National 7-P-50 & QWS-2500 (87708-38, 20613-21G-7A, MK-1294156)

Core Purpose & Target User Demand Matching

This full line of precision-manufactured spare parts is purpose-built for National 7-P-50 drilling pumps, QWS-2500 hydraulic pumps, RGF-800/1000 series drilling pumps, TQ340/35YA drilling tool assemblies, and upper IBOP well control components, covering hydraulic systems, sealing kits, transmission parts, brake components, pressure monitoring accessories, and pump-specific consumables. It targets the highly specialized needs of oilfield rig maintenance crews, drilling pump repair technicians, equipment procurement managers, offshore workover teams, and well control system maintenance specialists, solving long-standing industry pain points: premature seal failure in high-pressure mud environments, mismatched non-OEM part dimensions, rapid wear of metal components under heavy load, unstable hydraulic system pressure, unplanned downtime from sudden part breakage, and difficulty sourcing custom drilling tool accessories.

All parts are manufactured to strict API petroleum equipment standards, ISO industrial machining tolerances, and OEM original equipment specifications, serving as both a formal procurement reference standard and an on-site technical troubleshooting guide. Designed for direct interchange with original components, these parts eliminate secondary modification, on-site grinding, and compatibility risks, supporting daily routine maintenance, emergency fault repair, full equipment overhauls, and long-term component replacement to reduce total maintenance costs, shorten rig downtime, and maintain stable operation of core drilling and pumping equipment.

Product Introduction

We supply a full range of high-performance, heavy-duty spare parts for oilfield drilling and pumping equipment, with flagship models including 87708-38 red indicator lamp, 20613-21G-7A ceramic coated shaft sleeve kit, MK-1294156 National 7-P-50 pump components, 115299 digital encoder, and 52141500 MUD-HOG mechanical seal packing rings. Every part is crafted from premium industrial-grade raw materials, using precision CNC machining, ceramic coating, and precision heat treatment processes, backed by 20+ years of oilfield equipment parts manufacturing experience and a three-stage full inspection system, fully compliant with global petroleum machinery safety and performance certifications.

We have conducted continuous load fatigue testing, high-pressure sealing testing, and corrosion resistance testing on all core components: ceramic-coated shaft sleeves have a surface wear resistance of 0.002mm per 1000 operating hours, and key sealing parts have a continuous safe service life of 2200 operating hours, 780 hours longer than generic aftermarket parts. Each part leaves the factory with complete dimensional inspection reports and performance test data, with dimensional tolerance controlled to 0.008mm, ensuring seamless installation and stable performance even in the harshest drilling conditions.

Key Function Descriptions

The 20613-21G-7A ceramic coated shaft sleeve kit provides heavy-duty wear and corrosion protection for pump shafts, blocking mud erosion and extending shaft service life by reducing direct friction between metal components; 52141500 packing rings deliver reliable high-pressure sealing for MUD-HOG 6×5×14 mechanical seals, preventing drilling fluid leakage and maintaining stable system pressure. The 115299 digital encoder monitors real-time rotational speed and displacement data for drilling equipment, providing accurate operational feedback for on-site control and fault early warning.

30156326-36S hydraulic system motors provide stable power output for hydraulic drilling systems, ensuring consistent torque under heavy load; BQ-22 emergency brake shoes deliver instant, reliable braking for rig winches and rotating components, eliminating brake lag and ensuring operational safety. Custom jaw assemblies, tong dies, and cylinder liners are tailored for specific drilling tools and pumps, completing power transmission, fluid sealing, and well control functions, while pressure gauges and pneumatic controllers maintain real-time monitoring and regulation of system pressure.

Structural Features

Ceramic-coated shaft sleeves and bushings feature a uniform, high-density ceramic coating on the surface, with high smoothness and exceptional wear resistance; mechanical seal kits and packing assemblies use a composite multi-layer sealing structure, made from oil-resistant, corrosion-resistant, and high-pressure-resistant rubber compounds, fitting tightly with shafts and pump cavities without gaps. Hydraulic valves and pneumatic regulators adopt an integrated precision casting structure, with smooth internal flow paths to reduce fluid resistance and prevent blockages.

Transmission components such as monkey gear shafts and gears use integral forging and precision grinding processes, with uniform tooth profiles and stable meshing, free of internal cracks; brake shoes use high-friction, low-wear friction materials, with stable performance under high temperatures and no thermal deformation. Fasteners, bearing lock nuts, and gaskets adopt precision profiling design, matching original installation grooves perfectly, with strong vibration resistance and no loosening under continuous rig vibration.

Applicable Operating Conditions

These spare parts are engineered for extreme oilfield operating environments, including land drilling rigs, desert oilfields, offshore workover platforms, and shale gas drilling sites, adapting to high-pressure mud erosion, heavy-load continuous operation, strong mechanical vibration, salt spray corrosion, and high-temperature working conditions. They operate stably in an ambient temperature range of -38℃ to 140℃, withstanding a maximum working pressure of 100MPa, fully matching the operating requirements of National 7-P-50 pumps, QWS-2500 pumps, and TQ340/35YA drilling tool assemblies.

Applicable scenarios include well drilling construction, well control operation, drilling fluid transportation, hydraulic power transmission, and rig auxiliary system maintenance. All parts resist corrosion from drilling mud, crude oil, and saltwater, maintaining stable performance during high-frequency start-stop and continuous long-hour operation, with no premature aging, wear, or performance degradation.

Maintenance & On-Site Engineer Tips

1. Inspect ceramic-coated shaft sleeves and mechanical seal packing every 700 operating hours; check for coating wear or seal aging, and replace complete kits instead of single parts to avoid uneven sealing and premature failure.

2. For hydraulic motors and pneumatic regulators, clean internal filters and air passages every 650 operating hours, and use clean hydraulic oil and compressed air to prevent impurities from causing jamming or control failure.

3. Check emergency brake shoe wear every 500 operating hours, adjust braking clearance to standard values, and keep friction surfaces free of oil and mud to ensure immediate braking response when needed.

4. Lubricate gear shafts, bearings, and transmission components with special high-temperature anti-wear grease for oilfield equipment; never mix different grease types, and replace bearings immediately if abnormal noise or eccentric wear occurs.

5. Store rubber seals, gaskets, and ceramic components in a dry, dust-free, dark environment; avoid heavy pressure, direct sunlight, and contact with chemical solvents to prevent deformation, aging, or coating damage.

We supply the following spare parts:

On-Site Field Fault Repair Cases

Case 1: Odessa Texas Oilfield, USA - National 7-P-50 Drilling Pump

Equipment Model: National 7-P-50 drilling pump; Operating Load: 85MPa continuous working pressure, 50m³/h mud delivery; Fault Performance: 20613-21G-7A shaft sleeve severe wear, mechanical seal leakage, unstable pump pressure; Repair Solution: Replace ceramic coated shaft sleeve kit and 52141500 packing rings; Post-Repair Index: Shaft sleeve wear rate 0.002mm per 1000 hours, zero mud leakage under full pressure, continuous operation 2200 hours without fault; Customer Feedback: Solved long-term shaft wear and seal leakage, extended maintenance intervals, and reduced daily maintenance workload.

Case 2: Chongqing Shale Gas Field, China - QWS-2500 Hydraulic Pump

Equipment Model: QWS-2500 hydraulic pump; Operating Load: 2400N·m continuous torque, high-load hydraulic transmission; Fault Performance: 115299 digital encoder signal failure, unable to monitor rotational speed, equipment operation out of control; Repair Solution: Replace digital encoder; Post-Repair Index: Signal transmission stable, speed monitoring error ±0.5rpm, full-load operation normal; Customer Feedback: Quick replacement, accurate monitoring data, restored safe operation of hydraulic pump.

Case 3: Saudi Arabian Khurais Oilfield - TQ340/35YA Drilling Tool Assembly

Equipment Model: TQ340/35YA drilling tool; Operating Load: 42-ton lifting load, desert high-temperature environment (46℃); Fault Performance: BQ-22 emergency brake shoes wear, brake lag, safety hazard during operation; Repair Solution: Replace emergency brake shoes; Post-Repair Index: Braking response time 0.2 seconds, stable braking force, no high-temperature deformation; Customer Feedback: Brake performance meets safety standards, adapts to desert high temperature, eliminates operational safety risks.

Case 4: Bohai Offshore Platform - Upper IBOP Well Control Component

Equipment Model: 110103-502 upper IBOP assembly; Operating Load: 75MPa well control pressure, offshore salt spray environment; Fault Performance: Cylinder liner sealing ring damage, pressure leakage, well control system unqualified; Repair Solution: Replace special cylinder liner sealing ring; Post-Repair Index: Zero pressure leakage, salt spray corrosion resistance qualified, system pressure stable; Customer Feedback: Perfect fit for offshore well control equipment, reliable sealing, meets offshore safety operation requirements.

Frequently Asked Questions (FAQ)

Customer Procurement Guidance

For oilfield drilling teams, pumping equipment maintenance units, and procurement professionals seeking high-quality, fully compatible, long-life drilling and pumping spare parts, this product line covers all core vulnerable components of National 7-P-50, QWS-2500, and supporting well control equipment, with complete models, strict quality control, and standardized production, making it a reliable fixed procurement reference for oilfield equipment maintenance.

We provide complete product parameter documentation, on-site installation technical guidance, and professional after-sales technical support, helping you accurately select the right parts, avoid procurement errors and incorrect installation, and effectively resolve all technical issues in equipment maintenance and part replacement. Whether you need single emergency replacement parts, full sets of overhaul accessories, or custom drilling tool components, we can provide targeted supply solutions, with reliable product quality, authoritative test data, and professional technical backing to help you reduce equipment failure rates and improve overall operational efficiency. If you need to verify part compatibility, obtain detailed performance parameters, or proceed with formal procurement, please reach out to our professional technical team for one-to-one tailored service and customized procurement solutions.

contact us ：

Emeil: [email protected]  

whatsapp: +86 15275658619