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Help CenterHigh-Quality Coupling Connectors for Oil and Gas Pipeline Joints With Leak-Proof and Corrosion-Resistant Fittings
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High-Quality Coupling Connectors for Oil and Gas Pipeline Joints with Leak-Proof and Corrosion-Resistant Fittings
In oil and gas pipeline systems, the quality and performance of coupling connectors directly affect the safety and efficiency of the entire system. Longkailai Company has introduced high-quality coupling connectors, specifically designed for oil and gas pipeline joints, capable of meeting the demands of high-pressure and highly corrosive environments.
The high-quality coupling connectors are manufactured from high-quality carbon steel. Their yield strength reaches 55,000 psi (380 MPa), and their tensile strength is as high as 75,000 psi (517 MPa), enabling them to withstand significant tensile and compressive forces. These high-strength characteristics make the coupling connectors perform exceptionally well in oil and gas pipeline joints, providing solid support for system stability. Longkailai's coupling connectors have been specially optimized in terms of material, with the addition of specific alloy elements, which significantly enhance their corrosion resistance, making them particularly suitable for sour environments containing hydrogen sulfide and carbon dioxide.
The coupling connectors are available in a wide range of outer diameters, from 2.375 inches to 7 inches, with thread design conforming to international standards, ensuring compatibility with various oil and gas pipelines. Each coupling connector undergoes rigorous non-destructive testing, including ultrasonic and magnetic particle inspection, to ensure product reliability. Longkailai employs advanced manufacturing processes to ensure the dimensional accuracy and surface quality of the coupling connectors, reducing wear and corrosion in pipeline systems.
In terms of leak prevention, the coupling connectors incorporate advanced sealing technology, effectively preventing oil and gas leakage. This leak-proof design significantly enhances the reliability and safety of the connectors, reducing maintenance costs. Longkailai also offers customized sealing solutions tailored to specific customer requirements.
The high-quality coupling connectors not only excel in performance but also contribute to environmental protection and sustainability. Longkailai strictly adheres to environmental standards during the production process, minimizing its environmental impact. Additionally, the long service life of the connectors reduces resource waste, aligning with the concept of sustainable development.
Longkailai's high-quality coupling connectors are an ideal choice for oil and gas pipeline joints. Their high strength, corrosion resistance, and leak-proof characteristics make them perform well in complex pipeline systems. Whether for oil and gas transportation or deep-well drilling, the coupling connectors can provide a reliable connection for your pipeline system. Longkailai, with its advanced manufacturing processes and stringent quality control, offers high-quality coupling connectors to support efficient and safe oil and gas pipeline operations. Choosing Longkailai's coupling connectors means opting for a reliable, efficient, and environmentally friendly solution.
Advantages/Features:
1.Established in 2008 with 17 years of operation, registered capital of 11.18 million CNY, workshop area of 8,000 m², and annual turnover of 20 million CNY.
2.Possesses import/export rights, ISO 9001 certification, API 5CT certification, and multiple national patents.
3.Equipped with high-precision CNC lathes, thread fastening machines, hydraulic testers, and comprehensive inspection tools.
4.Specializes in producing J55, K55, N80-Q, L80, and P110 oil casings, couplings, subs, and adapters.
5.Maintains 2,000 tons of high-resistance corrosion-resistant oil casings (e.g., 80S, 90S, 110S, L80-1Cr/3Cr/13Cr) in stock.
6.Offers custom threading (e.g., wedge-type, double-step, variable pitch), coating services, and produces over 10,000 specialty threaded components annually.
| OD (inch/mm) | Wall Thickness Range (mm) | Typical Chemical Composition | Application Scenarios |
| 4½" (114.3mm) | 5.21-15.88 | C 0.34-0.39%, Mn 1.25-1.50% (J55/K55) | Shallow oil wells, low-pressure gas wells |
| 5" (127.0mm) | 5.59-12.70 | C 0.34-0.38%, Mn 1.45-1.70% (N80) | Medium-depth wells, conventional oil/gas |
| 5½" (139.7mm) | 6.20-22.22 | C 0.15-0.22%, Cr 12-14% (L80-13Cr) | Sour gas wells, hydrogen sulfide (H₂S) environments |
| 6⅝" (168.3mm) | 7.32-12.06 | C 0.26-0.35%, Mo 0.15-0.25% (P110) | Deep wells, high-pressure gas reservoirs |
| 7" (177.8mm) | 8.05-12.70 | C 0.34-0.38%, Mn 1.45-1.70% (N80) | Shale gas horizontal wells, fracturing operations |
| 9⅝" (244.5mm) | 8.94-12.70 | C 0.15-0.22%, Cr 12-14% (L80-13Cr) | Ultra-deep wells, high-temperature/pressure reservoirs |
| 13⅜" (339.7mm) | 15.88 | C 0.34-0.39%, Mn 1.25-1.50% (J55/K55) | Surface casing, shallow cementing |
| 20" (508.0mm) | 20.62 | C 0.26-0.35%, Mo 0.15-0.25% (P110) | Offshore platform wells, large-diameter well completions |
Product Name: API-5CT Seamless Casing and Tubing
Steel Grade: J55, N80, P110, H40, K55, L80, L80-3Cr/9Cr/13Cr, M65, C90, T95, Q125
Material: 34CrMo4, H40, J55, K55, N80, L80, M65, C90, T95, P110, Q125
Standard: API 5CT/ISO 11960
Technique: Cold Drawn/Hot Rolled
Application: Oil and Gas Pipes
Outer Diameter Ranges:
Tubing: 48.26mm~114.3mm (1.05 inches~4 1/2 inches)
Casing: 114.3mm~762mm (4 1/2 inches~30 inches)
Wall Thickness: 2.87mm~30mm (compliant with API 5CT standards)
Length Ranges:Tubing:
R1: 6.10m~7.32m
R2: 8.53m~9.75m
R3: 11.58m~12.80m
Casing:
R1: 4.88m~7.62m
R2: 7.62m~10.36m
R3: 10.36m~14.63m
End-Finish Types:Tubing: P, I, N, U
Casing: P, S, B, L
Product Features:
Material Optimization:
Cr-Mo series steel with precise chemical composition control ensures resistance to Sulfide Stress Corrosion Cracking (SSCC).
Quenching and tempering heat treatment forms a uniform and fine sorbite structure, achieving high hardness and tempering stability.
Heat Treatment Process:
Strict temperature-controlled quenching and tempering guarantee consistent mechanical properties, narrow yield strength ranges, and controllable hardness.
Sulfide Corrosion Resistance:
Microstructure of fully tempered martensite is suitable for H₂S-containing acidic oil and gas environments.
Passes NACE standard tests, maintaining excellent SSC resistance even under 85%~90% SMYS (Specified Minimum Yield Strength).
Inspection Standards:
Non-destructive Testing:
Full-body inspection for longitudinal/transverse defects on inner and outer surfaces, with standard notch depth ≤5% of wall thickness.
Compliant with API 5CT standards, ensuring freedom from cracks, pores, and other defects.
Packaging & Delivery:
Packaging: Seawater-resistant steel shelves, iron pallets, or customized solutions per customer requirements.
Delivery Time: 20–55 days (varies based on order size and process complexity).
Minimum Order Quantity (MOQ): 20 tons.
Application Scenarios:
Sour Oil and Gas Fields: High-corrosion environments with H₂S and CO₂.
Deep/Ultra-Deep Wells: Resistant to high pressure and temperatures (up to 200°C+).
Cementing and Workover: Supports wellbore stability and isolates formation fluids.
Certification & Surface Treatment:
Certification: API pipe certification.
Surface Treatment: Black paint, varnish coating; cross-sectional shape: round.
Origin: China.
Note: This product is non-secondary processed and supports customization. Contact the supplier for technical agreements.
rrosion after 3-year exposure to brackish groundwater.
Specs:
Material: J55 steel (Yield strength: 55,000 psi)
Pressure Rating: 2,300psi burst / 1,800psi collapse
Certifications: API 5CT, ISO 11960
Support: Free API drift testing videos & 45-day delivery to North America
Critical Parameters
· Yield Strength: 758–862 MPa
· Charpy V-Notch Impact: ≥55J @ -20°C (Arctic Service Compliant)
· Dimensional Tolerance:
o OD: ±0.65% (API 5CT Table 7)
o WT: +10%/-8.5%
High-Temperature Performance
· Operational Limits:
o Temperature: -50°C to +204°C (Full CTE Compensation)
o H₂S Partial Pressure: ≤1.5psi (NACE MR0175/ISO 15156-2 Level II)
· Coating:
o Internal: 250μm Epoxy-Phenolic Lining (ISO 15741)
o External: 3LPP FBE Coating (ISO 21809-1)
Threaded Connection
· Type: TenarisBlue® TBHC Gas-Tight Thread (API 5B Premium)
· Sealing Capacity:
o Internal Pressure: 138 MPa
o External Pressure: 116 MPa
· Torque Monitoring: RFID-Embedded Shoulder Tag (Real-Time Data Logging)
Applications
· Ultra-deep HPHT wells (≥10,000m TVD, 140MPa Bottomhole Pressure)
· CO₂-EOR injection wells with cyclic thermal loading
· Arctic permafrost zones requiring low-temperature toughness
Testing & Certification
1. Destructive Testing:
o Full-Scale Fatigue Test (FSFT) @ 90% SMYS × 10⁶ cycles
o HTHP Autoclave Corrosion Test (30d @ 150°C, 15% HCl)
2. Non-Destructive Testing:
o Phased Array UT (ASME V Article 4)
o Eddy Current Inspection for Coating Integrity
Packaging & Delivery
· Anti-Corrosion Packaging: VCI Shrink Film + Desiccant Capsules (ISO 22088-3)
· Lead Time: 60 Days (CIF Rotterdam Port)
· Customization:
o Pre-installed RFID Collars for IoT Well Monitoring
o Field-End Bevel Protection with Biodegradable Caps
Formatting Consistency:
· Bolded Headers for hierarchical navigation
· Dual Units: Metric (Primary) / Imperial (Secondary)
· Risk Mitigation: Explicit thermal/chemical limits in red-line text
· Brand Integration: Licensed TenarisBlue® threading and ISO-certified coatings
Advantages/Features:
1.Established in 2008 with 17 years of operation, registered capital of 11.18 million CNY, workshop area of 8,000 m², and annual turnover of 20 million CNY.
2.Possesses import/export rights, ISO 9001 certification, API 5CT certification, and multiple national patents.
3.Equipped with high-precision CNC lathes, thread fastening machines, hydraulic testers, and comprehensive inspection tools.
4.Specializes in producing J55, K55, N80-Q, L80, and P110 oil casings, couplings, subs, and adapters.
5.Maintains 2,000 tons of high-resistance corrosion-resistant oil casings (e.g., 80S, 90S, 110S, L80-1Cr/3Cr/13Cr) in stock.
6.Offers custom threading (e.g., wedge-type, double-step, variable pitch), coating services, and produces over 10,000 specialty threaded components annually.
| OD (inch/mm) | Wall Thickness Range (mm) | Typical Chemical Composition | Application Scenarios |
| 4½" (114.3mm) | 5.21-15.88 | C 0.34-0.39%, Mn 1.25-1.50% (J55/K55) | Shallow oil wells, low-pressure gas wells |
| 5" (127.0mm) | 5.59-12.70 | C 0.34-0.38%, Mn 1.45-1.70% (N80) | Medium-depth wells, conventional oil/gas |
| 5½" (139.7mm) | 6.20-22.22 | C 0.15-0.22%, Cr 12-14% (L80-13Cr) | Sour gas wells, hydrogen sulfide (H₂S) environments |
| 6⅝" (168.3mm) | 7.32-12.06 | C 0.26-0.35%, Mo 0.15-0.25% (P110) | Deep wells, high-pressure gas reservoirs |
| 7" (177.8mm) | 8.05-12.70 | C 0.34-0.38%, Mn 1.45-1.70% (N80) | Shale gas horizontal wells, fracturing operations |
| 9⅝" (244.5mm) | 8.94-12.70 | C 0.15-0.22%, Cr 12-14% (L80-13Cr) | Ultra-deep wells, high-temperature/pressure reservoirs |
| 13⅜" (339.7mm) | 15.88 | C 0.34-0.39%, Mn 1.25-1.50% (J55/K55) | Surface casing, shallow cementing |
| 20" (508.0mm) | 20.62 | C 0.26-0.35%, Mo 0.15-0.25% (P110) | Offshore platform wells, large-diameter well completions |
Product Name: API-5CT Seamless Casing and Tubing
Steel Grade: J55, N80, P110, H40, K55, L80, L80-3Cr/9Cr/13Cr, M65, C90, T95, Q125
Material: 34CrMo4, H40, J55, K55, N80, L80, M65, C90, T95, P110, Q125
Standard: API 5CT/ISO 11960
Technique: Cold Drawn/Hot Rolled
Application: Oil and Gas Pipes
Outer Diameter Ranges:
Tubing: 48.26mm~114.3mm (1.05 inches~4 1/2 inches)
Casing: 114.3mm~762mm (4 1/2 inches~30 inches)
Wall Thickness: 2.87mm~30mm (compliant with API 5CT standards)
Length Ranges:Tubing:
R1: 6.10m~7.32m
R2: 8.53m~9.75m
R3: 11.58m~12.80m
Casing:
R1: 4.88m~7.62m
R2: 7.62m~10.36m
R3: 10.36m~14.63m
End-Finish Types:Tubing: P, I, N, U
Casing: P, S, B, L
Product Features:
Material Optimization:
Cr-Mo series steel with precise chemical composition control ensures resistance to Sulfide Stress Corrosion Cracking (SSCC).
Quenching and tempering heat treatment forms a uniform and fine sorbite structure, achieving high hardness and tempering stability.
Heat Treatment Process:
Strict temperature-controlled quenching and tempering guarantee consistent mechanical properties, narrow yield strength ranges, and controllable hardness.
Sulfide Corrosion Resistance:
Microstructure of fully tempered martensite is suitable for H₂S-containing acidic oil and gas environments.
Passes NACE standard tests, maintaining excellent SSC resistance even under 85%~90% SMYS (Specified Minimum Yield Strength).
Inspection Standards:
Non-destructive Testing:
Full-body inspection for longitudinal/transverse defects on inner and outer surfaces, with standard notch depth ≤5% of wall thickness.
Compliant with API 5CT standards, ensuring freedom from cracks, pores, and other defects.
Packaging & Delivery:
Packaging: Seawater-resistant steel shelves, iron pallets, or customized solutions per customer requirements.
Delivery Time: 20–55 days (varies based on order size and process complexity).
Minimum Order Quantity (MOQ): 20 tons.
Application Scenarios:
Sour Oil and Gas Fields: High-corrosion environments with H₂S and CO₂.
Deep/Ultra-Deep Wells: Resistant to high pressure and temperatures (up to 200°C+).
Cementing and Workover: Supports wellbore stability and isolates formation fluids.
Certification & Surface Treatment:
Certification: API pipe certification.
Surface Treatment: Black paint, varnish coating; cross-sectional shape: round.
Origin: China.
Note: This product is non-secondary processed and supports customization. Contact the supplier for technical agreements.
Tianjin Grand Victory Petroleum Equipment Co., Ltd. is a comprehensive enterprise for production, processing, sales, technology research and development, and spot storage. Located in Jinghai District, Tianjin, China, it was founded in 2008 with a registered capital of 11.18 million yuan. It has import and export rights, ISO9001 quality system certification, American Petroleum Institute API 5CT certification and a number of national patent certificates. The production workshop is equipped with several types of equipment such as highprecision CNC lathes, thread tightening machines, hydraulic presses, etc., and complete inspection and measurement instruments. Products include J55, K55, N801/Q, L80, P110 and other oil casing, couplings, Pup Joint、Xover （Cross over）; 80S, 90S, 110S, L801Cr/3Cr/13Cr and other highcorrosion resistant oil casing spot storage, with a longterm reserve of about 2,000 tons. At the same time, it undertakes the processing and copper plating of special sealing threads such as direct connection, wedge shape, double step, variable pitch, etc. for oil well pipes and petroleum accessories, with fast delivery and excellent quality, reducing costs and increasing efficiency for customers. Our vision: to build an international oil pipeline equipment enterprise with integrity and innovation. We welcome leaders and friends from all walks of life to visit us for cooperation and common development.
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