Core Application & Target User Demand
This catalog covers key fluid end spare parts exclusively compatible with Lanzhou LS mud pumps, focusing on core components such as fluid end discharge/suction modules and fastening studs/nuts. Tailored for oilfield maintenance teams, Lanzhou LS authorized service providers, and drilling contractors, it addresses pain points such as fluid end leakage, pressure instability, and structural failure caused by worn or mismatched parts. The core value lies in ensuring the structural integrity and sealing performance of the Lanzhou LS mud pump fluid end, minimizing unplanned downtime, and adapting to harsh oilfield working conditions (high pressure, vibration, and abrasive mud environments).
1. Fluid End Modules
Fluid end modules are core structural components of Lanzhou LS mud pumps, responsible for forming the mud suction and discharge chambers. Their structural strength and sealing performance directly determine the pump's pressure-bearing capacity and operational stability. A real on-site maintenance case: A Lanzhou LS F-1600 mud pump experienced severe discharge end leakage. Inspection found that the Module, Fluid End Discharge 107.36.122.01 had cracked at the weld due to long-term high-pressure operation and vibration. After replacing the module with an original part (complying with Lanzhou LS specification LS/T 003-2023) and re-tightening the fastening studs according to the specified torque, the leakage was completely resolved.
Serial No. | Part Name & Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | Module, Fluid End Discharge 107.36.122.01 | Alloy steel (42CrMo) with quenching and tempering treatment; weld seam ultrasonic testing qualified; surface anti-corrosion coating; pressure-bearing capacity ≥ 45 MPa | 1. Weld fatigue cracking due to long-term high-pressure fluctuation and pump body vibration; 2. Corrosion and wear of the inner cavity caused by abrasive mud scouring | 1. Regularly inspect weld seams with ultrasonic testing every 6 months; 2. Control mud sand content ≤ 10% (mass fraction) and equip with high-precision desander to reduce inner cavity scouring |
2 | Module, Fluid End Suction 107.36.120.01 | Carbon steel (Q355B) with welded structure; inner cavity precision machining; surface galvanized + anti-corrosion paint double protection; suitable for low-medium pressure suction systems | 1. Deformation of the suction port due to uneven stress during installation; 2. Corrosion of the outer surface caused by long-term exposure to oilfield moisture and chemicals | 1. Ensure the installation surface is flat (flatness ≤ 0.02 mm/m) and tighten the fixing bolts in a diagonal sequence; 2. Reapply anti-corrosion paint to the outer surface every 12 months and check for corrosion regularly |
2. Fluid End Studs & Nuts
Fluid end studs and nuts are critical fastening components for Lanzhou LS mud pumps, responsible for fixing the fluid end modules and ensuring the sealing of the fluid end assembly. Their tensile strength and anti-loosening performance directly affect the structural stability of the fluid end. All parts comply with API Spec 7K Clause 6.5 (Fastening Components) and Lanzhou LS internal standard LS/QS 007-2023.
Serial No. | Part Name & Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | Stud, Fluid End 107.36.120.02 | Alloy steel (35CrMo) with 10.9 grade strength; thread precision 6H; surface phosphating treatment; tensile strength ≥ 1000 MPa | 1. Thread wear and sliding caused by repeated disassembly and assembly with improper torque; 2. Fatigue fracture due to long-term bearing of alternating loads from pump vibration | 1. Use a torque wrench to tighten according to the specified torque (320-350 N·m) and disassemble with a matching tool; 2. Install spring washers to enhance anti-loosening performance and check tightness every 500 operating hours |
2 | Stud, Fluid End 107.29.111.04 | Stainless steel (304) with 8.8 grade strength; corrosion-resistant; thread type M16×150; suitable for humid and corrosive oilfield environments | 1. Pitting corrosion of the thread caused by saltwater and chemical intrusion; 2. Deformation of the stud rod due to uneven stress during installation | 1. Apply anti-corrosion thread sealant during installation; 2. Ensure uniform stress during installation and avoid over-tightening (torque ≤ 280 N·m) |
3 | Stud, Fluid End 107.36.122.02 | Alloy steel (42CrMoV) with 12.9 grade ultra-high strength; surface nitriding treatment; thread wear resistance ≥ 500 assembly-disassembly cycles; tensile strength ≥ 1220 MPa | 1. Fatigue failure of the rod due to long-term high-pressure and high-vibration operation; 2. Nitriding layer peeling caused by improper assembly scratch | 1. Operate within the rated pressure range of the mud pump to reduce alternating loads; 2. Use a guide sleeve during assembly to avoid scratching the nitriding layer |
4 | Stud, Fluid End 107.36.122.03 | Carbon steel (45#) with 8.8 grade strength; surface galvanized; thread precision 6H; cost-effective for medium-pressure fluid end fastening | 1. Galvanized layer damage and rusting caused by collision during transportation and installation; 2. Thread jamming due to mud and debris intrusion | 1. Use shock-absorbing packaging during transportation and avoid collision during installation; 2. Clean the thread with a brush before assembly and apply anti-rust lubricant |
5 | Nut LNB/AC2-2-07U | Stainless steel (316L) with hexagonal structure; thread type M7; surface passivation treatment; corrosion-resistant and high-temperature resistant (up to 180℃) | 1. Thread wear caused by repeated matching with studs; 2. Loosening caused by pump vibration and insufficient anti-loosening measures | 1. Replace the nut when the thread wear exceeds 0.1 mm; 2. Use it with lock washers and check the locking status every 300 operating hours |
Procurement & Technical Reference Standards
All parts in this catalog are 100% compatible with Lanzhou LS mud pumps (e.g., F-1000, F-1600, F-2200 series) and comply with Lanzhou LS official technical specifications (LS/T 003-2023, LS/QS 007-2023) and international standards such as API Spec 7K (Drilling Equipment) and ISO 898-1:2019 (Mechanical Properties of Fasteners Made of Carbon Steel and Alloy Steel). For procurement, key guidelines include: 1. Confirm the exact part name, model, and application position (fluid end discharge/suction side) to ensure matching with the specific Lanzhou LS mud pump model; 2. Prioritize batch procurement of easily worn fastening parts (studs, nuts) to meet emergency maintenance needs; 3. Verify the supplier's authorization qualification (Lanzhou LS official authorized spare parts supplier) to ensure product authenticity, quality traceability, and compliance with pressure-bearing and safety requirements.
Technical maintenance reference: 1. Establish a preventive maintenance schedule based on operating hours: daily inspection of fluid end module leakage and stud/nut tightness; weekly inspection of stud rod bending deformation and nut thread integrity; monthly measurement of stud tensile force (using a tension meter) and module inner cavity wear; semi-annual disassembly and inspection of fluid end modules (replace parts when weld cracks or inner cavity wear exceeds 0.3 mm); 2. Use only Lanzhou LS original or authorized compatible parts, and special torque tools and anti-corrosion sealants that meet specification requirements to avoid damaging the fluid end's sealing and structural performance; 3. Maintain detailed maintenance records, including part replacement time, operating hours, and torque values during assembly, to achieve full-life cycle management of parts; 4. Conduct pre-startup inspections before each drilling operation to ensure all fluid end parts are intact, installed correctly, and the pressure-bearing and sealing systems are normal.
Call to Action
Reliable fluid end parts are the core guarantee for the stable and safe operation of Lanzhou LS mud pumps. Our catalog covers a full range of dedicated fluid end modules and fastening parts, featuring original quality, full compatibility, and strict compliance with official technical standards and international safety norms. With a professional technical team familiar with Lanzhou LS mud pump structures, we provide one-stop services such as part selection, fault diagnosis, and on-site maintenance guidance. Whether you need emergency replacement parts to resolve fluid end leakage or structural failure, long-term spare parts supply agreements, or technical consulting on fluid end maintenance, our team is ready to assist. Contact us today to discuss your specific needs and obtain personalized procurement plans that reduce maintenance costs, improve equipment operation efficiency, and extend the service life of your Lanzhou LS mud pump.
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