一,Multi-Type Forming Structure Matching Different Fuel Transportation Demands
Our factory supplies three mainstream forming types of fuel transmission line pipes corresponding to different pipe diameter and pressure requirements
Longitudinal Submerged Arc Welded (LSAW) fuel line pipe,It adopts steel plate rolling and double-sided submerged arc welding molding, applicable to DN400-DN2200 ultra-large bore trunk fuel pipelines. The internal and external double welding bead process ensures uniform wall thickness and seamless fusion of welding seams with the pipe base body; no internal welding protrusions will generate turbulence and medium sediment when crude oil and refined fuel flow through the pipeline, reducing long-term pipeline scaling and cleaning frequency
Spiral Submerged Arc Welded (SSAW) fuel transmission pipe,Continuous steel coil spiral winding molding realizes flexible adjustment of pipe diameter and wall thickness, suitable for oilfield branch fuel collection pipelines with scattered laying routes and variable flow rates. The spiral welding structure evenly disperses internal fuel pressure and external soil extrusion load, avoiding local stress concentration defects common in thin-wall straight welded pipes
seamless hot-rolled fuel line pipe for small-bore high-pressure fuel delivery branches,This matching accessory is a core structural design exclusive to export fuel transmission pipes: during ocean shipping, yard stacking and long-distance land transportation, the closed blue caps completely block rainwater, dust and saline mist from entering the pipe inner cavity, preventing inner wall rust and impurity contamination. Unprotected bare pipe ends will form inner wall corrosion pits within several months of outdoor storage, and these pits turn into stress notches that trigger fuel leakage under long-term medium pressure. Meanwhile, uniform machined welding bevels are reserved at each pipe end under the plastic cap, with consistent chamfer angle and smooth metal surface, supporting standard on-site submerged arc welding construction without secondary grinding processing by overseas construction teams,The multi-layer stacked isolation cushion blocks between pipe rows to prevent outer wall scratch damage, which can destroy subsequent 3LPE anti-corrosion coating adhesion
二,Core Performance Characteristics of Professional Fuel Transmission Steel Pipe：
Stable Hydrocarbon Medium Chemical Compatibility;
High Compressive & External Load Bearing Capacity;
Optional Low-Temperature Notch Toughness Base Metal for Frigid Region Projects;
Perfect Matching Compatibility with 3LPE External Anti-Corrosion Coating;
Excellent Welding Consistency for On-Site Pipeline Splicing;
Complete Traceability Marking System
三,Automated Closed-Loop Production & Multi-Round Inspection System
All fuel transmission line pipes for export are manufactured on fully automated continuous production lines, with multi-stage strict inspection before leaving the factory to guarantee unified performance of each batch goods, and complete English version test reports can be provided for overseas customs clearance and engineering audit;
The full workflow is arranged as follows： high-quality steel plate/steel coil incoming spectral composition inspection → plate flattening and edge milling → roll forming/spiral winding → double-sided submerged arc welding → welding seam ultrasonic real-time flaw detection → pipe sizing and straightening → pipe end bevel machining → inner and outer wall rust removal cleaning → optional 3LPE coating extrusion wrapping → blue plastic end cap installation (as shown in photos) → stacking storage with isolation pads;
Key inspection links include: ultrasonic automatic scanning of full-length welding seams to eliminate internal air pores and crack defects; hydrostatic pressure test for each single pipe under 1.5 times design working pressure to verify sealing performance; random sampling tensile test and low-temperature Charpy impact test for batch performance verification; high-voltage electric spark holiday detection for coated fuel pipes to check tiny pinhole anti-corrosion layer leakage points
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