Baode Pipe Fittings supplies large diameter long radius elbows for industrial piping systems where pipe size, wall thickness, center-to-end dimensions and material grade must match project specifications. Available in carbon steel, stainless steel and alloy steel, these fittings are specified by nominal pipe size, outside diameter, wall thickness, bend angle, applicable standards and inspection requirements.
For large-diameter piping, a directional component involves critical dimensional control at the pipe ends, forming consistency through the bend, wall-thickness maintenance and weld-end preparation to ensure proper fit-up and site installation.
Product Specifications & Standard Dimensions
|
Parameter |
Specification |
|
Product |
Large Diameter Long Radius Elbow |
|
Connection Type |
Butt Welding |
|
Bend Angles |
45° / 90° (Custom angles available via approved drawing) |
|
Size Range |
Up to NPS 48 / DN 1200 per ASME B16.9 |
|
Materials |
Carbon Steel / Stainless Steel / Alloy Steel |
|
Manufacturing Standard |
ASME B16.9 |
|
Carbon & Alloy Standards |
ASTM A234 / ASTM A234M |
|
Stainless Steel Standards |
ASTM A403 / ASTM A403M |
|
Wall Thickness |
Standard schedule or specified nominal/minimum thickness |
|
End Preparation |
ASME B16.25 or project specification |
|
Inspection Scope |
Dimensional inspection, visual verification, and project-specific NDE |
|
Documentation |
MTC, inspection reports, and traceability records |
Standard Center-to-End Dimensions
|
Nominal Pipe Size (NPS) |
Outside Diameter (mm) |
90° Center-to-End Dimension (mm) |
|
NPS 24 |
610.0 |
914 |
|
NPS 30 |
762.0 |
1,143 |
|
NPS 36 |
914.0 |
1,372 |
|
NPS 42 |
1,067.0 |
1,600 |
|
NPS 48 |
1,219.0 |
1,829 |
Application Industries
Oil & Gas Transmission
Widely utilized in high-volume crude oil, refined product trunk lines, and natural gas gathering stations where smooth flow transition is vital.
Power Generation
Deployed in cooling water loops, steam condensate lines, and flue gas desulfurization (FGD) systems within thermal and nuclear power plants.
Chemical & Petrochemical
Integral to large-scale processing units, refinery off-site utilities, and extensive liquid chemical transfer networks handling aggressive media.
Water Treatment & Desalination
Applied in massive intake and discharge pipelines, municipal water supply mains, and high-capacity desalination facility headers.
Material Classifications and Technical Standards
Carbon Steel
Selected for standard process piping, high-volume industrial utilities, and fluid transmission systems. Typical material specifications adhere to ASTM A234 WPB or equivalent carbon steel grades based on project service parameters.
Alloy Steel
Deployed when piping circuits require elevated operating temperatures or specific mechanical and metallurgical properties. Common grades include WP5, WP9, WP11, and WP22, governed by ASTM A234/A234M for pressure piping and pressure-vessel applications.
Stainless Steel
Specified for corrosive environments, process cleanliness, or specific thermal conditions. Material procurement follows ASTM A403/A403M using austenitic grades such as WP304, WP304L, WP316, and WP316L, incorporating specified heat-treatment requirements.
Manufacturing Process and Technical Controls
Material Control
Incoming plate or pipe stock is verified against mill test certificates, recording heat numbers to maintain traceability through cutting and forming.
01
Forming Control
Forming parameters are managed to maintain uniform cross-sections and prevent excessive thinning along the curved section of the bend.
02
Heat Treatment
Thermal processing is applied according to the material specification, grade, and thickness to restore mechanical properties following forming.
03
End Preparation
Welding ends are machined to ensure root opening alignment and uniform wall transition matching the mating pipe.
04
Dimensional Inspection
Verification checks focus on ovality, wall thickness, bevel angle, and center-to-end accuracy to eliminate field fit-up difficulties.
05
Engineering & Geometry Control for Large Diameters
Large-bore fittings possess significantly greater physical sections and forming areas than conventional small-bore components. Consequently, manufacturing focus shifts from basic angle formation to total geometry control.
Procurement and technical evaluation must account for:
Outside diameter at the bevel face
Nominal and minimum wall thickness (especially along the extrados)
Center-to-end dimension tolerances
Bend angle precision and squareness
End ovality limits to match mating pipe inner diameters
Bevel geometry consistency for root opening alignment
Bevel geometry consistency for root opening alignment
End Protectors
Heavy-duty plastic caps or wooden bevel protectors are securely fitted to all weld ends to prevent mechanical damage, impact, and contamination during transit.
Bundling and Palletizing
Large-diameter elbows are stably mounted on custom-built fumigated wooden pallets or heavy-duty skids, secured with high-tensile steel strapping.
Corrosion Prevention
Exterior surfaces are coated with a temporary anti-rust varnish or specialized protective oil, with optional waterproof wrapping for ocean freight.
Clear Identification
Weatherproof metal tags and durable exterior markings display nominal size, wall thickness, material grade, heat number, and order reference for easy yard sorting.
FAQ
Q: What is a large diameter long radius elbow?
A: It is a factory-made butt-welding fitting designed to alter fluid direction in large-bore piping systems while utilizing an expanded bend radius to minimize flow resistance.
Q: What size range is covered under standard manufacturing?
A: ASME B16.9 covers wrought butt-welding fittings up to NPS 48. Sizes outside this standard require project-specific engineering drawings.
Q: Why is wall thickness specification critical for large-diameter fittings?
A: Nominal pipe size alone does not determine internal pressure capacity. Specifying the exact schedule or minimum wall thickness ensures structural integrity under design pressure.
Q: What documentation is supplied with the shipment?
A: Shipments include Material Test Certificates (MTC), dimensional inspection reports, and any project-specified NDE or positive material identification (PMI) documentation.
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