Introduction
This guide is exclusively tailored for FZ35-35J (single ram) and 2FZ35-35J (dual ram) Ram Blowout Preventers (BOPs), addressing the specific needs of drilling contractors, on-site maintenance technicians, and procurement specialists in oil and gas well control operations. Its core purpose is to serve as a dual-functional reference—providing precise parts compatibility details for procurement planning and actionable technical solutions for on-site fault diagnosis and maintenance. Compliant with API Spec 16A (Wellhead and Christmas Tree Equipment) and Chinese national standards (GB/T70.1, GB/T893.1, etc.), this guide ensures that operations involving FZ35-35J series BOPs adhere to industry safety benchmarks, minimize unplanned downtime, and optimize spare parts inventory management. Whether for routine maintenance, emergency repairs, or bulk parts procurement, the content integrates field-validated experience and authoritative technical insights to support the stable operation of these 35 MPa (5,075 psi) rated well control devices, which are critical for safeguarding wellbore integrity and personnel safety.
Product Overview
The FZ35-35J and 2FZ35-35J Ram BOPs are medium-pressure well control systems engineered for 35 MPa working pressure, widely applied in onshore and shallow offshore drilling projects. The single-ram FZ35-35J offers cost-efficient well control for standard drilling scenarios, while the dual-ram 2FZ35-35J provides enhanced safety redundancy with two independent ram assemblies—ideal for high-risk wells with unstable formation pressure. Both models support a comprehensive range of pipe sizes (2 3/8” to 10 3/4”) through two sets of ram assemblies: the RAM3570/35 series (paired with 2FZ35105A series seals) and the DFZ1310.01 series (covering additional sizes including blind rams). Key components include shear ram assemblies, variable diameter ram assemblies, ram shaft seal systems, secondary seal systems, piston assemblies, and hinge structures—all designed for interchangeability, durability, and easy maintenance under medium-pressure, corrosive drilling conditions. The standardized part numbering system for shared components (e.g., GB/T70.1 M12 screws, SKZF135 series seals) simplifies inventory management and on-site parts replacement.
Functional Description
The FZ35-35J series BOPs deliver reliable well control functions through coordinated operation of specialized components, tailored to 35 MPa medium-pressure working conditions:
Multi-Type Ram Sealing: The system supports three ram types—pipe rams (RAM3570/35 and DFZ1310.01 series), shear rams (SBR35105SA series), and variable diameter rams (VBR35105S series). Pipe rams cover 12+ pipe sizes and blind closure, shear rams enable emergency pipe cutting and sealing, and variable diameter rams (e.g., 2 3/8”-3 1/2”, 5”-7”) adapt to multiple pipe sizes, reducing the need for multiple ram assemblies.
Layered Sealing Protection: Side door seals (SFZ1310-07-00) form the primary barrier against wellbore fluid leakage. Ram shaft seal assemblies (SKZF135.01 Y-rings, SKZF135.02 backup rings) prevent hydraulic fluid loss, while the secondary seal system (SFZ1310 series components) allows on-site EM-09-1 grease injection without disassembling the BOP, enabling quick leak remediation during operations.
Hydraulic Actuation & Locking: Piston assemblies (2FZ35105A.03-05) drive ram movement via hydraulic pressure, with U-rings (SFZ1310-13) and wear rings (SFZ1310-12) ensuring leak-proof, long-lasting actuation. Locking shaft seal assemblies (GB/T893.1 95 retainer rings, SFZ1310-23 wiper rings) secure the ram position under pressure, preventing accidental displacement.
Stable Hinge Operation: Hinge structures (2FZ3570A-03 hinge blocks, GB/T119.2 locating pins) enable safe, easy access to internal components for maintenance, with O-rings (53×5.3, 80×2.65) providing corrosion protection against drilling fluids.
Structural Features
The FZ35-35J series BOPs feature a modular, maintenance-friendly design with structural characteristics optimized for medium-pressure well control:
Dual Ram Assembly Compatibility: The model supports both RAM3570/35 and DFZ1310.01 series pipe rams, expanding pipe size coverage and ensuring flexibility for diverse drilling programs. Shared components (e.g., holders, screws) across ram series reduce inventory complexity and procurement costs.
Robust Seal Integration: Ram shaft seals combine SKZF135.01 Y-rings and SKZF135.02 backup rings to resist medium-pressure hydraulic fluid and prevent seal extrusion. Shear ram assemblies (SBR35105SA series) integrate multi-directional seals (top, front, left/right) for reliable post-shear sealing, critical for emergency well control.
Standardized Mechanical Components: Piston assemblies, hydraulic cylinders (2S99.03.04), and cylinder bolts (2S99.03.03) follow GB standards, ensuring compatibility with common drilling rig hydraulic systems and durability under cyclic loading. Variable diameter rams use standardized GB/T70.1 M12 screws, simplifying on-site installation.
User-Centric Maintenance Design: Key wear components (wiper rings, O-rings, U-seals) are strategically positioned for easy access. Clear part numbering (e.g., SFZ1310 series for seal components) helps technicians quickly identify and replace faulty parts without specialized tools, reducing maintenance time.
Applicable Operating Conditions
The FZ35-35J and 2FZ35-35J BOPs are optimized for 35 MPa medium-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 drilling.
Pipe Size Adaptability: Accommodates pipe sizes from 2 3/8” to 10 3/4” via pipe rams, with variable diameter rams covering size ranges (2 3/8”-3 1/2”, 3 1/2”-5”, etc.) to support wells with multiple casing programs and varying drill pipe diameters.
Well Types & Operations: Ideal for onshore oil and gas wells, shallow offshore wells (platform and jack-up rigs), and well completion stages. The shear ram assembly enables emergency pipe cutting for blowout prevention, making it suitable for wells with moderate formation pressure instability.
Environmental Resilience: Seals and metal components resist corrosion from drilling fluids, saltwater (offshore), and harsh atmospheric conditions, ensuring reliable performance in diverse operational environments.
Maintenance & Care Recommendations
Proactive maintenance is essential to extend the service life and ensure the reliability of FZ35-35J series BOPs. Below are practical, model-specific best practices aligned with API Spec 16A and GB standards:
Regular Inspection Schedules: Conduct weekly visual checks of side door seals, hydraulic connections, and ram shafts for leaks, corrosion, or wear. Perform quarterly disassembly inspections of piston assemblies, ram seals, and hinge structures—replace worn parts according to the one-year spare parts list.
Seal Maintenance: Replace side door seals (SFZ1310-07-00) every 6 months or if cracks, deformation, or leakage is detected. For ram shaft seals, inspect SKZF135.01 Y-rings and SKZF135.02 backup rings monthly; replace them every 80 operational cycles or 6 months, whichever comes first. Inject EM-09-1 secondary sealing grease every 3 months to maintain the secondary seal system’s functionality.
Ram Assembly Care: Clean pipe, shear, and variable diameter ram components after each use to remove drilling fluid residue. Store spare ram assemblies in a dry, dust-free area to prevent rubber degradation. Verify that ram assembly part numbers match the pipe size (e.g., RAM3570/35B.00 for 2 7/8” pipes) before installation.
Hydraulic & Piston Maintenance: Inspect piston U-rings (SFZ1310-13), wear rings (SFZ1310-12), and O-rings (106×5.3) monthly for damage. Replace hydraulic cylinder O-rings (341×7, 43.7×3.55) if leaks occur, and torque cylinder bolts (2S99.03.03) to the specified torque after disassembly.
Hinge & Locking System Care: Lubricate hinge blocks, locating pins, and bearings monthly with anti-corrosion lubricant. Check locking shaft lip rings (2FZ1870DBYS.03.22-00) and wiper rings (SFZ1310-23) quarterly—replace worn parts to prevent structural loosening under pressure.
Parts of pipe ram
Name (Qty) Pipe size | Ram Assembly | Ram Block(2) | Front Seal(2) | Top Seal(2) |
Blind | RAM3570/35A.00 | RAM3570/35A.01 | 2FZ35105A.02I.01-00 | 2FZ35105A.02A.03-00 |
2 3/8” | RAM3570/35B.00 | RAM3570/35B.01 | 2FZ35105A.02A.01-00 | 2FZ35105A.02A.03-00 |
2 7/8” | RAM3570/35C.00 | RAM3570/35C.01 | 2FZ35105A.02B.01-00 | 2FZ35105A.02A.03-00 |
3 1/2” | RAM3570/35D.00 | RAM3570/35D.01 | 2FZ35105A.02C.01-00 | 2FZ35105A.02A.03-00 |
4” | RAM3570/35E.00 | RAM3570/35E.01 | 2FZ35105A.02L.01-00 | 2FZ35105A.02A.03-00 |
4 1/2” | RAM3570/35F.00 | RAM3570/35F.01 | 2FZ35105A.02D.01-00 | 2FZ35105A.02A.03-00 |
5″ | RAM3570/35H.00 | RAM3570/35H.01 | 2FZ35105A.02E.01-00 | 2FZ35105A.02A.03-00 |
5 1/2″ | RAM3570/35I.00 | RAM3570/35I.01 | 2FZ35105A.02F.01-00 | 2FZ35105A.02A.03-00 |
7″ | RAM3570/35N.00 | RAM3570/35N.01 | 2FZ35105A.02G.01-00 | 2FZ35105A.02A.03-00 |
7 5/8” | RAM3570/35O.00 | RAM3570/35O.01 | 2FZ35105A.02J.01-00 | 2FZ35105A.02A.03-00 |
9 5/8” | RAM3570/35S.00 | RAM3570/35S.01 | 2FZ35105A.02H.01-00 | 2FZ35105A.02A.03-00 |
10 3/4″ | RAM3570/35T.00 | RAM3570/35T.01 | 2FZ35105A.02K.01-00 | 2FZ35105A.02A.03-00 |
Parts of pipe ram
Pipe Size | Pipe Ram Assembly Name(Qty) | |||||
Ram Assembly (2) | Ram Block(2) | Screw (4) | Holder(2) | Screw(4) | Packer(2) | |
5" | DFZ1310.01A-00 | DFZ1310.01A-03 | GB70 M12×65 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01A.01-00 |
4 1/2" | DFZ1310.01B-00 | DFZ1310.01B-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01B.01-00 | |
3 1/2" | DFZ1310.01C-00 | DFZ1310.01C-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01C.01-00 | |
7" | DFZ1310.01D-00 | DFZ1310.01D-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01D.01-00 | |
Blind | DFZ1310.01E-00 | DFZ1310.01E-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01E.01-00 | |
9 5/8" | DFZ1310.01F-00 | DFZ1310.01F-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01F.01-00 | |
2 7/8" | DFZ1310.01G-00 | DFZ1310.01G-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01G.01-00 | |
5 1/2" | DFZ1310.01H-00 | DFZ1310.01H-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01H.01-00 | |
2 3/8" | DFZ1310.01L-00 | DFZ1310.01L-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01L.01-00 | |
10 3/4" | DFZ1310.01M-00 | DFZ1310.01M-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01M.01-00 | |
4 3/4" | DFZ1310.01N-00 | DFZ1310.01N-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01N.01-00 | |
5 3/4" | DFZ1310.01P-00 | DFZ1310.01P-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01P.01-00 | |
4" | DFZ1310.01I-00 | DFZ1310.01I-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01I.01-00 | |
7 5/8" | DFZ1310.01Q-00 | DFZ1310.01Q-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01Q.01-00 | |
6 5/8" | DFZ1310.01R-00 | DFZ1310.01R-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01R.01-00 | |
5 7/8" | DFZ1310.01S-00 | DFZ1310.01S-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01S.01-00 | |
8 5/8" | DFZ1310.01T-00 | DFZ1310.01T-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01T.01-00 | |
9 7/8" | DFZ1310.01U-00 | DFZ1310.01U-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01U.01-00 | |
7 7/8“ | DFZ1310.01V-00 | DFZ1310.01V-02 | DFZ1310.01A-02 | DFZ1310.01A-04 | DFZ1310.01V.01-00 |
Parts list of shear ram assembly
Description | P/N |
Lower shear ram body | SBR35105SA.01 |
Top Seal | SBR35105SA.04.00 |
Right Seal | SBR35105SA.05.00 |
Front Seal | SBR35105SA.03.00 |
Left Seal | SBR35105SA.06.00 |
Upper shear ram body | SBR35105SA.02 |
Parts list of variable diameter ram assembly
Name (Qty.) P/N | Front Seal(2) | Top Seal(2) | Ram body(2) | Screw(2) |
5" - 7" VBR35105SA.00 | VBR35105SA.02.00 | VBR35105SA.03.00 | VBR35105SA.01.00 | GB/T70.1 M12×85 |
3 1/2" - 5" VBR35105SB.00 | VBR35105SB.02.00 | VBR35105SA.03.00 | VBR35105SB.01.00 | GB/T70.1 M12×112 |
2 3/8"-3 1/2" VBR35105SC.00 | VBR35105SC.02.00 | VBR35105SA.03.00 | VBR35105SC.01.00 | GB/T70.1 M12×130 |
4 1/2"-5 1/2" VBR35105SD.00 | VBR35105SD.02.00 | VBR35105SA.03.00 | VBR35105SD.01.00 | GB/T70.1 M12×85 |
Part list of Ram Shaft Seal Assembly
Description | P/N |
Retainer ring | SFZ1310-48a |
Gasket | 2FZ35105A.03-11 |
Packing Washer | 2FZ35105A.03-12 |
Y-ring for shaft seal of Ram | SKZF135.01 |
Backup ring | SKZF135.02 |
Packing Bearing Ring | SFZ1310-20 |
Bushing | 2FZ35105A.03-13 |
O-ring | 150×3.55 |
O-ring | 136×3.55 |
Parts list of Secondary Seal System
Description | P/N |
Z1″ External hexagonal blocking | SFZ1310-04 |
Cock | SFZ1310-30 |
Secondary sealing grease | EM-09-1 |
Check Value | SFZ1310.32-00 |
Z1/2″ Internal hexagonal plug screw with hole | SFZ1310-49 |
Parts list of Locking Shaft Seal Assembly
Description | P/N |
Retainer Ring | GB/T893.1 95 |
Thrust Shaft Sleeve | SFZ1310-21 |
Lip ring cover | 2FZ1870DBYS.03-23 |
Lip ring | 2FZ1870DBYS.03.22-00 |
Wiper Seat Retainer | SFZ1310-22 |
Wiper Ring | SFZ1310-23 |
Parts list of Hinge structure
Description | Part No./Model |
Hinge Block | 2FZ3570A-03 |
Locating Pin | GB/T119.2 A20×100 |
Screw | GB70.1 M24×130 |
O Ring | 53×5.3 |
O Ring | 80×2.65 |
Parts list of Piston Assembly
Description | Part No./Model |
Piton | 2FZ35105A.03-05 |
Wear ring | SFZ1310-12 |
U-ring | SFZ1310-13 |
O-ring | SFZ1310-14 |
O-ring | 106×5.3 |
Screw | GB71 M10×25 |
Locking nut | SFZ1310-15 |
No. | Description | Part No./Model | Qty. (Single) | Qty. (Double) |
1 | Body | 1 | 1 | |
2 | Ram Assembly | DFZ1310.01()-00 | -- | -- |
3 | Door bolt | 2S99.03.02 | 16 | 32 |
4 | O-ring | 53×5.3 | 8 | 16 |
5 | Taper pin | GB/T118 A20×100 | 8 | 16 |
6 | Screw | GB/T70.1 M24×125 | 16 | 32 |
7a | Hinge Block | 2FZ3570A-03 | 4 | 8 |
8 | O-ring | 43.7×3.55 | 6 | 12 |
9 | Plug | 2C01.21 | 2 | 4 |
10 | Screw | GB5782 M12×40 | 8 | 16 |
11 | Nozzle flange | 2FZ2870-12 | 2 | 4 |
12 | Right Cylinder head | 2FZ3570A.02-03 | 1 | 2 |
Left Cylinder head | 2FZ3570A.04-02 | 1 | 2 | |
13 | O-ring | 341×7 | 4 | 8 |
14 | Locking Shaft Seal Assembly | See 3.2.7 | -- | -- |
15 | Hydraulic cylinder | 2S99.03.04 | 2 | 4 |
16 | Piston Assembly | See 3.2.10 | -- | -- |
17 a | Right Door | 2S99.03.01.00 | 1 | 2 |
Left Door | 2S99.04.01.00 | 1 | 2 | |
18 | Secondary Seal System | See 3.2.6 | -- | -- |
19 | Ram Shaft Seal Assembly | See 3.2.5 | -- | -- |
20 | Locating Pin | SFZ1310-50 | 2 | 4 |
21 | Ram shaft | 2S99.03.05 | 2 | 4 |
22 | Side Door Seal | SFZ1310-07-00 | 2 | 4 |
23 | O-ring | 80×2.65 | 4 | 8 |
24 | O-ring | 31.5×3.55 | 8 | 16 |
25 | Cylinder Manifold | 2S99.03.07 | 2 | 4 |
26 | Locking screw | 2FZ35105A.03-08 | 2 | 4 |
27 | Plug | SFZ1310-01 | 6 | 12 |
28 | Cylinder Bolt | 2S99.03.03 | 16 | 32 |
29 | Cap Nut | 2S95.03.08 | 16 | 32 |
Spare Parts list for one year
Description | Single Ram BOP Part No./Model |
O-ring | 53×5.3 |
O-ring | 43.7×3.55 |
O-ring | 341×7 |
Lip ring cover | 2FZ1870DBYS.03-23 |
Lip ring | 2FZ1870DBYS.03.22-00 |
Wiper ring | SFZ1310-23 |
Wear ring | SFZ1310-12 |
U-seal | SFZ1310-13 |
O-ring | SFZ1310-14 |
O-ring | 106×5.3 |
Secondary sealing grease | EM-09-1 |
Wiper ring | 2FZ35105A.03-11 |
Y-ring | SKZF135.01 |
Backup ring | SKZF135.02 |
O-ring | 150×3.55 |
O-ring | 136×3.55 |
D-ring | SFZ1310-07-00 |
O-ring | 80×2.65 |
O-ring | 31.5×3.55 |
Field Fault Repair Cases
The following real-world cases provide practical troubleshooting tips for common faults in FZ35-35J series BOPs, helping technicians resolve issues quickly and reduce downtime:
Case 1: FZ35-35J Side Door Seal Leakage
Symptom: Wellbore fluid leakage at the side door during 35 MPa pressure testing. Root Cause: The side door seal (SFZ1310-07-00) was worn and contaminated with dried drilling mud, compromising the sealing surface. Repair: Replaced the side door seal, cleaned the seal groove with a non-abrasive tool to remove residue, and reinstalled the door bolt (2S99.03.02) with calibrated torque. A follow-up pressure test confirmed no leakage. Preventive Measure: Clean the side door seal area after each well operation and inspect the seal bi-weekly.
Case 2: 2FZ35-35J Ram Shaft Hydraulic Leakage
Symptom: Hydraulic fluid leakage around the ram shaft seal assembly. Root Cause: SKZF135.01 Y-rings were degraded by high-temperature drilling fluid, and SKZF135.02 backup rings were deformed. Repair: Replaced the Y-rings and backup rings, cleaned the ram shaft to remove burrs, and inspected the bushing (2FZ35105A.03-13) for damage. Post-repair actuation was smooth with no leakage. Preventive Measure: Replace ram shaft seal components every 6 months, and monitor fluid temperature to avoid premature seal degradation.
Case 3: FZ35-35J Variable Diameter Ram Jamming
Symptom: VBR35105SB.00 variable diameter ram (3 1/2”-5”) jammed during actuation. Root Cause: Drilling fluid residue buildup between the ram body and housing, combined with loose GB/T70.1 M12×112 screws. Repair: Disassembled the ram assembly, cleaned all components with a solvent to remove residue, tightened the screws to specification, and lubricated the ram body. The ram actuated smoothly after reassembly. Preventive Measure: Clean variable diameter rams after each size change and check screw tightness weekly.
Case 4: 2FZ35-35J Secondary Seal Grease Injection Failure
Symptom: Unable to inject EM-09-1 grease into the secondary seal system. Root Cause: The check valve (SFZ1310.32-00) was clogged with dried grease and debris. Repair: Disassembled the check valve, cleaned it thoroughly with a compatible solvent, reinstalled the component, and injected fresh EM-09-1 grease. Grease flow was restored immediately. Preventive Measure: Clean the check valve and injection channel quarterly to avoid debris buildup.
FAQ (Frequently Asked Questions)
Question | Answer |
Can FZ35-35J use both RAM3570/35 and DFZ1310.01 series ram assemblies interchangeably? | Yes, the FZ35-35J is designed to be compatible with both ram series. RAM3570/35 series pairs with 2FZ35105A series seals, while DFZ1310.01 series covers additional sizes (e.g., 4 3/4”, 5 3/4”). Ensure the ram assembly part number matches the pipe size, and use the corresponding seals—shared components like holders and screws can be used across both series. |
What is the difference between shear rams and variable diameter rams for FZ35-35J? | Shear rams (SBR35105SA series) are for emergency pipe cutting and sealing, critical for blowout prevention. Variable diameter rams (VBR35105S series) adapt to multiple pipe sizes (e.g., 2 3/8”-3 1/2”), reducing the need to stock multiple fixed-size rams. Use shear rams for high-risk wells and variable diameter rams for wells with multiple pipe sizes to optimize inventory. |
Can I substitute SKZF135.01 Y-rings with other brands for the ram shaft seal assembly? | No, substitution is not recommended. SKZF135.01 Y-rings are engineered to match the FZ35-35J’s ram shaft dimensions and 35 MPa pressure rating. Non-genuine Y-rings may not resist hydraulic fluid pressure, leading to leakage or seal failure. Always pair SKZF135.01 Y-rings with SKZF135.02 backup rings for optimal performance. |
How to select spare parts for 2FZ35-35J dual-ram BOPs? | The 2FZ35-35J has two independent ram systems, so stock double the quantity of ram-specific parts (e.g., Y-rings, piston seals, side door seals) compared to the single-ram FZ35-35J. Follow the one-year spare parts list, prioritizing high-wear components like O-rings (53×5.3, 106×5.3), U-seals (SFZ1310-13), and EM-09-1 grease. |
What maintenance should be done before switching pipe sizes with variable diameter rams? | Before switching sizes, clean the ram body and housing to remove drilling fluid residue. Inspect front/top seals (e.g., VBR35105SB.02.00) for wear or damage—replace if necessary. Check the tightness of GB/T70.1 M12 screws and lubricate the ram body to ensure smooth actuation. Verify that the variable diameter range matches the new pipe size to avoid jamming. |
Procurement Guidance
The safety and reliability of FZ35-35J and 2FZ35-35J BOPs depend entirely on genuine, model-compatible parts. We supply a full range of authentic components tailored to these models, including RAM3570/35 and DFZ1310.01 series ram assemblies, SBR35105SA shear rams, VBR35105S variable diameter rams, seal systems (SKZF135 series, SFZ1310 series), piston assemblies, and hinge components—all manufactured to API Spec 16A and GB standards, with traceable material certificates and batch records.
Our parts ensure perfect fit and 35 MPa pressure resistance, matching the original equipment specifications of FZ35-35J series BOPs. For procurement, we recommend following the one-year spare parts list to balance inventory cost and emergency response capability. For dual-ram 2FZ35-35J, double the quantity of key wear components to account for its two independent ram systems. Our team of well control experts provides free technical support for parts selection, helping you avoid compatibility issues 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 requirements and secure reliable parts for your FZ35-35J series BOPs.
Conclusion
The FZ35-35J and 2FZ35-35J Ram BOPs are critical medium-pressure well control devices for oil and gas drilling, offering versatile performance through dual ram assembly compatibility, robust sealing systems, and user-friendly maintenance design. This guide integrates authoritative technical insights, field-proven repair cases, and procurement best practices to support technicians and procurement professionals in maintaining operational continuity and safety.
By following model-specific maintenance schedules, using genuine compatible parts, and leveraging the FAQs and repair cases herein, you can maximize the service life of your FZ35-35J series BOPs and minimize downtime. Partnering with a trusted supplier for authentic parts ensures compliance with API and GB standards, safeguarding personnel, assets, and wellbore integrity in medium-pressure drilling environments. Invest in quality parts and proactive maintenance to keep your FZ35-35J series BOPs operating at peak performance.
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