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LEOCO offers a comprehensive range of Carbon Steel Flanges for industrial piping and engineering applications, including Blind, Lap Joint, Plate, Slip On, Socket Weld, Threaded, and Weld Neck Flanges. The range is available in various sizes, pressure classes, materials, and configurations to meet diverse project and system requirements.
Our carbon steel flanges are suitable for applications across oil & gas, petrochemical, power, water, construction, and general industrial sectors. With options designed around recognized ASME, EN, DIN, and API standards, LEOCO provides a broad flange selection for reliable connections, equipment interfaces, maintenance, and project procurement.
LEOCO GLOBAL LTD offers a comprehensive range of Carbon Steel Flanges for industrial piping, process systems, oil & gas, petrochemical, power, water, construction, and infrastructure applications. Our flange range includes Carbon Steel Blind Flange, Carbon Steel Lap Joint Flange, Carbon Steel Plate Flange, Carbon Steel Slip On Flange, Carbon Steel Socket Weld Flange, Carbon Steel Threaded Flange, and Carbon Steel Weld Neck Flange, available in different sizes, pressure classes, dimensions, and configurations to meet diverse project requirements.
Carbon steel flanges provide a practical method for connecting pipes, valves, equipment, and other piping components while allowing systems to be assembled, inspected, maintained, and modified when required. Flange selection depends on factors such as pipe size, pressure class, temperature, material grade, facing, connection type, and applicable project standards. ASME B16.5, for example, covers pipe flanges and flanged fittings in NPS ½ through NPS 24 and includes requirements relating to pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing.
A Carbon Steel Blind Flange is designed to close or terminate a piping section, nozzle, valve connection, or equipment opening where no flow-through connection is required. Unlike an open flange, a blind flange has no central bore, allowing it to provide a solid closure at the end of a piping system.
Carbon Steel Blind Flanges are commonly considered for pipeline isolation, maintenance access, pressure systems, vessel connections, and future expansion points. They can also be used where a piping section may need to be opened or extended at a later stage.
A Carbon Steel Lap Joint Flange is used with a separate stub end and is designed to allow the flange to rotate around the pipe connection. This configuration can make bolt-hole alignment more convenient during installation, particularly where frequent assembly and disassembly are required.
Our Carbon Steel Lap Joint Flanges are suitable for piping applications where alignment, maintenance, and repeated flange assembly are important considerations. The appropriate flange and stub-end configuration should be selected according to the piping design and applicable specification.
A Carbon Steel Plate Flange is a flat flange manufactured from carbon steel plate and is used for connecting pipes and other piping components in suitable applications. Its relatively straightforward configuration makes it a practical option for a variety of industrial and general piping requirements.
Carbon Steel Plate Flanges can be specified according to required dimensions, bolt-hole arrangements, pressure requirements, and applicable project standards. Selection should always be based on the design conditions and service requirements of the piping system.
A Carbon Steel Slip On Flange is designed to fit over the outside of a pipe before being welded into position. This flange type is widely used in industrial piping systems where a practical flanged connection is required.
Carbon Steel Slip On Flanges are available in different sizes, pressure classes, facings, and configurations. They are commonly considered for general process piping, water systems, industrial facilities, and other applications where the project specification permits slip-on connections.
A Carbon Steel Socket Weld Flange features a socket into which the pipe is inserted before welding. This design provides a compact flange connection and is commonly associated with smaller-diameter piping applications.
Our Carbon Steel Socket Weld Flanges can be supplied according to required dimensions, pressure ratings, material specifications, and applicable standards. The correct socket weld flange should be selected according to pipe size, service conditions, and engineering requirements.
A Carbon Steel Threaded Flange features internal threads that allow it to connect to a correspondingly threaded pipe without requiring welding at the flange-to-pipe connection. This can make threaded flange connections useful in selected piping applications where welding is not preferred or practical.
Carbon Steel Threaded Flanges are available in different sizes and pressure classes depending on the applicable specification. Thread form, pipe dimensions, pressure requirements, and service conditions should be verified before selection.
A Carbon Steel Weld Neck Flange incorporates a long tapered hub and is designed to be butt-welded to the pipe. Its geometry provides a gradual transition between the flange and pipe, making it a commonly specified flange type for demanding piping applications.
Carbon Steel Weld Neck Flanges are widely considered for process piping, high-pressure systems, high-temperature services, oil & gas facilities, petrochemical plants, and other applications where the project specification requires a welded-neck connection. ASME B16.5 includes welding neck flanges within its covered flange configurations.
LEOCO’s Carbon Steel Flanges can be specified across a broad range of sizes, dimensions, and pressure classes according to the selected flange type and applicable standard. Common pressure-class requirements include Class 150, Class 300, Class 600, Class 900, Class 1500, and Class 2500, subject to the applicable size, standard, and product configuration. ASME B16.5 specifically covers several of these pressure classes for NPS ½ through NPS 24, while ASME B16.47 addresses large-diameter steel flanges from NPS 26 through NPS 60.
Flange selection should not be based on pressure class alone. The required nominal pipe size, flange type, facing, material, wall thickness, temperature, pressure, bolt arrangement, gasket requirements, and applicable standard should be reviewed together.
Depending on the product and project requirement, carbon steel flanges may be specified according to recognized dimensional, material, and manufacturing standards. ASME B16.5 is a key standard for pipe flanges and flanged fittings, covering pressure-temperature ratings, materials, dimensions, tolerances, marking, and pressure testing.
For larger-diameter requirements, ASME B16.47 covers steel flanges in NPS 26 through NPS 60 and includes pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing requirements.
Depending on the project, customers may also specify EN, DIN, API, or other applicable standards. The exact standard should be confirmed from the project’s technical specification before procurement.
Flange facing is another important consideration when selecting a carbon steel flange. The required facing depends on the flange design, gasket arrangement, mating component, pressure-temperature conditions, and applicable standard.
Common flange facing configurations include:
The selected flange facing should be compatible with the mating flange, gasket, and complete bolted joint assembly.
Our Carbon Steel Flanges are suitable for a wide range of piping and industrial applications, including:
Different flange designs provide different connection characteristics, so the correct product should be selected according to the application rather than simply by size or appearance.
Choosing the correct Carbon Steel Flange requires consideration of several technical factors.
First determine whether the application requires a Blind, Lap Joint, Plate, Slip On, Socket Weld, Threaded, or Weld Neck Flange.
The flange bore and dimensions must correspond with the pipe and connection design.
Select the appropriate pressure class based on the piping system’s design pressure and temperature requirements.
Confirm the required carbon steel material grade and compatibility with the service conditions.
The flange facing should match the mating component and gasket arrangement.
Confirm whether the project requires ASME, EN, DIN, API, or another applicable standard.
The flange, gasket, studs/bolts, nuts, and mating components should be considered as a complete bolted joint rather than as isolated components. ASME’s flange-related guidance also addresses the relationship between flanges, bolts, gaskets, and joints.
LEOCO GLOBAL LTD provides a broad selection of Carbon Steel Flanges for industrial and project-based requirements. Our portfolio covers seven commonly requested flange configurations, from Carbon Steel Blind Flange and Carbon Steel Slip On Flange to Carbon Steel Weld Neck Flange and Carbon Steel Socket Weld Flange.
We support customers with product selection based on flange type, size, pressure class, material, facing, standard, and application requirements. This approach helps procurement teams, contractors, engineers, and distributors identify the flange configuration appropriate for their specific piping requirements.
Whether you require a small quantity for maintenance or a larger supply for an industrial project, LEOCO can support requirements for different Carbon Steel Flange types and specifications.
When requesting a quotation, providing the flange type, nominal size, pressure class, material grade, facing, standard, quantity, and required delivery specification helps ensure the product is correctly identified.
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