Core Purpose & Equipment Adaptation
This guide is tailored for FH28-70/105 (P/N: FH2870-00), FH35-70/105 (P/N: FH3570-00), and FH43-35 (P/N: H24.00) wedge connection annular blowout preventers (BOPs). It addresses drilling contractors, maintenance technicians, and procurement teams’ needs, ensuring API 16A-compliant operation, mitigating thermal/high-pressure wear downtime, and sustaining sealing integrity in harsh oil and gas drilling environments.
Product Overview
These wedge connection annular BOPs are engineered for high-reliability well control, with FH28-70/105 and FH35-70/105 handling up to 70/105MPa pressure, and FH43-35 rated at 35MPa. The wedge block design ensures secure component fastening, while replaceable sealing elements adapt to diverse drilling conditions, making them ideal for onshore/offshore deep wells and high-pressure gas wells.
Key Structural & Functional Features
Adopting a modular wedge connection structure, the BOPs integrate a robust housing, precision piston, and high-performance sealing rubber core for uniform annular sealing. Wedge blocks and hold-down rings enhance structural stability under extreme pressure. Sealing systems (O-rings, combination rings) resist drilling fluid erosion, while wear rings extend piston and housing service life, aligning with T-75 temperature grade standards.
Applicable Working Conditions
Suitable for high-pressure oil/gas wells, deep carbonate reservoirs, and onshore/offshore drilling operations. FH28-70/105 and FH35-70/105 excel in 70-105MPa high-pressure scenarios, while FH43-35 fits 35MPa standard operations. Compatible with drilling fluids and steam-assisted processes, enduring temperature fluctuations per T-75 grade requirements.
Maintenance & Care Recommendations
Inspect wedge blocks and seals bi-weekly for wear or deformation. Replace sealing rubber cores (e.g., FH2870-05) every 6 months or if cracking occurs. Lubricate threads of studs/nuts with high-temperature grease to prevent galling. Conduct annual hydrostatic tests per API 16A § 10.3. Store spare parts in dry, low-humidity environments to avoid elastomer aging.
Field Fault Repair Cases
Case 1: Sealing Rubber Core Failure (FH35-70/105)
Symptom: Annular leakage during pressure testing. Root Cause: Sealing rubber core (FH3570-07) degraded by drilling fluid additives and high temperature. Repair: Replaced with genuine core, cleaned sealing surfaces, and tested at 105MPa. Preventive Measure: Filter drilling fluid; inspect core monthly.
Case 2: Wedge Block Loosening (FH43-35)
Symptom: Abnormal vibration and pressure fluctuation. Root Cause: Wedge blocks (H24.03) loosened due to insufficient torque and thread wear. Repair: Retorqued studs (FH2870-02) to 450N·m, replaced worn blocks. Preventive Measure: Torque check every 50 operating cycles; use anti-seize compound on threads.
Main Body & Structural Components
These components form the BOP’s load-bearing framework, ensuring structural integrity under high pressure. Wedge blocks and hold-down rings secure the assembly, while the housing and top cover resist deformation, critical for reliable well control.
No. | Description | FH28-70/105 P/N | FH35-70/105 P/N | FH43-35 P/N | Material | Main Wear Causes | Usage Precautions |
1 | Removal of screw | FH3570-19 | FH3570-19 | N/A | Alloy Steel (ASTM A193 B7) | Thread wear; torque overload; corrosion | Use matching tools; avoid over-tightening; apply anti-seize compound |
2 | Hold-down ring | FH2870-01 | FH3570-01 | H24.01 | Carbon Steel (SAE 1045) | Pressure fatigue; surface corrosion; misalignment | Check alignment during assembly; inspect for deformation monthly |
3 | Wedge block | FH2870-03 | FH3570-05 | H24.03 | Alloy Steel (ASTM A387 Gr. 11) | Friction wear; torque loosening; impact damage | Retorque associated fasteners regularly; avoid direct mechanical impact |
4 | Top cover | FH2870-04 | FH3570-06 | H24.04 | Alloy Steel (ASTM A182 F22) | Thermal stress; pressure deformation; seal groove wear | Preheat uniformly before high-temperature operation; inspect seal grooves for burrs |
5 | Housing | FH2870-15 | FH3570-18 | H24.15 | Alloy Steel (ASTM A387 Gr. 22) | Internal pressure fatigue; drilling fluid corrosion; thermal cracking | Conduct ultrasonic flaw detection semi-annually; avoid chemical exposure |
6 | Lifting eye | FH3570-04 | FH3570-04 | FH3570-04 | Carbon Steel (SAE 1035) | Load fatigue; thread wear; corrosion | Do not exceed rated lifting capacity; inspect threads before use |
Sealing System Components
These parts ensure annular and component sealing, preventing drilling fluid leakage. High-temperature-resistant elastomers and combination rings adapt to harsh conditions, with precise sizing matching each BOP model for optimal performance.
No. | Description | FH28-70/105 P/N | FH35-70/105 P/N | FH43-35 P/N | Material | Main Wear Causes | Usage Precautions |
7 | Sealing rubber core | FH2870-05 | FH3570-07 | H24.06.00 | High-Temp Nitrile Rubber (NBR 70) | Thermal aging; chemical erosion; compression set | Replace every 6 months; avoid contact with incompatible chemicals |
8 | O-ring Mud ring,O.D. | FH2870-06 | FH3570-08 | H24.07 | Viton Fluororubber | Sharp edge cutting; thermal hardening; fluid immersion | Inspect sealing groove for burrs; store in sealed packaging |
9 | Mud ring | FH2870-08 | FH3570-10 | H24.08 | Reinforced Rubber | Sludge abrasion; pressure fatigue; deformation | Clean after each use; replace if surface is uneven |
10 | Sealing ring, Housing Upper | FH2870-10-0 | FH3570-12-0 | H24.11 | Nitrile Rubber (NBR 60) | Thermal cycling fatigue; pressure leakage | Check for swelling monthly; replace if elasticity is lost |
11 | Sealing ring, Housing ,Lower | H24.12.00 | H24.12.00 | H24.12.00 | Nitrile Rubber (NBR 60) | Corrosion; compression damage; misalignment | Ensure proper housing alignment during assembly |
12 | Combination sealing ring, Mud ring,I.D. | FH2870-07 | FH3570-09 | H24.05.00 | Rubber-Metal Composite | Layer separation; fluid erosion; thermal stress | Avoid extreme temperature changes; inspect bonding monthly |
13 | Sealing ring, Mud ring Upper | FH2870-09-0 | FH3570-11-0 | H24.09 | Viton Fluororubber | Steam erosion; chemical attack; wear | Replace every 4 months in steam-assisted operations |
14 | Sealing ring, Mud ring ,Lower | H24.10.00 | H24.10.00 | H24.10.00 | Viton Fluororubber | Bottom sludge accumulation; pressure damage | Clean mud ring cavity regularly; inspect for clogs |
15 | Sealing ring, Piston O.D. | FH2870-11-0 | FH3570-14-0 | H24.16.00 | Urethane Rubber | Piston friction; pressure pulsation; thermal hardening | Lubricate piston surface before actuation; maintain hydraulic pressure stability |
Piston & Wear-Resistant Components
These components ensure smooth piston actuation and reduce wear, extending the BOP’s service life. Wear rings minimize metal-to-metal contact, while the piston transmits hydraulic force for reliable ram operation under high pressure.
No. | Description | FH28-70/105 P/N | FH35-70/105 P/N | FH43-35 P/N | Material | Main Wear Causes | Usage Precautions |
1 | Piston | FH2870-14 | FH3570-17 | H24.14 | Carbon Steel (SAE 1050) | Surface corrosion; seal friction; pressure fatigue | Polish surface to Ra ≤0.8μm; inspect for pitting monthly |
2 | Wearing ring ,Housing | FH2870-13 | FH3570-16 | H24.13 | Polyurethane (Shore A 90) | Lateral friction; thermal softening; impact | Monitor wear depth; replace when thickness decreases by ≥2mm |
3 | Wearing ring, Piston | FH2870-12 | FH3570-15 | H24.17 | Polyurethane (Shore A 90) | Reciprocation friction; sludge abrasion; deformation | Clean piston cavity every 50 actuation cycles; lubricate with compatible grease |
Fasteners & Connectors
These parts secure BOP components, with high-strength studs and nuts resisting torque and pressure-induced forces. Precision screws ensure proper alignment, critical for maintaining structural integrity and sealing performance.
No. | Description | FH28-70/105 P/N | FH35-70/105 P/N | FH43-35 P/N | Material | Main Wear Causes | Usage Precautions |
1 | Nut | FH3570-03A | FH3570-03A | FH3570-03A | Alloy Steel (ASTM A194 2H) | Thread galling; torque overload; corrosion | Use torque wrench to apply specified torque; apply anti-seize compound |
2 | Stud | FH2870-02 | FH3570-02 | FH2870-02 | Alloy Steel (ASTM A193 B7) | Tensile fatigue; thread wear; bending | Inspect thread integrity monthly; replace if deformation is detected |
3 | Screw | GB30-76 M24x30 | GB30-76 M24x30 | GB5783 M24x50 | Carbon Steel (SAE 1035) | Vibration loosening; thread corrosion; shear damage | Secure with lock washers; check tightness after high-vibration operations |
4 | Screw | GB70-76 M20×30 | GB70-76 M24×30 | GB70-76 M20×30 | Carbon Steel (SAE 1035) | Over-tightening; corrosion; impact | Do not exceed torque limits; use rust-resistant coating |
5 | Screw | GB70-76 M36×80 | GB70-76 M36×80 | GB70-76 M36×80 | Alloy Steel (ASTM A193 B7) | High torque fatigue; thread wear; bending | Apply torque in uniform sequence; inspect for bending after use |
6 | Joint | FH3570-13 | FH3570-13 | FH3570-13 | Alloy Steel (ASTM A182 F22) | Fluid erosion; thermal stress; connection loosening | Check for leakage pre-operation; retorque connections quarterly |
7 | Oil plug | F02-15 | F02-15 | 2C01.21 | Carbon Steel (SAE 1035) | Thread corrosion; over-tightening; fluid leakage | Seal threads with PTFE tape; use matching socket tools |
FAQ
Question | Answer |
Can sealing rings be cross-used between FH28-70/105 and FH35-70/105? | No. FH28-70/105 uses FH2870-series seals, while FH35-70/105 uses FH3570-series. Their sizes and pressure ratings differ, cross-use causes leakage and structural damage, violating API 16A safety norms. |
What torque should be applied to FH3570-03A nuts? | Apply 450-500N·m torque using a calibrated torque wrench. Use anti-seize compound on threads to prevent galling, and retorque after the first thermal cycle to ensure tightness. |
How to extend the service life of the sealing rubber core? | Avoid exposing the core to temperatures exceeding 120℃. Filter drilling fluid to remove solid particles. Inspect monthly for cracks or swelling, and replace every 6 months or after 100 pressure cycles, whichever comes first. |
Procurement Guidance
Genuine parts are critical for the safe operation of FH-series wedge connection annular BOPs. We supply all model-specific components—sealing systems, fasteners, piston parts—fully compliant with API 16A and T-75 temperature grade standards, with traceable material certificates. Our technical team provides personalized spare parts plans based on your drilling conditions. Contact us to secure authentic parts that minimize downtime and maintain well control integrity.
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