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Hebei Longrun Pipeline Group Company manufactures pipe elbows for petroleum and chemical industry applications, where piping systems operate under high pressure, elevated temperatures, and corrosive environments. In refineries, petrochemical complexes, fertilizer plants, and offshore platforms, pipe elbows are critical components used to change flow direction while maintaining structural strength and internal flow stability.
In petroleum and chemical processing facilities, elbows are typically installed in crude oil transport lines, catalytic cracking units, distillation columns, heat exchanger circuits, and chemical reaction systems. These pipelines often handle aggressive media such as hydrocarbons, hydrogen sulfide, steam, acids, and chemical solvents. Under such service conditions, elbows must withstand:
High internal pressure
Thermal expansion and contraction
Flow-induced vibration
Corrosive and erosive fluids
The correct selection of material grade, wall thickness, and bending radius is essential to ensure safe long-term operation.
Our pipe elbows are manufactured from carbon steel, low-alloy steel, and alloy steel materials commonly specified for petroleum and chemical projects. Typical standards include ASTM A234, ASTM A420, and equivalent international specifications. For high-temperature services, chromium-molybdenum alloy steels may be used to enhance creep resistance and oxidation resistance.
All raw materials are verified through chemical composition analysis and mechanical property testing before entering production. Material traceability is maintained from raw steel procurement to final shipment, ensuring compliance with project documentation requirements.
Pipe elbows for petroleum and chemical industry applications are produced using hot induction bending or hot forming techniques. In hot induction bending:
A straight pipe section is heated locally by an induction coil.
The heated zone is bent to the required angle—commonly 45°, 90°, or 180°.
Controlled cooling ensures uniform mechanical properties along the bend.
For seamless elbows, a hot pushing process may be applied, where a heated pipe is pushed over a mandrel to achieve the required curvature and radius (such as 1D, 1.5D, or 3D). This method ensures consistent wall thickness distribution and smooth internal surfaces, which are important for minimizing turbulence and pressure loss.
Following forming, elbows undergo appropriate heat treatment, such as normalizing or quenching and tempering, depending on the material grade and design conditions. These processes improve grain structure, enhance impact toughness, and relieve residual stresses created during bending.
Mechanical testing includes tensile testing, hardness measurement, and impact testing when low-temperature service is specified. Nondestructive testing methods such as ultrasonic testing (UT), radiographic testing (RT), and magnetic particle inspection (MT) are performed to detect internal or surface discontinuities.
Surface preparation is carried out according to the intended application. Options include shot blasting to remove scale and oxidation, beveling for butt-weld connections, and protective coatings for corrosion prevention during storage and transportation. For aggressive environments, additional coating systems can be applied based on client specifications.
Pipe elbows manufactured by Hebei Longrun Pipeline Group Company are widely used in:
Crude oil and refined product pipelines
Chemical processing lines handling reactive substances
High-pressure steam and condensate systems
Hydrogenation and reforming units
Offshore and onshore energy infrastructure
Through controlled production processes and strict inspection procedures, our elbows are designed to meet the operational requirements of petroleum and chemical industry projects while maintaining compliance with international piping standards.
