Efficient Branch Piping Systems
Nipoflange is a connection that has a flange on one side and a nipolet on the other side.
Efficient Branch Piping Systems
Nipoflange is a connection that has a flange on one side and a nipolet on the other side.
A Nipo flange is used in the pipe industry like a weldoutlet or a nipoutlet for a 90° branch connection. A Nipoflange is a combination of weldoutlet , nipoutlet and flange.
These Weld Neck Flanges are available in sizes from 1/2” to 60”, with pressure ratings from Class 150 to 2500 and temperature tolerance up to 600°C, depending on material.
Nipo Flanges are forged as a single piece, ensuring leak-proof performance, with coatings like 3LPE or FBE enhancing corrosion resistance for harsh environments as of August 2025.
Compared to standard flanges, Nipo Flanges streamline installation with a single-piece design, offering a service life of 20–40 years with proper maintenance and protection.
Nipo Flanges address challenges like complex branch connections and pipeline integrity, providing reliable solutions for industrial piping as of August 22, 2025.
Nipoflange Overview
A nipoflange is a specialized pipe fitting combining a weldoutlet, nipoutlet, and flange for 90° branch connections in piping systems.
A nipoflange is a forged fitting used in the pipe industry for 90° branch connections, integrating the features of a weldoutlet, nipoutlet, and flange. On the run pipe side, it is designed like a weldolet, providing a welding connection, while the other side features a flange connection customizable to standards like ASME B16.5 or DIN. This single-piece, forged design eliminates welding seams, enhancing strength and reliability for applications in oil and gas, chemical processing, and water treatment.
Manufactured from materials like carbon steel, stainless steel, or alloys (e.g., ASTM A105, A182 F304), nipoflanges undergo rigorous testing, including chemical composition and pressure tests, to ensure compliance with standards like ANSI B16.9 and MSS-SP-97. Available in sizes from 1/2″ to 48″ and pressure ratings from Class 150 to 2500, they offer flexibility for high-pressure systems, refineries, and infrastructure projects, providing a robust solution for branch connections.
Nipoflanges deliver durable, leak-proof branch connections, combining versatility and strength for industrial piping systems.
| Standard Specification | Primary Application & Material/Size Scope |
|---|---|
| ASME B16.5 | American standard for pipe flanges and flanged fittings, covering NPS 1/2" to 24" (DN 15 to 600) — compatible with ASME B36.10/B36.19 pipes for industrial piping systems. |
| ASTM A105 | Forged carbon steel material standard for pressure-containing flanges; suitable for general-temperature industrial applications (e.g., water, oil, gas pipelines) with good mechanical strength. |
| ASTM A350 LF2 | Low-temperature carbon steel for flanges (service temp: -50°C to 400°C); meets impact toughness requirements (20 J at -46°C per ASTM E23) — ideal for cold-region or cryogenic piping (e.g., refrigeration, LNG). |
| ASTM A182 | High-temperature alloy steel flanges (e.g., F11, F22, F304, F316); resistant to oxidation and creep at elevated temps — used in power plants, petrochemical heaters, and high-temperature process lines. |
| ASTM A694 | High-yield strength carbon/manganese alloy steel for high-pressure transmission flanges (e.g., oil/gas gathering lines, offshore pipelines); grades include F42 to F80, matching high-pressure class (Class 600+). |
| DIN EN 1092-1 | European standard for flanges, specifying PN (Pressure Nominal) classes 2.5 to 400 (equivalent to ASME Class 150 to 2500); widely used in EU/Asia, compatible with DIN/EN pipe systems (e.g., DIN 2448). |
They can remain original in up to 870 degrees Celsius; meaning, they can withstand high temperatures without losing the strength and corrosion resistance properties. There are many makes such as the Reinforced Nipoflange which is a nickel alloy flange. They are used in many other industries such as the sea water cooling systems, wiring components in electrostatic precipitators, oil refineries acetic acid industry, architectural structures such as railings and many more. The mechanical properties of these flanges make them oxidation resistant.The different compositions are used to match with the differently alloyed pipelines and to match the strength and pressure requirements of the applications.
A combination of weldneck flange and nipolet is a nipoflange. Nipoflange is shaped like a nipolet on the run side and has a flange connection on the branch size.
| Industry Sector | Specific Application Scenarios & Nipoflange Requirements |
|---|---|
| Oil and Gas |
• Pipelines (Crude Oil/Gas Transmission): Stainless steel Nipoflanges (e.g., ASTM A182 F316) are used for onshore/offshore pipelines, resisting corrosion from saline environments and hydrocarbon impurities. • Wellhead & Processing Facilities: High-pressure Nipoflanges (ASME B16.5 Class 300/600) adapt to wellhead pressure fluctuations and high-temperature fluid processing. |
| Chemical Industry |
• Corrosive Fluid Handling: Duplex/super duplex steel Nipoflanges (e.g., ASTM A182 F51) or nickel-alloy (Hastelloy) Nipoflanges are used for acids (sulfuric acid, hydrochloric acid) and solvent pipelines, preventing material degradation. • Reactor & Tank Connections: Nipoflanges with tight-seal designs (raised face/RF) ensure no leakage of toxic or flammable chemicals, complying with safety standards (e.g., API 598). |
| Plumbing (Commercial/Civil) |
• Building Water/Gas Piping: Alloy steel Nipoflanges (e.g., ASTM A350 LF2) or carbon steel (ASTM A105) Nipoflanges are used for indoor plumbing, balancing cost-effectiveness and resistance to tap water corrosion. • HVAC Systems: Low-pressure Nipoflanges (Class 150) connect heating/cooling water pipelines, ensuring stable fluid circulation. |
| Heating Systems |
• District Heating Networks: Carbon steel Nipoflanges (ASTM A105) with anti-corrosion coatings (epoxy) are used for high-temperature hot water (≤120°C) transmission pipelines, resisting scale buildup and thermal stress. • Residential Boilers: Small-diameter Nipoflanges (NPS 2-4) connect boiler outlets to heating pipes, ensuring tight sealing to prevent steam leakage. |
| Water Supply Systems |
• Municipal Water Treatment: Carbon steel Nipoflanges (ASTM A105) or 304 stainless steel Nipoflanges are used for raw water, treated water, and sewage pipelines, adapting to chlorine disinfection environments. • Desalination Plants: Stainless steel Nipoflanges (F316L) resist seawater corrosion in reverse osmosis (RO) water supply lines. |
| Power Plants (Thermal/Nuclear) |
• Thermal Power: High-temperature alloy Nipoflanges (e.g., ASTM A182 F22) are used for boiler steam pipelines (≤550°C) and turbine connections, complying with ASME B16.5 for dimensional accuracy. • Nuclear Power: Nickel-alloy (Inconel) or titanium Nipoflanges are used in reactor cooling systems, resisting radiation-induced material fatigue and high-pressure coolant (water/helium) erosion. |
| Paper and Pulp Industry |
• Pulp Processing Lines: Nipoflanges with wear-resistant materials (e.g., alloy steel with hard chrome plating) are used for wood pulp, black liquor, and bleaching agent (chlorine dioxide) pipelines, preventing abrasion from pulp fibers. • Drying Section: High-temperature Nipoflanges (Class 150/300) connect steam-heated drying cylinders, ensuring stable heat transfer for paper production. |
| Food Processing Industry |
• Hygienic Piping (Dairy/Beverages): 304/316L stainless steel Nipoflanges (ASTM A182) with smooth surfaces (polished to Ra ≤ 0.8 μm) are used, complying with FDA/USDA standards to avoid food residue and bacterial growth. • Canning & Brewing: Nipoflanges with sanitary gaskets (silicone/EPDM) connect fruit juice, beer, or canned food processing lines, ensuring no contamination of edible products. |
| Manufacturing Industry |
• Automotive/Aerospace: Small-diameter Nipoflanges (NPS 1/2-2) connect hydraulic oil, coolant, or fuel pipelines in production equipment, ensuring precise fluid control for machining processes. • Heavy Machinery: Carbon steel Nipoflanges (ASTM A105) are used for construction machinery (excavators, cranes) hydraulic systems, withstanding vibration and mechanical stress. |
| Structural Pipes |
• Industrial Buildings/Steel Structures: Carbon steel Nipoflanges (ASTM A105) connect structural support pipes (e.g., for scaffolding, equipment frames) or fire-fighting pipelines, balancing load-bearing capacity and corrosion resistance (with galvanized coatings). • Offshore Platforms: Corrosion-resistant Nipoflanges (stainless steel or coated carbon steel) connect structural pipes, adapting to marine salt spray environments. |
| General Purpose Applications |
• Low-Pressure Fluid Transfer: Carbon steel Nipoflanges (Class 150) are used for non-corrosive fluids (air, freshwater) in workshops, warehouses, or small-scale processing facilities, prioritizing cost-effectiveness. • Equipment Maintenance: Standardized Nipoflanges (ASME B16.5) serve as replacement parts for aging pipelines or machinery, ensuring compatibility with existing systems. |
Nipo flange olet
A flange-olet (flange-outlet) is also called nipoflange or weldoflange,its shape looks like a Long weld neck flange.It could be regarded as a combination of a long weld neck flange and a weldolet,or a nipolet welded with a weld neck flange.
The flange-olet is used for a 90° branch connection from a main pipe.On the run pipe side,the flangeolet is designed like a weldolet,it will welded with the run pipe as a branch of the pipe.On another side,the flange-olet is a flange connection,this flange dimensions could be designed as per EN1092,ASME/ANSI B16.5 standard or other codes.
The flange-olet is produced in forging and machining process,it is forged material,commonly the flange-olet is a integral forging without any welding seam.
The flange-olet could be in forged carbon steel material,stainless steel material or alloy steel material.
The most common type, featuring a raised sealing surface that concentrates the bolting force on a smaller area.
Has a flat sealing surface, commonly used with cast iron flanges and for low-pressure applications.
Features a groove for metal ring gaskets (oval or octagonal), providing metal-to-metal sealing.
Features matching tongue and groove surfaces, providing self-alignment and confined gasket area.
Flange faces have to be smooth enough to ensure a tight, leak-free seal for bolted flanges.
| Flange Face Type | Flange Face Type | Flange Face Type |
|---|---|---|
| Type A: flat face | Type D: groove face | Type G: O Ring recess |
| Type B: raised face | Type E: spigot | Type H: O Ring groove |
| Type C: tongue face | Type F: recess |
| ASME B16.5 | Pipe Flanges NPS 1/2 - 24 |
| ASTM A105 | Forged Carbon Steel |
| ASTM A350 LF2 | Low-Temperature Service |
| ASTM A182 | High-Temperature Service |
| ASTM A694 | High-Pressure Transmission |
| DIN EN 1092-1 | European Standard PN 2.5-400 |
Most commonly used, forged with machined surfaces
Corrosion resistant, grades 304, 316, etc.
High-temperature and high-pressure applications
Cast iron, aluminum, brass, bronze, plastic
| Material Category | Fittings (ASTM Grade) | Flanges (ASTM Grade) | Valves (ASTM Grade) | Bolts & Nuts (ASTM Grade) |
|---|---|---|---|---|
| Carbon Steel | A234 Gr WPA | A105 | A216 Gr WCB | A193 Gr B7 A194 Gr 2H |
| A234 Gr WPB | A105 | A216 Gr WCB | ||
| A234 Gr WPC | A105 | A216 Gr WCB | ||
| Carbon Steel
Alloy (High-Temperature) |
A234 Gr WP1 | A182 Gr F1 | A217 Gr WC1 | A193 Gr B7 A194 Gr 2H |
| A234 Gr WP11 | A182 Gr F11 | A217 Gr WC6 | ||
| A234 Gr WP12 | A182 Gr F12 | A217 Gr WC6 | ||
| A234 Gr WP22 | A182 Gr F22 | A217 Gr WC9 | ||
| A234 Gr WP5 | A182 Gr F5 | A217 Gr C5 | ||
| A234 Gr WP9 | A182 Gr F9 | A217 Gr C12 | ||
| Carbon Steel
Alloy (Low-Temperature) |
A420 Gr WPL6 | A350 Gr LF2 | A352 Gr LCB | A320 Gr L7 A194 Gr 7 |
| A420 Gr WPL3 | A350 Gr LF3 | A352 Gr LC3 | ||
| Austenitic Stainless Steel | A403 Gr WP304 | A182 Gr F304 | A182 Gr F304 | A193 Gr B8 A194 Gr 8 |
| A403 Gr WP316 | A182 Gr F316 | A182 Gr F316 | ||
| A403 Gr WP321 | A182 Gr F321 | A182 Gr F321 | ||
| A403 Gr WP347 | A182 Gr F347 | A182 Gr F347 |
ASTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".
The usual materials of flanges include stainless steel, carbon steel, aluminum and plastic. The choice of the material largely depends on the purpose of the flange. For example, stainless steel is more durable and is necessary for heavy use. On the other hand, plastic is more feasible for use in the home because of its reasonable price and easy installation. The materials used for flanges are under the designation of the American Society of Mechanical Engineers.
The most common materials for pipe flanges (forged grades) are: ASTM A105 (carbon steel high temperature to match A53/A106/API 5L pipes), A350 Grades LF1/2/3 (carbon steel low temperature to match A333 pipes), A694 Grades F42 to F80 (high yield carbon steel to match API 5L pipe grades), ASTM A182 Grades F5 to F91 (alloy steel flanges to match A335 pipes), A182 Grade F304/316 (stainless steel flanges to match A312 SS pipes), A182 Gr. F44/F51/F53/F55 (duplex and super duplex to match A790/A928 pipes) and various nickel alloy grades (Inconel, Incoloy, Hastelloy, Monel).
The material qualities for these flanges are defined in the ASTM standards.
Metal flanges are classified from 150 to 2500 # rating for different pressure applications.
Incoloy 825 Flange
Industries Using
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