Introduction
This guide is exclusively tailored for Shanghai Shenkai Ram BOP models, including FZ28-105, FZ35-105, 2FZ28-105, 2FZ35-105, and the optimized RAM35105S series ram assemblies. It serves as a dual-purpose reference for drilling contractors, on-site maintenance technicians, and procurement professionals engaged in high-pressure oil and gas operations. The core objective is to provide precise parts compatibility guidance, practical troubleshooting solutions, and standardized procurement criteria—aligning with API Spec 16A (Wellhead and Christmas Tree Equipment) and GB standards—to ensure operational safety, minimize downtime, and optimize parts inventory management. Whether for routine maintenance, emergency repairs, or parts replacement, this guide integrates technical insights and field-proven experience to support the reliable operation of Shenkai’s high-pressure Ram BOPs, which are critical for wellbore integrity control in demanding drilling scenarios.
Product Overview
Shanghai Shenkai’s FZ28-105, FZ35-105, and their dual-ram counterparts (2FZ28-105, 2FZ35-105) are high-performance well control devices designed for 105 MPa (15,225 psi) working pressure, catering to medium-deep onshore and offshore drilling projects. Complemented by the optimized RAM35105S series ram assemblies and legacy 2FZ35105A.02/FZ28105DA.02 ram assemblies, this product line offers extensive compatibility with pipe sizes ranging from 2 3/8” to 10 3/4”, including blind ram configurations for full wellbore closure. Key components include shear ram assemblies (SBR28105SA.00/SBR35105SA.00), variable diameter ram assemblies (VBR35105SA/SB/SC.00), and model-specific sealing systems—all engineered for interchangeability and durability under high-pressure, corrosive drilling conditions. The dual-ram models (2FZ series) provide enhanced redundancy with independent ram actuation, making them ideal for high-risk wells with unstable formation pressure, while the single-ram FZ series offers cost-effective reliability for standard operations.
Functional Description
Shanghai Shenkai’s Ram BOPs deliver comprehensive well control functions through coordinated operation of specialized components, with model-specific optimizations for 105 MPa pressure ratings:
Multi-Type Ram Sealing: Optimized RAM35105S series ram assemblies (covering 2 3/8” to 10 3/4” pipes and blind rams) feature unified top seals (RAM35105SA.03.00) for simplified inventory, while legacy 2FZ35105A.02 and FZ28105DA.02 assemblies maintain compatibility with older Shenkai BOP models. Shear ram assemblies (SBR series) enable emergency pipe cutting and wellbore sealing, while variable diameter rams (VBR35105 series) adapt to 2 3/8”-7” pipe size ranges without full ram replacement.
High-Pressure Sealing Systems: Model-specific side door seals (float seal skeletons, rectangular rings, and O-rings) form robust barriers against wellbore fluid leakage—FZ28-105 uses GB1235 460×5.7 O-rings, while FZ35-105 integrates front/back rectangular rings (2FZ35105A.03-14/2S106A01.12.04) for enhanced pressure resistance. Ram shaft seals (SKZF133.01/SKZF135.01 Y-rings) prevent hydraulic fluid leakage under cyclic loading.
Hydraulic Actuation & Locking: Piston assemblies, hydraulic cylinders, and locking shaft seal systems (lip rings, wiper rings) ensure precise ram movement and secure locking under pressure. The secondary seal system (SFZ1310 series components) allows on-site grease injection (EM-09-1) without disassembling the BOP, reducing maintenance downtime.
Modular Hinge Structures: Hinge assemblies (with model-specific pins, brackets, and bearings) enable safe, easy access to internal components for maintenance, with corrosion-resistant materials to withstand harsh drilling environments.
Structural Features
Shanghai Shenkai’s Ram BOPs feature a pressure-optimized, modular design tailored for 105 MPa operations, with key characteristics enhancing reliability and maintainability:
Optimized vs. Legacy Ram Compatibility: The RAM35105S series (optimized) simplifies parts management with unified top seals and standardized part numbering, while maintaining backward compatibility with FZ35-105 models. Legacy 2FZ35105A.02 and FZ28105DA.02 assemblies are fully interchangeable with older Shenkai BOPs, supporting fleet consistency.
Model-Specific Sealing Design: FZ28-105 and FZ35-105 feature distinct side door seal structures—FZ28-105 uses O-rings and float seal skeletons (FZ2870X-08-12), while FZ35-105 adds rectangular rings for superior high-pressure sealing. Ram shaft seals are tailored to each model (SKZF133 for FZ28-105, SKZF135 for FZ35-105) to match shaft dimensions and pressure demands.
Standardized Hydraulic & Mechanical Components: Piston U-rings (SFZ1310-13), wear rings (SFZ1310-12), and cylinder bolts follow GB standards, ensuring compatibility with common drilling rig hydraulic systems and simplifying replacement.
Durable Hinge & Locking Systems: Hinge pins, brackets, and bearings (GB290-64/GB301-64) provide robust structural support, while locking shaft seal assemblies (lip rings, wiper rings) prevent accidental ram movement under pressure, enhancing operational safety.
Easy Maintenance Access: Components like wiper rings, O-rings, and shear blades are designed for quick replacement, with clear part number labeling and model-specific parts lists to minimize on-site maintenance time and skill requirements.
Applicable Operating Conditions
Shanghai Shenkai’s FZ28-105/FZ35-105 and 2FZ series Ram BOPs are optimized for 105 MPa high-pressure drilling scenarios, with specific applicability including:
Pressure & Temperature Range: Rated for 105 MPa working pressure and ambient temperatures of -20°C to 120°C (-4°F to 248°F), compatible with oil-based mud (OBM), water-based mud (WBM), and synthetic-based mud (SBM).
Pipe Size Compatibility: Accommodates pipe sizes from 2 3/8” to 10 3/4” via standard ram assemblies, with variable diameter rams (2 3/8”-7”) enabling seamless switching between sizes—ideal for wells with multiple casing programs.
Well Types: Suitable for medium-deep onshore oil and gas wells, shallow offshore wells (platform/jack-up rigs), and high-pressure well completion stages. Shear ram configurations make them critical for wells with blowout risk due to abnormal formation pressure.
Environmental Resistance: Seals and metal components are corrosion-resistant, withstanding exposure to drilling fluids, saltwater (offshore), and harsh atmospheric conditions, ensuring reliable performance in diverse operational environments.
Maintenance & Care Recommendations
Proactive maintenance is essential to maximize the service life and reliability of Shanghai Shenkai’s 105 MPa Ram BOPs. Below are model-specific best practices aligned with API Spec 16A and GB standards:
Regular Inspection Schedules: Conduct weekly visual inspections 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 components per the one-year spare parts list.
Seal Maintenance: For FZ28-105, replace GB1235 460×5.7 O-rings and float seal skeletons (FZ2870X-08-12) every 6 months. For FZ35-105, inspect rectangular rings (2FZ35105A.03-14/2S106A01.12.04) quarterly and replace if cracked or deformed. Apply secondary sealing grease (EM-09-1) every 3 months to the secondary seal system.
Ram Assembly Care: Clean ram bodies, shear blades, and seals after each use to remove drilling fluid residue. Store spare ram assemblies (RAM35105S, 2FZ35105A.02, FZ28105DA.02) in a dry, dust-free environment to prevent rubber degradation. Verify part number compatibility (e.g., RAM35105SA.00 for 2 3/8” pipes) before installation.
Hydraulic & Piston Maintenance: Inspect piston U-rings (SFZ1310-13) and wear rings (SFZ1310-12) monthly for damage. Replace hydraulic cylinder O-rings (100×5.3 for FZ28-105, 106×5.3 for FZ35-105) if leaks are detected, and torque cylinder bolts to specification after disassembly.
Hinge & Locking System: Lubricate hinge pins and bearings monthly with anti-corrosion lubricant. Check locking shaft lip rings (2FZ1870DBYS.03.22-00) and wiper rings (SFZ1310-23) quarterly—replace if worn to prevent structural loosening under pressure.
RAM35105S( ).00_ New ram assembly（after optimization）
Size | Ram assembly | Ram body | Front seal | Top seal |
2 3/8" | RAM35105SA.00 | RAM35105SA.01.00 | RAM35105SA.02.00 | RAM35105SA.03.00 |
2 7/8" | RAM35105SB.00 | RAM35105SB.01.00 | RAM35105SB.02.00 | RAM35105SA.03.00 |
3 1/2" | RAM35105SC.00 | RAM35105SC.01.00 | RAM35105SC.02.00 | RAM35105SA.03.00 |
3 1/8" | RAM35105ST.00 | RAM35105ST.01.00 | RAM35105ST.02.00 | RAM35105SA.03.00 |
4" | RAM35105SL.00 | RAM35105SL.01.00 | RAM35105SL.02.00 | RAM35105SA.03.00 |
4 1/2" | RAM35105SD.00 | RAM35105SD.01.00 | RAM35105SD.02.00 | RAM35105SA.03.00 |
4 3/4" | RAM35105SM.00 | RAM35105SM.01.00 | RAM35105SM.02.00 | RAM35105SA.03.00 |
5" | RAM35105SE.00 | RAM35105SE.01.00 | RAM35105SE.02.00 | RAM35105SA.03.00 |
5 1/2" | RAM35105SF.00 | RAM35105SF.01.00 | RAM35105SF.02.00 | RAM35105SA.03.00 |
5 3/4" | RAM35105SP.00 | RAM35105SP.01.00 | RAM35105SP.02.00 | RAM35105SA.03.00 |
6" | RAM35105SQ.00 | RAM35105SQ.01.00 | RAM35105SQ.02.00 | RAM35105SA.03.00 |
6 5/8" | RAM35105SR.00 | RAM35105SR.01.00 | RAM35105SR.02.00 | RAM35105SA.03.00 |
7" | RAM35105SG.00 | RAM35105SG.01.00 | RAM35105SG.02.00 | RAM35105SA.03.00 |
7 5/8" | RAM35105SJ.00 | RAM35105SJ.01.00 | RAM35105SJ.02.00 | RAM35105SA.03.00 |
8 5/8" | RAM35105SS.00 | RAM35105SS.01.00 | RAM35105SS.02.00 | RAM35105SA.03.00 |
9 5/8" | RAM35105SH.00 | RAM35105SH.01.00 | RAM35105SH.02.00 | RAM35105SA.03.00 |
10 3/4" | RAM35105SK.00 | RAM35105SK.01.00 | RAM35105SK.02.00 | RAM35105SA.03.00 |
Blind | RAM35105SI.00 | RAM35105SI.01.00 | RAM35105SI.02.00 | RAM35105SA.03.00 |
2FZ35105A.02( )-00 _ Original ram assembly Parts No.
Size | Ram assembly | Ram body | Front seal | Top seal |
2 3/8” | 2FZ35105A.02A-00 | 2FZ35105A.02A.02-00 | 2FZ35105A.02A.01-00 | 2FZ35105A.02A.03-00 |
2 7/8” | 2FZ35105A.02B-00 | 2FZ35105A.02B.02-00 | 2FZ35105A.02B.01-00 | 2FZ35105A.02A.03-00 |
3 1/2” | 2FZ35105A.02C-00 | 2FZ35105A.02C.02-00 | 2FZ35105A.02C.01-00 | 2FZ35105A.02A.03-00 |
4” | 2FZ35105A.02L-00 | 2FZ35105A.02L.02-00 | 2FZ35105A.02L.01-00 | 2FZ35105A.02A.03-00 |
4 1/2” | 2FZ35105A.02D-00 | 2FZ35105A.02D.02-01 | 2FZ35105A.02D.01-00 | 2FZ35105A.02A.03-00 |
5″ | 2FZ35105A.02E-00 | 2FZ35105A.02E.02-00 | 2FZ35105A.02E.01-00 | 2FZ35105A.02A.03-00 |
5 1/2″ | 2FZ35105A.02F-00 | 2FZ35105A.02F.02-00 | 2FZ35105A.02F.01-00 | 2FZ35105A.02A.03-00 |
6” | 2FZ35105A.02Q-00 | 2FZ35105A.02Q.02-00 | 2FZ35105A.02Q.01-00 | 2FZ35105A.02A.03-00 |
6 5/8” | 2FZ35105A.02R.00 | 2FZ35105A.02R.02.00 | 2FZ35105A.02R.01.00 | 2FZ35105A.02A.03-00 |
7″ | 2FZ35105A.02G-00 | 2FZ35105A.02G.02-00 | 2FZ35105A.02G.01-00 | 2FZ35105A.02A.03-00 |
7 5/8” | 2FZ35105A.02J-00 | 2FZ35105A.02J.02-00 | 2FZ35105A.02J.01-00 | 2FZ35105A.02A.03-00 |
9 5/8” | 2FZ35105A.02H-00 | 2FZ35105A.02H-02 | 2FZ35105A.02H.01-00 | 2FZ35105A.02A.03-00 |
10 3/4″ | 2FZ35105A.02K-00 | 2FZ35105A.02K-02 | 2FZ35105A.02K.01-00 | 2FZ35105A.02A.03-00 |
Blind | 2FZ35105A.02I-00 | 2FZ35105A.02I-02 | 2FZ35105A.02I.01-00 | 2FZ35105A.02A.03-00 |
2FZ28105DA.02( )-00_ Ram assembly Part No
Size | Pipe Ram Assembly Name（Qty） | |||||
Ram Assembly （2） | Top Seal （2） | Front Seal （2） | Ram block （2） | Holder （2） | Retracting screw （4） | |
2 3/8" | FZ28105DA.02A-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02A.01-00 | FZ28105DA. 02A-02 | FZ2870G-02-1 | 2FZ2870.02A-04 |
2 7/8" | FZ28105DA.02B-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02B.01-00 | FZ28105DA. 02B-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
3 1/2" | FZ28105DA.02C-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02C.01-00 | FZ28105DA. 02C-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
4 1/2" | FZ28105DA.02D-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02D.01-00 | FZ28105DA. 02D-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
5" | FZ28105DA.02E-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02E.01-00 | FZ28105DA. 02E-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
Blind | FZ28105DA.02F-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02F.01-00 | FZ28105DA .02F-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
5 1/2" | FZ28105DA.02G-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02G.01-00 | FZ28105DA. 02G-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
7" | FZ28105DA.02H-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02H.01-00 | FZ28105DA. 02H-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
7 5/8" | FZ28105DA.02I-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02I.01-00 | FZ28105DA. 02I-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
4" | FZ28105DA.02J-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02J.01-00 | FZ28105DA .02J-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
5 3/4" | FZ28105DA.02K-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02K.01-00 | FZ28105DA. 02K-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
6 5/8" | FZ28105DA.02L-00 | FZ28105DA. 02A.03-00 | FZ28105DA. 02L.01-00 | FZ28105DA. 02L-02-00 | FZ2870G-02-1 | 2FZ2870.02A-04 |
Parts list of shear ram assembly
Description | SBR28105SA.00 P/N | SBR35105SA.00 P/N | Quantity |
Upper shear ram body | SBR28105SA.02 | SBR35105SA.02 | 1 |
Front Seal | SBR28105SA.03.00 | SBR35105SA.03.00 | 1 |
Left Seal | SBR28105SA.06.00 | SBR35105SA.06.00 | 1 |
Top Seal | SBR28105SA.04.00 | SBR35105SA.04.00 | 2 |
Right Seal | SBR28105SA.05.00 | SBR35105SA.05.00 | 1 |
Lower shear ram body | SBR28105SA.01 | SBR35105SA.01 | 1 |
Parts list of variable diameter ram assembly of FZ35-105
Description | P/N | ||
5" - 7" VBR35105SA.00 | 3 1/2" - 5" VBR35105SB.00 | 2 3/8-3 1/2 VBR35105SC.00 | |
Front Seal | VBR35105SA.02.00 | VBR35105SB.02.00 | VBR35105SC.02.00 |
Top Seal | VBR35105SA.03.00 | VBR35105SA.03.00 | VBR35105SA.03.00 |
Ram body | VBR35105SA.01.00 | VBR35105SB.01.00 | VBR35105SC.01.00 |
Screw | GB/T70.1 M12×85 | GB/T70.1 M12×112 | GB/T70.1 M12×130 |
Part list of Side Door Seal Structure of FZ28-105
Description | Part No. /Model |
O-ring | FZ28105DA.04-09 |
O-ring | GB1235 460×5.7 |
Skeleton of float seal | FZ2870X-08-12 |
Part list of Side Door Seal Structure of FZ35-105
Description | Part No. /Model |
Front rectangular ring | 2FZ35105A.03-14 |
O-ring | 2S106A01.12.03 |
Skeleton of float seal | 2S106A01.12.01 |
Back rectangular ring | 2S106A01.12.04 |
Part list of Ram Shaft Seal Assembly of FZ28-105
Description | P/N |
Retainer ring | FZ28105DA.04-10 |
Wiper ring | 2FZ35105A.03-11 |
Wiper ring holder | FZ2870X-08-16A |
Y-ring | SKZF133.01 |
Backup ring | SKZF133.03 |
Packing Bearing Ring | FZ2870X-08-20 |
Backup ring | FZ2870X-08-22 |
Washer | FZ28105DA.04-06 |
Part list of Ram Shaft Seal Assembly of FZ35-105
Description | P/N |
Retainer ring | SFZ1310-48A |
Wiper ring | 2FZ35105A.03-11 |
Wiper ring holder | 2FZ35105A.03-12 |
Y-ring | 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 of FZ28-105/FZ35-105
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 of FZ28-105/FZ35-105
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 | FZ28-105 Part No./Model | FZ35-105 Part No./Model |
Hinge Pin | FZ3570A-01-1 | 2FZ2870.01-01 |
O Ring | 73×3.55 | 63×3.55 |
O Ring | 56×3.55 | 48.7×3.55 |
Hinge Bracket | FZ3570A-01-3 | 2FZ35105A.06-02 |
Upper Hinge | FZ28105DA.01.02-00 | 2FZ35105A.06.01-00 |
O Ring | 33.5×3.55 | 33.5×3.55 |
Hydraulic Connection | FZ3570A-01-5 | 2FZ35105A.06-03 |
Spring | FZ3570A-01-6 | 2FZ2870.01-06 |
Left Hinge Bracket | FZ3570A-01-7-00 | 2FZ35105A.06.04-00 |
Right Hinge Bracket | FZ3570A-04-1-00 | 2FZ35105A.12.01-00 |
Lower Hinge | FZ28105DA.01.01-00 | 2FZ35105A.06.05-00 |
O Ring | 20×2.65 | 20×2.65 |
Pin | GB120 B16×55 | GB120 B16×60 |
Screw | GB70 M20×50 | GB70 M24×70 |
Screw | GB70 M20×60 | GB70 M24×70 |
O Ring | 25×3.55 | 36.5×3.55 |
Screw | GB70 M16×45 | GB70 M16×60 |
O Ring | 25×3.55 | 25×3.55 |
Washer, Adjust | FZ3570A-01-4 | 2FZ2870.01-04 |
Needle Bearing | GB290-64 941/35 | GB290-64 941/30 |
Bearing | GB301-64 8108 | GB301-64 8107 |
Description | FZ28-105 Part No./Model | FZ35-105 Part No./Model |
Body | -- | -- |
Locating Pin | FZ3570A-00-7 | SFZ1310-50 |
Ram Assembly | -- | -- |
Door bolt | FZ28105DA-11 | 2FZ35105A-08 |
NPT 1 Plug | 2C01.21 | 2C01.21 |
Screw | GB5782 M12×40 | GB5782 M12×40 |
Nozzle flange | 2FZ2870-12 | 2FZ2870-12 |
O-ring | 43.7×3.55 | 43.7×3.55 |
Hinge Assembly | See 3.2.9 | -- |
Ram shaft | FZ28105DA.04-05 | 2FZ35105A.03-04 |
Ram Shaft Seal Assembly | See 3.2.5 | -- |
Side Door Seal Structure | See 3.2.4 | -- |
Left Door | FZ28105DA.13-02 | 2FZ35105A.07-01 |
Right Door | FZ28105DA.04-04 | 2FZ35105A.03-02 |
Secondary Seal System | See 3.2.6 | - |
Piston | FZ28105DA.04-07 | 2FZ35105A.03-05 |
Locking nut | FZ2870X-08-07 | SFZ1310-15 |
Screw | FZ2870X-08-23 | GB71 M10×25 |
Hydraulic cylinder | FZ28105DA.04-03 | 2FZ35105A.03-03 |
Locking screw | FZ2870DB-01-01 | 2FZ35105A.03-08 |
Cylinder Bolt | FZ28105DA.04-02 | 2FZ35105A.03-06 |
Cap Nut | SFZ1310-35 | SFZ1310-35 |
O-ring | SFZ1310-24 | SFZ1310-24 |
O-ring | 100×5.3 | 106×5.3 |
Wear ring | SFZ1310-12 | SFZ1310-12 |
U-ring | SFZ1310-13 | SFZ1310-13 |
O-ring | SFZ1310-14 | SFZ1310-14 |
O-ring | 26.5×2.65 | 31.5×3.55 |
Cylinder Manifold | FZ28105DA.04-08 | 2FZ35105A.03-09 |
Locking Shaft Seal Assembly | See 3.2.7 | -- |
Plug NPT 3/4" | SFZ1310-01 | SFZ1310-01 |
Right Cylinder head | FZ28105DA.04-01 | 2FZ35105A.03-07 |
Left Cylinder head | FZ28105DA.13-01 | 2FZ35105A.07-02 |
Description | FZ28-105 Part No./Model | FZ35-105 Part No./Model |
O-ring | 43.7×3.55 | 43.7×3.55 |
O-ring | 73×3.55 | 63×3.55 |
O-ring | 56×3.55 | 48.7×3.55 |
O-ring | 33.5×3.55 | 33.5×3.55 |
O-ring | 20×2.65 | 20×2.65 |
O-ring | 25×3.55 | 36.5×3.55 |
O-ring | 25×3.55 | 25×3.55 |
Wiper ring | 2FZ35105A.03-11 | 2FZ35105A.03-11 |
Y-ring | SKZF133.01 | SKZF135.01 |
Backup ring | SKZF133.03 | SKZF135.02 |
O-ring | N/A | 150×3.55 |
O-ring | N/A | 136×3.55 |
O-ring (Front rectangular ring) | FZ28105DA.04-09 | 2FZ35105A.03-14 |
O-ring | GB1235 460×5.7 | 2S106A01.12.03 |
Back rectangular ring | N/A | 2S106A01.12.04 |
Secondary sealing grease | EM-09-1 | EM-09-1 |
O-ring | SFZ1310-24 | SFZ1310-24 |
O-ring | 100×5.3 | 106×5.3 |
Wearing ring | SFZ1310-12 | SFZ1310-12 |
U-ring | SFZ1310-13 | SFZ1310-13 |
O-ring | SFZ1310-14 | SFZ1310-14 |
O-ring | 26.5×2.65 | 31.5×3.55 |
Lip ring cover | 2FZ1870DBYS.03-23 | 2FZ1870DBYS.03-23 |
Lip ring | 2FZ1870DBYS.03.22-00 | 2FZ1870DBYS.03.22-00 |
Wiper Ring | SFZ1310-23 | SFZ1310-23 |
Field Fault Repair Cases
The following real-world cases provide practical troubleshooting insights for common faults in Shanghai Shenkai Ram BOPs, helping technicians resolve issues quickly and minimize downtime:
Case 1: FZ35-105 Side Door Seal Leakage
Symptom: Wellbore fluid leakage at the side door during 105 MPa pressure testing. Root Cause: Front rectangular rings (2FZ35105A.03-14) were cracked, and O-rings (2S106A01.12.03) were worn due to prolonged exposure to oil-based mud. Repair: Replaced rectangular rings and O-rings, cleaned the seal groove to remove residue, and reinstalled the float seal skeleton (2S106A01.12.01). A 105 MPa pressure test confirmed no leakage. Preventive Measure: Inspect side door seals bi-weekly in OBM environments.
Case 2: 2FZ28-105 Ram Shaft Hydraulic Leakage
Symptom: Hydraulic fluid leakage at the ram shaft seal assembly. Root Cause: SKZF133.01 Y-rings were worn, and backup rings (SKZF133.03) were deformed, compromising sealing integrity. Repair: Replaced Y-rings and backup rings, cleaned the ram shaft to remove burrs, and inspected the wiper ring holder (FZ2870X-08-16A) for damage. Post-repair testing showed smooth actuation with no leakage. Preventive Measure: Replace ram shaft seal components every 6 months or 80 operational cycles.
Case 3: FZ35-105 Shear Ram Failure to Cut Pipe
Symptom: SBR35105SA.00 shear ram failed to cut drill pipe during emergency testing. Root Cause: Misalignment between upper/lower shear ram bodies (SBR35105SA.02/01) due to loose retaining components, and worn top seals (SBR35105SA.04.00). Repair: Realigned the shear ram bodies, replaced top seals, and tightened all connecting components. Emergency testing confirmed successful pipe cutting and sealing. Preventive Measure: Inspect shear ram alignment quarterly and replace top seals every 12 months.
Case 4: 2FZ35-105 Variable Diameter Ram Jamming
Symptom: VBR35105SB.00 variable diameter ram (3 1/2”-5”) jammed during size adjustment. Root Cause: Drilling fluid residue buildup in the ram body (VBR35105SB.01.00) and worn screws (GB/T70.1 M12×112). Repair: Disassembled the ram assembly, cleaned the ram body to remove residue, replaced worn screws, and lubricated moving parts. Post-repair adjustment was smooth across the entire pipe size range. Preventive Measure: Clean variable diameter rams after each size adjustment and inspect screws monthly.
FAQ (Frequently Asked Questions)
Question | Answer |
Can the optimized RAM35105S series ram assemblies replace legacy 2FZ35105A.02 assemblies on FZ35-105 BOPs? | Yes, the RAM35105S series is designed as a direct replacement for 2FZ35105A.02 assemblies on FZ35-105 models. It offers improved sealing performance and unified top seals (RAM35105SA.03.00) for simplified inventory. Ensure the pipe size matches the RAM35105S variant (e.g., RAM35105SB.00 for 2 7/8” pipes) to maintain compatibility. |
What is the key difference between FZ28-105 and FZ35-105 side door seal structures? | FZ28-105 uses O-rings (GB1235 460×5.7) and float seal skeletons (FZ2870X-08-12), while FZ35-105 integrates front/back rectangular rings (2FZ35105A.03-14/2S106A01.12.04) plus O-rings for enhanced high-pressure sealing. Parts are not interchangeable—always use model-specific seal components to avoid leakage. |
How to resolve secondary seal system grease injection failure? | Common causes include clogged cocks (SFZ1310-30) or contaminated check valves (SFZ1310.32-00). Disassemble and clean the cock, check valve, and injection channel, replace old grease with EM-09-1, and ensure no debris blocks the flow. Quarterly cleaning of the secondary seal system prevents this issue. |
Are shear ram assemblies (SBR28105SA.00/SBR35105SA.00) interchangeable between FZ28-105 and FZ35-105? | No, they are model-specific. SBR28105SA.00 is designed for FZ28-105, while SBR35105SA.00 is for FZ35-105. Differences in shear ram body dimensions and pressure ratings (both 105 MPa, but structural fit varies) prevent interchangeability. Using the wrong assembly will cause misalignment and failure. |
Which spare parts should be prioritized for one-year inventory for a mixed fleet of FZ28-105 and FZ35-105? | Focus on shared high-wear components: EM-09-1 secondary grease, SFZ1310-13 U-rings, SFZ1310-12 wear rings, 2FZ1870DBYS.03.22-00 lip rings, and SFZ1310-23 wiper rings. Add model-specific seals: GB1235 460×5.7 O-rings (FZ28-105) and 2FZ35105A.03-14 rectangular rings (FZ35-105). Stock 2-4 sets of each to cover emergency repairs. |
Procurement Guidance
The safety and reliability of Shanghai Shenkai Ram BOPs (FZ28-105, FZ35-105, 2FZ series) depend entirely on genuine, compatible parts. We supply a full range of authentic components, including optimized RAM35105S series ram assemblies, legacy 2FZ35105A.02/FZ28105DA.02 assemblies, shear rams, seals, piston components, and hinge structures—all manufactured to API Spec 16A and GB standards, with traceable material certificates and batch records.
Our parts ensure perfect fit and 105 MPa pressure resistance, matching Shanghai Shenkai’s original equipment specifications. For mixed fleets, we offer tailored inventory solutions to balance cost and availability, prioritizing high-wear components for quick access during maintenance or emergencies. Our team of well control experts provides technical support for parts selection, ensuring compatibility with your specific BOP models and operational needs. Whether you require routine spares, emergency repair components, or bulk orders for fleet maintenance, we deliver consistent quality without compromising on safety standards. Contact us today to discuss your requirements and secure reliable parts for your Shanghai Shenkai Ram BOPs.
Conclusion
Shanghai Shenkai’s FZ28-105, FZ35-105, and 2FZ series Ram BOPs are critical for high-pressure oil and gas drilling, delivering robust well control through modular design, optimized sealing, and reliable actuation. This guide provides comprehensive technical insights, field-proven troubleshooting, and procurement best practices to support technicians and procurement professionals in maintaining operational continuity and safety.
By adhering to model-specific maintenance schedules, using genuine compatible parts, and leveraging the practical cases and FAQs herein, you can maximize the service life of your Shenkai Ram 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 the most demanding drilling environments. Invest in quality parts and proactive maintenance to keep your Shanghai Shenkai Ram BOPs operating at peak performance.
contact us ：
Emeil: [email protected] whatsapp: +86 15275658619
Should you have any purchase intentions, please contact us – we will offer you our most favorable price.