Pipe and piping fittings
Long-radius 90-degree elbow
Changing line direction with a defined angle and radius
Specialist selection guide
What should be reviewed before selecting this product?
A long-radius 90-degree elbow changes line direction with a centreline radius of approximately 1.5 times nominal pipe size. Radius, schedule, outside diameter, end wall and material must match the pipe and piping class.
Technical selection path
- 1
Define nominal size and pipe schedule
- 2
Check long-radius geometry and installation space against the line model
- 3
Match material grade, end wall and weld bevel
- 4
Review corrosion, erosion and coating requirements
- 5
State material certification and examination requirements
Key strengths
- Lower pressure loss than a short-radius elbow
- Smoother stress and flow distribution
- Broad availability in common schedules and grades
Selection limitations
- Requires more installation space
- The outer bend is vulnerable in abrasive flow
- Substitution without checking end wall is unsafe
Typical applications
Where can this option be considered?
- Process-line direction changes
- Steam, water and hydrocarbon lines
- Piping where pressure loss matters
Reference standards
A standard does not replace the project specification
Common technical questions
Concise answers before enquiry
How do long- and short-radius elbows differ?
The long-radius centreline radius is commonly 1.5D and the short-radius version 1D, producing different space, pressure-loss and stress characteristics.
Must the elbow schedule match the pipe?
The fitting must match the design through actual end wall, tolerance, bevel and strength; a matching schedule label alone is not sufficient.
Process, transmission and utility piping layouts
Radius, wall, thinning, corrosion allowance and local stress
Initial review sheet
Technical attributes to review
Final values must come from project specifications, calculations and manufacturer data. This table defines the information scope.
FamilyButt-weld fittings
Main groupPipe and piping fittings
Materials to evaluateCarbon steel, Stainless steel, Alloy steel, Nickel alloy
Connections to evaluateButt-weld
Typical mediaProcess, Steam, Gas, Liquid
Relevant industriesOil and gas, Refining, Petrochemical, Power generation, Water and utilities
Reference standardsASME B16.9 · ASME B16.28 · MSS SP-75
Enquiry checklist
Include this information with your request
Size and schedule
Radius and angle
Reduction type
Material grade
Dimensional tolerance
Testing and certification
Before substitution
A matching name does not guarantee interchangeability
Installation dimensions, pressure rating, wetted materials, sealing design, construction standard, testing and documentation must be checked independently.
Adjacent types
Other options in this family
Final technical approval is required
This page is educational and intended for initial screening. Final selection must be approved against project requirements, actual service conditions and manufacturer documentation.
Send request for review