When selecting flanged elbows, how should LR and SR be chosen?
The process supervisor prioritizes LR long radius (R=1.5D); SR short radius (R=1.0D) is used only for localized positions with space constraints and requires design review.
Flange elbow
Purpose: To achieve medium flow reversal in pipelines, with flange bolt and gasket connections, making disassembly, isolation, and maintenance convenient; Applicable conditions: medium and high pressure pipelines, equipment inlet and outlet
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- Integral Flange Elbow
- No On-Site Flange Welding Required
- Easy Bolt-On Assembly and Maintenance
- Dual curvature, multiple flange types, multiple sealing faces, all pressure ratings available
- Multi-Material Coverage
Detailed Introduction
The flange elbow integrates the elbow and flange into one piece, eliminating the need for on-site flange welding. It achieves a sealed connection through bolts and gaskets, making disassembly, installation, and maintenance very convenient. The product supports two curvature types: long radius (LR, R=1.5D) and short radius (SR, R=1.0D). The angles cover 45°, 90°, and 180°, with 30° and 60° available on a custom basis. Flange types include PL, SO, WN, and IF. Sealing face types include RF, MFM, TG, RJ, and others. Pressure ratings and materials are diverse, meeting the requirements of medium and high pressure piping systems. It complies with standards such as GB/T9113, GB/T12459, ASME B16.5, and ASME B16.9. Standard specifications are readily available in stock, and non-standard customization such as reducing, thickened wall, and thermal insulation/anti-corrosion options is supported. The product is widely used in industries such as petrochemical, power and thermal, coal chemical, new energy, municipal fire protection, and wastewater treatment. It is suitable for scenarios such as equipment inlet and outlet connections, pump and valve piping connections, and pipe rack maintenance access points. We provide technical guidance for product selection and can supply complete documentation for materials, inspection, and export according to project requirements.
- Integrally formed, no on-site flange welding required, saving installation time
- Bolted connection, convenient disassembly, installation, and maintenance, easy for isolation and servicing
- Supports LR/SR dual curvature, 45°/90°/180° in stock, 30°/60° available on a custom basis
- Multiple flange types (PL/SO/WN/IF) and sealing faces (RF/MFM/TG/RJ) available
- Multiple materials and pressure ratings covered, compliant with Chinese national standards and American standards
- Standard specifications readily available in stock, supports non-standard customization and export packaging
| Product Name | Flanged Elbow |
| Product Category | Curvature: LR long radius (R=1.5D), SR short radius (R=1.0D) / Angles: 45°, 90°, 180° / 30° and 60° require customization / Flange types: PL/SO/WN/IF / Sealing faces: RF/MFM/TG/RJ / Multiple materials and pressure ratings available / Supports non-standard customization for reducing, thickened wall, and thermal insulation/anti-corrosion. |
| Core parameters include bending angle, curvature LR long radius R | 1.5D / SR short radius R:1.0D), flange type, sealing face form, pressure rating (PN/Class), nominal diameter DN, material grade; implemented in accordance with GB/T9113, GB/T12459, ASME B16.5, ASME B16.9 standards. Flange outer diameter, bolt hole center distance, bolt hole diameter, and flange thickness are key assembly dimensions that directly determine whether matching installation with equipment and valve flanges is possible. 30° and 60° non-standard angles need to be based on customer drawings; all parameters shall be comprehensively confirmed in combination with medium, temperature, and pressure working conditions. |
| Customization Capability | Customizable: LR/SR dual curvature, 30°/60° non-standard angles; multiple flange forms, multiple sealing faces, full pressure ratings; supports reducing, thickened high-pressure, plastic-lined, and prefabricated insulated structures; supports drawing-based and sample-based processing, implemented in accordance with national standards, American ASME B16.5/B16.9 standards, European standards, and project-specific technical conditions; supports full inspection, heat treatment, and surface anti-corrosion treatment; special angles and large-diameter alloy parts require process evaluation, suitable for domestic engineering and foreign trade custom orders. |
| MOQ | MOQ: standard stock specifications start from 1 piece; large-diameter/thick-wall/alloy steel/non-standard custom parts: minimum production order quantity applies; supports LCL mixed loading, suitable for domestic engineering and foreign trade export orders. |
| Lead Time | Standard stock angles: 1-3 working days; small and medium diameter ordinary non-standard: 7-15 working days; large-diameter/alloy steel/30° and 60° non-standard with special processes: 15-30 working days; foreign trade requires reserving packing and customs clearance time, delivery date is subject to the contract. |
| Packaging | Small diameter: rust-proof paper wraps the welded bevel, plywood wooden case with anti-vibration cushion blocks for fixing; medium and large diameter: solid wood pallet loading, wrapped externally with rain-proof stretch film and woven fabric for protection; export packaging: printed product shipping marks, built-in desiccant, wooden case supports fumigation, suitable for land transport and sea transport. |
| Reference Price | Inquire |
Applications
- Medium and high pressure pipeline systems in petroleum, chemical, electric power, and thermal energy industrial and mining enterprises, used for equipment inlet/outlet and pump/valve connections
- Pipe rack maintenance nodes, occasions requiring frequent disassembly, isolation, and maintenance
- For new installations or pipeline renovation projects, requiring quick connection and easy maintenance
- For space-constrained local positions, selecting SR short-radius flange elbows saves space
- For foreign trade export projects, requiring compliance with ASME standards and provision of export packaging and documentation
Overview
A flange elbow is a pipe connection fitting formed by integrating the elbow and flange into one piece. It eliminates the need for on-site flange welding, achieving a sealed connection through bolts and gaskets, and is convenient for disassembly, installation, inspection and maintenance. The product supports LR/SR dual curvature, multiple flange types, multiple sealing face forms, and multiple material options. It is suitable for medium and high pressure pipeline systems and complies with both national standards (GB) and American standards (ASME). Standard specifications are available in ample stock, and non-standard customization is supported. It is applicable to domestic engineering projects and foreign trade exports.
Key Selling Points
The integrated one-piece forming design eliminates the on-site flange welding process, improving installation efficiency; the bolted connection method makes disassembly, installation, inspection and maintenance convenient, and facilitates pipeline isolation and maintenance. Both long-radius and short-radius curvatures are supported to meet different space requirements; flange types and sealing face forms are diverse, and pressure ratings and materials can be flexibly selected to suit various working conditions. It complies with national standards (GB) and American standards (ASME). Standard specifications are available in ample stock for rapid delivery; non-standard customization such as reducing sizes, thickened walls, thermal insulation and anti-corrosion treatment is also supported to meet special project requirements.
Applications
Flange elbows are applicable to medium and high pressure pipeline systems in industries such as petrochemical, electric power and thermal energy, coal chemical, new energy, municipal fire protection, and wastewater treatment. Common application scenarios include equipment inlet and outlet connections, pump and valve nozzle connections, pipe rack inspection and maintenance nodes, new installations, and pipeline renovation projects. LR long-radius elbows are mostly used for main process pipelines, while SR short-radius elbows are suitable for space-constrained local positions.
Specifications
The core parameters of flange elbows include bending angle, curvature (LR long radius R=1.5D / SR short radius R=1.0D), flange type, sealing face form, pressure rating (PN/Class), nominal diameter DN, and material grade. Applicable standards include GB/T9113, GB/T12459, ASME B16.5, and ASME B16.9. Flange outer diameter, bolt hole center distance, bolt hole diameter, and flange thickness are the key assembly dimensions that directly determine whether the elbow can be paired and installed with equipment and valve flanges. Non-standard angles of 30° and 60° need to be based on customer drawings, and all parameters must be comprehensively confirmed in conjunction with the medium, temperature, and pressure working conditions. For specific specifications and parameters, please contact us for confirmation.
Procurement & Delivery
For standard stocked angles (45°/90°/180°), the delivery time is 1-3 working days; for small and medium diameter ordinary non-standard parts, the delivery time is 7-15 working days; for large diameter, alloy steel, and 30°/60° non-standard parts with special processes, the delivery time is 15-30 working days. Foreign trade orders require additional time for container loading and customs declaration, and the specific delivery time is subject to the contract. Regarding MOQ, standard stocked specifications have a minimum order quantity of 1 piece, while large diameter, thick wall, alloy steel, and non-standard customized parts have minimum production order quantities, and mixed container loading is supported. Regarding packaging, small diameters use rust-proof paper to wrap the welding bevel, with plywood wooden cases and anti-vibration cushion blocks for fixation; medium and large diameters use solid wood pallets for load bearing, wrapped with rain-proof stretch film and woven fabric for protection; export packaging is printed with product shipping marks, contains desiccant inside, and the wooden cases support fumigation, suitable for land transport and sea freight.
Service & Support
We provide selection technical guidance, helping to distinguish between BW butt-welding and SW socket-welding selection, and provide complete documentation for materials, inspection, and export. For non-human-caused body quality issues, we handle them according to contract terms. We track logistics progress, and for foreign trade orders we assist in checking the packing list and shipping marks. We also provide technical Q&A, answering questions about storage and usage, but do not assume responsibility for quality issues caused by welding, modification, or incorrect selection.
FAQ
Which standards do flanged elbows comply with?
They comply with GB/T12459, GB/T9113, ASME B16.5, ASME B16.9, and other standards. Non-standard items can be produced according to drawings, and various non-destructive testing methods are supported.
What is the lead time for flanged elbows?
45°/90°/180° are standard stock items with a delivery time of 1-3 working days; 30°/60° are customized items, and the delivery time requires process evaluation, generally 15-30 working days.
Can flanged elbows be customized?
Yes, it is possible. We support customization for LR/SR double curvature, 30°/60° non-standard angles, reducing diameters, thickened high-pressure, plastic-lined, pre-insulated, etc. Processing can be done according to drawings or samples, and we implement national standards, American standards, or project-specific technical conditions.
What is the minimum order quantity for flanged elbows?
Standard stock specifications have a minimum order of 1 piece, while large-diameter, thick-wall, alloy steel, and non-standard custom parts have a minimum production order quantity, and mixed container loading is supported.
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