Shenkai BOP Replacement & Original Parts for FH23-35 & FH23-35/70

1

Bonnet

H14.03.00 / N/A (FH23-35 exclusive)

Forged alloy steel (4140 HTS) with carburized surface hardening; compliant with API 16A material requirements for well control equipment; tensile strength ≥ 950 MPa

1. Stress concentration cracking at bolt holes due to improper torque application or over-tightening; 2. Corrosion pitting and hydrogen-induced cracking (HIC) in sour service environments (H2S-containing fluids); 3. Deformation from pressure spikes during well kick events

1. Torque all bonnet bolts to Shenkai’s OE-specified values using calibrated torque wrenches; retorque after the first 10 BOP actuations. 2. For sour service applications, implement NACE MR0175/ISO 15156-compliant corrosion mitigation (e.g., inhibitor injection) and conduct quarterly ultrasonic testing (UT) to detect hidden pitting. 3. Install pressure relief valves to limit pressure spikes above the BOP’s rated working pressure; inspect bonnet for deformation post-well kick response.

2

Piston

H14.10 / N/A (FH23-35 exclusive)

High-strength carbon steel (A36) with hard chrome plating (plating thickness ≥ 0.05 mm) for wear resistance; integrated sealing grooves machined to OE tolerances

1. Plating flaking and O.D. wear due to friction against the BOP housing or contaminated hydraulic fluid; 2. Seal groove deformation from excessive hydraulic pressure; 3. Corrosion of the steel substrate due to plating damage

1. Maintain hydraulic fluid cleanliness per ISO 4406 Class 18/15/12 standards; install high-efficiency filters and magnetic separators to remove abrasive particles and metal debris. 2. Lubricate the piston O.D. and seal grooves with molybdenum disulfide (moly) grease compatible with adjacent sealing materials before assembly. 3. Inspect piston plating for flaking and O.D. for wear during each maintenance cycle; replace if wear exceeds 0.5 mm or plating integrity is compromised.

3

Shell

H14.01 (FH23-35) / H34.01 (FH23-35/70)

Cast alloy steel (ASTM A216 WCB) with normalized heat treatment; internal surfaces precision-machined for smooth piston movement; corrosion-resistant coating applied to external surfaces

1. Internal surface scratching from contaminated hydraulic fluid or misaligned piston; 2. External corrosion from exposure to marine or harsh onshore environments; 3. Stress cracking at weld joints (if applicable) from cyclic pressure loading

1. Inspect internal shell surfaces for scratches during maintenance; polish minor scratches (depth < 0.2 mm) with fine-grit sandpaper; replace shell for deeper scratches. 2. Reapply corrosion-resistant coating to external surfaces annually or as needed based on environmental exposure. 3. Conduct magnetic particle inspection (MPI) on weld joints every 6 months to detect fatigue cracking; follow API 16A NDT (Non-Destructive Testing) protocols.

4

Adapter Substitute

FH2835-13 / FH2835-13 (Common for both models)

Stainless steel 316L for corrosion resistance; precision-machined to ensure dimensional compatibility with both FH23-35 and FH23-35/70 BOP interfaces

1. Thread galling during installation/removal due to improper lubrication; 2. Corrosion in saltwater or sour service environments; 3. Dimensional distortion from excessive torque

1. Apply anti-seize compound (compatible with stainless steel) to threads before installation; avoid over-torquing by following Shenkai’s torque specifications. 2. For marine or sour service, rinse the adapter substitute with fresh water post-operation and apply a protective lubricant. 3. Inspect threads for galling or damage after each removal; repair minor damage with thread chasers or replace if severe.

1

Packer

N/A (FH23-35) / N/A (FH23-35/70) - Contact Shenkai for OE part number

Hydrogenated nitrile rubber (HNBR) with polyester fiber reinforcement; compatible with oil-based and water-based drilling fluids; temperature rating: -40°C to 150°C; shore hardness: 75±5 A

1. Extrusion damage through gaps between metal components under high pressure; 2. Thermal degradation in high-temperature wellbores (exceeding 150°C); 3. Abrasive wear from drilling fluid containing sand or cuttings

1. Inspect the clearance gap between the packer and mating metal parts before installation; replace worn metal components if gaps exceed 0.3 mm. 2. For wellbores with temperatures above 150°C, upgrade to fluoroelastomer (FKM) packers (consult Shenkai for compatibility). 3. Use high-efficiency shale shakers and desanders to reduce solid content in drilling fluid; clean the BOP cavity thoroughly before packer installation.

2

Seal-Adapter Ring I.D.(1)

H14.07 / N/A (FH23-35 exclusive)

Nitrile rubber (NBR) with a rigid steel insert for dimensional stability; compliant with ASTM D2000 standard; resistant to petroleum-based fluids

1. Compression set (permanent deformation) from long-term static pressure application; 2. Chemical degradation from exposure to synthetic drilling fluids (e.g., ester-based muds); 3. Mechanical damage from improper installation tools (e.g., metal scrapers)

1. Relieve static pressure on the BOP during long shutdown periods (≥72 hours) to prevent compression set. 2. Verify NBR compatibility with synthetic drilling fluids; use FKM adapter rings if incompatibility is identified. 3. Use non-metallic installation tools (e.g., rubber mallets, plastic scrapers) to avoid damaging the rubber surface during assembly.

3

O-ring (Adapter Ring O.D.)

H14.09 / N/A (FH23-35 exclusive)

Nitrile rubber (NBR) conforming to GB/T 3452.1; temperature rating: -20°C to 120°C; excellent resistance to hydraulic oils and oil-based muds

1. Pinching or cutting from sharp edges on mating metal components; 2. Swelling and softening from exposure to OBM additives (e.g., surfactants); 3. Ozone cracking in outdoor storage environments

1. Deburr all mating metal surfaces before O-ring installation; inspect for sharp edges with a tactile check. 2. Test sample O-rings in the intended drilling fluid to confirm compatibility. 3. Store O-rings in a cool, dark, and dry environment; use ozone-resistant storage bags to prevent atmospheric degradation.

4

Adapter Ring

H14.08 / N/A (FH23-35 exclusive)

Fluoroelastomer (FKM) with stainless steel 316 reinforcement; chemical resistance to acids, bases, and sour gas (H2S); temperature rating: -26°C to 200°C

1. Erosion from high-velocity drilling fluid flow through the BOP; 2. Stress cracking at the steel-rubber bond interface; 3. Thermal fatigue from rapid temperature fluctuations

1. Optimize well circulation rates to reduce fluid velocity at the adapter ring interface; install flow diffusers if necessary. 2. Inspect the steel-rubber bond for separation during maintenance; replace if any delamination is detected. 3. Avoid rapid BOP actuation during temperature transitions; allow the adapter ring to acclimate to temperature changes.

5

Seal-Shell

H14.12.01 / N/A (FH23-35 exclusive)

Aluminum alloy (6061-T6) with anodized surface treatment; integrated NBR sealing elements; lightweight and corrosion-resistant

1. Anodization wear leading to aluminum corrosion; 2. Damage to integrated seals from improper handling; 3. Deformation from over-tightening of mounting bolts

1. Clean the seal-shell surface with mild detergent (avoid harsh solvents) during maintenance; reapply anti-corrosion coating if anodization is worn. 2. Handle seal-shells with care to avoid impacting the integrated seals; store in padded containers. 3. Torque mounting bolts to Shenkai’s specified values; use torque limiters to prevent over-tightening.

6

O-ring (Seal-Shell)

H14.12.02 / N/A (FH23-35 exclusive)

Hydrogenated nitrile rubber (HNBR); high wear resistance and low compression set; temperature rating: -20°C to 175°C

1. Abrasive wear from contaminated hydraulic fluid; 2. Compression fatigue from repeated BOP actuation; 3. Chemical attack from incompatible hydraulic fluid additives

1. Maintain hydraulic fluid cleanliness per ISO 4406 Class 16/13/10; replace hydraulic filters regularly. 2. Track BOP actuation cycles; replace O-rings after 500 cycles or as specified in Shenkai’s maintenance manual. 3. Use only hydraulic fluid additives approved by Shenkai; avoid mixing different fluid types.

7

O-ring (Shell)

H14.16 / N/A (FH23-35 exclusive)

Silicone rubber (VMQ); excellent low-temperature flexibility; temperature rating: -60°C to 200°C; resistant to oxidation and ozone

1. Brittle fracture in cold environments (below -60°C); 2. Swelling from exposure to petroleum-based fluids; 3. UV degradation from outdoor storage

1. For arctic or deepwater applications (temperatures below -60°C), upgrade to perfluoroelastomer (FFKM) O-rings. 2. Ensure the O-ring is not exposed to petroleum-based fluids; use VMQ-compatible lubricants during installation. 3. Store O-rings in a UV-protected container; avoid direct sunlight.

8

Seal-Adapter Ring I.D.(2)

H14.11.01 / N/A (FH23-35 exclusive)

Fluoroelastomer (FKM) with brass insert; chemical resistance to aggressive drilling fluids and sour gas; compliant with NACE MR0175/ISO 15156 for sour service

1. Hydrogen-induced cracking (HIC) of the brass insert in sour service; 2. Rubber degradation from high-temperature wellbore fluids; 3. Misalignment wear due to improper BOP assembly

1. For sour service (H2S content >50 ppm), verify the brass insert meets NACE MR0175/ISO 15156 requirements. 2. Monitor wellbore temperature; replace if operating temperature exceeds 200°C (FKM’s upper limit). 3. Use precision alignment tools during BOP assembly to ensure the adapter ring is centered; check for misalignment with a feeler gauge.

9

Large O-ring (600*7)

600*7 / N/A (FH23-35 exclusive)

Perfluoroelastomer (FFKM); ultra-high chemical resistance; temperature rating: -26°C to 288°C; conforms to ASTM D1418

1. Installation damage from sharp metal edges or improper stretching; 2. Compression set from long-term static load; 3. Moisture-induced degradation during storage (FFKM is sensitive to moisture)

1. Use FFKM-compatible installation tools (e.g., Teflon-coated scrapers) and avoid stretching the O-ring beyond 5% of its original diameter. 2. Relieve static load on the O-ring during shutdowns; rotate the BOP piston slightly every 30 days to redistribute the load. 3. Store FFKM O-rings in a dry environment with relative humidity <60%; use desiccants in storage containers.

10

Seal Piston O.D.

H14.15.01 / N/A (FH23-35 exclusive)

Polyurethane (PU) with high abrasion resistance; integrated NBR backup rings; shore hardness: 90±5 A

1. Abrasive wear from contact with the BOP housing or contaminated hydraulic fluid; 2. Backup ring failure leading to seal extrusion; 3. Chemical degradation from drilling fluid leakage into the hydraulic system

1. Inspect the BOP housing for scratches or wear; repair or replace if surface roughness exceeds Ra 0.8 μm. 2. Ensure backup rings are properly installed to prevent seal extrusion; replace backup rings whenever the main seal is replaced. 3. Maintain proper hydraulic system pressure to prevent drilling fluid from leaking into the piston cavity; install check valves to isolate the hydraulic circuit.

11

O-ring (Seal Piston O.D.)

H14.15.02 / N/A (FH23-35 exclusive)

Nitrile rubber (NBR) with carbon black reinforcement; enhanced wear resistance for dynamic applications; temperature rating: -30°C to 120°C

1. Dynamic wear from repeated piston movement; 2. Heat buildup from friction during high-frequency actuation; 3. Swelling from exposure to water-based drilling fluids with high salt content

1. Lubricate the O-ring with NBR-compatible grease (e.g., lithium-based) before installation to reduce friction. 2. Limit high-frequency BOP actuation (more than 10 cycles per hour) to emergency scenarios only; allow the O-ring to cool between cycles. 3. For high-salt drilling fluids, use salt-resistant NBR formulations; rinse the piston cavity with fresh water after use in saltwater wells.

12

O ring (Cap nut)

GB/T3452.1 58*3.55 / N/A (FH23-35 exclusive)

Nitrile rubber (NBR); conforms to GB/T 3452.1 standard; compatible with hydraulic oils and drilling fluid additives

1. Compression set from over-tightening of cap nuts; 2. Damage from metal-to-metal contact during cap nut installation; 3. Chemical degradation from exposure to drilling fluids

1. Torque cap nuts to specified values to avoid over-compressing the O-ring. 2. Ensure the O-ring is properly seated in the groove before tightening the cap nut; avoid pinching. 3. Clean the O-ring and groove thoroughly before installation; remove any drilling fluid residue.

1

Wear ring-adapter ring I.D.

N/A (FH23-35) / N/A (FH23-35/70) - Not applicable for these models

Not applicable

Not applicable

Not applicable - This part is not required for Shenkai FH23-35 and FH23-35/70 BOPs. Consult Shenkai’s OE manual for confirmation.

2

Wear ring-adapter ring O.D.

H14.14 / N/A (FH23-35 exclusive)

Polytetrafluoroethylene (PTFE) with glass fiber reinforcement; low friction coefficient (μ < 0.1); temperature rating: -200°C to 260°C

1. Abrasive wear from contaminated hydraulic fluid (e.g., sand, metal particles); 2. Thermal degradation in high-temperature wellbores (exceeding 260°C); 3. Deformation from excessive radial pressure

1. Maintain hydraulic fluid cleanliness per ISO 4406 Class 16/13/10; install magnetic filters to remove metal particles. 2. For wellbores with temperatures above 260°C, upgrade to polyimide (PI) wear rings. 3. Ensure radial pressure does not exceed the wear ring’s rated limits; inspect the adapter ring for proper alignment.

3

Wear ring-shell

H14.03 / N/A (FH23-35 exclusive)

Nylon 66 with molybdenum disulfide (MoS2) additive; self-lubricating and high impact resistance; temperature rating: -40°C to 120°C

1. Impact damage during BOP assembly or transportation; 2. Abrasive wear from contact with the shell or piston; 3. Hydrolysis in high-humidity environments

1. Handle wear rings with care during assembly and transportation; avoid dropping or impacting. 2. Inspect the shell and piston surfaces for smoothness; replace or repair if scratches or wear are detected. 3. Store wear rings in a dry environment with relative humidity <70%; use moisture-proof packaging for long-term storage.

1

Cap nut

H14.05 / N/A (FH23-35 exclusive)

High-strength alloy steel (4140) with zinc plating for corrosion resistance; tensile strength ≥ 800 MPa; conforms to ISO 8676

1. Thread wear or galling during installation/removal; 2. Corrosion in marine or sour service environments; 3. Loosening due to drilling vibrations

1. Apply anti-seize compound to threads before installation; avoid over-torquing. 2. For marine or sour service, use corrosion-resistant cap nuts (e.g., stainless steel 316) or reapply zinc plating annually. 3. Use thread-locking adhesives (compatible with alloy steel) to prevent loosening from vibrations.

2

Stud

H14.02 / N/A (FH23-35 exclusive)

High-tensile steel (8.8 grade) with black oxide finish; corrosion-resistant and high load-bearing capacity; conforms to ISO 898-1

1. Thread stretching or failure due to over-torquing; 2. Corrosion pitting in harsh environments; 3. Fatigue cracking from cyclic vibration

1. Torque studs to Shenkai’s specified values using a calibrated torque wrench; never exceed the maximum torque rating. 2. Inspect studs for corrosion and thread damage during each maintenance cycle; replace if pitting or wear is detected. 3. Conduct MPI testing on studs every 6 months to detect fatigue cracking; follow API 16A NDT protocols.

3

NPT 1" Plug

2C01.21 / 2C01.21 (Common for both models)

Stainless steel 316L for corrosion resistance; NPT (National Pipe Taper) thread for pressure-tight sealing; conforms to ASME B1.20.1

1. Thread damage during installation/removal; 2. Corrosion in sour or saltwater environments; 3. Leakage due to improper thread sealing

1. Use a thread sealant (compatible with stainless steel and drilling fluids) during installation; avoid over-tightening. 2. Inspect threads for damage before installation; repair minor damage with thread chasers. 3. For sour service, verify the plug meets NACE MR0175/ISO 15156 requirements; replace if corrosion is detected.

4

NPT 1/2" Plug

N/A (FH23-35) / N/A (FH23-35/70) - Not applicable for these models

Not applicable

Not applicable

Not applicable - This part is not required for Shenkai FH23-35 and FH23-35/70 BOPs. Consult Shenkai’s OE manual for the correct plug specifications for unused ports.