Standard
ASME B16.9, DL/T 515
Size Range
OD up to 1220 mm; bend radius R = 3D – 10D
Category
Fittings
Hot-induction and cold-formed pipe bends in carbon, alloy, and stainless steel with bend radius R from 3D to 10D. Unlike standard ASME B16.9 short- and long-radius elbows, pipe bends are produced with extended straight tangent lengths (300–1500 mm) and are specified by angle (15° through 180°) and bend radius to suit pipeline routing requirements. Available to ASME B16.9, DL/T 515, SY 5257, or customer drawing.
Applications
- → Onshore pipeline routing — long-radius bends for direction changes with minimal pressure drop and smooth pigging passage
- → River and road crossings — custom R and angle to match survey and as-built profiles
- → Subsea pipeline shore approaches — hot-induction bends to follow seabed contours
- → Offshore platform and FPSO deck piping — large-radius bends where space permits
- → Compressor and pump skid piping — large-radius bends to reduce vibration-induced fatigue
- → Power plant main steam and feedwater lines — alloy steel bends for elevated temperature
- → Gas transmission pipeline facilities — bends to DL/T 515 or SY 5257 for Chinese domestic projects
Standards & Certifications
- ASME B16.9 — Wrought buttwelding fittings — applies where bend radius is within B16.9 scope
- DL/T 515 — Chinese power industry standard for hot-induction bends on power plant piping
- SY 5257 — Chinese petroleum industry standard for pipeline hot-induction bends
- ASTM A234 — Wrought carbon and alloy steel fittings — WPB, WP11, WP22, WP91
- ASTM A403 — Wrought austenitic stainless steel fittings — 304, 316, 321 series
- EN 10204 3.1 — Mill test certificate for material traceability
Materials
| Material Category | ASTM / ASME Grades |
|---|---|
| Carbon steel | ASTM A234 WPB; API 5L Grade B, X42, X52, X60, X65, X70 |
| Alloy steel | ASTM A234 WP1, WP11, WP22, WP91 |
| Stainless steel | ASTM A403 WP304/304L, WP316/316L, WP321 |
Supply Enquiry — Pipe Bend
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