Union branch outlet
The Unionolet union branch outlet is a specialized branch pipe fitting for high-pressure instrument pipelines that features integrated quick-disconnect, self-contained reinforcement, and zero redundant welds. It primarily addresses the engi
Inquiry
- The core advantages of the Unionolet branch outlet are its one-piece forged three-in-one structure, single main pipe weld, self-contained equal-area reinforcement, no-cutting quick disassembly, repeated assembly and disassembly, and zero re
- Comprehensive safety and operation and maintenance convenience far exceed traditional split union combination structures. The whole is hot forged in one piece with no splicing welds
- The material is dense and uniform, pressure resistant and fatigue resistant, and the structural strength is stable
- Fully compliant with MSS SP-97 high-pressure reinforcement requirements
- No additional reinforcement pad needed
Detailed Introduction
The union branch outlet is formed by integral hot forging, with the saddle base fitting against the outer wall of the main pipe for welding, and the branch end comes with an MSS SP-83 standard high-pressure union, allowing quick unscrewing for maintenance, isolation of instruments and valves, without the need to cut the pipeline or disassemble welds. Body reinforcement follows MSS SP-97, union sealing and threads comply with ASME B16.11 and MSS SP-83, with domestic equivalents GB/T19326 and GB/T14383. Main pipe NPS2-NPS48, branch NPS1/8-NPS2, pressure ratings 3000LB and 6000LB, sealing available in two types: spherical metal hard seal and gasket soft seal. Materials cover carbon steel A105, LF2 low-temperature steel, 304/316L stainless steel, F11/F22 chrome-molybdenum alloy steel, 2205 duplex steel, and nickel-based alloys. Suitable for high-pressure instrument branch projects with dense instruments, high-frequency disassembly and assembly, prohibition of hot work, and requirements to reduce weld leakage points.
- Integrally forged in one piece, combining the branch outlet, connecting nipple, and high-pressure union into a single unit, with only one weld on the main pipe side, reducing on-site welding operations and hidden leakage risks
- Comes with MSS SP-97 equal-area reinforcement, no additional reinforcement pad needed after opening, providing a basis for engineering acceptance
- The branch end integrates an MSS SP-83 standard high-pressure union, allowing instruments, sampling valves, and drain components to be quickly disassembled and assembled, without the need to cut the pipeline or disassemble welds
- Pressure ratings cover 3000LB and 6000LB, main pipe NPS2-NPS48, branch NPS1/8-NPS2, compatible with wall thicknesses such as STD, XS, SCH80, SCH160, XXS
- Sealing forms are divided into US metal spherical hard seal and UG gasket soft seal, which can be selected according to high-temperature high-pressure or normal-temperature clean working conditions
- Materials cover carbon steel, low-temperature steel, stainless steel, chrome-molybdenum alloy steel, duplex steel, and nickel-based alloys, supporting NPT, BSPT, RC and other thread standards
| Product Name | Weldolet |
| Product Category | Contact us to confirm |
| Standard | MSS SP‑97, MSS SP‑83, ASME B16.11, GB/T19326, GB/T14383; pressure ratings: 3000LB conventional high pressure, 6000LB ultra-high pressure thickened; compatible wall thicknesses: STD, XS, SCH80, SCH160, XXS full series high-pressure wall thicknesses; diameter range: main pipe NPS2‑NPS48, branch NPS1/8‑NPS2; sealing structure: US metal spherical hard seal, UG gasket soft seal; thread standards: NPT American tapered thread, BSPT British tapered thread, RC pipe thread; structure types: equal-diameter union branch outlet, reducing union branch outlet, ultra-high pressure thickened reinforced type; forming process: integral |
| Customization | Our factory possesses full-dimensional high-end non-standard customization capabilities for Unionolet union branch outlet fittings, and can comprehensively meet the supporting needs of high-pressure quick-disassembly instrument piping networks at home and abroad, special sealing working conditions, renovation of old imported pipelines, and overseas non-standard project supporting requirements. We can customize any non-standard reducing ratio, extra-large main pipe with extremely small instrument branch, 6000LB ultra-high-pressure thickened and reinforced union branch outlet fittings, suitable for ultra-high-pressure, high-temperature, and highly corrosive severe instrument working conditions. We support full-thread system customization, and NPT, BSPT, RC, and G thread forms can be machined on demand, precisely adapting to the connection of high-end imported instruments, transmitters, and valve parts from various countries. We support exclusive customization of sealing structures, can finely adjust spherical arc curvature, customize special high-temperature-resistant gaskets, and reinforced hard sealing structures, adapting to extreme temperature differences and high-frequency |
| MOQ | Our factory's Unionolet union branch outlet fittings adopt a flexible low-threshold minimum order mechanism for foreign trade, adapting to large and small batch procurement of high-end heavy industry at home and abroad, with flexible ordering and no mandatory threshold. For conventional carbon steel A105, stainless steel 304/316L 3000LB/6000LB mainstream NPT/BSPT threaded, US/UG standard sealing styles, the MOQ is as low as |
| Lead Time | Our factory regularly stocks a massive inventory of Unionolet union branch outlet fittings in national standard and American standard conventional pressure, conventional thread, and conventional sealing structures. Carbon steel and stainless steel US hard sealing and UG soft sealing mainstream styles are sufficiently stocked. In-stock orders are shipped extremely fast within 24 hours, quickly responding to overseas high-end heavy industry urgent orders, instrument piping network emergency repairs, explosion-proof point renovations, project rush work, and construction period |
| Packaging | Our factory's Unionolet union branch outlet fittings, as precision quick-disassembly forged instrument pipe fittings, adopt foreign trade heavy-industry-grade refined full-protection export packaging, focusing on protecting the saddle fitting arc surface, union precision sealing spherical surface, thread form, and precision mating surface of the locking nut, preventing transportation collisions, spherical surface scratches, thread stripping, sealing surface wear, and impurity hole blockage. All products undergo professional anti-rust treatment before leaving the factory. Carbon steel parts are sprayed with long-acting industrial anti-rust oil, sealing the metal surface to isolate oxidation and corrosion; stainless steel parts undergo pickling passivation and mirror-surface decontamination treatment, capable of withstanding high-humidity salt spray environments of ocean shipping, preventing re-rusting and oxidation. The union sealing spherical surface is equipped with a dedicated dust-proof protective cover, threaded ports wear thickened thread protector caps, and locking nuts are individually isolated and protected to avoid mating surface collision |
| Reference Price | Inquiry |
Applications
- Branch points for pressure gauges, pressure transmitters, and sampling valves that need frequent disassembly and assembly on petrochemical high-pressure process pipelines
- Quick-install maintenance interfaces for pressure gauges on steam piping networks of thermal power plants, and steam branches that require online instrument replacement
- Branch connections for instrument transmitters and blowdown components in coal chemical explosion-proof devices, where open flames or pipeline cutting are prohibited on site
- Quick-disassembly blowdown branches for natural gas high-pressure pipelines, and instrument interfaces that require regular calibration and repeated disassembly and assembly
- Occasions such as offshore platform salt-spray anti-corrosion instrument piping networks and fine chemical clean media monitoring points that have requirements for sealing and ease of disassembly and assembly
Overview
The Union-olet is a branch pipe fitting that combines a branch outlet, a connecting nipple, and a high-pressure union into a single forged piece. The saddle base is welded flush against the outer wall of the main pipe, leaving only one weld on the main pipe side; the branch end comes with an MSS SP-83 standard high-pressure union, which can directly connect to instrument equipment such as pressure gauges, thermometers, sampling valves, drain valves, and pressure transmitters. The body reinforcement structure follows MSS SP-97; the union sealing and threads implement ASME B16.11 and MSS SP-83, with domestic equivalents GB/T19326 and GB/T14383. It is mainly used on high-pressure small-diameter instrument lines in petrochemical, thermal power, coal chemical, oil and gas, and other industries, and is suitable for branch points that require frequent disassembly, online rapid maintenance and replacement of instruments, sampling valves, and drain components.
Key Features
First, integrally forged and formed, three functions combined into a single piece, eliminating two welding steps on site and reducing leakage hazards from the source. Second, it comes with MSS SP-97 equal-area reinforcement, so no additional reinforcement pad is needed after opening, and project acceptance has a basis to rely on. Third, the branch end integrates a standard high-pressure union, allowing instruments and valve components to be quickly unscrewed and disassembled without cutting the pipeline or removing welds. Fourth, pressure ratings cover 3000LB and 6000LB, with diameters covering main pipe NPS2-NPS48 and branch NPS1/8-NPS2, adapting to a variety of high-pressure wall thicknesses. Fifth, sealing forms are divided into US metal spherical hard sealing and UG gasket soft sealing, selectable according to working conditions. Sixth, materials cover carbon steel, low-temperature steel, stainless steel, chrome-molybdenum alloy steel, duplex steel, and nickel-based alloys, and support thread systems such as NPT, BSPT, and RC.
Applications
The Union-olet is mainly aimed at high-pressure instrument branch points, especially occasions requiring high-frequency disassembly and assembly, online maintenance, explosion-proof no-hot-work restrictions, narrow pipe rack space, and reduced weld leakage points. Typical scenarios include pressure gauge, pressure transmitter, and sampling valve branches on petrochemical high-pressure process pipelines; quick-install maintenance interfaces for pressure gauges on thermal power plant steam pipe networks; instrument transmitter branches in coal chemical explosion-proof units; quick-release drain branches on natural gas high-pressure pipelines; offshore platform salt-spray anti-corrosion instrument piping networks and fine chemical clean media monitoring points. For batch matching of new high-pressure quick-release instrument piping networks, as well as renovation of old split union branches, configuration can also be confirmed according to project requirements.
Specifications
The implemented standards are MSS SP-97, MSS SP-83, ASME B16.11, GB/T19326, and GB/T14383. Pressure ratings are divided into 3000LB conventional high pressure and 6000LB ultra-high-pressure thickened. Main pipe diameters are NPS2-NPS48, and branch diameters are NPS1/8-NPS2. Applicable wall thicknesses include STD, XS, SCH80, SCH160, and XXS. Sealing structures are divided into US metal spherical hard sealing and UG gasket soft sealing. Thread systems support NPT American tapered thread, BSPT British tapered thread, and RC pipe thread. Materials include carbon steel A105, LF2 low-temperature steel, 304/316L stainless steel, F11/F22 chrome-molybdenum alloy steel, 2205 duplex steel, and nickel-based alloys. Structural types include equal-diameter Union-olet, reducing Union-olet, and ultra-high-pressure thickened reinforced type. For specific specification selection, please contact us for confirmation.
Purchase & Delivery
We routinely stock Union-o-lets in national standards, American standards, conventional pressure, conventional threads, and conventional sealing structures. Mainstream styles of carbon steel, stainless steel US hard sealing, and UG soft sealing are sufficiently stocked, and in-stock orders can be responded to quickly. For minimum order quantity, delivery time, and packaging details, please contact us for confirmation. Packaging uses foreign-trade heavy-industry-grade protection: carbon steel parts are sprayed with industrial anti-rust oil, and stainless steel parts are pickled and passivated; the union sealing spherical surface is fitted with a dust-proof protective sleeve, and threaded ports are fitted with thread protectors; individual pieces are wrapped in bubble film and pearl cotton, small and medium specifications are packed in thickened moisture-proof cartons, and large-diameter heavy-duty styles are packed on fumigated solid wood pallets. The outer packaging is marked with sealing type, thread system, pound rating, specification, material, batch, and export shipping marks, and supports neutral unmarked and LOGO private labeling.
Service & Support
We provide Union-olet selection guidance, welding and installation process recommendations, sealing commissioning and maintenance plans, and high-frequency disassembly and assembly maintenance recommendations. Before leaving the factory, products undergo appearance screening, saddle arc surface inspection, union spherical sealing calibration, thread precision verification, and a full set of non-destructive testing. If after receiving the goods customers encounter problems such as original factory quality defects, wrong specifications shipped, poor sealing, jamming during disassembly and assembly, poor thread fit, transportation deformation, or pressure leakage, please contact us, and we will assist in confirmation and handling. We support long-term customer inventory custody, partial shipments, replenishment on demand, and price-locked stocking. In terms of customization, we can do non-standard reducing, oversized main pipe paired with extremely small instrument branch, 6000LB ultra-high-pressure thickened reinforced type, all thread systems, fine-tuning of sealing structure, thickened body, non-standard saddle arc surface, micro eccentric structure, as well as surface processes such as heavy anti-corrosion and anti-rust, hot-dip galvanizing, stainless steel mirror polishing, and pickling and passivation, and can also perform reverse customization based on overseas drawings or old imported dismantled pipe fittings.
FAQ
What is the difference between a Union-olet and an ordinary threaded branch outlet?
Ordinary threaded branch outlets often require disassembling valves or pipelines when instruments are being installed or removed, whereas union branch outlets combine the branch outlet, connecting nipple, and high-pressure union into a single forged piece. The branch end comes with a standard high-pressure union, so instruments and valves can be directly unscrewed for installation and removal without cutting pipelines or dismantling welds. Only one welding seam is retained on the main pipe side, resulting in fewer on-site welding steps.
How to choose between US metal spherical hard seal and UG gasket soft seal?
For high-temperature and high-pressure, steam, oil and gas, and explosion-proof gasket-free working conditions, generally choose US metal spherical hard seal; for normal temperature, aqueous phase, clean media, and slight corrosion working conditions, generally choose UG gasket soft seal. The specific selection needs to be combined with the medium, temperature, pressure, and frequency of installation and removal. Please contact us to confirm.
What pressure ratings and bore diameters does the union branch outlet support?
Pressure ratings cover 3000LB and 6000LB, main pipe bore diameters NPS2-NPS48, branch bore diameters NPS1/8-NPS2, and it is compatible with wall thicknesses such as STD, XS, SCH80, SCH160, and XXS. If the project has special bore diameter or wall thickness requirements, please contact us to confirm.
Can union branch outlets be customized?
Yes. We support non-standard reducing, oversized main pipes paired with extremely small instrument branches, 6000LB ultra-high-pressure thickened and reinforced type, fully threaded system customization, fine-tuning of the sealing structure, thickened body, non-standard saddle curved surface, miniature eccentric structure, as well as surface processes such as heavy-duty anti-corrosion and rust prevention, hot-dip galvanizing, stainless steel mirror polishing, and pickling and passivation. We can also perform reverse customization based on overseas drawings or old imported dismantled pipe fittings.
How to confirm the minimum order quantity, delivery time, and packaging?
We keep in stock branch outlet fittings with standard pressure, standard threads, and standard sealing structures, enabling quick response for in-stock orders. For specific minimum order quantities, lead times, and packaging details, please contact us to confirm; we will assist with quotations based on specifications, materials, quantities, and destination.
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