Shenkai BOP Rubber Seals & Parts for MODEL NO. FH18/70 & FH18/105

1

Bonnet

H09.04.00

Forged alloy steel (4140 HTS) with carburized surface treatment; compliant with API 16A material requirements for well control equipment

1. Stress concentration cracking at bolt holes due to improper torque application; 2. Corrosion pitting from exposure to H2S/CO2-containing drilling fluids (sour service environments); 3. Deformation from excessive pressure spikes during well kick events

1. Torque all bonnet bolts to Shenkai’s specified values (per OE manual) using calibrated torque wrenches; retorque after the first 10 BOP actuations. 2. For sour service applications, implement corrosion inhibitor treatments 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.

2

Piston

H09.02

High-strength carbon steel (A36) with hard chrome plating for wear resistance; piston seals integrated with nitrile rubber (NBR) O-rings

1. Wear on piston outer diameter (O.D.) due to friction against the BOP housing; 2. Plating flaking from hydraulic fluid contamination (e.g., abrasive particles); 3. Hydraulic fluid leakage due to damaged integrated seals

1. Maintain hydraulic fluid cleanliness per ISO 4406 Class 18/15/12 standards; install high-efficiency filters in the hydraulic system. 2. Lubricate piston O.D. with molybdenum disulfide (moly) grease compatible with NBR seals before assembly. 3. Inspect piston O.D. for wear or plating damage during each BOP maintenance cycle; replace if wear exceeds 0.5mm or plating flaking is detected.

1

Packer

H09.07.00

Hydrogenated nitrile rubber (HNBR) with polyester fiber reinforcement; compatible with both oil-based and water-based drilling fluids; temperature rating: -40°C to 150°C

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 0.3mm. 2. For wellbores with temperatures above 150°C, upgrade to fluoroelastomer (FKM) packers (consult Shenkai for compatible alternatives). 3. Use high-efficiency shale shakers and desanders to reduce solid content in drilling fluid; clean the BOP cavity before packer installation.

2

Seal-Adapter Ring (I.D.) (1)

H09.08.00

Nitrile rubber (NBR) with a rigid steel insert for dimensional stability; shore hardness: 70±5 A

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.)

H09.09

Nitrile rubber (NBR) conforming to ASTM D2000 standard; resistant to petroleum-based fluids

1. Pinching or cutting from sharp edges on mating metal components; 2. Swelling and softening from exposure to oil-based mud (OBM) additives; 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. Ensure OBM additives (e.g., surfactants, corrosion inhibitors) are compatible with NBR; test sample O-rings in drilling fluid prior to use. 3. Store O-rings in a cool, dark, and dry environment; use ozone-resistant storage bags to prevent atmospheric degradation.

4

Adapter Ring

H09.03

Fluoroelastomer (FKM) with stainless steel 316L reinforcement; chemical resistance to acids, bases, and aggressive drilling fluid additives

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 in deep wells

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 (e.g., when tripping pipe in/out of high-temperature zones); allow the adapter ring to acclimate to temperature changes.

5

Seal-Shell

H09.12.01

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

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

H09.12.02

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)

H09.01

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

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)

H09.11.01

Fluoroelastomer (FKM) with brass insert; chemical resistance to sour gas and aggressive drilling fluids

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), use NACE MR0175/ISO 15156-compliant brass inserts. 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

O ring

H09.11.02

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

1. High-cost premature replacement due to improper storage (FFKM is sensitive to moisture); 2. Installation damage from sharp metal edges; 3. Compression set from long-term static load

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

10

Seal-Piston O.D.

H09.15.01

Polyurethane (PU) with high abrasion resistance; integrated NBR backup rings

1. Abrasive wear from contact with the BOP housing; 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

H09.15.02

Nitrile rubber (NBR) with carbon black reinforcement; enhanced wear resistance for dynamic applications

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.

1

Wear ring-piston O.D.

H09.14

Polytetrafluoroethylene (PTFE) with glass fiber reinforcement; low friction coefficient (μ < 0.1)

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 piston 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 piston pressure does not exceed Shenkai’s rated limits; use pressure transducers to monitor pressure in real time.

2

Wear Ring- Shell

H09.13

Nylon 66 with molybdenum disulfide (MoS2) additive; self-lubricating and high impact resistance

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

1. Handle wear rings with care during assembly and transportation; avoid dropping or impacting. 2. Inspect the seal-shell surface for smoothness; replace the seal-shell 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.