Long Radius Elbow

Enhancing Fluid Flow In Piping Systems

In a long radius elbow, the centreline radius is 1.

Long Radius Elbow Boiler Pipeline Protection Corrosion Resistance Industrial Piping +2 More

Long Radius Elbow

Enhancing Fluid Flow In Piping Systems

In a long radius elbow, the centreline radius is 1.5 times the nominal size of the pipe or you can say 1.5 times the diameter of the pipe. Our seamless alloy steel LR elbows ensure durability in high-pressure industrial piping systems.

Long Radius Elbow Boiler Pipeline Protection Corrosion Resistance Industrial Piping +2 More

Long Radius Elbow for Corrosion-Resistant Piping

Long Radius Elbow fittings are essential for industrial piping systems, offering a smooth flow transition with a bending radius of 1.5 times the pipe diameter (R=1.5D). Engineered for corrosion resistance and erosion resistance, our seamless alloy steel LR elbows comply with ASME B16.9 standards, making them ideal for boiler pipeline protection in refineries, petrochemical plants, and power generation facilities.

Manufactured through hot-rolling or cold-drawing, these seamless alloy elbows undergo precise heat treatment to enhance mechanical properties. Their high chromium (4.00-6.00%) and molybdenum (0.45-0.65%) content ensures superior oxidation resistance, creep strength, and durability against abrasive materials, perfect for handling corrosive fluids, gases, and slurries in industrial piping. Available in angles like 90°, 45°, and 22.5°, LR elbows minimize pressure loss, making them suitable for high-pressure and high-flow systems.

Our long radius elbows support welding, bending, and flanging, with recommended preheating (150-200°C) and post-weld heat treatment (650-700°C) to ensure weld integrity. Available in sizes from 1/2” to 24” (DN15 to DN600) and wall thicknesses from SCH 40 to SCH 160, they meet diverse pipeline requirements. Rigorous testing, including tensile, flattening, and hydrostatic tests, ensures compliance with industry standards for temperatures up to 650°C.

Enhanced with coatings like 3LPE or FBE, these elbows provide exceptional corrosion resistance, ideal for oil and gas pipelines, chemical processing, and pneumatic conveying systems. Compared to short-radius elbows, LR elbows offer smoother flow and reduced wear, making them the preferred choice for boiler pipeline protection in high-throughput environments.

For engineers seeking reliable industrial piping solutions, our long radius elbows deliver unmatched strength, safety, and longevity, addressing challenges like pipeline wear, corrosion, and thermal stress.

Comparison of Long Radius Alloy Elbow with Other Fittings
Feature	LR Alloy Elbow	SR Alloy Elbow	Stainless Steel Elbow
Material Type	Ferritic Alloy Steel	Ferritic Alloy Steel	Stainless Steel
Bending Radius	1.5D	1D	1.5D or 1D
Temperature Range	High (up to 650°C)	High (up to 650°C)	High (up to 870°C)
Corrosion Resistance	Excellent (High Cr/Mo)	Excellent (High Cr/Mo)	Superior (Austenitic)
Erosion Resistance	Excellent	Good	Moderate
Applications	Boilers, Petrochemical, Refineries	Tight Spaces, Low Pressure	Food Processing, Marine
Pressure Loss	Low	High	Low to Moderate
Key Advantage	Smooth flow, high-temp corrosion resistance	Compact design	Superior corrosion resistance

Key Benefits

Corrosion Resistance

High chromium content ensures protection against rust and corrosive fluids.

Erosion Resistance

Durable alloy steel withstands wear from abrasive slurries.

Boiler Pipeline Protection

Ideal for high-temperature boiler systems and industrial applications.

Weldability

Supports welding and bending for flexible pipeline configurations.

Cost-Effective

Long lifespan reduces maintenance and replacement costs.

Smooth Flow

1.5D radius ensures minimal pressure loss in high-flow systems.

You Can Also Search Long Radius Elbows by

A curated list of long-tail keywords for long-radius alloy elbows, covering specifications, applications, and material properties.

Standards and Specifications

• ASME B16.9 long radius elbow standards
• Long radius elbow corrosion resistance specs
• Seamless alloy LR elbow ASME B16.9 properties
• Industrial piping LR elbow standards

Applications

• Long radius elbows for boiler pipeline protection
• Seamless LR elbows for petrochemical industry
• Industrial piping LR elbows for oil and gas
• High-temperature LR elbows for power plants
• Corrosion-resistant LR elbows for chemical processing

Material and Grades

• Seamless alloy long radius elbow material
• Corrosion-resistant LR elbow alloy grades
• High-temperature LR elbow properties

Manufacturing and Testing

• Long radius elbow manufacturing process
• LR elbow non-destructive testing
• Corrosion-resistant LR elbow heat treatment
• Industrial piping LR elbow quality testing

Procurement and Suppliers

• Long radius elbow suppliers
• Boiler pipeline protection LR elbow distributors
• Corrosion-resistant LR elbow price

Dimensions and Customization

• Long radius elbow dimensions
• Industrial piping LR elbow tolerances
• Custom seamless LR elbow sizes

Note: ASME B16.9 covers long-radius alloy elbows for high-temperature and corrosion-resistant applications. Contact a certified supplier for detailed specifications.

A long radius elbow (LR elbow) is a pipe fitting with a bending radius of 1.5 times the pipe diameter (R=1.5D), designed for smooth flow in industrial piping. It offers corrosion resistance and is ideal for boiler pipeline protection.

An LR elbow (R=1.5D) provides smoother flow and lower pressure loss compared to a Short Radius (SR) elbow (R=1D). LR elbows are preferred for high-pressure systems and boiler pipeline protection, while SR elbows are used in space-constrained, low-pressure applications.

LR elbows are commonly available in 90°, 45°, and 22.5° angles, with 60° and 120° options for specialized industrial piping systems, ensuring flexibility in flow direction changes.

A 5D elbow has a bending radius five times the pipe diameter, offering minimal flow resistance and erosion resistance for transporting granular materials or powders in industrial piping.

LR elbows are made from: - Alloy Steel: ASTM A234 WP5, WP9, WP11 for boiler pipeline protection.
- Stainless Steel: ASTM A403 WP 304, 316 for corrosion resistance.
- Carbon Steel: ASTM A234 WPB for cost-effective strength.
- Duplex Steel and Nickel Alloys for extreme conditions.

LR elbows are produced via hot-rolling, cold-drawing, or pushing, followed by heat treatments like normalizing or quenching to ensure corrosion resistance and strength for industrial piping.

Quality is ensured through: - Back Arc Thickness: Measured with a thickness gauge to detect thinning (typically 2mm less than the mouth).
- Dimensional Checks: Inner/outer diameters and center height.
- Radiographic Inspection: Detects defects like pores or slag inclusions.
- Testing: Tensile, flattening, and hydrostatic tests per ASME B16.9.

LR elbows (R=1.5D) offer lower pressure loss and smoother flow compared to SR elbows (R=1D), making them ideal for high-pressure systems and boiler pipeline protection. They also reduce wear in abrasive environments.

Coatings include: - Light oiling
- Black painting
- FBE coating
- 2/3-layer PE coating
- Hot-dip galvanizing
These enhance corrosion resistance for boiler pipeline protection.

Calculate the back arc length: L = D * 3.14 (D = pipe diameter). For carbon steel: Weight (kg) = (D * a * 0.02466 * L) / 1000, where a is wall thickness. For stainless steel, use 0.02491. This ensures accurate sizing for industrial piping.

Pipe Fitting Standards & Dimensions

Pipe fitting dimensions are in either metric or Standard English. Common fittings include 90° long radius, 45° elbows, and 180° return bends. LR and SR elbows are widely used in heating and cooling units.

B16.1 – Cast Iron Pipe Flanges and Flanged Fittings
B16.3 – Malleable Iron Threaded Fittings
B16.5 – Pipe Flanges and Flanged Fittings
B16.11 – Forged Steel Fittings, Socket-Welding and Threaded
B16.25 – Buttwelding Ends
B16.36 – Orifice Flanges

ASTM A105 – Carbon Steel Forgings for Piping Applications
ASTM A234 – Piping Fittings of Wrought Carbon Steel & Alloy Steel
ASTM A403 – Wrought Austenitic Stainless Steel Fittings
ASTM A420 – Low-Temperature Service Fittings

AWWA C110 – Ductile-Iron and Gray-Iron Fittings
AWWA C208 – Fabricated Steel Water Pipe Fittings

MSS SP-43 – Wrought Stainless Steel Butt-Welding Fittings
MSS SP-75 – High Test Wrought Buttwelding Fittings
MSS SP-83 – Steel Pipe Unions, Socket-Welding and Threaded
MSS SP-97 – Reinforced Forged Branch Outlet Fittings

BSP – British Standard Pipe (BSPT & BSPP threads)
JIS – Japanese Industrial Standards
NPT – National Pipe Thread (U.S. standard tapered & straight)
ISO – International Organization for Standardization
ANSI – Assigns schedule numbers & wall thickness classification

Codes

Define requirements for design, fabrication, materials, tests, and inspection of piping systems.

Standards

Provide design and construction rules for pipe fittings, adapters, flanges, sleeves, elbows, tees, valves, etc.

Factors Affecting Standards

Pressure-temperature ratings
Size & Dimensions
Design & Tolerances
Materials & Coatings
End connections & Threading
Marking & Pattern taper

Bolts & Nuts for Flanges

A193 – Alloy & stainless steel bolting for high temperature/pressure
A320 – Alloy & stainless bolting for low temperature service
A194 – Standard for nuts in multiple material types
AN – U.S. Army-Navy standard fittings (measured in 1/16″ increments)
Dash Size – Inside diameter reference, e.g., “-8” = AN 8 fitting

Materials & Standards

Common Materials

Carbon Steel	A234 WPB (A & C available)
High Yield Carbon	Enhanced strength properties
Stainless Steel	304, 316 (SCH 10 common)
Nickel Alloys	Specialized applications

Standards & Specifications

ASME B16.9	Factory-Made Wrought Steel
ASME B16.28	Short Radius Elbows
ASME B16.25	Buttwelding Ends
MSS SP-97	Welding End Standards

Plain Bevel and Compound Bevel

Bevel of

Butt Weld Pipe Fitting

All welded pipe fittings have beveled ends to allow for ease of welding. This bevel allows for full penetration weld in most cases.

Welding Bevel acc. to

ASME B16.9, Factory-Made Wrought Steel Buttwelding Fittings
ASME B16.28, Buttwelding Short Radius Elbows and Returns
ANSI/ASME B16.25, Buttwelding Ends
MSS SP-97, Socket Welding, Threaded, and Buttwelding Ends

Butt weld pipe fitting bevels provide reliable, high-strength connections for demanding industrial piping applications.

Wide variety for all areas of application Across DIN, EN, and ASME Standards (For Pipes/Fittings/Flanges)
DIN Standard German Industrial Standard	EN Standard European Norm (CEN)	ASME Standard American Society of Mechanical Engineers
Low-Carbon & Low-Temp Steel • St 35.8 I / III • St 35 N • St 52.0 / 52.4	Low-Carbon & Low-Temp Steel • P235GH-TC1 / TC2 • P215NL / P265NL • P355N / NL1 / NH	Low-Carbon & Low-Temp Steel • WPB (ASTM A234, general use) • WPL3 / WPL6 (ASTM A420, low-temp)
Low-Alloy High-Strength Steel • (No direct grade, referenced to EN)	Low-Alloy High-Strength Steel • L360NB / L360NE (API 5L, pipeline steel)	Low-Alloy High-Strength Steel • WPHY 52 (API 5L, high-pressure transmission)
Molybdenum Steel (High-Temp) • 15 Mo 3	Molybdenum Steel (High-Temp) • 16Mo3 (EN 10028, ≤530°C service)	Molybdenum Steel (High-Temp) • (No direct equivalent; referenced to WP11)
Cr-Mo Steel (Medium Cr Content) • 13 CrMo 4 4 • 10 CrMo 9 10	Cr-Mo Steel (Medium Cr Content) • 13CrMo4-5 (≤540°C service) • 10CrMo9-10 (≤540°C service)	Cr-Mo Steel (Medium Cr Content) • WP5 / WP9 (ASTM A234, 5%/9% Cr) • WP11 / WP22 (ASTM A234, 1.25%/2.25% Cr)
High Cr-Mo-V Steel (Super High-Temp) • (No direct grade, referenced to EN)	High Cr-Mo-V Steel (Super High-Temp) • X10CrMoVNb9-1 (EN 10216-2, ≤600°C service)	High Cr-Mo-V Steel (Super High-Temp) • WP91 / WP92 (ASTM A335, 9% Cr, ≤650°C service)

Key Notes on Grade Equivalence

• Equivalence Logic: Grades are grouped by alloy composition (Cr, Mo, V) and service performance (temp/pressure resistance), not exact "one-to-one" matches—mechanical properties (tensile strength, impact toughness) may vary slightly between standards (e.g., DIN St 35.8 ≈ EN P235GH ≈ ASME WPB, but yield strength differs by ±10 MPa).
• Standard Scope: - DIN/EN grades cover European pipes/fittings (EN 10216 for seamless pipes, EN 10028 for plates); - ASME grades (WP-series) are defined in ASTM A234 (fittings), A335 (pipes), A182 (flanges) for American systems.
• Application Considerations: For cross-standard projects (e.g., European equipment with American pipes), verify maximum service temperature (e.g., EN 16Mo3 ≈ ASTM WP11, but 16Mo3 is limited to 530°C vs. WP11 to 593°C) and corrosion resistance (e.g., L360NB for oil pipelines vs. WPHY 52 for offshore transmission) to avoid mismatches.
• Unmatched Grades: Some grades (e.g., DIN 15 Mo 3) have no direct ASME equivalent—use "reference grades" (e.g., WP11) and consult material test reports (MTRs) to confirm compliance with project requirements.

Long Radius Elbow

Long Radius Elbow

Long Radius Elbow for Corrosion-Resistant Piping