Core Application & Equipment Compatibility
These spare parts are exclusively compatible with Shenkai Annular BOP Model FHZ35-35/70, critical for oil and gas drilling well control systems. Targeting drilling maintenance engineers and procurement teams, they resolve seal leakage, component wear, and pressure failure—key to preventing well blowouts. All comply with API 16A and GB/T standards, ensuring reliability in high-pressure (70MPa) downhole environments.
1. Main Structural Components
These components form the core structure of the FHZ35-35/70 BOP, withstanding extreme downhole pressure. A drilling team fixed shell deformation by replacing the damaged part and torqueing bolts per API 16A, avoiding costly well control incidents. Made of high-strength materials, they ensure long-term structural integrity.
No. | Description | Part No./Model | Material | Main Wear Causes | Damage Prevention Notes |
1 | Bonnet | H28B.05 | Alloy steel (AISI 4140), heat-treated for wear resistance | High-pressure impact deformation; corrosion from drilling fluids | Inspect for cracks monthly per API 16A; apply anti-corrosion coating; torque fasteners to 450N·m |
2 | Shell | H37.01.00 | Forged alloy steel, compliant with API 16A material standards | Fatigue from pressure cycling; erosion by abrasive drilling mud | Conduct ultrasonic testing quarterly; filter drilling mud to 2μm; avoid pressure spikes above 70MPa |
3 | Body Sleeve | H28.14.00 | Stainless steel (316L), hard chrome-plated surface | Scratching from metal debris; wear from piston reciprocation | Clean with diesel before installation; inspect surface finish monthly; lubricate with API-certified grease |
4 | Piston | H28B.06 | Alloy steel piston body, Viton seal grooves | Seal groove wear; corrosion from hydraulic fluid contamination | Replace seals every 3 months; use ISO VG 46 hydraulic oil (DIN 51524); clean piston surface weekly |
5 | Tapered Packer | H28.09.00 | Reinforced rubber (HNBR), steel core | Abrasion from drill pipe; aging from high temperature (≥80℃) | Inspect for cuts before each use; limit operating temp to ≤70℃; replace after 500 drilling hours |
6 | Anti-wear Plate | H28.10 | Wear-resistant alloy (Stellite), welded base | Impact damage from drill pipe; erosion from high-velocity fluids | Install with wear-resistant welding rods; inspect thickness monthly; avoid direct drill pipe impact |
7 | Jaw Chuck | H28.11 | Alloy steel, heat-treated for hardness (HRC 45-50) | Tooth wear from gripping drill pipe; corrosion from moisture | Lubricate teeth daily with molybdenum disulfide grease; apply anti-rust spray; replace when tooth wear exceeds 0.5mm |
8 | Bonnet Chuck | FHZ5414-04 | Alloy steel, zinc-plated for corrosion resistance | Thread damage from over-torque; fatigue from pressure cycling | Torque to 350N·m per GB/T 5277; inspect threads before installation; replace every 6 months |
9 | Adapter Substitute | FHZ5414-10 | Stainless steel (304), precision-machined threads | Thread galling from improper lubrication; corrosion from saltwater | Apply anti-seize compound to threads; use marine-grade anti-corrosion spray; torque to 400N·m |
10 | Shackle | S-BX4.75-3/4 | Carbon steel (Q235), hot-dip galvanized | Fatigue from lifting loads; corrosion from outdoor exposure | Never exceed rated load (4.75t); inspect for cracks weekly; re-galvanize annually |
2. Sealing Components (O-rings/Sealing Rings)
These seals prevent fluid leakage in the FHZ35-35/70 BOP, critical for well control. A drilling site resolved hydraulic leakage by replacing aged O-rings and cleaning seal grooves, complying with API 16A seal standards. They resist high pressure and drilling fluid corrosion.
No. | Description | Part No./Model | Material | Main Wear Causes | Damage Prevention Notes |
1 | O-ring | H28.01 | Viton (FKM), temperature-resistant (-20℃ to 200℃) | Aging from high temperature; nicks from sharp seal grooves | Store in cool, dry place (≤25℃); inspect grooves for burrs; replace every 3 months |
2 | Inner Sealing Ring of Bonnet | H28.02 | HNBR (Hydrogenated Nitrile), oil-resistant | Compression set from long-term pressure; swelling from incompatible hydraulic oil | Avoid over-compression (max 20% deformation); use HNBR-compatible oil; replace after 4 months |
3 | Upper Sealing Ring of Piston | H28.03 | Viton (FKM), reinforced with polyester fabric | Wear from piston reciprocation; damage from metal debris | Lubricate with Viton-compatible grease; filter hydraulic oil to 3μm; inspect for wear weekly |
4 | Lower Sealing Ring of Piston | H28.04 | Viton (FKM), reinforced with polyester fabric | Extrusion through seal gaps; corrosion from drilling fluid contamination | Ensure seal gap ≤0.1mm; clean hydraulic system monthly; replace if extrusion is detected |
5 | O-ring | 53×5.3 | NBR (Nitrile Rubber), oil-resistant (DIN 53505) | Swelling from hydraulic oil; aging from oxygen exposure | Store in airtight container; use NBR-compatible oil; replace every 2 months |
6 | O-ring | 25×2.65 | NBR (Nitrile Rubber), oil-resistant (DIN 53505) | Pinching during installation; wear from vibration | Use O-ring installation tool; secure components with vibration-damping mounts; inspect after each disassembly |
3. Fasteners (Screws/Bolts/Screw Plugs)
These fasteners secure FHZ35-35/70 BOP components, withstanding high vibration and pressure. A team resolved bolt loosening by using lock washers and torqueing per GB/T standards, preventing component detachment. They meet industrial fastener standards for reliability.
No. | Description | Part No./Model | Material | Main Wear Causes | Damage Prevention Notes |
1 | Screw | GB/T70.1 M12×40 | Alloy steel (8.8 grade), zinc-plated | Thread stripping from over-torque; corrosion from moisture | Torque to 80N·m per GB/T 5277; apply anti-rust spray; replace if threads are damaged |
2 | Screw | GB/T70.1 M12×70 | Alloy steel (8.8 grade), zinc-plated | Fatigue from vibration; bending from uneven loading | Use lock washers; retighten monthly; inspect for bending with straightedge |
3 | Supporting Screw of Jaw Chuck | H28.13 | Alloy steel (10.9 grade), black oxide finish | Wear from jaw chuck adjustment; corrosion from drilling fluids | Lubricate threads weekly; clean with diesel after use; torque to 60N·m |
4 | Screw of Jaw Chuck | H28.12 | Alloy steel (10.9 grade), black oxide finish | Thread galling from improper lubrication; wear from repeated tightening | Apply anti-seize compound; avoid over-tightening; replace every 6 months |
5 | Bolt | GB/T5783 M12×35 | Alloy steel (8.8 grade), zinc-plated | Shearing from excessive load; corrosion from saltwater (offshore) | Never exceed rated load; use marine-grade anti-corrosion coating; inspect for shear cracks monthly |
6 | Z1” External Hexagonal Screw Plug | 2C01.21 | Stainless steel (316L), PTFE seal | Leakage from damaged PTFE seal; thread damage from over-torque | Replace PTFE seal annually; torque to 100N·m; inspect threads before installation |
7 | Screw Plug Z 3/4” | SFZ1310-01 | Brass, NBR O-ring seal | Corrosion from acidic drilling fluids; O-ring wear from vibration | Apply anti-corrosion tape; replace O-ring every 3 months; torque to 70N·m |
4. One-Year Spare Parts Kit
This kit contains high-wear seals for annual FHZ35-35/70 BOP maintenance, reducing unplanned downtime. It aligns with API 16A maintenance guidelines, ensuring critical seals are readily available for routine replacements in oilfield operations.
No. | Description | Part No./Model | Material | Main Wear Causes | Storage & Usage Notes |
1 | O-ring | H28.01 | Viton (FKM) | Aging from temperature; nicks from improper storage | Store at -5℃ to 25℃; avoid direct sunlight; use within 12 months of receipt |
2 | Inner Sealing Ring of Bonnet | H28.02 | HNBR | Compression set; oil contamination | Store in airtight bag; avoid contact with incompatible oils; inspect before installation |
3 | Upper Sealing Ring of Piston | H28.03 | Reinforced Viton | Reciprocating wear; debris damage | Lubricate before use; clean seal groove thoroughly; replace if wear is visible |
4 | Lower Sealing Ring of Piston | H28.04 | Reinforced Viton | Extrusion; corrosion | Ensure proper seal fit; avoid over-compression; discard if deformed |
5 | O-ring | 53×5.3 | NBR | Swelling; aging | Store in dry environment; use NBR-compatible oil; replace in sets for consistency |
6 | O-ring | 25×2.65 | NBR | Pinching; vibration wear | Use installation tool; check seal seat for burrs; replace after each disassembly |
FAQ
Question | Answer |
How often should seals of the FHZ35-35/70 BOP be replaced? | Follow API 16A guidelines: Viton/HNBR seals every 3-4 months, or after 500 drilling hours. Replace immediately if leakage, cuts, or swelling is detected to avoid well control risks. |
What standards should fasteners for this BOP comply with? | Fasteners must meet GB/T 70.1, GB/T 5783, and API 16A standards. Use 8.8/10.9 grade alloy steel fasteners, torque per GB/T 5277, and inspect for corrosion monthly in offshore environments. |
Procurement Guidance
Genuine Shenkai FHZ35-35/70 BOP spare parts ensure compliance with API 16A and GB/T standards, critical for safe oil and gas drilling operations. Whether you need routine maintenance kits, structural components, or emergency replacements, we provide authentic parts matching original specifications. Contact our team with your drilling operation requirements for tailored recommendations and professional technical support to keep your BOP system reliable.
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