1. Core Purpose & Application Overview
This documentation covers Bomco single gear box drawworks series—JC30DB, JC40DB, JC50DB, JC70DB, JC90DB, JC120DB—tailored for oilfield drilling contractors and well construction teams. It addresses high-load wear and operational inefficiency pain points, delivering reliable performance for onshore/offshore drilling. Ideal for 30~120 ton-class operations, it complies with API 7K standards, ensuring safe torque transmission and load handling.
2. Technical Parameters Classification
2.1 Model & Power Performance Parameters
These parameters define the core power capacity of each drawworks model, solving insufficient input power and load mismatches that cause gearbox failure. Critical for heavy-duty drilling, they ensure compatibility with drill string weights, adhering to API 7K load rating standards.
No. | Parameter | JC30DB | JC40DB | JC50DB | JC70DB | JC90DB | JC120DB | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Model | JC30DB | JC40DB | JC50DB | JC70DB | JC90DB | JC120DB | Bomco custom single gear box design (API 7K) | N/A (model-specific, non-wear component) | Verify model matches drilling load requirements; store gearbox in dry, temperature-controlled environment. |
2 | Rated Input Power (kW) | 600 | 800 | 1100 | 1470 | 3200 | 4400 | Alloy steel gear train (42CrMo) | 1. Overloading beyond rated power; 2. Gear wear from insufficient lubrication. | 1. Strictly avoid power overload; 2. Use API 5GL lubricating oil and change every 1500 operating hours. |
3 | Max. Pulling of Fast-line (kN) | 210 | 280 | 350 | 450 | 640 | 851 | High-strength steel fast-line assembly | 1. Shock loads during hoisting; 2. Fatigue from repeated load cycles. | 1. Avoid sudden load changes; 2. Inspect fast-line for fatigue cracks weekly per API 9A. |
2.2 Wire Rope & Drum Specifications
These parameters ensure wire rope and drum compatibility, resolving wear and slippage issues that halt drilling. Optimized for different load classes, they guarantee stable drill string hoisting, with drum designs adhering to API 8C standards for durability.
No. | Parameter | JC30DB | JC40DB | JC50DB | JC70DB | JC90DB | JC120DB | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Diameter of Wire Rope (mm) | 29 | 32 | 35 | 38 | 45 | 48 | Galvanized steel wire rope (API 9A) | 1. Abrasion from drum grooves; 2. Corrosion from wellsite moisture. | 1. Align rope with drum grooves; 2. Apply anti-corrosion grease and inspect for broken strands daily. |
2 | Drum Size (D x W, mm) | 560×1000 | 644×1208 | 770×1310 | 770×1434 | 1060×1840 | 1320×2312 | Hard chrome-plated carbon steel drum | 1. Groove wear from rope friction; 2. Deformation from uneven loading. | 1. Monitor groove depth monthly; 2. Ensure uniform rope winding to avoid uneven stress. |
2.3 Auxiliary Brake & Physical Parameters
Key for operational safety and on-site adaptability, these parameters solve brake failure and space constraint issues. Auxiliary brakes comply with API 7K, while dimensions and weight ensure compatibility with standard drilling rig layouts.
No. | Parameter | JC30DB | JC40DB | JC50DB | JC70DB | JC90DB | JC120DB | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Auxiliary Brake | Regenerating brake | DWS40 | Regenerating brake | Regenerating brake | Regenerating brake | Regenerating brake | Hydraulic brake system (API 7K) | 1. Brake pad wear from frequent use; 2. Hydraulic fluid contamination. | 1. Replace brake pads when thickness <5mm; 2. Filter hydraulic fluid every 500 hours. |
2 | Overall Dimensions (L×W×H, mm) | 4700×2800×2552 | 7000×3695×3010 | 6530×3192×2680 | 7920×3050×2680 | 10000×3350×3035 | 12000×3350×3260 | Welded carbon steel frame (Q355B) | 1. Corrosion from wellsite chemicals; 2. Impact damage during transportation. | 1. Apply anti-corrosion coating annually; 2. Use shock-absorbing pads during transport. |
3 | Weight (kg) | 19600 | 39125 | 36000 | 46500 | 76300 | 111000 | High-strength steel components | 1. Structural fatigue from uneven weight distribution; 2. Fastener loosening from vibration. | 1. Ensure level installation; 2. Retorque fasteners every 300 hours per API RP 7G. |
3. On-Site Fault Repair Case
Case: JC70DB Drawworks Gearbox Wear Due to Lubrication Neglect
Scenario: During 800m drilling, the JC70DB’s gearbox emitted abnormal noise and overheated. Root Cause: Failed to change lubricating oil per schedule, causing gear wear (violating API 5GL standards). Repair: Replaced 42CrMo gears, flushed the gearbox, and refilled with API 5GL oil. Prevention: Set oil change reminders and test oil viscosity monthly.
4. FAQ
Question | Answer |
How to select the right wire rope for Bomco JC series drawworks? | Match rope diameter to each model’s specification (29~48mm) and use API 9A galvanized steel rope. Ensure breaking strength exceeds 5x max. fast-line pull to avoid overload failure. |
What maintenance is required for the regenerating auxiliary brake? | Inspect brake pads weekly, replace hydraulic fluid every 500 hours (use ISO VG 46 oil), and clean brake cooling systems to prevent overheating. Comply with API 7K brake maintenance protocols. |
5. Procurement Guidance & Call to Action
Bomco single gear box drawworks (JC30DB to JC120DB) are API 7K-compliant solutions for 30~120 ton-class drilling operations. They resolve high-load wear and operational inefficiency, with tailored power and load capacities for onshore/offshore needs. Each component meets strict material standards, ensuring durability and safety.
We provide genuine Bomco parts, detailed compatibility guides, and technical support to optimize your drilling operations. Our team offers pre-purchase model selection advice and on-site maintenance training, ensuring you get the right drawworks for your project requirements.
Choose Bomco JC series drawworks for reliable, high-performance drilling. Contact us today to discuss your project’s load, power, and space needs. We will tailor a solution to maximize your operational uptime and comply with global oilfield standards.
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