Core Purpose Description
This document focuses on the water pipe assembly and hydrosphere control units parts of BOMCO drawworks series, including JC-90, JC-70, JC-50, JC-40 and their DB/D variants. These parts are exclusively compatible with the aforementioned BOMCO drawworks models, tailored for oilfield drilling enterprises, professional drilling rig maintenance service providers, and oilfield equipment rental companies. They address pain points such as overheating of key components (drum shaft, bearings), water leakage, and hydraulic control failure caused by harsh oilfield working conditions (high temperature, dust, vibration) and long-term high-load operation. All parts comply with API Spec 7K "Drilling and Well Servicing Equipment" and GB/T 23505-2009 "Drilling Rig Drawworks" standards, ensuring efficient cooling of drawworks key parts and reliable operation of the hydrosphere control system, providing authoritative technical support for the safe and stable operation of the equipment.
1. Water Pipe Assembly Core Components
This category includes steel pipes, joints, elbows, and pipe clip assemblies that form the cooling water transmission channel of the drawworks. They solve pain points of water leakage, pipeline blockage, and cooling inefficiency caused by pipeline aging, joint loosening, and vibration. Suitable for maintenance and replacement of BOMCO multi-model drawworks water pipe systems.
No. | Product Name | Model/ Drawing No. | Material | Main Wear Causes | Damage Prevention Precautions |
1 | Steel Pipes & Piping | Steel pipe L=1862 (AF700303-020103), Steel pipe L=1860 (AF700303-021901), Steel pipe (AF70030302190001/0002/0003/AF700S0S02190004), Piping 42 (520901020720890897) | 20# carbon steel (seamless rolling + pickling passivation); Surface: Anti-corrosion painting; Wall thickness: Precision controlled | 1. Pipe wall corrosion and thinning caused by long-term contact with cooling water (containing impurities); 2. Deformation and welding seam cracking caused by vibration and impact during operation | 1. Regularly clean the pipeline to remove scale and impurities, and check the pipe wall thickness every 6 months (allowable reduction ≤ 10%); 2. Fix the pipeline with anti-vibration pipe clips, and conduct non-destructive testing (NDT) on welding seams every 12 months |
2 | Joints | Joint Rc 3/4 (AF700303-020101), Joint R3/4-M52X2 (AF700303-02190200), Joint R1 1/4-M52X2 (520901140521020100), Inner joint R1 1/4 (520502070400320000) | 304 stainless steel (threaded joints) / 20# carbon steel (welding joints); Thread: Precision rolling; Sealing surface: Polishing | 1. Thread wear and water leakage caused by repeated disassembly and assembly; 2. Corrosion of the joint body caused by humid environment and water quality impurities | 1. Apply thread sealant (PTFE-based) during installation of threaded joints, and tighten with a torque wrench; 2. Install a filter at the water inlet to reduce impurity erosion, and check the joint tightness every 7 days |
3 | Elbows | Elbow 45°Rc1-1/4 (520207010320000002), Elbow Rc1 1/4 (520502070400320002) | 304 stainless steel; Bend: Precision forging; Inner wall: Smooth polishing | 1. Wall thickness reduction at the bend caused by long-term water flow scouring; 2. Joint leakage caused by seal ring aging | 1. Avoid excessive water pressure (maintain within 0.3-0.5MPa) to reduce scouring; 2. Replace the matching seal ring every 6 months, and check the bend wall thickness regularly |
4 | Pipe Clip Assemblies & Connector Lug | Pipe clip assembly (AF70027-03020200), Connector lug (AF700303-020102) | Pipe Clip Body: Q235B carbon steel (galvanizing); Rubber Pad: Nitrile rubber (anti-vibration); Connector Lug: 304 stainless steel | 1. Rubber pad aging and loss of anti-vibration performance caused by high temperature; 2. Pipe clip deformation caused by excessive clamping force | 1. Replace the rubber pad every 12 months, and avoid direct contact with high-temperature components; 2. Control the clamping torque during installation to prevent pipeline damage, and check the fixing status regularly |
5 | Nut M52X2 | 520901020830360367 | 45# carbon steel (heat treatment + galvanizing); Thread: Precision rolling | 1. Thread loosening caused by equipment vibration; 2. Corrosion caused by humid environment and water splashing | 1. Use spring washers and thread lock glue to enhance anti-loosening performance; 2. Clean the thread regularly and apply anti-rust oil, and install a protective cover if necessary |
2. Hydrosphere Control Units Core Components
This category includes mandrels, bearing caps, springs, and oil seals that form the core control structure of the hydrosphere system. They solve pain points of control failure, oil leakage, and component wear caused by dust intrusion, lubrication insufficiency, and alternating load. Suitable for maintenance of BOMCO multi-model drawworks hydrosphere control systems.
No. | Product Name | Model/ Drawing No. | Material | Main Wear Causes | Damage Prevention Precautions |
1 | Mandrel & Shaft Sleeve | Mandrel (AF0000030101), Shaft sleeve (AF700201-01042002) | Mandrel: 42CrMo alloy steel (integral forging + quenched and tempered treatment); Shaft Sleeve: 40Cr alloy steel (surface quenching); Surface: Precision grinding | 1. Surface wear caused by long-term sliding friction; 2. Deformation caused by uneven load and impact | 1. Apply molybdenum disulfide lubricant to reduce friction, and check the wear (allowable wear ≤ 0.1mm) every 3 months; 2. Ensure the assembly coaxiality (allowable deviation ≤ 0.02mm), and avoid overload operation |
2 | Bearing Cap & Cover | Bearing cap (AF700201-010A-2003), Cover (AF700301-021402) | HT250 gray cast iron (normalized); Sealing Groove: Precision machining; Fastening Holes: Thread rolling | 1. Sealing failure caused by wear of the sealing groove and aging of the seal; 2. Cap deformation caused by uneven fastening force | 1. Replace the matching seal every 12 months, and check the sealing groove wear regularly; 2. Tighten the fixing bolts evenly with a torque wrench, and apply thread lock glue |
3 | Spring & Spring Base | Pul-out piece spring (AF700201-01042010), Spring base (AF700201-01042005) | Spring: 65Mn steel (heat treatment + shot peening); Spring Base: 45# carbon steel (quenched and tempered) | 1. Spring fatigue and deformation caused by long-term repeated compression; 2. Spring base wear caused by contact friction with the spring | 1. Check the spring elastic force every 6 months, and replace if the deformation exceeds 5%; 2. Apply a thin layer of lubricating grease between the spring and the base to reduce friction |
4 | Oil Seal | PD100X130X12 (AF700201-01042009) | Sealing Lip: Nitrile rubber (oil-resistant + water-resistant); Skeleton: 08F carbon steel; Spring: 65Mn steel; Comply with HG4-692 standard | 1. Sealing lip wear caused by long-term friction with the rotating component; 2. Skeleton corrosion caused by humid environment and oil-water mixing | 1. Check the surface of the matching rotating component (Ra ≤ 0.8μm) before installation, avoid sharp edges; 2. Apply lubricating grease on the sealing lip, and replace the oil seal every 12 months |
5 | Spill Cup & Oil Cup | Spill cup (T007-001.00), Oil cup M10X1 (61302011152101000) | Spill Cup: HT200 gray cast iron (anti-corrosion painting); Oil Cup: 304 stainless steel (body) + engineering plastic (cover) | 1. Spill cup corrosion caused by long-term contact with oil and water; 2. Oil cup blockage caused by lubricating grease solidification and dust intrusion | 1. Clean the spill cup regularly and repaint anti-corrosion paint every 12 months; 2. Clean the oil cup mouth every 15 days, add lubricating grease regularly, and tighten the cover after adding |
6 | Bearing 6218 | 430107000621800000 | Inner/Outer Ring & Rolling Elements: GCr15 bearing steel (quenched and tempered); Cage: Brass; Sealing Ring: Nitrile rubber | 1. Rolling element wear and cage damage caused by insufficient lubrication and dust intrusion; 2. Bearing overheating caused by misalignment and high-speed operation | 1. Add high-quality lubricating grease (NLGI 2) every 500 operating hours, and install a dust cover; 2. Align the bearing with a laser alignment instrument (alignment accuracy ≤ 0.01mm), and monitor the temperature (allowable temperature ≤ 75℃) |
3. Universal Connecting, Fastening & Sealing Components
This category includes bolts, screws, nuts, washers, and O-rings that provide reliable connection, fastening, and sealing functions for both water pipe assemblies and hydrosphere control units. They solve pain points of component loosening, water/oil leakage, and dust intrusion caused by vibration and harsh environment. Suitable for overall maintenance of BOMCO multi-model drawworks related systems.
No. | Product Name | Model/ Part No. | Material | Main Wear Causes | Damage Prevention Precautions |
1 | Bolts & Screws | Blot M10X35 (420201010710035060), Screw M6X15 (420101030706001660) | M10: 40Cr alloy steel (heat treatment); M6: 35# carbon steel (heat treatment); Thread: Precision rolling; Surface: Galvanizing | 1. Thread wear caused by repeated disassembly and assembly; 2. Fatigue and fracture caused by long-term vibration | 1. Apply anti-rust lubricating oil on the thread during installation, and use a torque wrench to control the tightening force (M10: 35-40N·m; M6: 8-10N·m); 2. Check the tightness every 7 days, and replace parts with fatigue signs |
2 | Nuts & Round Nut | Round nut M85X2 (420414011085214000) | 45# carbon steel (heat treatment); Surface: Galvanizing; Thread: Precision rolling | 1. Thread loosening caused by strong vibration; 2. Corrosion caused by humid environment and oil-water erosion | 1. Use matching washers and thread lock glue to enhance anti-loosening performance; 2. Clean the thread regularly and apply anti-rust oil, and check the tightness regularly |
3 | Washers | Washer 85 (420506016085080000), Spring washer 10 (420503016101600000) | Washer 85: Q235B carbon steel (galvanizing); Spring washer 10: 65Mn steel (heat treatment + phosphating) | 1. Spring washer fatigue and loss of elasticity caused by long-term compression; 2. Washer corrosion caused by humid environment | 1. Replace spring washers every 6 months, and check elasticity regularly; 2. Store spare parts in a dry environment, and apply anti-rust oil after disassembly |
4 | O-rings | O-ring 90X5.3 (530301010900053000/530301010900053001), O-ring 40X3.1 (530301190400031001) | Nitrile rubber (NBR); Hardness: 70±5 Shore A; Comply with HG/T 2579-2008 standard; Oil-resistant & water-resistant | 1. Aging, cracking and hardening caused by high temperature and oil-water erosion; 2. Damage caused by improper installation (scratching by sharp edges) | 1. Control the operating temperature ≤ 80℃, and avoid contact with corrosive media; 2. Remove sharp edges at the installation position, apply lubricating grease on the O-ring before installation, and replace every 12 months |
5 | Seal & Shim | Seal (AF700201-01042006), Shim (AF700201-01042007/AF700201-01042011) | Seal: Nitrile rubber (oil-water resistant); Shim: Q235B carbon steel (galvanizing); Thickness: Precision stamping | 1. Seal aging and leakage caused by long-term compression and oil-water erosion; 2. Shim deformation caused by uneven pressure | 1. Replace the seal every 12 months, and check the compression amount regularly; 2. Select shims of appropriate thickness during assembly to ensure uniform pressure distribution, and replace deformed shims in time |
Field Fault Maintenance Case
Case: BOMCO JC-90DB Drawworks Water Pipe Assembly Leakage & Hydrosphere Control Failure - During on-site drilling operation, water leakage was found at the joint of the water pipe assembly of the JC-90DB drawworks, and the hydrosphere control unit failed to work normally, leading to overheating of the drum shaft bearing (temperature up to 98℃). Inspection found that the O-ring at the water pipe joint was aging and cracked, the thread of the M52X2 nut was loose, and the oil seal of the hydrosphere control unit was damaged, resulting in oil-water mixing and bearing jamming. Root cause: Long-term vibration caused the nut to loosen and the O-ring to wear; the oil seal was not replaced in time, leading to sealing failure and oil-water mixing.
Complete Solution: 1. Safety Preparation Stage: a) Immediately stop the drawworks and cooling water system operation, cut off the power supply of the related equipment, lock the power switch, and hang a "No Operation Under Maintenance" warning sign around the maintenance area to prevent misoperation; b) Wait for the drum shaft bearing to cool down naturally to below 45℃ (prohibit forced cooling with cold water to avoid thermal deformation of the bearing and shaft); c) Maintenance personnel wear professional protective equipment (anti-skid safety shoes, goggles, waterproof gloves) to prevent slipping, splashing and mechanical injury; d) Prepare special tools (torque wrench, pipe wrench, bearing puller, surface roughness meter), cleaning materials (anhydrous ethanol, industrial degreaser, high-pressure cleaning gun), and replacement parts (matching O-rings: O-ring 90X5.3/40X3.1, new PD100X130X12 oil seal, M52X2 nut, spring washers, PTFE thread sealant, high-temperature resistant lubricating grease NLGI 2) in place. 2. Fault Point Confirmation & Preliminary Treatment: a) Use a water flow meter to detect the leakage rate of the water pipe joint, and mark the leakage position (focus on the R3/4-M52X2 joint and M52X2 nut connection); b) Use an infrared thermometer to reconfirm the drum shaft bearing temperature (98℃, exceeding the allowable limit of 75℃), and check whether there is abnormal noise or jamming in the hydrosphere control unit by hand cranking; c) Close the cooling water inlet valve of the water pipe assembly, drain the residual water in the pipeline through the drain valve, and wipe the surface of the pipeline and hydrosphere control unit with a dry cloth to avoid water splashing during disassembly. 3. Disassembly of Faulty Components: a) Water Pipe Assembly Disassembly: i) Use a pipe wrench to loosen the loose M52X2 nut at the water pipe joint, and remove the nut and matching spring washer; ii) Pull out the joint to take out the aging and cracked O-ring, and check the joint inner wall and sealing groove for wear (no obvious wear found in this case); iii) Remove the pipe clip assembly near the leakage joint, and temporarily fix the pipeline with a lifting rope to avoid pipeline deformation. b) Hydrosphere Control Unit Disassembly: i) Use a torque wrench to symmetrically loosen the fastening bolts of the hydrosphere control unit cover, and take down the cover; ii) Check the internal components, take out the damaged PD100X130X12 oil seal from the sealing groove, and find oil-water mixture and a small amount of emulsified grease in the inner cavity; iii) Use a bearing puller to take out the 6218 bearing in the hydrosphere control unit, and check that the bearing rolling elements have slight jamming and rust spots due to oil-water mixing. 4. Comprehensive Cleaning & Inspection: a) Water Pipe System Cleaning: i) Use a high-pressure cleaning gun (air pressure 0.4-0.6MPa) to flush the water pipe inner cavity with clean water to remove scale and impurities; ii) Use industrial degreaser to clean the joint sealing surface and nut thread, then wipe with anhydrous ethanol and dry with compressed air; iii) Check the pipe wall thickness with a thickness gauge (allowable reduction ≤ 10%), and confirm the pipeline is intact without deformation. b) Hydrosphere Control Unit Cleaning: i) Drain the oil-water mixture in the inner cavity, use industrial degreaser to thoroughly clean the inner cavity, mandrel, shaft sleeve and bearing seat; ii) Clean the 6218 bearing with diesel oil, check the rolling element flexibility and raceway wear (no obvious wear, only slight rust spots), and dry it with compressed air; iii) Check the sealing groove of the control unit cover with a feeler gauge (allowable wear ≤ 0.1mm), and polish the burrs with fine sandpaper if any; iv) Check the mandrel surface roughness with a surface roughness meter (ensure Ra ≤ 0.8μm) to avoid scratching the new oil seal. 5. Component Replacement & Assembly: a) Water Pipe Assembly Assembly: i) Select a new matching O-ring (O-ring 90X5.3/40X3.1 according to the joint size), apply a thin layer of lubricating grease on the O-ring surface, and install it into the joint sealing groove (ensure no distortion or deviation); ii) Install a new spring washer on the joint, align the joint with the pipeline interface, and screw on the new M52X2 nut by hand; iii) Apply PTFE thread sealant on the nut thread, and tighten the nut with a torque wrench according to the specified torque (80-85N·m); iv) Reinstall the pipe clip assembly, adjust the rubber pad position to ensure it is closely attached to the pipeline, and tighten the pipe clip bolts (tightening torque 15-20N·m) to avoid pipeline vibration. b) Hydrosphere Control Unit Assembly: i) Apply lubricating grease on the sealing lip of the new PD100X130X12 oil seal, use a special press tool to evenly press the oil seal into the sealing groove (avoid knocking to prevent oil seal deformation); ii) Apply high-temperature resistant lubricating grease (NLGI 2) on the 6218 bearing inner ring and rolling elements, and install the bearing into the bearing seat; iii) Apply molybdenum disulfide lubricant on the mandrel surface, install the mandrel and shaft sleeve into the inner cavity, and check the coaxiality with a dial indicator (allowable deviation ≤ 0.02mm); iv) Cover the control unit cover, apply thread lock glue on the fastening bolts, install the bolts symmetrically, and tighten with a torque wrench (tightening torque 35-40N·m); v) Open the oil cup, fill the inner cavity with appropriate amount of lubricating grease (NLGI 2), and tighten the oil cup cover. 6. System Debugging & Leakage Test: a) Cooling Water System Debugging: i) Open the cooling water inlet valve slowly, adjust the water pressure to the rated range (0.3-0.5MPa), and check the water pipe joint, nut and pipeline with soapy water (no bubbles generated, indicating no leakage); ii) Observe the water flow stability with a flow meter, and confirm the pipeline is unblocked without water flow interruption. b) Hydrosphere Control Unit Debugging: i) Restore the power supply, start the drawworks for no-load operation, and check the hydrosphere control unit operation (flexible control, no jamming); ii) Monitor the drum shaft bearing temperature in real time with an infrared thermometer: within 30 minutes of operation, the temperature should drop from the initial 45℃ to 60-65℃ and stabilize; iii) Conduct load test: gradually apply 50%, 80%, and 100% of the rated load, each load level operates for 1 hour, and monitor the bearing temperature (stable within 70℃) and control unit operation status (no abnormal noise or oil leakage). 7. Post-Maintenance Inspection: After the drawworks operates stably for 4 hours, stop the machine to recheck: a) Check the water pipe assembly for water leakage, and the hydrosphere control unit for oil leakage; b) Recheck the tightness of the M52X2 nut and control unit cover bolts; c) Check the cooling water flow and pressure, and confirm the hydrosphere control unit control function is normal. 8. Long-Term Preventive Maintenance Measures: a) Formulate a fixed maintenance plan: Clearly stipulate that O-rings and PD100X130X12 oil seals are replaced every 12 months, and the 6218 bearing lubricating grease is supplemented every 500 operating hours; b) Daily inspection system: Add water pipe joint tightness, O-ring integrity, hydrosphere control unit oil level and bearing temperature to the daily inspection list (inspect 3 times a day, record data), and immediately stop the machine for inspection if water leakage is found or the bearing temperature exceeds 75℃; c) Regular cleaning: Clean the water pipe assembly and hydrosphere control unit inner cavity every 6 months, and install a filter at the cooling water inlet to reduce impurity erosion; d) Personnel training: Train on-site operators and maintenance personnel on the identification of O-ring and oil seal aging, and the standard operation process of joint assembly and lubricating grease replacement, ensuring potential faults are handled in time.
After maintenance, the water leakage was eliminated, the hydrosphere control unit worked normally, and the bearing temperature stabilized within 70℃.
Procurement Guide & Call to Action
All parts listed in this document are exclusively compatible with BOMCO drawworks series (JC-90, JC-70, JC-50, JC-40 and their DB/D variants), complying with API Spec 7K and GB/T 23505-2009 standards, with genuine quality and complete certification. When purchasing, please confirm the product's model, drawing number, part number, and the specific drawworks model to ensure accurate matching. Our professional technical team provides one-on-one technical consultation services, covering product selection, on-site installation guidance, fault diagnosis, and maintenance training. For detailed product parameters, material performance reports, API certification documents, and procurement quotes, please contact us at your convenience. We are committed to providing you with high-quality, genuine BOMCO drawworks water pipe assembly and hydrosphere control units parts and professional after-sales support, ensuring the efficient, stable, and safe operation of your drilling equipment.
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