber cores, and locking screws for leaks, corrosion, or wear. Perform quarterly disassembly inspections of piston assemblies, shear ram blades, and secondary sealing devices—replace worn parts per the one-year spare parts list.
Seal Maintenance: Replace intermediate flange seal assemblies (2C22A01.31.00) and SKZF101.01 tail rod seals every 6 months or if cracks/deformation are detected. Inspect SKZF171.01 front rod sealing rings and 2C22A01 reinforced/fastened rings monthly; replace the entire set if any component is worn. Inject EM-09-1/L25mm grease every 3 months to maintain secondary seal integrity.
Ram & Piston Care: Clean ram components (rubber cores, bodies, shear blades) after each use to remove drilling fluid residue. Verify ram assembly part numbers match the pipe size (e.g., 2C22.01D.00 for 13 3/8”) before installation. Lubricate guide pins (2C22A01.18) monthly with anti-corrosion lubricant to prevent jamming.
Hydraulic & Actuation Maintenance: Inspect lip rings (C003-22) and backup rings (C664-79) monthly for damage. Replace hydraulic O-rings (97.79×5.33, 120.02×5.33) if leaks occur, and torque bonnet screws (2C22A01.19) and intermediate flange screws (2C22A01.22) to manufacturer specifications. Check locking screws (2C22A01.11) for tightness during each inspection.
Auxiliary Component Care: Clean 2C01.07 check valves and 2C01.20 cocks quarterly to prevent clogging from dried grease or debris. Inspect lifting eyes (ANSI/ASME B18.15) for structural integrity annually, and replace worn studs (2C22A01.14) and nuts (EB31.1-05H) to maintain assembly stability.
Parts of pipe ram
Ram Type | Description (quantity) of pipe ram assembly | |||
Ram assembly | Ram body (2) | Front rubber core (2) | Top rubber core (2) | |
Blind | 2C22.01A.00 | 2C22.01A.01 | 2C22.01A.02.00 | 2C22.01A.03.00 |
5″ | 2C22.01B.00 | 2C22.01B.01 | 2C22.01B.02.00 | 2C22.01A.03.00 |
5 1/2" | 2C22.01C.00 | 2C22.01C.01 | 2C22.01C.02.00 | 2C22.01A.03.00 |
13 3/8" | 2C22.01D.00 | 2C22.01D.01 | 2C22.01D.02.00 | 2C22.01A.03.00 |
Parts list of shear ram assembly
Description | P/N |
Left seal | SBR5435CA.04.00 |
Lower shear ram body | SBR5435CA.01 |
Right seal | SBR5435CA.03.00 |
Top rubber core | SBR5435CA.02.00 |
Upper shear ram body | SBR5435CA.05 |
Blade seal of shear ram | SBR5435CA.06.00 |
Parts list of Variable Bore Ram
Description | P/N |
Ram body | VBR5435CA.01 |
Top rubber core | VBR5435CA.02.00 |
Front rubber core | VBR5435CA.03.00 |
List of sealing parts for front rod of main piston
Description | P/N |
O-ring | 2C22A01.30 |
Back-up Ring | 2C22A01.32 |
Fastened sealing ring | 2C22A01.28 |
Reinforced sealing ring | 2C22A01.29 |
Gasket | SKZF171.02 |
Sealing ring of front rod of main piston | SKZF171.01 |
Gasket | 2C22A01.21 |
Retainer ring 210 | 2C22A01.20 |
Parts list of secondary sealing device
Description | P/N |
Z1″ External hexagonal blocking | 2C01.21 |
Cock 1-8UNC | 2C01.20 |
Secondary sealing grease | EM-09-1/L25mm |
Check valve | 2C01.07 |
Z1/2″ hexagon socket screw plug | 2C01.32 |
List of sealing parts for tail rod of main piston
Description | P/N |
Sealing ring of front rod of main piston | SKZF101.01 |
O-ring | 100.97×5.33 |
Parts list of seal (side door sealing ring) assembly of middle flange
Description | P/N |
Flange seal assembly | 2C22A01.31.00 |
Description | Part No/Model |
Screw 1/2-13UNC×1 1/4 | 2C01.26 |
Nozzle flange | 2C27A01.34 |
O-ring（Nozzle flange） | 43.7×3.55 |
Body | 1 |
Intermediate Flange Seal Assembly | 2C22A01.31.00 |
Ram assembly | 2C22A01.01().00 |
Sealing part for front rod of main piston | See 3.2.5 Table3-4 |
Guide pin | 2C22A01.18 |
Secondary seal | See 3.2.6 Table3-5 |
Intermediate Flange | 2C27A01.17 |
Guide Ring | N/A |
Back-up ring | C664-79 Ф121.36×Ф130.66×1.52 |
O-ring（Ram Change piston / Body） | 97.79×5.33 |
O-ring（Ram Change piston to Intermediate Flange） | 120.02×5.33 |
Ram Closing Piston | 2C22A01.26 |
O-ring（Change Cylinder/Intermediate Flange） | 170.82×6.99 |
O-ring （Change Cylinder/Bonnet） | 183.52×6.99 |
Ram Change Cylinder | 2C22A01.24 |
Lifting eye 1 1/8-8UN | ANSI/ASME B18.15 |
Seal Gland | 2C01.16 |
Seal Plug | 2C01.15 |
O-ring | 116.84×5.33 |
Bonnet Screw | 2C22A01.19 |
Bonnet | 2C22A01.15 |
Stud | 2C22A01.14 |
Nut | EB31.1-05H 2-8UN-2B |
Locking Screw Housing | 2C22A01.12.00 |
Locking Screw | 2C22A01.11 |
Z1/2” Plug | 2C01.36 |
O-ring （Piston/ Bonnet） | 100.97×5.33 |
Seal ring of Tail Rod | SKZF101.01 |
Operating Cylinder | 2C22A01.23 |
Operating Piston Assembly | 2C27A01.13.00 |
Lip ring | C003-22 Ф430×Ф470×23/25 |
O-ring（Change Cylinder/Ram Change Piston） | 132.72×6.99 |
Back up ring | C664-79 Ф134.65×Ф146.63×2.44 |
O-ring （Intermediate Flange to Bonnet） （Operating Cylinder to Bonnet） | 523×7 |
Ram Opening Piston | 2C22A01.25 |
Z1” Plug | 2C01.34 |
Intermediate Flange Screw | 2C22A01.22 |
Piston Rod | 2C27A01.13.01 |
O-ring | 2C22A01.30 |
Back up ring | 2C22A01.32 |
Piston | 2C27A01.13.02 |
Stop block | C17.08.03 |
Screw | GB/T77 M12×20 |
Spare parts list for one year
Description | Part No/Model |
O-ring（Nozzle flange） | 43.7×3.55 |
Intermediate Flange Seal | 2C22A01.31.00 |
O-ring | 2C22A01.30 |
Back-up ring | 2C22A01.32 |
Fastened sealing ring | 2C22A01.28 |
Reinforced sealing ring | 2C22A01.29 |
Gasket | SKZF171.02 |
Sealing ring of front rod of main piston | SKZF171.01 |
Secondary sealing grease | 2 |
Back-up ring | C664-79 Ф121.36×Ф130.66×1.52 |
O-ring（Ram Change piston to Body） | 97.79×5.33 |
O-ring（Ram Change piston to Intermediate Flange） | 120.02×5.33 |
O-ring（Change Cylinder/Intermediate Flange） | 170.82×6.99 |
o-ring （Change Cylinder/Bonnet） | 183.52×6.99 |
O-ring | 116.84×5.33 |
O-ring (Piston / Bonnet) | 100.97×5.33 |
Seal ring of Tail Rod | SKZF101.01 |
Lip ring | C003-22 Ф430×Ф470×23/25 |
O-ring（Change Cylinder/Ram Change Piston） | 132.72×6.99 |
Back up ring | C664-79 Ф134.65×Ф146.63×2.44 |
O-ring （Intermediate Flange/Bonnet） （Operating Cylinder to Bonnet） | 523×7 |
Stop block | C17.08.03 |
Field Fault Repair Cases
The following real-world cases provide practical troubleshooting tips for common FZ54-35U faults, helping technicians resolve issues quickly and minimize downtime:
Case 1: Intermediate Flange Leakage
Symptom: Wellbore fluid leakage at the intermediate flange during 35 MPa pressure testing. Root Cause: 2C22A01.31.00 flange seal assemblies were worn and contaminated with drilling mud, compromising sealing integrity. Repair: Replaced the seal assemblies, cleaned the flange surface with a non-abrasive tool, and reinstalled the intermediate flange with calibrated torque. A follow-up pressure test confirmed no leakage.Preventive Measure: Clean the flange area post-operation and inspect seal assemblies bi-weekly.
Case 2: Main Piston Front Rod Hydraulic Leakage
Symptom: Hydraulic fluid leakage around the main piston front rod. Root Cause: SKZF171.01 sealing rings were degraded by high-temperature hydraulic fluid, and 2C22A01.32 backup rings were deformed. Repair: Replaced the entire front rod seal set (sealing rings, backup rings, reinforced/fastened rings), cleaned the piston rod to remove burrs, and inspected SKZF171.02 gaskets. Post-repair actuation was smooth with no leakage. Preventive Measure: Replace the front rod seal set every 6 months and monitor hydraulic fluid temperature.
Case 3: Variable Bore Ram Jamming
Symptom: VBR5435CA.00 variable bore ram jammed during actuation.Root Cause: Drilling fluid residue buildup on guide pins (2C22A01.18) and worn guide rings, combined with loose stop blocks (C17.08.03) in the operating piston assembly. Repair: Disassembled the ram, cleaned guide pins with a solvent, replaced guide rings, tightened stop blocks with GB/T77 M12×20 screws, and lubricated components. The ram actuated smoothly post-reassembly. Preventive Measure: Clean guide pins weekly and check stop block tightness during routine inspections.
Case 4: Secondary Sealing Grease Injection Failure
Symptom: Inability to inject EM-09-1/L25mm grease into the secondary sealing device. Root Cause: 2C01.07 check valves were clogged with dried grease and debris. Repair: Disassembled the check valves, cleaned them with a compatible solvent, flushed the grease line, and reinstalled components. Grease flow was restored immediately. Preventive Measure: Clean check valves and 2C01.20 cocks quarterly to avoid debris buildup.
FAQ
Question | Answer |
Can pipe ram top rubber cores be used for shear or variable bore rams? | No. Pipe rams use 2C22.01A.03.00 top rubber cores, while shear rams (SBR5435CA.02.00) and variable bore rams (VBR5435CA.02.00) have dedicated top rubber cores—these are not interchangeable. Shear/variable ram cores are engineered for higher pressure and friction resistance, and using pipe ram cores will cause seal failure and compromise well control. |
What is the purpose of the layered seal set for the main piston front rod? | The set (2C22A01.28/29/30/32, SKZF171.01/02) forms a multi-defense system: SKZF171.01 is the primary seal, 2C22A01.29 reinforces pressure resistance, 2C22A01.28 secures the assembly, and 2C22A01.32 backup rings prevent extrusion. Replace the entire set if any component is worn—mixing new and worn parts undermines the layered protection and causes leakage. |
How to ensure compatibility of operating piston assembly parts? | The 2C27A01.13.00 assembly requires dedicated parts: 2C27A01.13.01 piston rods, 2C22A01.30/32 O-rings/backup rings, and C17.08.03 stop blocks secured by GB/T77 M12×20 screws. Always reference the assembly parts list—backup rings must be C664-79 (specific sizes) to prevent extrusion. Non-specified parts will destabilize the piston and damage the hydraulic system. |
What critical spare parts should be stocked for double-ram FZ54-35U models? | Double-ram models require double the quantity of key wear parts from the one-year list: 2C22A01.31.00 flange seals, SKZF171.01/101.01 seals, C003-22 lip rings, and O-rings (97.79×5.33, 120.02×5.33). Prioritize shared components (C17.08.03 stop blocks, C664-79 backup rings, EM-09-1 grease) and size-specific ram parts (2C22.01 series cores, SBR5435CA seals) based on operational pipe sizes. |
Why are specialized O-rings used for different hydraulic connections? | O-rings (e.g., 170.82×6.99 for change cylinder/intermediate flange, 523×7 for bonnet connections) are sized to match specific component clearances and pressure requirements. Using the wrong O-ring (incorrect size/material) will cause leakage under 35 MPa pressure. Always match the O-ring part number to the connection type per the parts list. |
Procurement Guidance
The safety and reliability of FZ54-35U BOPs depend entirely on genuine, model-compatible parts. We supply a full range of authentic components tailored to this model, including 2C22.01 series pipe rams, SBR5435CA shear rams, VBR5435CA variable bore rams, 2C27A01.13.00 operating piston assemblies, layered seal sets, and secondary sealing devices. All parts are manufactured to API Spec 16A, ANSI/ASME, and GB standards, with traceable material certificates and batch records to ensure perfect fit, 35 MPa pressure resistance, and alignment with original equipment specifications.
For procurement, align with the one-year spare parts list to balance inventory cost and emergency response. Double quantities for double-ram models, and prioritize high-wear components (seals, backup rings, lip rings) and specialized parts (shear ram blades, variable bore cores) based on your operational pipe sizes and risk profile. Our well control experts provide free technical support to verify part compatibility, avoid mismatches, and optimize inventory. Whether you need routine spares, emergency repair parts, or bulk orders for fleet maintenance, we deliver consistent quality that meets industry safety standards. Contact us today to discuss your specific FZ54-35U requirements and secure reliable parts for your well control operations.
Conclusion
The FZ54-35U Ram BOP is a robust, versatile well control device engineered to excel in 35 MPa medium to high-pressure drilling operations. Its comprehensive ram system, layered sealing protection, and modular design make it adaptable to diverse pipe sizes and operational scenarios, from standard onshore wells to shallow offshore platforms. The model’s standardized part ecosystem and maintenance-friendly structure minimize downtime and operational costs, while its compliance with global industry standards ensures safe, reliable performance.
This guide integrates authoritative technical insights, field-proven repair cases, and procurement best practices to support technicians and procurement professionals in maintaining operational continuity. By following model-specific maintenance schedules, using genuine parts, and leveraging the FAQs and troubleshooting tips, you can maximize the FZ54-35U’s service life and mitigate operational risks. Partnering with a trusted supplier for authentic components ensures compliance with safety protocols, safeguarding personnel, assets, and wellbore integrity. Invest in quality parts and proactive maintenance to keep your FZ54-35U operating at peak performance.
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