WOL Weldolet
The WOL butt-welded branch outlet is a dedicated butt-welded branch fitting for non-destructive hot tapping on high-pressure main pipelines, featuring self-contained equal-area reinforcement. Its core application is to directly draw a 90° p
Inquiry
- The core advantages of the WOL welded branch outlet are integral forging forming, built-in equal-area reinforcement, butt welding strength equal to that of the main pipe, zero stress hidden dangers, permanent safety, and lower overall cost.
- Its performance comprehensively surpasses traditional tees and on-site opening reinforcement processes. One-piece die forging has no spliced welds, no sand holes or air pores, and a dense and uniform material structure.
- Structural strength, pressure resistance, high-temperature resistance, and fatigue resistance far exceed those of welded and spliced pipe fittings.
- It can withstand ultra-high pressure, high-temperature alternating conditions, and frequent load impacts over the long term. The saddle arc surface precisely fits the main pipe.
- Uniform stress distribution after welding
Detailed Introduction
WOL Weldolet is an integrally forged fitting we provide for high-pressure heavy-industry pipeline branch requirements. The saddle-shaped arc surface of the main pipe fits closely against the outer wall of the main pipe, and the branch pipe end is machined with a standard bevel for full-penetration butt welding with the branch pipe. After welding, equal-area reinforcement is formed, with no need for additional reinforcing pads and no need to cut off the main pipe. Products cover carbon steel A105, low-temperature steel LF2, stainless steel 304/316L, alloy steel F11/F22, duplex steel, and nickel-based alloys, with pressure ratings of 3000LB and 6000LB, and wall thickness grades of STD, XS, SCH80, SCH160, and XXS. They are commonly used in pipeline locations such as petrochemical process branch lines, steam bypass lines, circulation pipelines, and bypass pipelines that operate continuously over the long term under high-temperature cyclic conditions. For specific size, material, and pressure class combinations, please contact us to confirm.
- Integrally hot-forged in one piece, with no spliced welds, dense and uniform material, suitable for high-pressure thick-wall main pipe branches
- The saddle-shaped arc surface precisely fits the outer wall of the main pipe, achieving opening stress reinforcement after welding, with no need for additional reinforcing pads
- The branch pipe end is full-penetration butt welded, providing strong connection rigidity, smooth flow passage, and reducing medium transportation resistance and scaling risks
- Covers NPS2-NPS48 main pipes and NPS1/2-NPS24 branch pipes, with two pressure ratings: 3000LB and 6000LB
- Material options include carbon steel A105, low-temperature steel LF2, stainless steel 304/316L, alloy steel F11/F22, duplex steel, and nickel-based alloys
- Supports customization for non-standard reducing, extended neck, special bevel angles, thickened body, and surface treatment, and can be reverse-customized according to drawings
| Product Name | WOL Weldolet |
| Category | Contact us to confirm |
| Standard | MSS SP‑97, ASME B16.9, GB/T19326; pressure rating: 3000LB, 6000LB; compatible wall thickness: STD, XS, SCH80, SCH160, XXS thickened grades; structural types: equal-diameter WOL, reducing WOL, extended-neck WOL, high-pressure thickened WOL; connection method: main pipe fitting fillet welding, branch pipe end full-penetration butt welding; forming process: integral hot forging in one piece, precision machining; inspection standards: 100% UT ultrasonic, MT magnetic particle, PT penetrant non-destructive testing; diameter range: main pipe NPS2‑NPS48, branch pipe NPS1/2‑NPS24; working temperature: carbon steel ‑20℃~450℃, stainless steel ‑1 |
| Customization | This factory possesses full-dimensional heavy-industry high-end non-standard customization capabilities for WOL butt-welded branch outlets, and can comprehensively meet the supporting needs of high-pressure heavy industry, special working conditions, old pipeline network renovation, and overseas non-standard projects at home and abroad. It can customize any non-standard reducing ratio, extra-large-diameter main pipe branches, and ultra-high-pressure thickened and reinforced WOL butt-welded branch outlets, adapting to ultra-high-temperature and ultra-high-pressure harsh process working conditions. It supports structural customization, including extended-neck insulation-specific models, unequal-sided special curved surfaces, non-standard bevel angles, and thickened body reinforcement structures, adapting to on-site special construction and insulation needs. It supports special surface process customization, including heavy-duty anti-corrosion and anti-rust, hot-dip galvanizing, stainless steel mirror fine polishing, and pickling and passivation treatment, adapting to outdoor salt spray and strongly corrosive humid heavy-industry environments. It can, according to overseas project drawings and old |
| MOQ | Our factory's WOL weld-on branch outlet adopts a flexible low-threshold minimum order mechanism for foreign trade, adapting to the procurement needs of large, medium, and small heavy industry buyers both domestically and overseas, with flexible ordering and no mandatory threshold. For mainstream specifications such as conventional carbon steel A105 3000LB/6000LB equal diameter and reducing, the MOQ is as low as 1 piece, which can fully satisfy engineering trial samples, point addition on high-pressure main pipeline networks, and renovation and repair of old high-risk pipelines. |
| Lead Time | Our factory maintains massive ready stock of WOL butt-welded branch outlets in national standard and American standard conventional pressure ratings and conventional diameters, with ample inventory of mainstream equal-diameter and reducing styles in carbon steel and stainless steel. In-stock orders are shipped within 24 hours at express speed, quickly responding to procurement needs of overseas heavy industry urgent orders, high-pressure pipeline network emergency repairs, project rush work, and tight schedules. For conventional standard batch orders, we have our own forging, precision machining, and non-destructive testing |
| Packaging | Our factory's WOL welded branch outlet, as a high-end heavy-industry precision-forged high-pressure pipe fitting, adopts refined heavy-industry-grade protective packaging for foreign trade export, with emphasis on protecting the saddle curved surface, welding groove, and precision-turned end face, eliminating problems such as transportation collisions, scratches, rust, deformation, and precision damage. All products undergo professional anti-rust treatment before leaving the factory; carbon steel parts are sprayed with industrial long-acting anti-rust oil to seal and protect the metal surface; stainless steel parts undergo pickling and passivation and deoxidation treatment to eliminate marine salt spray corrosion. Special anti-vibration protective rubber pads are pasted on the welding groove and arc-shaped fitting surface to prevent wear and indentation on precision working surfaces; ports are sealed against dust to prevent impurities from entering the flow channel. Each piece is individually wrapped with thickened bubble film and pearl cotton for all-around cushioning, isolating friction damage and stacking pressure. Small and medium specifications are classified and packed into thickened |
| Reference Price | Inquiry |
Applications
- Lead out process branch lines, circulation lines, or bypass pipelines from the high-pressure main process pipeline network of petroleum refining
- Adding branch points on main steam piping in thermal power plants
- Branch connections for long-distance high-pressure natural gas trunk pipelines and oil and gas transportation pipeline networks on offshore platforms
- In high-pressure reaction process pipelines of coal chemical industry, replacing traditional reducing tees or on-site hole-opening reinforcement processes
- New construction, renovation, and addition of points for urban ultra-high-pressure heating main pipelines and heavy-industry high-pressure circulation pipe networks
Overview
A WOL butt-weld branch outlet is a 90° butt-weld branch fitting formed by integral forging. The main pipe side has a saddle-curved surface that fits against the outer wall of the main pipe and is then welded; the branch end is machined with a standard bevel for full-penetration butt welding with the branch pipe. After welding is completed, the body of the branch outlet forms equal-area reinforcement at the opening location, with no need for additional reinforcement pads and no need to cut the main pipe. The product complies with MSS SP-97, ASME B16.9, and GB/T19326 standards. Main pipe nominal sizes cover NPS2 to NPS48, branch nominal sizes cover NPS1/2 to NPS24, pressure ratings are 3000LB and 6000LB, and wall thickness schedules cover STD, XS, SCH80, SCH160, and XXS. In terms of materials, carbon steel A105, low-temperature steel LF2, stainless steel 304/316L, alloy steel F11/F22, duplex steel, and nickel-based alloys can be provided.
Key Features
Integrally hot-forged in one piece, with no spliced weld seams, the material is dense and uniform, making it suitable for branch connections on high-pressure, thick-wall main pipes. The saddle-curved surface fits precisely against the outer wall of the main pipe, and after welding the stress distribution is uniform, forming reinforcement at the opening location and reducing the weld fatigue problems commonly found in the traditional process of opening a hole and adding a reinforcement pad. The branch end is full-penetration butt welded, giving strong connection rigidity, a smooth flow passage, low resistance to medium conveyance, and resistance to fouling. During installation, there is no need to cut the main pipe, no need to add reinforcement pads, and no need for secondary reinforcement, so the construction process involves fewer steps than traditional reducing tees or on-site hole-opening solutions. The product covers multiple materials and pressure ratings, and the specific configuration can be confirmed according to project drawings and operating conditions.
Applications
WOL butt-weld branch outlets are mainly used for branch takeoff from high-temperature, high-pressure, thick-wall main pipes and pipelines carrying highly hazardous media. Typical scenarios include high-pressure main process pipe networks in petroleum refining, high-pressure trunk pipelines for long-distance natural gas transmission, high-temperature steam thermal systems in thermal power plants, high-pressure reaction process pipelines in coal chemical engineering, oil and gas transmission networks on offshore platforms, ultra-high-pressure urban heating trunk pipelines, and high-pressure circulation networks in heavy industry. They are suitable for working conditions involving large-diameter thick-wall main pipes, alternating pressure loads, long-term continuous operation, and flammable, explosive, or highly corrosive media. For main pipe layouts where conventional tees are unsuitable and on-site hole opening carries high safety risks, WOL butt-weld branch outlets are a common alternative solution. They are not suitable for civil low-pressure water supply and drainage or ordinary light-duty HVAC pipe networks.
Specifications
The applicable standards are MSS SP-97, ASME B16.9, and GB/T19326. Main pipe nominal sizes are NPS2-NPS48, and branch nominal sizes are NPS1/2-NPS24. Pressure ratings are 3000LB and 6000LB. Wall thickness schedules are STD, XS, SCH80, SCH160, and XXS. Materials cover carbon steel A105, low-temperature steel LF2, stainless steel 304/316L, alloy steel F11/F22, duplex steel, and nickel-based alloys. Structural types include equal-diameter WOL, reducing WOL, extended-neck WOL, and high-pressure thickened WOL. Connection methods are fillet welding with the main pipe fitted against it and full-penetration butt welding at the branch end. Forming processes are integral hot forging in one piece and precision machining. Nondestructive testing standards are 100% UT ultrasonic testing, MT magnetic particle testing, and PT penetrant testing. Regarding working temperature, carbon steel is -20℃ to 450℃; for the specific temperature ranges of stainless steel and other materials, please contact us for confirmation.
Purchase & Delivery
For conventional carbon steel A105 3000LB/6000LB equal-diameter and reducing mainstream specifications, the MOQ is as low as 1 piece, which can meet the needs of engineering samples, additional point installation, and pipeline modification replacement parts. We maintain stock of conventional Chinese-standard and American-standard pressure ratings and conventional diameters, with ample inventory of mainstream carbon steel and stainless steel equal-diameter and reducing styles; in-stock orders ship within 24 hours. For conventional standard batch orders, the delivery date is arranged according to the production schedule; please contact us for confirmation of the specific delivery date. Packaging uses export heavy-industry-grade protection: carbon steel parts are sprayed with industrial anti-rust oil, and stainless steel parts are pickled and passivated; bevels and curved fitting surfaces are affixed with shock-absorbing protective rubber pads, and ports are sealed against dust; individual pieces are wrapped in bubble film and pearl cotton, small and medium specifications are packed in thickened moisture-proof cartons, and large diameters use fumigated solid wood pallets with steel strapping and waterproof film covering. We support neutral unbranded packaging, customer LOGO private labeling, and custom engineering shipping marks.
Service & Support
Before leaving the factory, products undergo appearance screening, precision inspection of curved surface accuracy, bevel angle verification, dimensional calibration, and nondestructive testing. If, after receiving the goods, customers encounter problems such as original factory quality defects, wrong specifications shipped, dimensional mismatch, bevel damage, or transport damage, we bear the corresponding responsibility and support free replacement shipment, return or exchange, or re-customization. We can provide selection guidance for high-pressure pipe network branches, WOL welding and installation process plans, bevel treatment guidance, and pipe network branch layout optimization suggestions, and we provide parameter drawings and process documents. We support long-term cooperative customers with inventory consignment management, partial shipments, replenishment on demand, and price-locked stocking services. In terms of customization, we can undertake non-standard reducing ratio combinations, branch takeoff from ultra-large-diameter main pipes, ultra-high-pressure thickened reinforced types, extended-neck insulated versions, non-standard bevel angles, special curved surfaces, and surface treatment customization, and can also perform reverse customization based on overseas project drawings or dismantled pipe fittings.
FAQ
What is the difference between a WOL butt-weld branch outlet and a traditional tee or on-site hole opening plus reinforcement pad?
A WOL butt-weld branch outlet is integrally forged, with the saddle-curved surface on the main pipe side fitted and welded to the outer wall of the main pipe, and the branch end full-penetration butt welded; after welding, equal-area reinforcement is formed, with no need for additional reinforcement pads and no need to cut the main pipe. Compared with traditional reducing tees and the process of on-site hole opening plus reinforcement pad, it has fewer weld seams, a simpler construction process, and a more uniform stress distribution at the opening location.
Under what circumstances should WOL butt-welding branch outlets be selected?
For main pipelines with high temperature and high pressure, long-term continuous operation, flammable and explosive or highly corrosive media, and the need for permanent safe branches, WOL butt-welding branch outlets are usually given priority. They are also suitable for large-diameter thick-wall main pipelines, working conditions with alternating pressure loads, and pipeline sections where installing conventional tees is unsuitable or where on-site drilling poses relatively high safety risks. They are generally not applicable to civil low-pressure water supply and drainage and ordinary HVAC pipe networks.
How should pressure ratings and wall thickness ratings be selected?
For conventional high-pressure working conditions, 3000LB can be selected, while for ultra-high-pressure thick-wall working conditions, the 6000LB thickened version can be selected. Wall thickness ratings cover STD, XS, SCH80, SCH160, and XXS, and need to be matched according to the actual wall thickness ratings of the main pipeline and branch pipeline. For specific selection, please contact us and provide the specifications, materials, pressure ratings, and working conditions of the main pipeline and branch pipeline, and we will assist in confirming.
Can non-standard specifications or special materials be customized?
Yes. We support structural customization such as non-standard reducing ratios, ultra-large-diameter main pipeline branches, ultra-high-pressure thickened and reinforced types, extended-neck insulation types, non-standard bevel angles, special curved surfaces, and thickened bodies, and can also perform reverse customization according to overseas project drawings or dismantled pipe fittings. In terms of materials, 304L, 316L, 2205 duplex steel, low-temperature steel, nickel-based alloys, etc. can be mass-produced. For surface treatment, heavy-duty anti-corrosion and rust-proofing, hot-dip galvanizing, stainless steel mirror polishing, and pickling and passivation are available. For specific customization plans, please contact us for confirmation.
What are the minimum order quantity and delivery time?
For conventional carbon steel A105 3000LB/6000LB equal-diameter and reducing mainstream specifications, the MOQ is as low as 1 piece. We keep in stock Chinese standard and American standard conventional pressure and conventional diameter items, and in-stock orders are shipped within 24 hours. For conventional standard batch orders, the delivery time is arranged according to the production schedule; for the specific delivery time, please contact us for confirmation.
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