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Butt-Weld Fittings

Concentric Reducer

Seamless concentric reducer, DN50×40 to DN2000, smooth conical transition.

Austenitic stainlessDuplexNickel alloys
Size rangeDN50×40 to DN2000×DN1800
TypeConcentric
Wall thicknessSch5S–XXS, each end matched to its pipe
StandardsASME B16.9, GB/T 12459-2017, GB/T 13401-2017, SH/T 3408, DIN 2616
EndsButt weld, ASME B16.25 bevel
TestingDimensional, PMI, RT/UT and hydrostatic on request

Overview

A concentric reducer brings two pipe sizes onto the same centreline with a conical transition that keeps the flow symmetrical. It is the default reducer wherever gas or clean liquid is running and no liquid pocket or gas trap has to be avoided.

Forming

Cold or hot stamped from seamless tube, with the cone angle controlled so the boundary layer does not separate at high flow.

Lengths follow ASME B16.9 for the matching size pair; non-standard lengths to drawing.

Ends

Both ends bevelled to ASME B16.25 and machined to the ordered schedules — the two schedules may differ.

Marked as large end × small end, e.g. DN100 × DN80 or 4 in × 3 in.

Materials

  • Austenitic stainless (304/316L, 321, 310S, 904L)
  • Duplex (2205, 2507)
  • Nickel alloys (625, C-276, 800H/HT)
  • Carbon steel (A234 WPB)

Applications

Pump discharge and suction linesHeader size transitionsGas and clean-liquid pipingSeawater systems
Every shipment can be supplied with an EN 10204 3.1 mill certificate, dimensional report and PMI report. Third-party inspection at SGS, BV or TUV can be arranged on request.
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Send the line list. Get a quotation with the material, standard and lead time.

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