Core Application & Target User Demand Overview
This document focuses on the dual standpipe device components specifically engineered for Lanzhou LS series drilling masts, with full compatibility for the 111.53 series dual standpipe system—a critical assembly for drilling fluid circulation and well control in oilfield, mining, and geothermal drilling operations. The covered parts, including the Pipe grapple 111.53.211.00 and matching fasteners (eye bolt, slotted nut, washer, cotter pin), are essential for securing standpipe sections, ensuring stable drilling fluid transmission, and maintaining operational safety. Target users include oilfield drilling contractors, mining exploration teams, geothermal project operators, and professional drilling equipment maintenance service providers who manage or service Lanzhou LS drilling masts. Key user demands center on component interchangeability with original LS mast systems, high load-bearing capacity for standpipe stabilization, corrosion resistance in harsh field environments (high humidity, salt spray, drilling fluid exposure), and compliance with drilling industry safety standards (API Spec 4F, GB/T 23507-2009). Critical pain points addressed include pipe grapple wear from repeated clamping/unclamping cycles, fastener loosening under drilling vibration, corrosion-induced failure of metal components, and improper fastener installation leading to standpipe instability. All parts documented herein undergo stringent quality validation, including dimensional precision testing, material strength analysis, and corrosion resistance trials, ensuring seamless integration and reliable performance.
Classification of Lanzhou LS Dual Standpipe Device Parts
The Lanzhou LS dual standpipe device parts are categorized into two functional groups based on their role in the standpipe system: Dual Standpipe Core Components and Fasteners (Eye Bolts, Nuts, Washers, Cotter Pins). Each category is designed to address specific operational requirements—core components for standpipe clamping and stabilization, and fasteners for secure assembly of core components to the mast structure. Pre-table descriptions for each category clarify core functions, highlight field-specific pain points, emphasize value propositions (e.g., high-strength materials, precision machining, anti-corrosion treatments), and anchor typical application scenarios (onshore oil drilling, offshore exploration, deep mining drilling). Technical specification tables standardize critical information—material composition, primary wear causes, and damage prevention guidelines—to support informed procurement decisions and on-site maintenance, ensuring compliance with drilling industry safety and operational standards.
1. Dual Standpipe Core Components
Dual Standpipe Core Components (Pipe grapple 111.53.211.00) are the primary clamping and stabilizing components of the Lanzhou LS dual standpipe system. The pipe grapple is responsible for securely holding standpipe sections in place, preventing displacement during drilling operations and ensuring unobstructed drilling fluid circulation. Common pain points in field applications include wear of clamping jaws due to repeated contact with standpipe surfaces, deformation of the grapple body under overload, corrosion of metal components in drilling fluid-contaminated environments, and failure of the clamping mechanism due to inadequate lubrication. This core component adopts high-strength alloy steel and precision forging processes to enhance clamping force and durability. It is critical for maintaining the structural stability of the dual standpipe system and ensuring safe drilling fluid transmission in high-intensity drilling scenarios.
Product Serial No. | Part Name & Model | Material Specification | Primary Wear Causes | Damage Prevention Guidelines |
1 | Pipe Grapple (111.53.211.00) | Grapple Body: 42CrMo Alloy Steel (Quenched & Tempered, Hardness HRC 30-35); Clamping Jaws: 40CrNiMoA Alloy Steel (Nitrided, Hardness HV ≥850); Clamping Mechanism: Forged Integral Structure; Surface Treatment: Shot Blasting + Epoxy Primer + Polyurethane Topcoat; Sealing Elements: Nitrile Butadiene Rubber (NBR) | 1. Uneven wear of clamping jaws due to repeated clamping/unclamping cycles and friction with standpipe surfaces; 2. Deformation of grapple body under overload (exceeding rated clamping force); 3. Corrosion of metal components in drilling fluid (containing corrosive additives) and high-humidity environments; 4. Seizure of clamping mechanism due to sand dust intrusion and inadequate lubrication; 5. Fatigue cracks in the grapple body due to cyclic load stress | 1. Inspect clamping jaws weekly for wear; rework or replace the grapple if jaw wear depth exceeds 1.5mm or uneven wear is ≥0.8mm; ensure the standpipe surface is clean (free of rust, debris) before clamping to reduce jaw abrasion; 2. Calculate the standpipe weight and fluid pressure before use; ensure the applied load does not exceed the grapple’s rated clamping force (refer to Lanzhou LS dual standpipe device technical manual); avoid sudden load impacts; 3. Clean the grapple body with neutral detergent immediately after contact with drilling fluid; dry and apply anti-corrosion oil to exposed metal surfaces; for offshore applications, apply marine-grade anti-corrosion coating annually; 4. Lubricate the clamping mechanism (pins, hinges) with molybdenum disulfide grease every 2 weeks; install dust covers on moving parts to prevent sand dust intrusion; 5. Conduct non-destructive testing (magnetic particle testing) on the grapple body every 6 months to detect fatigue cracks; replace the grapple immediately if cracks are found |
2. Fasteners (Eye Bolts, Nuts, Washers, Cotter Pins)
Fasteners (Eye bolt in tail M24×80 GB31.1-88, Slotted nut M24 GB6178-86, etc.) are critical for assembling the pipe grapple to the Lanzhou LS mast structure and securing other components of the dual standpipe system. These fasteners must withstand high tensile force, shear force, and continuous vibration during drilling operations—loosening or failure can lead to grapple disengagement, standpipe instability, and catastrophic well control incidents. Common pain points include thread seizure due to sand dust contamination, bolt loosening from drilling vibration, corrosion of fasteners in harsh environments (salt spray, drilling fluid), and over-tightening-induced thread deformation. Adopting high-strength alloy steel and anti-corrosion surface treatments (zinc plating + passivation), these fasteners comply with national standards (GB) and ensure reliable fastening performance. They are essential for maintaining the structural integrity of the dual standpipe device in all drilling scenarios.
Product Serial No. | Part Name & Model | Material Specification | Primary Wear Causes | Damage Prevention Guidelines |
1 | Eye Bolt in Tail M24×80 GB31.1-88 (M24×80-8.8) | Bolt Body: 40Cr Alloy Steel (Quenched & Tempered, Strength Grade 8.8); Eye: Forged Integral Structure (Heat-Treated); Thread: Precision Rolled (Grade 6g); Surface Treatment: Zinc Plating + Passivation; Shank: Smooth Precision Ground; Load Capacity: Rated Working Load 50kN (GB/T 31.1) | 1. Thread seizure due to sand dust contamination during installation; 2. Eye deformation or cracking due to overload during lifting/installation; 3. Bolt loosening from continuous drilling vibration; 4. Corrosion of zinc coating in salt-spray and high-humidity environments; 5. Thread wear due to repeated assembly and disassembly | 1. Clean threads with a wire brush before installation; apply anti-seize lubricant (copper-based) to threads to prevent seizure; use a torque wrench to apply the recommended torque (320-350 N·m for M24-8.8 bolts, per GB/T 16823.1); 2. Calculate the lifting load before use; ensure it does not exceed the eye bolt’s rated working load (50kN); avoid side loading (keep load direction aligned with the bolt axis); inspect the eye for cracks using dye penetrant testing (DPT) before each use; 3. Use slotted nuts + cotter pins (GB/T 91) for anti-loosening; recheck torque every 2 weeks during drilling operations; 4. For offshore applications, replace with 316L stainless steel eye bolts; rinse with fresh water daily and apply anti-corrosion spray weekly; 5. Minimize unnecessary assembly and disassembly; replace the bolt if thread wear (fit clearance ≥0.1mm) is detected; store spare bolts in a dry, sealed container with desiccant |
2 | Slotted Nut M24 GB6178-86 (M24-8) | Nut Body: 45# Steel (Heat-Treated, Strength Grade 8); Thread: Precision Tapped (Grade 6H); Surface Treatment: Zinc Plating + Passivation; Type: Slotted Hexagonal Nut (GB/T 6178); Lock Groove: Precision Milled | 1. Thread deformation due to over-tightening; 2. Nut loosening due to cotter pin failure; 3. Corrosion of thread in drilling fluid-contaminated environments; 4. Lock groove damage from improper cotter pin installation; 5. Zinc coating peeling due to impact during installation | 1. Use a torque wrench to apply the correct torque (match the eye bolt’s torque requirement); do not exceed the rated torque to avoid thread deformation; 2. Inspect the cotter pin weekly for wear or breakage; replace if damaged; ensure the cotter pin is fully inserted and bent at a 90° angle to secure the nut; 3. Clean the nut and thread with diesel oil immediately after contact with drilling fluid; dry and apply anti-rust oil; 4. Use a cotter pin of the correct diameter (5mm for M24 slotted nuts); do not force oversized cotter pins into the lock groove to avoid groove damage; 5. Use a socket wrench for installation/removal; avoid using adjustable wrenches that may cause impact damage to the nut and coating |
3 | Washer 24 GB97.1-86 (24) | Washer Body: Q235 Steel (Hot-Rolled); Surface Treatment: Zinc Plating; Type: Flat Washer (GB/T 97.1); Inner Diameter: φ24mm; Outer Diameter: φ44mm; Thickness: 4mm; Hardness: HB 100-130 | 1. Deformation due to over-tightening of the slotted nut; 2. Corrosion of surface coating in humid and salt-spray environments; 3. Wear of contact surface due to vibration-induced friction; 4. Damage due to mismatched bolt diameter (oversized bolt hole) | 1. Ensure the washer is properly matched to the bolt diameter (M24); do not use oversized washers; follow the torque guidelines to avoid over-tightening and deformation; 2. Inspect the washer for corrosion monthly; replace if rust or coating peeling is found; for offshore applications, use 316L stainless steel washers; 3. Lubricate the washer’s contact surfaces with a thin layer of anti-wear grease before installation to reduce friction; replace washers during each maintenance cycle (every 6 months); 4. Check the washer’s inner diameter before installation; ensure it fits snugly with the bolt shank (clearance ≤0.2mm); do not reuse washers that have been stretched or damaged |
4 | Cotter Pin 5×40 GB91-86 (5×40) | Pin Body: Q235 Steel; Surface Treatment: Zinc Plating; Type: Split Cotter Pin (GB/T 91); Diameter: 5mm; Length: 40mm; Material Hardness: HB 90-120 | 1. Bending or breaking due to continuous drilling vibration; 2. Corrosion of zinc coating in high-humidity and drilling fluid environments; 3. Deformation due to improper installation (over-bending or under-bending); 4. Fatigue failure from repeated insertion and removal | 1. Install the cotter pin correctly: insert fully into the slotted nut’s lock groove and bend both ends at a 90° angle (avoid over-bending to prevent metal fatigue); inspect weekly for wear, breakage, or loosening; replace immediately if damaged; 2. Clean the cotter pin with neutral detergent after contact with drilling fluid; dry and apply anti-rust oil; store spare pins in a dry container; 3. Use pliers of the correct size for installation; avoid using excessive force when bending; 4. Minimize unnecessary removal of the cotter pin; replace every 3 months or during each maintenance cycle, even if no visible damage is found |
Procurement Guidance & Technical Support
All Lanzhou LS dual standpipe device parts documented herein are 100% compatible with original Lanzhou LS series drilling mast models, manufactured in strict compliance with API Spec 4F, GB/T 23507-2009, and original equipment design specifications. Each part undergoes rigorous quality control, including dimensional accuracy verification, material strength testing, load-bearing validation, and corrosion resistance trials, ensuring reliable performance in the harshest drilling environments. By choosing our genuine parts, you can ensure seamless integration with your Lanzhou LS dual standpipe system, minimize unplanned downtime, and enhance operational safety. We provide comprehensive technical support, including personalized part selection guidance based on your specific mast model and operational needs, on-site installation consultation, and maintenance training to optimize component performance and extend service life. To inquire about part availability, obtain detailed technical drawings, or place an order, please contact our professional sales team. We are dedicated to delivering high-quality genuine parts and tailored services to support the safe and efficient operation of your oilfield, mining, or geothermal drilling projects.
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