Weldolet dimensions

Integrally Reinforced Forged Branch Outlet Fittings – Socket Welding, Threaded, and Buttwelding Ends.

Fittings manufactured to this Standard Practice are designed to make a fully reinforced branch connection in accordance with applicable piping code requirements, when attached, at an opening in a run pipe by means of a full penetration weld.

This classification refers to its beveled outlet that is butt-welded to the branch pipe during installation. The weldolet is ideal for replacing a tee on 90-degree branches with a reinforced connection that protects the branch pipe by reducing stress concentration due to its shape and size.

Fittings may be made to special dimensions, size, shape, tolerances, or of other wrought material by agreement between the manufacturer and the purchaser.

Weldolets are specialized branch connection fittings designed to create robust, leak-free connections in industrial piping systems. Conforming to standards such as MSS SP-97, ASME B31.3, and ASTM specifications, weldolets are engineered for high-performance applications, including boiler pipeline protection, oil and gas pipelines, chemical processing, and power generation. Their welded design ensures exceptional corrosion resistance and structural integrity, making them ideal for demanding environments requiring reliable branch connections.

Manufactured from materials like carbon steel (ASTM A105, A234 WPB), stainless steel (ASTM A182 F304/316L), or alloy steel, weldolets are produced through forging or machining processes to ensure high strength and precision. These fittings are welded directly onto the main pipe, providing a strong, permanent branch connection without compromising the pipeline’s integrity. Available in sizes from 1/2” to 24” (DN15 to DN600) for the branch and compatible with main pipes up to 48” (DN1200), weldolets come in schedules from SCH 10 to XXS. Surface treatments like galvanizing, 3LPE, or passivation enhance corrosion resistance, ensuring durability in harsh environments such as petrochemical plants and marine applications.

Welded branch fittings like weldolets undergo stringent testing, including hydrostatic, ultrasonic, and radiographic inspections, to ensure weld quality and compliance with MSS SP-97 and ASME standards. With tensile strengths ranging from 415 MPa (carbon steel) to 515 MPa (stainless steel), weldolets provide reliable performance in systems handling high-pressure fluids, corrosive gases, or abrasive materials. Their contoured design ensures a smooth transition of flow, minimizing turbulence and pressure loss, making them ideal for industrial piping systems where efficiency and durability are critical.

The primary advantage of weldolets lies in their ability to create strong, compact branch connections with minimal welding, reducing installation time and costs compared to traditional tees or fabricated branches. Their reinforced design provides superior strength at the branch point, making them suitable for high-pressure and high-temperature applications, such as in boiler pipeline protection. Weldolets are particularly effective in retrofitting existing pipelines or adding branches in confined spaces, offering flexibility for complex piping layouts in refineries, chemical plants, and power generation facilities.

Weldolets address critical challenges like pipeline corrosion, pressure loss, and complex branching in industrial systems. Their robust construction, compliance with strict standards, and material versatility make them a preferred choice for engineers seeking durable pipe connections. Whether used in high-temperature boiler systems, corrosive petrochemical environments, or hygienic food processing lines, weldolets deliver unmatched performance, safety, and longevity.

A weldolet, also called welding outlet, is a way of connecting a welded connection that is contoured at the bottom to match the contour of the pipe. So one end of the welding outlet is welded on the pipe, whereas the other end is open to be welded to any other pipe or equipment. A welding outlet requires mentioning the size of out let and the "Run Size" of pipe so the contour can match the contour of the pipe. The size of the welding outlet will always be smaller than run size such as 1/2" welding outlet can be used on pipe (run size) 1/2" and bigger.

Materials & Standards

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