Pipe Elbow (ASME B16.9)
Factory-made buttweld elbows to ASME B16.9 in 45°, 90°, and 180° configurations. Long radius (LR) and short radius (SR) available in all standard schedules from NPS ½" to 48".
Specifications
| Parameter | LR Elbow | SR Elbow |
|---|---|---|
| Standard | ASME B16.9 | |
| Angles | 45°, 90°, 180° | 90° |
| Centerline radius | 1.5 × NPS (1.5D) | 1.0 × NPS (1.0D) |
| Size range | NPS ½" to 48" | |
| Wall thickness | Per ASME B36.10M schedule (SCH 10–XXS) | |
| End preparation | Beveled per ASME B16.25 | |
| Marking | Material grade, heat number, schedule, standard | |
Materials
Carbon Steel
A234 WPB, WPC — standard process piping, up to 425°C (800°F)
Stainless Steel
A403 WP304/304L, WP316/316L, WP321 — corrosion-resistant service
Alloy Steel
A234 WP11, WP22, WP5, WP91 — high-temperature/creep service
Duplex / Super Duplex
F51 (SAF 2205), F53 (SAF 2507) — offshore, chemical, high-chloride
Applications
- →Process piping direction changes in refineries, petrochemical plants, and power stations
- →High-pressure steam and condensate systems (SCH 80+, alloy grades)
- →Offshore oil & gas topsides and subsea jumpers (duplex/super duplex)
- →Chemical plant acid and corrosive media service (stainless, Hastelloy)
Calculate Pipe Elbow Weight
Free ASME B16.9 elbow weight calculator — select angle, radius, NPS, schedule, and material.
FAQ
What is the difference between long radius and short radius elbows?
Long radius (LR) elbows have a centerline radius equal to 1.5× the nominal pipe size (1.5D). Short radius (SR) elbows have a centerline radius equal to 1.0× the nominal pipe size (1D). LR elbows are preferred for most process piping because they have lower pressure drop and stress concentration. SR elbows are used where space is restricted.
How heavy is a 6" SCH 40 90° LR elbow?
A 6" SCH 40 (7.11 mm wall) 90° LR elbow in carbon steel (A234 WPB) weighs approximately 7–8 kg. Use our elbow weight calculator for exact values based on your material and schedule.
What materials are buttweld elbows available in?
ASME B16.9 elbows are available in carbon steel (A234 WPB, WPC), stainless steel (A403 WP304, WP316), alloy steel (A234 WP11, WP22, WP91), and duplex/super duplex grades. Material selection depends on operating temperature, pressure, and process fluid compatibility.