Core Application & Target User Overviewaa
This guide focuses on FZ35-70 series seal parts exclusively compatible with Rongsheng, HBRS, and Shenkai Blowout Preventers (BOPs)—critical equipment widely used in oil and gas drilling operations. It is tailored to meet the refined needs of professional groups including oilfield procurement managers, drilling platform maintenance technicians, and BOP service providers. The core purpose of these seals is to ensure reliable sealing performance at key joints and pressure-bearing components of FZ35-70 BOPs, preventing wellbore fluid leakage, maintaining downhole pressure stability, and ultimately safeguarding drilling operational safety. All content adheres to API Specification 6A (the global authoritative standard for wellhead and Christmas tree equipment) and the original equipment manufacturer (OEM) technical requirements of Rongsheng, HBRS, and Shenkai. It serves as a dual reference for accurate procurement and efficient technical troubleshooting, helping users avoid risks such as seal failure-induced blowout hazards and unplanned downtime.
Classified Seal Parts by BOP Brand
1. Seal Parts for Rongsheng BOP (FZ35-70 Series)
Scenario Anchoring: Rongsheng FZ35-70 BOPs are mainly deployed in medium-deep oil and gas wells with high downhole pressure and complex formation fluid conditions (containing hydrogen sulfide, carbon dioxide, and other corrosive media). The seals are core components bearing long-term high-pressure impact and chemical erosion. Value Proposition: These OEM-matched seals adopt corrosion-resistant and high-pressure-resistant composite materials, ensuring tight sealing under extreme working conditions (pressure up to 70MPa, temperature range -40℃ to 120℃). They effectively extend the service life of BOPs and reduce maintenance frequency. Pain Point Resolution: Addresses industry-wide pain points such as premature seal failure due to corrosive formation fluids, seal deformation under high pressure leading to leakage, and incompatible replacement parts causing secondary damage to BOP components. Authoritative Terminology: Complies with API 6A 21st Edition requirements and Rongsheng's Q/RSP 008-2024 BOP seal component quality standard; all parts have passed NACE MR0175 anti-sulfide corrosion certification.
No. | Part No. | BOP Brand & Model | Material Specification | Key Wear Causes | Damage Prevention Guidelines |
1 | RJ11148.30.00 | Rongsheng BOP FZ35-70 | Viton® (FKM) composite rubber with carbon fiber reinforcement; metal skeleton: 316L stainless steel | Erosion and swelling caused by hydrogen sulfide (H₂S) and carbon dioxide (CO₂) in formation fluids; permanent deformation under long-term high-pressure compression; abrasion from tiny solid particles in wellbore fluids | Store seals in a cool, dry environment (temperature 0℃-25℃, relative humidity ≤60%) to avoid aging; inspect the seal surface for cracks or bulges before installation; use compatible lubricants (silicone-based) during assembly; replace seals every 6 months or after 15 well completion operations, whichever comes first |
2 | RS11148.41.00 | Rongsheng BOP FZ35-70 | HNBR (Hydrogenated Nitrile Butadiene Rubber); hardness: 75±5 Shore A | Fatigue cracking due to frequent opening and closing of BOP rams; thermal aging in high-temperature downhole environments (exceeding 120℃); chemical degradation from incompatible drilling fluid additives | Avoid mixing different types of rubber seals during storage; check the ram sealing surface for scratches before installation (allowable scratch depth ≤0.1mm); control drilling fluid temperature within the seal's rated range; conduct pressure testing monthly in accordance with API 6A standards |
3 | RS11148.41.03 | Rongsheng BOP FZ35-70 | PTFE (Polytetrafluoroethylene) wrapped O-ring; inner core: NBR rubber | Abrasion of PTFE layer by high-velocity hydraulic oil flow; extrusion deformation at hydraulic port edges; contamination of hydraulic oil leading to accelerated wear | Filter hydraulic oil to maintain NAS 7-level cleanliness; ensure the hydraulic port edge is deburred (radius ≥0.5mm) before installation; replace the hydraulic oil filter element every 500 operating hours; avoid sudden pressure surges in the hydraulic system (limit pressure rise rate ≤5MPa/s) |
4 | RS11148.41.02 | Rongsheng BOP FZ35-70 | Flexible graphite composite with 304 stainless steel core; pressure resistance: ≥70MPa | Compression fatigue from improper bolt torque; corrosion of stainless steel core by saltwater in offshore drilling environments; leakage caused by uneven sealing surface pressure | Tighten bolts using a torque wrench in accordance with Rongsheng's specified torque value (450±20 N·m); apply anti-corrosion grease to bolt threads for offshore operations; inspect the sealing surface for flatness before assembly (flatness tolerance ≤0.02mm/m) |
2. Seal Parts for Shenkai BOP (FZ35-70 Series)
Scenario Anchoring: Shenkai FZ35-70 BOPs are widely used in onshore and offshore oil and gas drilling projects, operating in harsh environments such as high salinity (offshore), large temperature fluctuations, and high sand content in formation fluids. The seals are critical for maintaining the BOP's pressure-bearing capacity and operational reliability.Value Proposition: OEM-compatible seals for Shenkai FZ35-70 feature precise dimensional accuracy (tolerance ±0.01mm) and enhanced environmental adaptability, ensuring perfect fit with Shenkai BOP components and stable sealing performance in complex working conditions. Pain Point Resolution: Solves problems such as seal misalignment due to dimensional mismatch, rapid wear in high-sand-content environments, and corrosion failure in offshore saltwater environments. Authoritative Terminology: Meets Shenkai's SK-BOP-007 seal component technical specification and API 6A Annex F requirements; passed ISO 14644-1 Class 8 cleanroom manufacturing certification to ensure product cleanliness.
No. | Part No. | BOP Brand & Model | Material Specification | Key Wear Causes | Damage Prevention Guidelines |
1 | SFZ1310-13 | Shenkai BOP FZ35-70 | FKM (Fluoroelastomer) with ceramic particle reinforcement; metal insert: 2205 duplex stainless steel | Abrasion by sand particles in formation fluids; galvanic corrosion of metal insert in offshore saltwater environments; thermal stress cracking due to rapid temperature changes (e.g., well kick handling) | Install a sand control filter in the wellbore fluid circulation system; use anti-galvanic corrosion gaskets between the seal and BOP body for offshore operations; avoid rapid heating or cooling of the BOP (temperature change rate ≤10℃/min); inspect the seal for sand wear every well completion |
2 | SFZ1310-14 | Shenkai BOP FZ35-70 | PU (Polyurethane) with PTFE coating; elongation at break: ≥400% | Scratches on the seal surface caused by burrs on the piston rod; fatigue wear due to reciprocating motion of the piston; oil degradation leading to loss of lubrication | Polish the piston rod surface to Ra ≤0.2μm before installation; check for burrs or defects on the rod surface regularly; use hydraulic oil with anti-wear additives (meeting ISO VG 46 standard); replace the seal every 800 reciprocating cycles of the piston |
3 | SFZ1310-18 | Shenkai BOP FZ35-70 | Spiral wound gasket: flexible graphite + 316L stainless steel; inner ring: Inconel 625 | Compression set due to over-tightening of flange bolts; corrosion of stainless steel winding by H₂S; leakage caused by flange surface damage | Follow the "cross-tightening" method when tightening flange bolts; control bolt torque within Shenkai's specified range (380±15 N·m); inspect the flange surface for damage before assembly; for H₂S-containing wells, use Inconel 625 inner ring gaskets |
4 | SFZ1310-19 | Shenkai BOP FZ35-70 | NBR (Nitrile Butadiene Rubber) with nylon fabric reinforcement; hardness: 70±5 Shore A | Abrasion from frequent valve opening and closing; chemical attack from drilling fluid additives (e.g., surfactants); aging caused by long-term exposure to sunlight (for onshore BOPs) | Store onshore BOP control valves in shaded areas to avoid direct sunlight; use drilling fluid additives compatible with NBR rubber; lubricate the valve seal with petroleum jelly before installation; replace the seal every 3 months for frequently used valves |
5 | F03-23 | Shenkai BOP FZ35-70 | Silicone rubber (VMQ) with metal washer; temperature resistance: -60℃ to 200℃ | Brittleness and cracking in low-temperature environments (e.g., winter onshore drilling); deformation under high pressure; contamination of the seal surface affecting sealing performance | For low-temperature operations (below -20℃), pre-heat the seal to 10℃-20℃ before installation; ensure the pressure gauge port is clean and free of debris; check the seal for brittleness monthly in cold regions; replace the seal if it becomes hard or loses elasticity |
6 | F03-24 | Shenkai BOP FZ35-70 | EPDM (Ethylene Propylene Diene Monomer) rubber; weather resistance: UV grade 4 | Weathering and aging due to long-term outdoor exposure; leakage caused by improper installation torque; corrosion of the seal plug thread | Apply thread sealant (compatible with EPDM) during installation; tighten the seal plug to the specified torque (80±5 N·m); apply anti-UV protective coating to the seal surface for onshore BOPs; inspect the seal for cracks or peeling every month |
7 | SFZ1710.07-00 | Shenkai BOP FZ35-70 | Reinforced natural rubber (NR) with steel wire mesh; tear strength: ≥35 kN/m | Tear damage during BOP closing under high pressure; aging and hardening due to long-term storage; abrasion by casing or drill pipe | Store the rubber core in a dark, dry warehouse to avoid direct sunlight and ozone exposure; avoid excessive closing pressure (control within 70MPa); inspect the rubber core for tears or bulges before each use; replace the rubber core after 20 well kick prevention operations |
8 | SFZ1310.-25 | Shenkai BOP FZ35-70 | FKM (Viton®) with aramid fiber reinforcement; pressure resistance: ≥100MPa | Fatigue failure due to frequent pressure charging and discharging of the accumulator; chemical degradation from hydraulic oil impurities; thermal aging in high-temperature environments | Maintain hydraulic oil cleanliness at NAS 6 level; limit the accumulator's pressure charging rate ≤8MPa/s; inspect the seal for oil leakage every week; replace the seal every 12 months or 500 pressure cycles, whichever comes first |
9 | SFZ1310-24 | Shenkai BOP FZ35-70 | Rubber-asbestos composite; fire resistance: UL 94 V-0 | Compression deformation from long-term closure; damage from mechanical impact during maintenance; moisture absorption leading to reduced sealing performance | Loosen the manhole cover bolts slightly every month to relieve long-term compression; handle the seal with care during maintenance to avoid impact; store spare seals in a dry environment to prevent moisture absorption; replace the seal if it becomes soft or loses resilience |
10 | SFZ1310-23 | Shenkai BOP FZ35-70 | HNBR (Hydrogenated Nitrile Butadiene Rubber) with PTFE backup ring; extrusion resistance: ≥25MPa | Extrusion damage due to high hydraulic pressure; abrasion from piston rod reciprocation; corrosion from water in hydraulic oil | Install PTFE backup rings on both sides of the seal to prevent extrusion; dewater the hydraulic system regularly to maintain water content ≤0.1%; polish the piston rod surface to avoid scratches; inspect the seal for extrusion marks every 200 operating hours |
11 | SFZ1310-12 | Shenkai BOP FZ35-70 | Ceramic-rubber composite; wear resistance: ≥10⁶ cycles | Abrasion from fluid flow and solid particles; thermal stress due to temperature fluctuations; leakage caused by valve seat misalignment | Ensure the gate valve is fully open or closed during operation to reduce fluid scouring; align the valve seat precisely during installation; inspect the seal for wear using ultrasonic testing every 6 months; replace the seal when wear depth exceeds 0.5mm |
Procurement & Maintenance Standards
To ensure the safe and reliable operation of Rongsheng/HBRS/Shenkai FZ35-70 BOPs, the following procurement and maintenance standards are recommended, serving as authoritative references for both procurement decisions and technical troubleshooting:
1. Procurement Standards:
- Source seals exclusively from authorized suppliers to guarantee compliance with OEM technical specifications and API 6A standards. Verify product certification documents (including NACE MR0175, ISO 14644-1) before purchase.
- Confirm the dimensional accuracy and material compatibility of seals with the target BOP model (Rongsheng or Shenkai FZ35-70) to avoid mismatch risks.
- Prioritize seals with traceability codes for full lifecycle management, enabling quick tracking of production batch and quality inspection records.
2. Pre-Installation Inspection:
- Inspect seals for surface defects (cracks, bulges, scratches) and dimensional deviations using precision measuring tools (e.g., micrometers, calipers).
- Clean the BOP sealing surface thoroughly to remove oil, debris, and rust; ensure the surface flatness and roughness meet OEM requirements.
- Verify that the installation tools are compatible with the seal material to avoid damage during assembly (e.g., use plastic or copper tools for rubber seals).
3. Routine Maintenance:
- Establish a maintenance schedule based on operating conditions: for onshore wells, inspect seals monthly; for offshore and high-sulfide wells, inspect weekly.
- Conduct regular pressure testing in accordance with API 6A standards to verify sealing performance; replace seals immediately if leakage is detected.
- Store spare seals in a dedicated clean warehouse, avoiding contact with oil, chemicals, and direct sunlight; follow the "first-in-first-out" principle for inventory management.
4. Failure Handling:
- For seal failure, conduct root cause analysis (e.g., chemical analysis of fluid, dimensional inspection of BOP components) to prevent recurrence.
- Replace all seals in the same assembly simultaneously to ensure consistent performance; avoid mixing new and used seals.
Call to Action
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