Standard
ASME B16.9, MSS SP-75
Size Range
½" – 24" seamless; 4" – 72" welded
Category
Fittings
Concentric and eccentric butt-weld reducers in carbon, alloy, and stainless steel manufactured to ASME B16.9. Concentric reducers maintain a common centreline; eccentric reducers keep one side flat for draining or maintaining top-of-pipe alignment. Available from ½" through 24" seamless and 4" through 72" welded; wall thickness from Sch 10 through XXS, maximum 120 mm.
Applications
- → Process piping diameter transitions — concentric reducers for inline flow reductions
- → Pump suction piping — eccentric reducers (flat side up) to prevent vapour pocketing
- → Pipeline pig traps — eccentric reducers (flat side down) for full drainability
- → Compressor inlet/outlet nozzles — concentric reducers to match equipment flange size
- → Production separator inlet piping — large welded reducers for header connections
- → Offshore riser and flowline transitions — alloy and stainless for corrosive service
- → District heating distribution — large welded reducers for header branch connections
Standards & Certifications
- ASME B16.9 — Factory-made wrought buttwelding fittings — dimensional standard
- MSS SP-75 — High-strength buttwelding fittings for WPHY pipeline grades
- 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
Materials
| Material Category | ASTM / ASME Grades |
|---|---|
| Carbon steel | ASTM A234 WPB, WPC |
| Alloy steel | ASTM A234 WP1, WP12, WP11, WP22, WP5, WP91, WP911 |
| Stainless steel | ASTM A403 WP304/304L/304H, WP316/316L/316H, WP321/321H, WP347/347H |
| Low-temperature steel | ASTM A402 WPL 3, WPL 6 |
| High-performance | ASTM A860 WPHY 42, 46, 52, 60, 65, 70 |
Supply Enquiry — Pipe Reducer
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