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Weldolets

Weldolets are the most common branch connection fittings, designed for butt-welding onto outlet pipes with beveled ends, minimizing stress concentrations and providing integral reinforcement.

Widely used in oil and gas, petrochemical, and power generation industries, Weldolets ensure strong and reliable branch connections in high-pressure piping systems.

Weldolets

Weldolets are butt-weld fittings that facilitate branch connections by welding directly onto the run pipe, with beveled ends ensuring a smooth and strong weld joint. Their design reduces stress concentrations at the connection point and provides integral reinforcement, making them ideal for high-pressure and high-temperature applications. Available in various materials and sizes, Weldolets are versatile for creating branch outlets in piping systems, offering superior strength compared to other branch fittings like threadolets or sockolets.

Key Properties of Weldolets

  • Strong Connection: Butt-weld design ensures robust branch connections.
  • Stress Reduction: Minimizes stress concentrations at the weld joint.
  • Integral Reinforcement: Provides built-in structural support for branch outlets.
  • Versatile Sizing: Available for a wide range of pipe diameters and schedules.

Common Standards and Materials

Weldolets are manufactured to meet stringent industry standards, ensuring compatibility and performance in demanding piping systems.

Type/Standard Material Application
Standard Weldolet: MSS SP-97, ASME B16.9 Carbon Steel (A105, A234 WPB), Stainless Steel (304/304L, 316/316L) Oil and gas pipelines, refineries
High-Pressure Weldolet: MSS SP-97 Alloy Steel (A182 F11, F22), Duplex (F51), Inconel 625 Power generation, high-pressure systems

Applications of Weldolets

Weldolets are critical in industries requiring reliable branch connections in piping systems:

  • Oil and Gas: Creates branch connections in pipelines and processing facilities.
  • Petrochemical: Used in reactors and processing plants for fluid distribution.
  • Power Generation: Facilitates steam and water branching in power plants.
  • Chemical Processing: Supports branch outlets in corrosive fluid systems.

Specifications

Properties Values & Limits
Material Carbon Steel (A105, A234 WPB), Stainless Steel (304/304L, 316/316L), Alloy Steel (A182 F11, F22), Duplex (F51), Inconel 625
Design Standards MSS SP-97, ASME B16.9
Connection Butt-Weld
Size Range 1/2" to 24" (Branch); Up to 36" (Run)
Pressure Rating Up to ANSI Class 2500 lbs
Wall Thickness Sch 10 to Sch XXS
Testing Standards ASME B31.3, ASME B16.9

Considerations for Use

  • Welding Quality: Ensure proper welding techniques to maintain joint integrity.
  • Material Compatibility: Match Weldolet material to pipe material to prevent corrosion.
  • Pipe Schedule: Select Weldolet size and schedule to match run and branch pipe specifications.