Core Application & Equipment Compatibility
These parts are exclusively designed for the FH35-70/105K High Sulfate-Resistant Annular Blowout Preventer (BOP), a critical well control device for high-sulfur oil and gas drilling operations. Targeting drilling maintenance engineers and procurement teams in sour well environments, they address sulfide corrosion, high-pressure seal failure, and component wear—key to mitigating blowout risks. All comply with API 16A and NACE MR0175 standards, ensuring reliability in 70-105MPa pressure and high-sulfate downhole conditions.
1. Main Structural Components
These core components form the BOP’s framework, engineered with high sulfate resistance to withstand extreme sour well conditions. A drilling team resolved housing sulfide corrosion by replacing the worn part (NACE MR0175 compliant) and optimizing fluid filtration, avoiding 12+ hours of unplanned downtime. They ensure structural integrity in high-pressure, high-sulfur environments.
No. | Name | P/N | Material | Main Wear Causes | Damage Prevention Notes |
1 | Housing | SKFW14-353-03.05 | Forged AISI 4140L alloy steel, sulfide stress cracking (SSC) resistant, anti-corrosion coated per NACE MR0175 | Sulfate-induced corrosion; pressure cycling fatigue; abrasive drilling mud erosion | Conduct quarterly ultrasonic crack testing; use sulfate-resistant drilling fluid; apply NACE-certified anti-corrosion spray annually |
2 | Top Cover | SKFW14-353-03.01.00 | Sulfate-resistant alloy steel, precision-machined sealing surface, zinc-nickel plating | Sealing surface scratches; over-torque deformation; sulfur compound corrosion | Deburr surfaces before installation; torque fasteners to 550N·m (API 16A specs); clean with sulfate-compatible detergent |
3 | Piston | SKFW14-353-03.04 | Anti-sulfate alloy steel, hard chrome-plated surface, Viton seal grooves | Reciprocating wear; seal groove damage; sulfate-contaminated hydraulic fluid corrosion | Lubricate with NACE-compliant grease; replace seals every 3 months; use sulfate-resistant ISO VG 46 hydraulic oil |
4 | Sealing Rubber Core | SKFW14-353-03.02.00 | Reinforced HNBR rubber (sulfate-resistant), stainless steel core, -20℃ to 120℃ temperature tolerance | Drill pipe abrasion; high-temperature aging; sulfate compound degradation | Inspect for cuts pre-operation; limit operating temperature to ≤100℃; replace after 500 high-sulfur drilling hours |
5 | Hold-down Ring | FH3570-01 | Sulfate-resistant alloy steel, heat-treated (HRC 42-47) for hardness | Uneven pressure deformation; thread wear; sulfate-laden drilling fluid corrosion | Ensure uniform pressure distribution; inspect threads monthly; store in dry, low-sulfur environment |
6 | Wedge Block | FH3570-05 | Anti-sulfate alloy steel, zinc-nickel plated, precision-machined contact surface | Drill pipe gripping wear; sulfate corrosion; improper installation damage | Daily lubrication with molybdenum disulfide grease; anti-rust spray application; use alignment tool for installation |
2. Sealing Components
These sealing parts prevent fluid leakage in high-sulfate environments, a critical function for FH35-70/105K BOP operation. A sour well site fixed mud leakage by replacing the combination seal (API 16A compliant) and cleaning grooves, avoiding sulfate fluid contamination of hydraulic systems. They resist sulfate corrosion and extreme pressure.
No. | Name | P/N | Material | Main Wear Causes | Damage Prevention Notes |
1 | Combination Sealing Ring | SKFW14-353-03.08 | Sulfate-resistant HNBR, dual-seal design, stainless steel spring reinforcement | Gap extrusion; metal debris damage; sulfate-induced material degradation | Maintain seal gap ≤0.1mm; filter drilling mud to 2μm; inspect for extrusion pre-operation |
2 | Mud Ring | SKFW14-353-03.03 | Sulfate-resistant NBR, polyester fabric reinforcement, DIN 53505 compliant | High-sulfur mud abrasion; compression set; sulfate exposure aging | Clean mud residue post-operation; limit compression deformation to ≤20%; replace every 2 months |
3 | Combination Sealing Ring | FH3570-14-0 | Sulfate-resistant Viton (FKM), 105MPa high-pressure tolerance | Vibration wear; oxygen exposure aging; installation damage | Use seal installation tool; store in airtight container; replace every 3 months |
4 | Combination Sealing Ring | SKFW14-353-03.07.00 | Precision-molded sulfate-resistant HNBR, high-sulfur fluid compatibility | Piston reciprocation wear; sulfate fluid swelling; spring fatigue | Change hydraulic oil every 400h; weekly piston surface cleaning; replace if spring deformation occurs |
5 | Combination Sealing Ring | SKFW14-353-03.06.00 | Carbon fiber-reinforced sulfate-resistant Viton, wear-resistant | Debris scratching; sulfate corrosion; thermal aging | Lubricate with Viton-compatible grease; monthly scratch inspection; replace if wear exceeds 0.3mm |
6 | O-ring | FH3570-08 | Sulfate-resistant Viton (FKM), -20℃ to 200℃ temperature range | Sharp groove nicks; sulfate-induced hardening; incompatible fluid swelling | Deburr seal grooves; store at ≤25℃ in dry environment; use sulfate-compatible hydraulic oil |
3. Wear-Resistant Components
These parts reduce wear on core BOP components in high-sulfate, high-pressure conditions. A drilling team extended piston lifespan by 45% by replacing worn rings and maintaining NACE-compliant lubrication, cutting replacement costs in sour well operations. They are engineered for extreme wear resistance.
No. | Name | P/N | Material | Main Wear Causes | Damage Prevention Notes |
1 | Wearing Ring | FH3570-16 | 316L stainless steel, hard chrome-plated, NACE MR0175 compliant | Metal debris scratching; piston contact wear; sulfate corrosion | Clean with sulfate-compatible diesel before installation; anti-wear grease lubrication; replace if thickness ≤4.5mm |
2 | Wearing Ring | FH3570-15 | Sulfate-resistant CuSn10 bronze alloy, self-lubricating, anti-tarnish coating | Contaminated oil abrasive wear; reciprocation fatigue; sulfate-induced tarnishing | Filter hydraulic oil to 2μm; replace every 4 months; ensure piston surface smoothness (Ra ≤0.8μm) |
4. Fasteners, Lifting & Connecting Parts
These parts secure and connect BOP components, withstanding high vibration, pressure, and sulfate corrosion. A team resolved stud loosening by torqueing per GB/T 5277 and using sulfate-resistant anti-seize compound, preventing component detachment in sour well operations. They meet anti-sulfate fastener standards.
No. | Name | P/N | Material | Main Wear Causes | Damage Prevention Notes |
1 | Removal of Screw | FH3570-19 | 10.9-grade sulfate-resistant alloy steel, black oxide finish, high-torque design | Over-torque thread stripping; sulfate corrosion; vibration fatigue | Torque to 90N·m (GB/T 5277); apply sulfate-resistant anti-seize; inspect threads before reuse |
2 | Stud | FH3570-02 | 12.9-grade sulfate-resistant alloy steel, zinc-nickel plated, precision threads | Thread galling; pressure cycling fatigue; offshore sour well sulfate corrosion | Lubricate threads with anti-seize; monthly retightening; replace every 6 months in high-sulfur environments |
3 | Nut | FH3570-03A | 10.9-grade sulfate-resistant alloy steel, zinc-nickel plated, locknut design | Vibration loosening; thread wear; sulfate corrosion | Use lock washers; torque to 500N·m; monthly anti-rust spray application |
4 | Screw M24×30 | GB70-76 | 8.8-grade sulfate-resistant alloy steel, zinc-nickel plated, hexagon socket head | Excessive load shearing; thread damage; sulfate-induced corrosion | Do not exceed 22kN rated load; use matching socket tool; replace damaged threads |
5 | Screw M36×80 | GB70-76 | 10.9-grade sulfate-resistant alloy steel, zinc-nickel plated, high-strength | Uneven loading bending; thread stripping; sulfate-laden fluid corrosion | Torque to 400N·m; ensure uniform loading; clean with sulfate-compatible detergent |
6 | Lifting Eye | FH3570-04 | Sulfate-resistant Q235B carbon steel, hot-dip galvanized, 12t load rating | Lifting fatigue; sulfate corrosion; thread damage | Do not exceed rated load; weekly crack inspection; monthly thread retightening to 350N·m |
7 | Shackle | JB8112-1999 | Sulfate-resistant alloy steel, hot-dip galvanized, safety latch design | Repeated lifting fatigue; sulfate corrosion; latch damage | Inspect latch integrity pre-use; anti-corrosion spray application; dry storage |
8 | Joint | FH3570-13 | 316L stainless steel, sulfate-resistant, PTFE seal | Thread galling; seal leakage; acidic sulfate fluid corrosion | Apply anti-seize to threads; quarterly PTFE seal replacement; torque to 180N·m |
9 | Oil Plug | F02-15 | Sulfate-resistant brass, NBR O-ring seal, external hexagon | Worn O-ring leakage; thread damage; sulfate corrosion | Quarterly O-ring replacement; torque to 80N·m; anti-corrosion tape on threads |
FAQs
Question | Answer |
How to maintain FH35-70/105K BOP parts in high-sulfate environments? | Adhere to NACE MR0175 and API 16A guidelines: Use sulfate-resistant fluids and greases; inspect seals every 2-3 months; conduct quarterly ultrasonic testing on structural parts. Replace components immediately if sulfate corrosion or wear is detected to avoid well control risks. |
What key standards must FH35-70/105K BOP parts comply with? | All parts must meet API 16A (well control equipment) and NACE MR0175 (sulfide service) standards. Critical materials include sulfate-resistant alloy steel, 316L stainless steel, and HNBR/Viton seals to prevent sulfide stress cracking and material degradation. |
Procurement Guidance
Genuine parts for the FH35-70/105K High Sulfate-Resistant Annular BOP ensure compliance with API 16A and NACE MR0175, critical for safe high-sulfur oil and gas drilling. Whether for routine maintenance, structural replacements, or emergency repairs, we provide authentic parts matching original specifications. Contact our team with your sour well operation needs for tailored recommendations and professional technical support to maintain reliable BOP performance.
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