Benefits of Welded Barred Pipe Tees

In the complex network of modern industrial piping systems, the integrity of each fitting is critical to the overall performance and safety of the operation. Among these essential components, the Welded Barred Pipe Tee stands out as a specialized solution designed for applications where the movement of pigs (pipeline inspection gauges) or cleaning tools is required. These fittings are engineered to maintain the internal diameter of the pipeline while preventing the tool from entering the branch connection.

Raw Material Selection and Preparation
The production of a high-quality welded barred tee begins with the selection of raw materials. At facilities like Hebei Longrun Pipeline Group Co., Ltd, the process prioritizes compliance with international standards such as ASTM A234, ASTM A860, or DIN 2605. The pipe used for the main body is sourced to match the specified grade of the main pipeline, ensuring consistency in chemical composition and mechanical properties. Before fabrication, the pipe ends are prepared with beveled edges to facilitate a strong, full-penetration weld.

The Welding and Fabrication Process
Unlike a standard forged tee, a welded barred tee is typically fabricated from pipe sections. The process involves cutting an elliptical hole in the main pipe (the run) and fitting the branch pipe (the outlet) into this opening. This is a precise operation that requires skilled welding technicians to ensure the alignment is exact and the fit-up is tight.

The critical feature of this fitting is the "bar" or "bridge" installed inside the branch outlet. This bar is strategically welded across the bore of the branch. Its placement is calculated to allow the smooth passage of a pig through the main run without snagging, while the bar physically blocks the pig from entering the side branch. This welding is performed using methods like Gas Tungsten Arc Welding (GTAW/TIG) for the root pass or Shielded Metal Arc Welding (SMAW) for subsequent passes to ensure a secure attachment that can withstand operational flow and vibration.

Post-Weld Heat Treatment and Testing
To relieve residual stresses induced during the welding process, the completed barred tee often undergoes Post-Weld Heat Treatment (PWHT). This step is crucial for restoring the material's ductility and ensuring long-term durability in high-pressure environments. Following heat treatment, the fitting is subjected to rigorous non-destructive testing. This typically includes radiographic or ultrasonic testing to verify the soundness of the main welds and magnetic particle inspection on the bar welds. Dimensional inspections are also carried out to confirm the end-to-end dimensions, branch height, and the angle of the branch (typically 90 degrees) meet the specified tolerances.

The structural integrity of the welded barred tee makes it a reliable choice for transmission pipelines, refineries, and chemical plants where operational efficiency and maintenance pigging are routine requirements.