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Nipoflanges

Nipoflanges are hybrid branch connection fittings combining a Weldolet, Nipolet, and flange, featuring a welding connection to the run pipe and a flange connection for the branch.

Designed for high-pressure piping systems, Nipoflanges are used in oil and gas, petrochemical, and power generation industries for secure and versatile branch connections.

Nipoflanges

Nipoflanges integrate the features of a Weldolet, Nipolet, and flange, offering a robust solution for branch connections. The fitting is welded to the run pipe using a butt-weld or fillet weld, while the branch side features a flange that connects to flanged valves, fittings, or pipes, allowing for easy assembly and disassembly. This design provides integral reinforcement, reducing stress concentrations, and is ideal for applications requiring a transition from welded to flanged systems. Nipoflanges are typically used in high-pressure and high-temperature environments, ensuring reliable performance and compatibility with standard flange specifications.

Key Properties of Nipoflanges

  • Hybrid Design: Combines welding and flange connections for versatile branch setups.
  • Flange Connection: Enables easy connection to flanged components, simplifying maintenance.
  • Stress Reduction: Integrally reinforced to minimize stress at the weld and flange joint.
  • High-Pressure Capability: Suitable for demanding applications with robust construction.

Common Standards and Materials

Nipoflanges are manufactured to meet industry standards, ensuring compatibility and performance in critical piping systems.

Type/Standard Material Application
Standard Nipoflange: MSS SP-97, ASME B16.5 Carbon Steel (A105, A234 WPB), Stainless Steel (304/304L, 316/316L) Oil and gas, petrochemical processing
High-Pressure Nipoflange: MSS SP-97 Alloy Steel (A182 F11, F22), Duplex (F51), Inconel 625 Power generation, high-pressure systems

Applications of Nipoflanges

Nipoflanges are essential in industries requiring reliable branch connections with flanged interfaces:

  • Oil and Gas: Connects flanged valves or fittings in pipelines and processing facilities.
  • Petrochemical: Facilitates branch connections in reactors and processing plants.
  • Power Generation: Supports high-pressure steam and water systems with flanged interfaces.
  • Chemical Processing: Ensures secure connections in corrosive fluid systems with flanged components.

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 B16.5 (Flange), ASME B16.11 (Weld)
Connection Butt-Weld or Fillet Weld (Run Pipe), Flange (Branch)
Size Range 1/2" to 24" (Branch Flange); Up to 36" (Run)
Pressure Rating ANSI Class 150 to 2500 (Flange), Class 3000 to 6000 (Weld)
Wall Thickness Sch 40 to Sch XXS
Testing Standards ASME B31.3, ASME B16.5, ASME B16.11
Flange Types Weld Neck, Slip-On, Blind (per ASME B16.5)

Considerations for Use

  • Welding Quality: Ensure proper welding techniques for the run pipe connection to maintain integrity.
  • Flange Compatibility: Match flange type and rating to branch components for secure sealing.
  • Material Compatibility: Select Nipoflange material to match run and branch pipe to prevent corrosion.
  • Gasket Selection: Use appropriate gaskets for flanged connections to ensure leak-free performance.