NOV Shaffer Repair Kit P/N: 20081966

National Oilwell Varco (NOV) Shaffer Repair Kit — P/N: 20081966

The National Oilwell Varco (NOV) Shaffer Repair Kit (Part Number: 20081966) is an OEM pressure-control elastomer and seal overhaul kit engineered for severe-duty maintenance on Shaffer Blowout Preventer (BOP) systems. Designed for subsea and surface well-control stacks, this kit replaces high-wear hydraulic operator seals, ram shaft packing, door seals, and dynamic internal O-rings to prevent hydraulic fluid bypass and maintain pressure containment.

Technical Specifications

Compatible Equipment Models

• Shaffer Ram-Type BOPs: SL-Series, SLX-Series, NXT, LWS, and Chasovoy Models
• Bore Sizes & Working Pressures: 7-1/16″, 11″, 13-5/8″, 18-3/4″, and 21-1/4″ (5,000 PSI, 10,000 PSI, and 15,000 PSI assemblies)
• Operator Types: Standard Hydraulic Cylinders, Poslock Automatic Locking Actuators, and Multi-Ram Operators

Part Number Cross-References

• NOV / Shaffer OEM MPN: 20081966
• Interchangeable / Superseded Part Numbers: 20081966-KIT, NOV-20081966, SH-20081966, 1102934-20081966

Key Features

1. Anti-Extrusion Engineering: Includes high-modulus phenolic and PTFE backup rings engineered to eliminate seal gap extrusion under rapid 15,000 PSI pressure differentials.
2. Severe Sour-Gas Trim: Formulated for harsh offshore environments, meeting stringent NACE MR0175 criteria for sour gas and drilling mud additives.
3. Low-Friction Dynamic Profiles: Molybdenum disulfide and PTFE-impregnated lip seals lower hydraulic breakout friction and reduce cylinder scoring.
4. Dual Sealing Redundancy: Features precise geometry for both primary hydraulic shaft lip seals and emergency secondary plastic packing injection systems.
5. Full Thermal Stability: Operational across standard API 16A continuous temperature classifications from -18°C to +121°C (0°F to +250°F).

Applications

• Subsea and surface BOP stack major overhauls (between-well service and API Standard 53 5-year recertification).
• Offshore drilling units (Drillships, Semi-submersibles, and Jack-up rigs).
• High-pressure, high-temperature (HPHT) deepwater exploration wells.
• Workover, snubbing, and coiled tubing well-intervention pressure-control operations.

Frequently Asked Questions

What components are included in the NOV Shaffer 20081966 Repair Kit?

The kit includes primary ram shaft lip seals, hydraulic piston dynamic seals, bonnet door seal O-rings, secondary packing energizers, PTFE backup rings, wear bands, and rod wipers required to perform a complete hydraulic operator and bonnet overhaul.

Does this kit meet API Standard 53 requirements for well-control maintenance?

Yes. All components comply with API Spec 16A and API Standard 53 guidelines for blowout prevention equipment repair and re-certification.

Can this seal kit be utilized in high-concentration H2S and CO2 environments?

Yes. The elastomeric compounds meet NACE MR0175/ISO 15156 standards, preventing elastomer hardening, blistering, and explosive decompression in sour-gas operating conditions.

How should spare NOV 20081966 kits be stored on the rig?

Keep kits in their original UV-shielded, vacuum-sealed packaging. Store in a dark, dry, climate-controlled environment between 10°C and 25°C (50°F to 77°F), away from direct sunlight, ozone sources, and electric motors.