Core Purpose & Equipment Adaptation
This guide is tailored for FH18-35, FH23-35, and FH35-35 steam-heated annular blowout preventers (BOPs), essential for high-temperature oil and gas drilling. It addresses drilling contractors, maintenance technicians, and procurement teams’ needs for model-specific parts, mitigating downtime from thermal wear and ensuring API-compliant well control in harsh high-temperature downhole environments.
1. Main Parts of FH Series Steam Heated Annular BOPs
These core components form the structural and sealing foundation of FH18-35/FH23-35/FH35-35 BOPs, enduring cyclic steam heating and high pressure. They ensure annular sealing integrity, with model-specific designs optimizing performance for respective operating parameters.
No. | Description | FH18-35 Part No. (Qty.) | FH23-35 Part No. (Qty.) | FH35-35 Part No. (Qty.) | Material | Main Wear Causes | Usage Precautions |
1 | Bonnet | H22.03 (1) | H17.02 (1) | H18.02 (2) | Alloy Steel (ASTM A182 F22) | Thermal expansion mismatch; high-pressure fatigue; thread corrosion | Preheat uniformly to 60-80℃ before steam operation; retorque after each thermal cycle |
2 | Packer | FH1835.06-00 (1) | H14.06.00 (1) | FW1305.06-00A (1) | High-Temp Fluororubber Composite | Thermal aging; abrasive fluid erosion; over-compression during sealing | Avoid operating temp exceeding 130℃; filter drilling fluid to remove solid particles |
3 | Seal-Adapter Ring I.D., upper | H22.08.00 (1) | H17.09.00 (1) | H18.09.00 (1) | Viton Fluororubber | Steam-induced hardening; radial pressure deformation; edge abrasion | Store in low-humidity (≤60%) environment; install with plastic sleeve to protect edges |
4 | Wear ring-Adapter Ring | H22.13 (1) | H17.16 (1) | H18.16 (1) | Polyurethane (Shore A 90) | Adapter ring rotation friction; thermal softening; impact damage | Monitor wear depth monthly; replace when thickness decreases by ≥2mm |
5 | Seal-Adapter Ring I.D., lower | H22.08.00 (1) | H17.09.00 (1) | H18.09.00 (1) | Viton Fluororubber | Thermal cycling fatigue; chemical corrosion from drilling fluid additives | Test fluid compatibility quarterly; replace if surface cracks or swelling occur |
6 | Adapter Ring | H22.09 (1) | H17.03 (1) | H18.03 (1) | Carbon Steel (SAE 1045) | Oxidation under high-temperature steam; mechanical impact during installation | Apply high-temp anti-corrosion coating; use lifting tools to avoid direct collision |
7 | Seal-Piston O.D. | H22.17.00 (2) | H17.08.00 (2) | H18.08.00 (2) | Nitrile Rubber (NBR 70) | Piston reciprocation friction; thermal hardening; pressure pulsation damage | Lubricate with high-temp grease (API 16A § 5.3 compliant); avoid dry actuation |
8 | Seal-piston I.D., Upper | H22.14.00 (1) | H17.07.00 (1) | H18.07.00 (1) | Nitrile Rubber (NBR 70) | Internal pressure fatigue; thermal expansion mismatch with piston | Control piston actuation speed ≤0.1m/s; inspect seal contact surface pre-operation |
9 | Seal-piston I.D., Lower | H22.14.00 (1) | H17.07.00 (1) | H18.07.00 (1) | Nitrile Rubber (NBR 70) | Accumulated sludge abrasion; long-term compression set | Clean piston inner cavity regularly; release pressure completely after use |
10 | Shell | H22.01.00 (1) | H17.01.00 (1) | H18.01.00 (1) | Alloy Steel (ASTM A387 Gr. 11) | Thermal stress cracking; external mechanical impact; steam corrosion | Conduct ultrasonic flaw detection semi-annually; avoid knocking with heavy tools |
11 | Cap Nut | H22.05 (24) | H17.05 (24) | H18.05 (24) | Carbon Steel (SAE 1035) | Thermal loosening; thread galling; corrosion from steam condensate | Use anti-seize compound on threads; retorque to 350 N·m after each thermal cycle |
12 | Stud | H22.02 (24) | H17.06 (24) | H18.06 (24) | Alloy Steel (ASTM A193 B7) | Tensile fatigue; thread corrosion; over-tightening damage | Inspect thread integrity monthly; replace if thread deformation is detected |
13 | O-ring | H22.10 (1) | H17.11 (1) | H18.11 (1) | Viton Fluororubber | Thermal aging; compression set; sharp edge cutting | Replace every 6 months; ensure sealing groove is free of burrs |
14 | O-ring | H22.12 (1) | H17.10 (1) | H18.10 (1) | Viton Fluororubber | Steam leakage erosion; chemical attack from drilling fluid | Check for leakage pre-operation; isolate from incompatible chemicals during storage |
15 | Wear ring- Piston O.D. | H22.16 (2) | H17.14 (2) | H18.14 (2) | Polyurethane (Shore A 90) | Piston lateral movement friction; thermal degradation; impact | Maintain piston coaxiality; avoid exceeding 120℃ operating temperature |
16 | Piston | H22.11 (1) | H17.04 (1) | H18.04 (1) | Carbon Steel (SAE 1050) | Surface corrosion; wear from seal friction; pressure pulsation fatigue | Polish surface to Ra ≤0.8μm; lubricate seal contact area before actuation |
17 | Wear ring- Piston I.D. | H22.15 (1) | H17.15 (1) | H18.15 (1) | Polyurethane (Shore A 90) | Inner cavity friction; thermal softening; sludge accumulation abrasion | Clean piston inner cavity every 50 actuation cycles; replace if cracks appear |
18 | Adapter | N/A | H17.17 (2) | H17.17 (2) | Carbon Steel (SAE 1045) | Thermal fatigue; mechanical vibration; corrosion | Secure with lock washers; inspect for loosening after high-vibration operations |
19 | NPT1" Plug | 2C01.21 (2) | 2C01.21 (2) | 2C01.21 (2) | Carbon Steel (SAE 1035) | Thread corrosion; over-tightening damage; steam leakage erosion | Seal threads with PTFE tape; use torque wrench to avoid over-tightening |
20 | NPT 1/2" Hexagonal socket head plug | 2C01.36 (2) | 2C01.36 (2) | 2C01.36 (2) | Alloy Steel (ASTM A193 B7) | Thread wear; socket head damage; corrosion from condensate | Use matching socket tools; inspect thread condition during maintenance |
2. One-Year Spare Parts for FH Series Steam Heated Annular BOPs
These high-wear spares are selected for frequent failure under cyclic steam heating and pressure. Stocking them minimizes downtime, ensuring continuous well control for FH18-35/FH23-35/FH35-35 BOPs in high-temperature drilling scenarios.
No. | Description | FH18-35 Part No. (Qty.) | FH23-35 Part No. (Qty.) | FH35-35 Part No. (Qty.) | Material | Main Wear Causes | Usage Precautions |
1 | Seal-Adapter Ring I.D., upper | H22.08.00 (1) | H17.09.00 (1) | H18.09.00 (1) | Viton Fluororubber | Steam-induced hardening; radial pressure deformation | Store in sealed packaging; replace if surface loses elasticity |
2 | Wear ring-Adapter Ring | H22.13 (1) | H17.16 (1) | H18.16 (1) | Polyurethane (Shore A 90) | Rotation friction; thermal softening | Avoid storage in high-temperature (＞40℃) environments; monitor wear monthly |
3 | Seal-Adapter Ring I.D., lower | H22.08.00 (1) | H17.09.00 (1) | H18.09.00 (1) | Viton Fluororubber | Thermal cycling fatigue; chemical corrosion | Test fluid compatibility; replace if swollen or cracked |
4 | Seal-Piston O.D. | H22.17.00 (2) | H17.08.00 (2) | H18.08.00 (2) | Nitrile Rubber (NBR 70) | Reciprocation friction; thermal hardening | Lubricate with high-temp grease; avoid dry actuation |
5 | Seal-piston I.D., Upper | H22.14.00 (1) | H17.07.00 (1) | H18.07.00 (1) | Nitrile Rubber (NBR 70) | Pressure fatigue; expansion mismatch | Control actuation speed; inspect pre-operation |
6 | Seal-piston I.D., Lower | H22.14.00 (1) | H17.07.00 (1) | H18.07.00 (1) | Nitrile Rubber (NBR 70) | Sludge abrasion; compression set | Clean piston cavity; release pressure after use |
7 | O-ring | H22.10 (1) | H17.11 (1) | H18.11 (1) | Viton Fluororubber | Thermal aging; sharp edge cutting | Replace every 6 months; deburr sealing grooves |
8 | O-ring | H22.12 (1) | H17.10 (1) | H18.10 (1) | Viton Fluororubber | Steam erosion; chemical attack | Check for leakage pre-operation; store away from chemicals |
9 | Wear ring- Piston O.D. | H22.16 (2) | H17.14 (2) | H18.14 (2) | Polyurethane (Shore A 90) | Lateral movement friction; thermal degradation | Maintain piston coaxiality; limit operating temp ≤120℃ |
10 | Wear ring- Piston I.D. | H22.15 (1) | H17.15 (1) | H18.15 (1) | Polyurethane (Shore A 90) | Inner cavity friction; sludge abrasion | Clean cavity regularly; replace if cracks occur |
3. Field Fault Repair Case
Case 1: Seal-Piston O.D. Leakage (FH23-35 BOP)
Symptom: Hydraulic fluid leakage during 120℃ steam operation. Root Cause: Seal-Piston O.D. (H17.08.00) suffered thermal hardening and friction wear due to inadequate lubrication (violating API 16A § 5.3). Repair: Replaced with genuine H17.08.00 seals, applied high-temp grease, and cleaned piston surface. Preventive Measure: Lubricate every 8 hours of steam operation; monitor fluid temp strictly.
Case 2: Wear Ring Failure (FH35-35 BOP)
Symptom: Piston jamming during actuation.Root Cause: Wear ring-Piston O.D. (H18.14) worn by 3mm due to thermal softening and misalignment. Repair: Replaced wear rings, realigned piston, and adjusted operating temp to 110℃. Preventive Measure: Inspect wear depth monthly; maintain piston coaxiality.
4. FAQ
Question | Answer |
Can FH series BOP seals be cross-used between models? | No. Each model’s seals (e.g., H22.17.00 for FH18-35, H17.08.00 for FH23-35) are size-matched to piston/adapter dimensions. Cross-use causes leakage and component damage, violating API 16A safety requirements. |
How to mitigate thermal loosening of cap nuts and studs? | Retorque cap nuts to model-specific torque (350 N·m) after each thermal cycle. Apply anti-seize compound on studs (ASTM A193 B7) to prevent thread galling, and replace if thread deformation is detected. |
What is the service life of polyurethane wear rings under normal operation? | Typically 8-10 months under 110℃ cyclic steam operation. Replace when wear depth ≥2mm or cracks appear—excessive wear leads to piston misalignment and seal failure. |
5. Procurement Guidance
Genuine parts are critical for FH18-35/FH23-35/FH35-35 BOPs’ safe operation in high-temperature environments. We supply all listed main parts and one-year spares, fully compliant with API 16A and GB standards, with traceable material certificates. Our technical team provides model-specific inventory plans based on your drilling frequency. Contact us to secure authentic parts that minimize downtime and maintain well control integrity in steam-heated drilling.
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