Ss304 Concentric Reducer

QS Pipe Fitting: Yancheng SS304 Concentric Reducer

SS 304 concentric reducer with STD wall and butt weld ends to ASME B16.9, for corrosion-resistant diameter transitions in petroleum lines.

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One-Minute Overview

Concentric reducer in SS 304 for coaxial diameter transitions.
57*45*3 mm, STD wall, butt weld ends, to ASME B16.9.
Corrosion resistance feature for petroleum pipeline service.
Sizes, schedules and certificates are confirmed per inquiry.

A concentric reducer joins a larger pipe to a smaller one on a shared centreline, so the bore stays coaxial and the flow changes diameter without a step to one side. This SS 304 version is the 57*45*3 mm size with STD wall and butt weld ends, built to ASME B16.9 so the dimensions, the wall and the end preparation match the pipes it joins. Stainless SS 304 brings corrosion resistance for petroleum pipeline duty, where weather, process media and condensation all work on the wall. The coaxial shape keeps flow turbulence and pressure drop low, which is why it is the usual choice on vertical runs and pump spools. Sizes, wall thicknesses and schedules are confirmed per inquiry, and a detailed specification sheet is available on request.

Name: SS 304 Concentric Reducer
Material: SS 304
Type: Concentric
Standard: ASME B16.9
End: Butt Weld
Thickness: STD
Size: 57*45*3 mm
Feature: Corrosion Resistance
Usage: Petroleum Pipeline
Sizes, wall thicknesses and schedules are confirmed per inquiry, and a detailed specification sheet is available on request.

A concentric reducer keeps the large and small bores on the same axis, which is why it suits vertical runs and pump spools where a pocket of liquid or gas would cause trouble. Where a horizontal line has to stay flat on one side to avoid a vapour trap, an eccentric reducer is the better shape, so settle that choice before ordering. On this SS 304 part the 57*45*3 mm size, STD wall and butt weld ends are fixed to ASME B16.9, so check the actual outside diameters and the wall of both connecting pipes against the spool drawing. Keep the reducer in a compatible material group with the run pipe, and note that diameters in inches are often how the line is specified even when the drawing is metric.

Welding a reducer is two joints with different bores, so fit-up needs a little patience. Align the large end first, tack, then bring the small end square and check the overall length before the root pass, because a tapered body can drift out of line as it heats. Cap with controlled heat input, let the weld cool evenly and do not use the reducer as a lever to pull a misaligned spool into place. Inspect both beads, confirm the grade stamping and keep the bevels protected until the fitter is ready. Sizes, wall thicknesses and schedules are confirmed per inquiry, so request the specification sheet and the material certificate with the order.

FAQ

Q1. When is a concentric reducer the wrong shape?

On a horizontal line that must keep one side flat, usually to stop a vapour pocket before a pump or to drain a line completely. A concentric reducer shifts the centreline, so the flat side is lost and gas or liquid can collect. In that case an eccentric reducer, installed flat side up or down as the service needs, is the right part.

Q2. Does SS 304 mean I can ignore the coating?

It means better corrosion resistance, not immunity. SS 304 handles weather and many process media well, which is why it is specified on petroleum lines, but chloride exposure, stagnant pockets and welding heat still need attention. Pick the grade for the actual medium and keep the weld clean, rather than treating stainless as a free pass.

Q3. Can I pull two misaligned pipes together with the reducer?

That is a good way to buy a cracked weld. A reducer is a transition, not a come-along; forcing it to close a bad fit leaves residual stress right where the taper already concentrates load. Align the spool properly, tack without strain and let the fitting join two pipes that already meet square.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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